Company Quick10K Filing
Ambac
Market
Closing Price ($) Shares Out (MM) Market Cap ($MM)
$0.00 46 $763
Financial Filings
10-Q 2019-11-07 Quarter: 2019-09-30
10-Q 2019-08-08 Quarter: 2019-06-30
10-Q 2019-05-09 Quarter: 2019-03-31
10-K 2019-02-28 Annual: 2018-12-31
10-Q 2018-11-07 Quarter: 2018-09-30
10-Q 2018-08-08 Quarter: 2018-06-30
10-Q 2018-05-09 Quarter: 2018-03-31
10-K 2018-02-28 Annual: 2017-12-31
10-Q 2017-11-08 Quarter: 2017-09-30
10-Q 2017-08-09 Quarter: 2017-06-30
10-Q 2017-05-10 Quarter: 2017-03-31
10-K 2017-02-28 Annual: 2016-12-31
10-Q 2016-11-03 Quarter: 2016-09-30
10-Q 2016-08-09 Quarter: 2016-06-30
10-Q 2016-05-11 Quarter: 2016-03-31
10-K 2016-02-29 Annual: 2015-12-31
10-Q 2015-11-09 Quarter: 2015-09-30
10-Q 2015-08-10 Quarter: 2015-06-30
10-Q 2015-05-11 Quarter: 2015-03-31
10-K 2015-03-02 Annual: 2014-12-31
10-Q 2014-11-10 Quarter: 2014-09-30
10-Q 2014-08-11 Quarter: 2014-06-30
10-Q 2014-05-12 Quarter: 2014-03-31
10-K 2014-03-03 Annual: 2013-12-31
10-Q 2013-11-14 Quarter: 2013-09-30
10-Q 2013-08-14 Quarter: 2013-06-30
10-Q 2013-05-15 Quarter: 2013-03-31
10-Q 2012-11-14 Quarter: 2012-09-30
10-Q 2012-08-09 Quarter: 2012-06-30
10-Q 2012-05-10 Quarter: 2012-03-31
10-K 2012-03-22 Annual: 2011-12-31
10-Q 2011-11-09 Quarter: 2011-09-30
10-Q 2011-08-09 Quarter: 2011-06-30
10-Q 2011-05-10 Quarter: 2011-03-31
10-K 2011-03-16 Annual: 2010-12-31
10-Q 2010-11-15 Quarter: 2010-09-30
10-Q 2010-08-09 Quarter: 2010-06-30
10-Q 2010-05-17 Quarter: 2010-03-31
10-K 2010-04-09 Annual: 2009-12-31
Current Reports
8-K 2019-11-07 Earnings, Exhibits
8-K 2019-08-08 Earnings, Exhibits
8-K 2019-06-03 Shareholder Vote
8-K 2019-05-09 Earnings, Exhibits
8-K 2019-02-28 Earnings, Exhibits
8-K 2018-11-07 Earnings, Exhibits
8-K 2018-10-11 Other Events
8-K 2018-08-30 Regulation FD, Exhibits
8-K 2018-08-08 Earnings, Exhibits
8-K 2018-08-03 Regulation FD, Exhibits
8-K 2018-07-25 Earnings, Regulation FD, Exhibits
8-K 2018-07-16 Regulation FD
8-K 2018-07-03 Regulation FD, Exhibits
8-K 2018-06-22 Enter Agreement, Regulation FD, Exhibits
8-K 2018-05-18 Shareholder Vote
8-K 2018-05-08 Earnings, Exhibits
8-K 2018-02-28 Earnings, Exhibits
8-K 2018-02-12 Enter Agreement, Off-BS Arrangement, Regulation FD, Exhibits
8-K 2018-02-02 Earnings, Regulation FD, Exhibits
8-K 2018-01-11 Regulation FD, Exhibits
AMBC 2019-09-30
Content
Part I. Financial Information
Item 1. Unaudited Financial Statements of Ambac Financial Group, Inc. and Subsidiaries
Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations
Item 3. Quantitative and Qualitative Disclosures About Market Risk
Item 4. Controls and Procedures.
Part II. Other Information
Item 1. Legal Proceedings
Item 1A. Risk Factors
Item 2. Unregistered Sales of Equity Securities and Use of Proceeds
Item 3. Defaults Upon Senior Securities - No Matters Require Disclosure.
Item 5. Other Information - No Matters Require Disclosure.
Item 6. Exhibits
Exhibits
EX-31.1 a02-019ambcex311x3q191.htm
EX-31.2 a02-019ambcex312x3q191.htm
EX-32.1 a02-019ambcex32x1x3q19.htm

Ambac Earnings 2019-09-30

AMBC 10Q Quarterly Report

Balance SheetIncome StatementCash Flow
Comparables ($MM TTM)
Ticker M Cap Assets Liab Rev G Profit Net Inc EBITDA EV G Margin EV/EBITDA ROA
UVE 996 2,064 1,498 893 0 111 147 822 0% 5.6 5%
TPRE 973 3,489 2,094 763 0 -50 -39 223 0% -5.8 -1%
MBI 781 8,647 7,594 157 0 -211 -2 303 0% -151.6 -2%
AMBC 763 14,713 13,160 189 0 -192 -162 3,664 0% -22.6 -1%
EMCI 694 1,788 1,158 722 0 32 38 693 0% 18.5 2%
UIHC 597 2,704 2,141 776 0 -16 6 397 0% 63.5 -1%
HRTG 446 1,934 1,495 491 0 18 65 308 0% 4.8 1%
HCI 436 752 566 234 0 15 28 392 0% 14.2 2%
GBLI 408 2,015 1,321 538 0 -35 -20 652 0% -33.4 -2%
NODK 408 538 241 250 91 41 53 348 36% 6.6 8%
Document
000000000000000000000false--12-31Q3201900008745010849480000.010.011300000001300000004536517045571743453362785900002032-12-312029-12-310000400008200015000500000000625000121100077700068270003510490004181400000.010.01200000002000000000002889220483 0000874501 2019-01-01 2019-09-30 0000874501 2019-11-04 0000874501 2013-04-30 0000874501 2018-12-31 0000874501 us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0000874501 2019-09-30 0000874501 us-gaap:FixedIncomeSecuritiesMember 2018-12-31 0000874501 us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-09-30 0000874501 us-gaap:CollateralPledgedMember us-gaap:FixedIncomeSecuritiesMember 2019-09-30 0000874501 us-gaap:CollateralPledgedMember us-gaap:FixedIncomeSecuritiesMember 2018-12-31 0000874501 us-gaap:FixedIncomeSecuritiesMember 2019-09-30 0000874501 ambc:EquityinvestmentsinpooledfundsMember 2019-09-30 0000874501 us-gaap:ShortTermInvestmentsMember 2019-09-30 0000874501 ambc:EquityinvestmentsinpooledfundsMember 2018-12-31 0000874501 us-gaap:ShortTermInvestmentsMember 2018-12-31 0000874501 2018-01-01 2018-09-30 0000874501 2018-07-01 2018-09-30 0000874501 2019-07-01 2019-09-30 0000874501 us-gaap:TreasuryStockMember 2018-07-01 2018-09-30 0000874501 us-gaap:NoncontrollingInterestMember 2018-07-01 2018-09-30 0000874501 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2019-09-30 0000874501 us-gaap:TreasuryStockMember 2019-07-01 2019-09-30 0000874501 us-gaap:RetainedEarningsMember 2019-09-30 0000874501 us-gaap:RetainedEarningsMember 2018-06-30 0000874501 us-gaap:NoncontrollingInterestMember 2019-09-30 0000874501 us-gaap:TreasuryStockMember 2018-06-30 0000874501 us-gaap:NoncontrollingInterestMember 2018-09-30 0000874501 us-gaap:CommonStockMember 2019-09-30 0000874501 2018-06-30 0000874501 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2018-06-30 0000874501 us-gaap:CommonStockMember 2019-07-01 2019-09-30 0000874501 2019-06-30 0000874501 us-gaap:RetainedEarningsMember 2019-07-01 2019-09-30 0000874501 us-gaap:RetainedEarningsMember 2018-07-01 2018-09-30 0000874501 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2019-07-01 2019-09-30 0000874501 us-gaap:PreferredStockMember 2018-07-01 2018-09-30 0000874501 us-gaap:TreasuryStockMember 2019-09-30 0000874501 us-gaap:PreferredStockMember 2019-09-30 0000874501 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2018-07-01 2018-09-30 0000874501 us-gaap:PreferredStockMember 2018-09-30 0000874501 us-gaap:AdditionalPaidInCapitalMember 2019-07-01 2019-09-30 0000874501 us-gaap:PreferredStockMember 2019-07-01 2019-09-30 0000874501 us-gaap:RetainedEarningsMember 2019-06-30 0000874501 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2018-09-30 0000874501 2018-09-30 0000874501 us-gaap:NoncontrollingInterestMember 2019-07-01 2019-09-30 0000874501 us-gaap:RetainedEarningsMember 2018-09-30 0000874501 us-gaap:AdditionalPaidInCapitalMember 2018-09-30 0000874501 us-gaap:TreasuryStockMember 2019-06-30 0000874501 us-gaap:AdditionalPaidInCapitalMember 2018-07-01 2018-09-30 0000874501 us-gaap:NoncontrollingInterestMember 2019-06-30 0000874501 us-gaap:TreasuryStockMember 2018-09-30 0000874501 us-gaap:NoncontrollingInterestMember 2018-06-30 0000874501 us-gaap:CommonStockMember 2018-07-01 2018-09-30 0000874501 us-gaap:AdditionalPaidInCapitalMember 2019-06-30 0000874501 us-gaap:CommonStockMember 2019-06-30 0000874501 us-gaap:AdditionalPaidInCapitalMember 2018-06-30 0000874501 us-gaap:CommonStockMember 2018-09-30 0000874501 us-gaap:PreferredStockMember 2018-06-30 0000874501 us-gaap:PreferredStockMember 2019-06-30 0000874501 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2019-06-30 0000874501 us-gaap:AdditionalPaidInCapitalMember 2019-09-30 0000874501 us-gaap:CommonStockMember 2018-06-30 0000874501 us-gaap:AccountingStandardsUpdate201601Member us-gaap:AccumulatedOtherComprehensiveIncomeMember 2018-01-01 2018-09-30 0000874501 us-gaap:PreferredStockMember 2019-01-01 2019-09-30 0000874501 us-gaap:NoncontrollingInterestMember 2018-01-01 2018-09-30 0000874501 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2018-01-01 2018-09-30 0000874501 us-gaap:CommonStockMember 2018-12-31 0000874501 us-gaap:TreasuryStockMember 2019-01-01 2019-09-30 0000874501 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2017-12-31 0000874501 us-gaap:RetainedEarningsMember 2018-01-01 2018-09-30 0000874501 us-gaap:AdditionalPaidInCapitalMember 2019-01-01 2019-09-30 0000874501 us-gaap:CommonStockMember 2019-01-01 2019-09-30 0000874501 us-gaap:AdditionalPaidInCapitalMember 2018-01-01 2018-09-30 0000874501 us-gaap:CommonStockMember 2018-01-01 2018-09-30 0000874501 us-gaap:NoncontrollingInterestMember 2017-12-31 0000874501 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2019-01-01 2019-09-30 0000874501 us-gaap:RetainedEarningsMember 2019-01-01 2019-09-30 0000874501 2017-12-31 0000874501 us-gaap:NoncontrollingInterestMember 2019-01-01 2019-09-30 0000874501 us-gaap:AdditionalPaidInCapitalMember 2017-12-31 0000874501 us-gaap:PreferredStockMember 2017-12-31 0000874501 us-gaap:TreasuryStockMember 2018-01-01 2018-09-30 0000874501 us-gaap:PreferredStockMember 2018-01-01 2018-09-30 0000874501 us-gaap:TreasuryStockMember 2017-12-31 0000874501 us-gaap:TreasuryStockMember 2018-12-31 0000874501 us-gaap:NoncontrollingInterestMember 2018-12-31 0000874501 us-gaap:PreferredStockMember 2018-12-31 0000874501 us-gaap:CommonStockMember 2017-12-31 0000874501 us-gaap:AccountingStandardsUpdate201601Member us-gaap:RetainedEarningsMember 2018-01-01 2018-09-30 0000874501 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2018-12-31 0000874501 us-gaap:AdditionalPaidInCapitalMember 2018-12-31 0000874501 us-gaap:RetainedEarningsMember 2017-12-31 0000874501 us-gaap:RetainedEarningsMember 2018-12-31 0000874501 us-gaap:LongTermDebtMember 2018-01-01 2018-09-30 0000874501 2018-08-03 0000874501 us-gaap:LongTermDebtMember 2019-01-01 2019-09-30 0000874501 us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-09-30 0000874501 ambc:AmbacAssuranceCorporationMember 2019-09-30 0000874501 ambc:LossandlossreservesMember 2019-01-01 2019-09-30 0000874501 us-gaap:PremiumsReceivableMember 2019-01-01 2019-09-30 0000874501 us-gaap:InvestmentsMember 2018-01-01 2018-09-30 0000874501 us-gaap:InvestmentsMember 2019-01-01 2019-09-30 0000874501 us-gaap:PremiumsReceivableMember 2018-01-01 2018-09-30 0000874501 ambc:AmbacAssuranceCorporationMember 2018-12-31 0000874501 ambc:LossandlossreservesMember 2018-01-01 2018-09-30 0000874501 us-gaap:AccountingStandardsUpdate201601Member us-gaap:DeferredIncomeTaxChargesMember us-gaap:AccumulatedOtherComprehensiveIncomeMember 2018-01-01 2018-09-30 0000874501 ambc:AmbacAssuranceMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-09-30 0000874501 ambc:AmbacUkMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-09-30 0000874501 ambc:AmbacUkMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0000874501 ambc:AmbacAssuranceMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0000874501 us-gaap:CorporateDebtSecuritiesMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-09-30 0000874501 us-gaap:MunicipalBondsMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-09-30 0000874501 ambc:AmbacUkMember us-gaap:MunicipalBondsMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-09-30 0000874501 us-gaap:ConsolidatedEntitiesMember 2019-09-30 0000874501 ambc:AmbacAssuranceMember us-gaap:MunicipalBondsMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0000874501 ambc:AmbacAssuranceMember us-gaap:MunicipalBondsMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-09-30 0000874501 ambc:AmbacAssuranceMember us-gaap:ConsolidatedEntitiesMember 2019-09-30 0000874501 ambc:AmbacUkMember us-gaap:MunicipalBondsMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0000874501 us-gaap:MunicipalBondsMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0000874501 ambc:AmbacUkMember us-gaap:CorporateDebtSecuritiesMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-09-30 0000874501 us-gaap:CorporateDebtSecuritiesMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0000874501 ambc:AmbacUkMember us-gaap:ConsolidatedEntitiesMember 2019-09-30 0000874501 ambc:AmbacAssuranceMember us-gaap:CorporateDebtSecuritiesMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-09-30 0000874501 us-gaap:ConsolidatedEntitiesMember 2018-12-31 0000874501 ambc:AmbacUkMember us-gaap:ConsolidatedEntitiesMember 2018-12-31 0000874501 ambc:AmbacUkMember us-gaap:CorporateDebtSecuritiesMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0000874501 ambc:AmbacAssuranceMember us-gaap:ConsolidatedEntitiesMember 2018-12-31 0000874501 ambc:AmbacAssuranceMember us-gaap:CorporateDebtSecuritiesMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0000874501 us-gaap:VariableInterestEntityPrimaryBeneficiaryAggregatedDisclosureMember 2018-12-31 0000874501 ambc:AssetBackedSecuritiesAndUtilityObligationsMember 2019-01-01 2019-09-30 0000874501 ambc:ConsolidatedVariableInterestEntitiesMember 2018-01-01 2018-09-30 0000874501 ambc:AmbacAssuranceCorporationMember ambc:AmbacNotePostExitFromRehabilitationMember 2018-12-31 0000874501 ambc:SponsoredVariableInterestEntitiesMember 2018-12-31 0000874501 us-gaap:VariableInterestEntityPrimaryBeneficiaryAggregatedDisclosureMember 2019-09-30 0000874501 ambc:AmbacMember 2019-09-30 0000874501 ambc:ConsolidatedVariableInterestEntitiesMember 2019-01-01 2019-09-30 0000874501 ambc:SponsoredVariableInterestEntitiesMember 2019-09-30 0000874501 ambc:AmbacAssuranceCorporationMember ambc:AmbacNotePostExitFromRehabilitationMember 2019-09-30 0000874501 ambc:AmbacMember 2018-12-31 0000874501 ambc:GlobalPublicFinanceMember 2018-12-31 0000874501 us-gaap:ResidentialMortgageBackedSecuritiesMember ambc:GlobalStructuredFinanceMember 2019-09-30 0000874501 us-gaap:OtherDebtSecuritiesMember ambc:GlobalStructuredFinanceMember 2018-12-31 0000874501 ambc:GlobalStructuredFinanceMember 2018-12-31 0000874501 ambc:OtherCommercialAssetBackedMember ambc:GlobalStructuredFinanceMember 2018-12-31 0000874501 ambc:OtherConsumerAssetBackedMember ambc:GlobalStructuredFinanceMember 2018-12-31 0000874501 ambc:GlobalStructuredFinanceMember 2019-09-30 0000874501 us-gaap:OtherDebtSecuritiesMember ambc:GlobalStructuredFinanceMember 2019-09-30 0000874501 us-gaap:CollateralizedDebtObligationsMember ambc:GlobalStructuredFinanceMember 2019-09-30 0000874501 ambc:OtherConsumerAssetBackedMember ambc:GlobalStructuredFinanceMember 2019-09-30 0000874501 ambc:OtherCommercialAssetBackedMember ambc:GlobalStructuredFinanceMember 2019-09-30 0000874501 us-gaap:CollateralizedDebtObligationsMember ambc:GlobalStructuredFinanceMember 2018-12-31 0000874501 us-gaap:ResidentialMortgageBackedSecuritiesMember ambc:GlobalStructuredFinanceMember 2018-12-31 0000874501 ambc:GlobalPublicFinanceMember 2019-09-30 0000874501 ambc:InsuranceIntangibleAssetMember 2019-01-01 2019-09-30 0000874501 us-gaap:VariableInterestEntityPrimaryBeneficiaryAggregatedDisclosureMember 2018-01-01 2018-09-30 0000874501 us-gaap:VariableInterestEntityPrimaryBeneficiaryAggregatedDisclosureMember 2019-07-01 2019-09-30 0000874501 us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-07-01 2018-09-30 0000874501 us-gaap:AvailableforsaleSecuritiesMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-07-01 2019-09-30 0000874501 us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-01-01 2019-09-30 0000874501 us-gaap:AvailableforsaleSecuritiesMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-01-01 2019-09-30 0000874501 us-gaap:AvailableforsaleSecuritiesMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-07-01 2018-09-30 0000874501 us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-01-01 2018-09-30 0000874501 us-gaap:AvailableforsaleSecuritiesMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-01-01 2018-09-30 0000874501 us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-07-01 2019-09-30 0000874501 us-gaap:VariableInterestEntityPrimaryBeneficiaryAggregatedDisclosureMember 2019-01-01 2019-09-30 0000874501 us-gaap:VariableInterestEntityPrimaryBeneficiaryAggregatedDisclosureMember 2018-07-01 2018-09-30 0000874501 us-gaap:ConsolidatedEntitiesMember 2018-07-01 2018-09-30 0000874501 us-gaap:ConsolidatedEntitiesMember 2019-07-01 2019-09-30 0000874501 us-gaap:ConsolidatedEntitiesMember 2018-01-01 2018-09-30 0000874501 us-gaap:AccumulatedTranslationAdjustmentMember 2018-01-01 2018-09-30 0000874501 us-gaap:AccumulatedGainLossFinancialLiabilityFairValueOptionAttributableToParentMember 2019-07-01 2019-09-30 0000874501 us-gaap:AccumulatedTranslationAdjustmentMember 2018-09-30 0000874501 us-gaap:AccumulatedGainLossFinancialLiabilityFairValueOptionAttributableToParentMember 2019-01-01 2019-09-30 0000874501 us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2017-12-31 0000874501 us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2018-01-01 2018-09-30 0000874501 us-gaap:AccumulatedTranslationAdjustmentMember 2019-01-01 2019-09-30 0000874501 us-gaap:AccumulatedGainLossFinancialLiabilityFairValueOptionAttributableToParentMember 2018-07-01 2018-09-30 0000874501 us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2019-01-01 2019-09-30 0000874501 us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember 2019-07-01 2019-09-30 0000874501 us-gaap:AccumulatedGainLossFinancialLiabilityFairValueOptionAttributableToParentMember 2017-12-31 0000874501 us-gaap:AccumulatedGainLossFinancialLiabilityFairValueOptionAttributableToParentMember 2019-09-30 0000874501 us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2019-06-30 0000874501 us-gaap:AccumulatedTranslationAdjustmentMember 2018-06-30 0000874501 us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember 2019-09-30 0000874501 us-gaap:AccumulatedGainLossFinancialLiabilityFairValueOptionAttributableToParentMember 2018-01-01 2018-09-30 0000874501 us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember 2018-01-01 2018-09-30 0000874501 us-gaap:AccumulatedTranslationAdjustmentMember 2019-09-30 0000874501 us-gaap:AccumulatedGainLossFinancialLiabilityFairValueOptionAttributableToParentMember 2018-09-30 0000874501 us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2018-07-01 2018-09-30 0000874501 us-gaap:AccumulatedTranslationAdjustmentMember 2018-07-01 2018-09-30 0000874501 us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember 2018-09-30 0000874501 us-gaap:AccumulatedTranslationAdjustmentMember 2017-12-31 0000874501 us-gaap:AccumulatedGainLossFinancialLiabilityFairValueOptionAttributableToParentMember 2018-12-31 0000874501 us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember 2018-07-01 2018-09-30 0000874501 us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember 2019-01-01 2019-09-30 0000874501 us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember 2018-12-31 0000874501 us-gaap:AccumulatedGainLossFinancialLiabilityFairValueOptionAttributableToParentMember 2019-06-30 0000874501 us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2019-07-01 2019-09-30 0000874501 us-gaap:AccumulatedGainLossFinancialLiabilityFairValueOptionAttributableToParentMember 2018-06-30 0000874501 us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2019-09-30 0000874501 us-gaap:AccumulatedTranslationAdjustmentMember 2019-07-01 2019-09-30 0000874501 us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2018-06-30 0000874501 us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2018-12-31 0000874501 us-gaap:AccumulatedTranslationAdjustmentMember 2019-06-30 0000874501 us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember 2019-06-30 0000874501 us-gaap:AccumulatedTranslationAdjustmentMember 2018-12-31 0000874501 us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember 2017-12-31 0000874501 us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2018-09-30 0000874501 us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember 2018-06-30 0000874501 us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2018-07-01 2018-09-30 0000874501 us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember us-gaap:AccumulatedGainLossFinancialLiabilityFairValueOptionIncludingPortionAttributableToNoncontrollingInterestMember 2019-07-01 2019-09-30 0000874501 us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember 2019-07-01 2019-09-30 0000874501 us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember 2019-01-01 2019-09-30 0000874501 us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2019-07-01 2019-09-30 0000874501 us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember us-gaap:AccumulatedGainLossFinancialLiabilityFairValueOptionIncludingPortionAttributableToNoncontrollingInterestMember 2018-01-01 2018-09-30 0000874501 us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember 2018-07-01 2018-09-30 0000874501 us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2018-01-01 2018-09-30 0000874501 us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember us-gaap:AccumulatedGainLossFinancialLiabilityFairValueOptionAttributableToParentMember 2019-01-01 2019-09-30 0000874501 us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2019-01-01 2019-09-30 0000874501 us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember 2019-07-01 2019-09-30 0000874501 us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember us-gaap:AccumulatedGainLossFinancialLiabilityFairValueOptionIncludingPortionAttributableToNoncontrollingInterestMember 2018-07-01 2018-09-30 0000874501 us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember 2018-01-01 2018-09-30 0000874501 us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember 2018-01-01 2018-09-30 0000874501 us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember 2019-01-01 2019-09-30 0000874501 us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember 2018-07-01 2018-09-30 0000874501 2013-05-01 0000874501 us-gaap:EmployeeStockOptionMember 2019-07-01 2019-09-30 0000874501 us-gaap:RestrictedStockUnitsRSUMember 2018-07-01 2018-09-30 0000874501 us-gaap:PerformanceSharesMember 2018-01-01 2018-09-30 0000874501 us-gaap:WarrantMember 2019-01-01 2019-09-30 0000874501 us-gaap:RestrictedStockUnitsRSUMember 2019-01-01 2019-09-30 0000874501 us-gaap:WarrantMember 2018-01-01 2018-09-30 0000874501 us-gaap:RestrictedStockUnitsRSUMember 2018-07-01 2018-09-30 0000874501 us-gaap:EmployeeStockOptionMember 2019-01-01 2019-09-30 0000874501 us-gaap:RestrictedStockUnitsRSUMember 2018-01-01 2018-09-30 0000874501 us-gaap:RestrictedStockUnitsRSUMember 2019-07-01 2019-09-30 0000874501 us-gaap:EmployeeStockOptionMember 2018-07-01 2018-09-30 0000874501 us-gaap:WarrantMember 2018-07-01 2018-09-30 0000874501 us-gaap:EmployeeStockOptionMember 2018-01-01 2018-09-30 0000874501 us-gaap:WarrantMember 2018-07-01 2018-09-30 0000874501 us-gaap:PerformanceSharesMember 2019-07-01 2019-09-30 0000874501 us-gaap:RestrictedStockUnitsRSUMember 2019-01-01 2019-09-30 0000874501 us-gaap:WarrantMember 2019-01-01 2019-09-30 0000874501 us-gaap:PerformanceSharesMember 2018-07-01 2018-09-30 0000874501 us-gaap:PerformanceSharesMember 2018-01-01 2018-09-30 0000874501 us-gaap:PerformanceSharesMember 2019-07-01 2019-09-30 0000874501 us-gaap:EmployeeStockOptionMember 2019-07-01 2019-09-30 0000874501 us-gaap:EmployeeStockOptionMember 2018-07-01 2018-09-30 0000874501 us-gaap:PerformanceSharesMember 2019-01-01 2019-09-30 0000874501 us-gaap:WarrantMember 2018-01-01 2018-09-30 0000874501 us-gaap:RestrictedStockUnitsRSUMember 2019-07-01 2019-09-30 0000874501 us-gaap:WarrantMember 2019-07-01 2019-09-30 0000874501 us-gaap:WarrantMember 2019-07-01 2019-09-30 0000874501 us-gaap:PerformanceSharesMember 2019-01-01 2019-09-30 0000874501 us-gaap:PerformanceSharesMember 2018-07-01 2018-09-30 0000874501 us-gaap:RestrictedStockUnitsRSUMember 2018-01-01 2018-09-30 0000874501 srt:ReportableGeographicalComponentsMember ambc:OtherInternationalMember 2019-07-01 2019-09-30 0000874501 srt:ReportableGeographicalComponentsMember country:GB 2019-01-01 2019-09-30 0000874501 srt:ReportableGeographicalComponentsMember country:US 2018-07-01 2018-09-30 0000874501 srt:ReportableGeographicalComponentsMember ambc:OtherInternationalMember 2019-01-01 2019-09-30 0000874501 srt:ReportableGeographicalComponentsMember ambc:OtherInternationalMember 2018-01-01 2018-09-30 0000874501 srt:ReportableGeographicalComponentsMember country:US 2019-07-01 2019-09-30 0000874501 srt:ReportableGeographicalComponentsMember country:US 2018-01-01 2018-09-30 0000874501 srt:ReportableGeographicalComponentsMember country:US 2019-01-01 2019-09-30 0000874501 srt:ReportableGeographicalComponentsMember country:GB 2018-07-01 2018-09-30 0000874501 srt:ReportableGeographicalComponentsMember country:GB 2019-07-01 2019-09-30 0000874501 srt:ReportableGeographicalComponentsMember country:GB 2018-01-01 2018-09-30 0000874501 srt:ReportableGeographicalComponentsMember ambc:OtherInternationalMember 2018-07-01 2018-09-30 0000874501 ambc:UnearnedPremiumReserveMember 2019-09-30 0000874501 ambc:PresentValueofExpectedNetCashFlowsRecoveriesMember 2018-12-31 0000874501 ambc:PresentValueofExpectedNetCashFlowsRecoveriesMember 2019-09-30 0000874501 ambc:UnearnedPremiumReserveMember 2018-12-31 0000874501 ambc:PresentValueofExpectedNetCashFlowsClaimsandLossExpensesMember 2019-09-30 0000874501 ambc:PresentValueofExpectedNetCashFlowsClaimsandLossExpensesMember 2018-12-31 0000874501 ambc:RandomSamplesMember 2019-01-01 2019-09-30 0000874501 ambc:RandomSamplesMember 2018-12-31 0000874501 ambc:RandomSamplesMember 2018-01-01 2018-09-30 0000874501 ambc:RandomSamplesMember 2017-12-31 0000874501 ambc:RandomSamplesMember 2018-09-30 0000874501 ambc:RandomSamplesMember 2019-09-30 0000874501 us-gaap:ExternalCreditRatingNonInvestmentGradeMember 2018-01-01 2018-12-31 0000874501 2018-02-12 0000874501 us-gaap:LongTermDebtMember 2019-09-30 0000874501 ambc:LossReservesClaimLiabilityMember 2019-01-01 2019-09-30 0000874501 currency:EUR 2018-09-30 0000874501 currency:GBP 2019-09-30 0000874501 ambc:CommonwealthofPuertoRicoMember 2019-01-01 2019-09-30 0000874501 currency:EUR 2019-09-30 0000874501 us-gaap:ExternalCreditRatingNonInvestmentGradeMember 2019-01-01 2019-09-30 0000874501 ambc:LossReservesClaimLiabilityMember 2018-01-01 2018-12-31 0000874501 us-gaap:LongTermDebtMember 2019-09-30 0000874501 currency:GBP 2018-09-30 0000874501 2019-02-12 0000874501 2018-01-01 2018-12-31 0000874501 ambc:SurveillanceCategoryTwoMember 2019-09-30 0000874501 ambc:SurveillanceCategoryOneMember 2019-09-30 0000874501 ambc:SurveillanceCategoryFiveMember 2019-01-01 2019-09-30 0000874501 ambc:SurveillanceCategoryFiveMember 2019-09-30 0000874501 ambc:SurveillanceCategoryThreeMember 2019-09-30 0000874501 ambc:SurveillanceCategoryOneaMember 2019-09-30 0000874501 ambc:SurveillanceCategoryFourMember 2019-09-30 0000874501 ambc:SurveillanceCategoryOneaMember 2019-01-01 2019-09-30 0000874501 ambc:SurveillanceCategoryThreeMember 2019-01-01 2019-09-30 0000874501 ambc:SurveillanceCategoryOneMember 2019-01-01 2019-09-30 0000874501 ambc:SurveillanceCategoryFourMember 2019-01-01 2019-09-30 0000874501 ambc:SurveillanceCategoryTwoMember 2019-01-01 2019-09-30 0000874501 ambc:SurveillanceCategoryTwoMember 2018-12-31 0000874501 ambc:SurveillanceCategoryFiveMember 2018-12-31 0000874501 ambc:SurveillanceCategoryOneMember 2018-12-31 0000874501 ambc:SurveillanceCategoryOneaMember 2018-12-31 0000874501 ambc:SurveillanceCategoryFourMember 2018-01-01 2018-12-31 0000874501 ambc:SurveillanceCategoryThreeMember 2018-12-31 0000874501 ambc:SurveillanceCategoryFourMember 2018-12-31 0000874501 ambc:SurveillanceCategoryFiveMember 2018-01-01 2018-12-31 0000874501 ambc:SurveillanceCategoryThreeMember 2018-01-01 2018-12-31 0000874501 ambc:SurveillanceCategoryOneMember 2018-01-01 2018-12-31 0000874501 ambc:SurveillanceCategoryTwoMember 2018-01-01 2018-12-31 0000874501 ambc:SurveillanceCategoryOneaMember 2018-01-01 2018-12-31 0000874501 us-gaap:InvestmentsMember us-gaap:FairValueInputsLevel3Member 2019-01-01 2019-09-30 0000874501 us-gaap:LoansReceivableMember us-gaap:FairValueInputsLevel3Member us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2017-12-31 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:DerivativeFinancialInstrumentsLiabilitiesMember 2018-01-01 2018-09-30 0000874501 us-gaap:FairValueInputsLevel3Member 2018-01-01 2018-09-30 0000874501 us-gaap:OtherAssetsMember us-gaap:FairValueInputsLevel3Member 2018-12-31 0000874501 us-gaap:LoansReceivableMember us-gaap:FairValueInputsLevel3Member us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-01-01 2018-09-30 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:LongTermDebtMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0000874501 us-gaap:OtherAssetsMember us-gaap:FairValueInputsLevel3Member 2019-01-01 2019-09-30 0000874501 us-gaap:OtherAssetsMember us-gaap:FairValueInputsLevel3Member 2018-09-30 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:LongTermDebtMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-01-01 2018-09-30 0000874501 us-gaap:OtherAssetsMember us-gaap:FairValueInputsLevel3Member 2018-01-01 2018-09-30 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:DerivativeFinancialInstrumentsLiabilitiesMember 2017-01-01 2017-09-30 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:LoanOriginationCommitmentsMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-01-01 2019-09-30 0000874501 us-gaap:CorporateDebtSecuritiesMember us-gaap:FairValueInputsLevel3Member us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-01-01 2018-09-30 0000874501 us-gaap:InvestmentsMember us-gaap:FairValueInputsLevel3Member 2018-01-01 2018-09-30 0000874501 us-gaap:DerivativeFinancialInstrumentsLiabilitiesMember us-gaap:FairValueInputsLevel3Member 2018-12-31 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:InvestmentContractsMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-01-01 2019-09-30 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:LongTermDebtMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-01-01 2019-09-30 0000874501 us-gaap:InvestmentsMember us-gaap:FairValueInputsLevel3Member 2017-12-31 0000874501 us-gaap:CorporateDebtSecuritiesMember us-gaap:FairValueInputsLevel3Member us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2017-01-01 2017-09-30 0000874501 us-gaap:DerivativeFinancialInstrumentsLiabilitiesMember us-gaap:FairValueInputsLevel3Member 2019-01-01 2019-09-30 0000874501 us-gaap:FairValueInputsLevel3Member 2019-01-01 2019-09-30 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:InvestmentContractsMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2017-01-01 2017-12-31 0000874501 us-gaap:CorporateDebtSecuritiesMember us-gaap:FairValueInputsLevel3Member us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2017-12-31 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:LoanOriginationCommitmentsMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-09-30 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:LoanOriginationCommitmentsMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2017-01-01 2017-12-31 0000874501 us-gaap:InvestmentsMember us-gaap:FairValueInputsLevel3Member 2017-01-01 2017-09-30 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:LongTermDebtMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2017-01-01 2017-12-31 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:LoanOriginationCommitmentsMember 2018-09-30 0000874501 us-gaap:InvestmentsMember us-gaap:FairValueInputsLevel3Member 2019-09-30 0000874501 us-gaap:OtherAssetsMember us-gaap:FairValueInputsLevel3Member 2017-01-01 2017-09-30 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:LongTermDebtMember 2018-09-30 0000874501 us-gaap:LoansReceivableMember us-gaap:FairValueInputsLevel3Member us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2017-01-01 2017-09-30 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:LongTermDebtMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2017-01-01 2017-09-30 0000874501 us-gaap:OtherAssetsMember us-gaap:FairValueInputsLevel3Member 2017-12-31 0000874501 us-gaap:FairValueInputsLevel3Member 2018-09-30 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:LongTermDebtMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-09-30 0000874501 us-gaap:FairValueInputsLevel3Member 2018-12-31 0000874501 us-gaap:FairValueInputsLevel3Member 2019-09-30 0000874501 us-gaap:FairValueInputsLevel3Member 2017-12-31 0000874501 us-gaap:FairValueInputsLevel3Member 2017-01-01 2017-09-30 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:InvestmentContractsMember 2018-09-30 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:LongTermDebtMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2017-12-31 0000874501 us-gaap:InvestmentsMember us-gaap:FairValueInputsLevel3Member 2017-01-01 2017-12-31 0000874501 us-gaap:OtherAssetsMember us-gaap:FairValueInputsLevel3Member 2017-01-01 2017-12-31 0000874501 us-gaap:InvestmentsMember us-gaap:FairValueInputsLevel3Member 2018-12-31 0000874501 us-gaap:DerivativeFinancialInstrumentsLiabilitiesMember us-gaap:FairValueInputsLevel3Member 2017-01-01 2017-12-31 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:InvestmentContractsMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-09-30 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:InvestmentContractsMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0000874501 us-gaap:DerivativeFinancialInstrumentsLiabilitiesMember us-gaap:FairValueInputsLevel3Member 2018-09-30 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:DerivativeFinancialInstrumentsLiabilitiesMember 2017-12-31 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:LoanOriginationCommitmentsMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0000874501 us-gaap:InvestmentsMember us-gaap:FairValueInputsLevel3Member 2018-09-30 0000874501 us-gaap:DerivativeFinancialInstrumentsLiabilitiesMember us-gaap:FairValueInputsLevel3Member 2019-09-30 0000874501 us-gaap:FairValueInputsLevel3Member 2017-01-01 2017-12-31 0000874501 us-gaap:OtherAssetsMember us-gaap:FairValueInputsLevel3Member 2019-09-30 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:CorporateDebtSecuritiesMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-09-30 0000874501 us-gaap:FairValueMeasurementsRecurringMember us-gaap:ResidentialMortgageBackedSecuritiesMember 2019-09-30 0000874501 us-gaap:CarryingReportedAmountFairValueDisclosureMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-09-30 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:AssetBackedSecuritiesMember 2019-09-30 0000874501 us-gaap:CarryingReportedAmountFairValueDisclosureMember 2019-09-30 0000874501 us-gaap:FairValueInputsLevel2Member 2019-09-30 0000874501 us-gaap:CarryingReportedAmountFairValueDisclosureMember us-gaap:MunicipalBondsMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-09-30 0000874501 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:CollateralizedDebtObligationsMember 2019-09-30 0000874501 us-gaap:FairValueInputsLevel1Member 2019-09-30 0000874501 us-gaap:FairValueMeasurementsRecurringMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-09-30 0000874501 us-gaap:FairValueMeasurementsRecurringMember us-gaap:OtherCreditDerivativesMember 2019-09-30 0000874501 us-gaap:FairValueInputsLevel2Member us-gaap:OtherCreditDerivativesMember 2019-09-30 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:InterestRateSwapMember 2019-09-30 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:MunicipalBondsMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-09-30 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-09-30 0000874501 us-gaap:FairValueMeasurementsRecurringMember us-gaap:ForeignGovernmentDebtSecuritiesMember 2019-09-30 0000874501 us-gaap:FairValueMeasurementsRecurringMember 2019-09-30 0000874501 us-gaap:FairValueMeasurementsRecurringMember us-gaap:CorporateDebtSecuritiesMember 2019-09-30 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:InterestRateSwapMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-09-30 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:MunicipalBondsMember 2019-09-30 0000874501 us-gaap:FairValueInputsLevel2Member us-gaap:OtherDebtSecuritiesMember 2019-09-30 0000874501 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:MunicipalBondsMember 2019-09-30 0000874501 us-gaap:FairValueInputsLevel2Member us-gaap:CurrencySwapMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-09-30 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:CorporateDebtSecuritiesMember 2019-09-30 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:ShortTermInvestmentsMember 2019-09-30 0000874501 us-gaap:FairValueInputsLevel1Member us-gaap:CorporateDebtSecuritiesMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-09-30 0000874501 us-gaap:OtherAssetsMember us-gaap:FairValueInputsLevel3Member us-gaap:InterestRateSwapMember 2019-09-30 0000874501 us-gaap:FairValueMeasurementsRecurringMember us-gaap:InterestRateSwapMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-09-30 0000874501 us-gaap:ResidentialMortgageBackedSecuritiesMember us-gaap:CarryingReportedAmountFairValueDisclosureMember 2019-09-30 0000874501 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:USGovernmentDebtSecuritiesMember 2019-09-30 0000874501 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:ForeignGovernmentDebtSecuritiesMember 2019-09-30 0000874501 us-gaap:CarryingReportedAmountFairValueDisclosureMember us-gaap:InterestRateSwapMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-09-30 0000874501 us-gaap:OtherAssetsMember us-gaap:FairValueInputsLevel1Member us-gaap:InterestRateSwapMember 2019-09-30 0000874501 us-gaap:FairValueInputsLevel2Member us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-09-30 0000874501 us-gaap:FairValueInputsLevel1Member us-gaap:InterestRateSwapMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-09-30 0000874501 us-gaap:CollateralPledgedMember us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:USGovernmentDebtSecuritiesMember 2019-09-30 0000874501 us-gaap:CarryingReportedAmountFairValueDisclosureMember us-gaap:InterestRateSwapMember 2019-09-30 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:USGovernmentDebtSecuritiesMember 2019-09-30 0000874501 us-gaap:CollateralPledgedMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:USGovernmentDebtSecuritiesMember 2019-09-30 0000874501 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:ForeignGovernmentDebtSecuritiesMember 2019-09-30 0000874501 us-gaap:OtherAssetsMember us-gaap:CarryingReportedAmountFairValueDisclosureMember us-gaap:InterestRateSwapMember 2019-09-30 0000874501 us-gaap:FairValueMeasurementsRecurringMember us-gaap:CollateralizedDebtObligationsMember 2019-09-30 0000874501 us-gaap:CollateralPledgedMember us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:USGovernmentDebtSecuritiesMember 2019-09-30 0000874501 us-gaap:OtherAssetsMember us-gaap:FairValueMeasurementsRecurringMember us-gaap:InterestRateSwapMember 2019-09-30 0000874501 us-gaap:FairValueInputsLevel1Member us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-09-30 0000874501 us-gaap:ForeignGovernmentDebtSecuritiesMember us-gaap:CarryingReportedAmountFairValueDisclosureMember 2019-09-30 0000874501 us-gaap:FairValueMeasurementsRecurringMember us-gaap:OtherDebtSecuritiesMember 2019-09-30 0000874501 us-gaap:FairValueInputsLevel1Member us-gaap:OtherCreditDerivativesMember 2019-09-30 0000874501 us-gaap:CarryingReportedAmountFairValueDisclosureMember us-gaap:ShortTermInvestmentsMember 2019-09-30 0000874501 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:AssetBackedSecuritiesMember 2019-09-30 0000874501 us-gaap:FairValueMeasurementsRecurringMember us-gaap:FutureMember 2019-09-30 0000874501 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:CorporateDebtSecuritiesMember 2019-09-30 0000874501 us-gaap:FairValueInputsLevel1Member us-gaap:CurrencySwapMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-09-30 0000874501 us-gaap:CollateralizedDebtObligationsMember us-gaap:CarryingReportedAmountFairValueDisclosureMember 2019-09-30 0000874501 us-gaap:FairValueInputsLevel2Member us-gaap:InterestRateSwapMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-09-30 0000874501 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:AssetBackedSecuritiesMember 2019-09-30 0000874501 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:CorporateDebtSecuritiesMember 2019-09-30 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:CurrencySwapMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-09-30 0000874501 us-gaap:FairValueInputsLevel2Member us-gaap:LoansReceivableMember 2019-09-30 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:ForeignGovernmentDebtSecuritiesMember 2019-09-30 0000874501 us-gaap:FairValueInputsLevel2Member us-gaap:FutureMember 2019-09-30 0000874501 us-gaap:FairValueInputsLevel1Member us-gaap:ShortTermInvestmentsMember 2019-09-30 0000874501 us-gaap:FairValueMeasurementsRecurringMember us-gaap:MunicipalBondsMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-09-30 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:OtherCreditDerivativesMember 2019-09-30 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:EquityMethodInvestmentsMember 2019-09-30 0000874501 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:USGovernmentDebtSecuritiesMember 2019-09-30 0000874501 us-gaap:CorporateDebtSecuritiesMember us-gaap:CarryingReportedAmountFairValueDisclosureMember 2019-09-30 0000874501 us-gaap:USGovernmentDebtSecuritiesMember us-gaap:CarryingReportedAmountFairValueDisclosureMember 2019-09-30 0000874501 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:CollateralizedDebtObligationsMember 2019-09-30 0000874501 us-gaap:CarryingReportedAmountFairValueDisclosureMember us-gaap:OtherDebtSecuritiesMember 2019-09-30 0000874501 us-gaap:FairValueInputsLevel2Member us-gaap:ShortTermInvestmentsMember 2019-09-30 0000874501 us-gaap:CarryingReportedAmountFairValueDisclosureMember us-gaap:OtherCreditDerivativesMember 2019-09-30 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:LoansReceivableMember 2019-09-30 0000874501 us-gaap:FairValueInputsLevel2Member us-gaap:InterestRateSwapMember 2019-09-30 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:OtherDebtSecuritiesMember 2019-09-30 0000874501 us-gaap:AssetBackedSecuritiesMember us-gaap:CarryingReportedAmountFairValueDisclosureMember 2019-09-30 0000874501 us-gaap:FairValueInputsLevel2Member us-gaap:MunicipalBondsMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-09-30 0000874501 us-gaap:CarryingReportedAmountFairValueDisclosureMember us-gaap:CurrencySwapMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-09-30 0000874501 us-gaap:FairValueMeasurementsRecurringMember us-gaap:ShortTermInvestmentsMember 2019-09-30 0000874501 us-gaap:FairValueInputsLevel1Member us-gaap:EquityMethodInvestmentsMember 2019-09-30 0000874501 us-gaap:MunicipalBondsMember us-gaap:CarryingReportedAmountFairValueDisclosureMember 2019-09-30 0000874501 us-gaap:CarryingReportedAmountFairValueDisclosureMember us-gaap:FutureMember 2019-09-30 0000874501 us-gaap:FairValueMeasurementsRecurringMember us-gaap:CurrencySwapMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-09-30 0000874501 us-gaap:FairValueMeasurementsRecurringMember us-gaap:EquityMethodInvestmentsMember 2019-09-30 0000874501 us-gaap:FairValueInputsLevel2Member us-gaap:EquityMethodInvestmentsMember 2019-09-30 0000874501 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:MunicipalBondsMember 2019-09-30 0000874501 us-gaap:FairValueMeasurementsRecurringMember us-gaap:USGovernmentDebtSecuritiesMember 2019-09-30 0000874501 us-gaap:FairValueInputsLevel1Member us-gaap:LoansReceivableMember 2019-09-30 0000874501 us-gaap:FairValueInputsLevel1Member us-gaap:MunicipalBondsMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-09-30 0000874501 us-gaap:FairValueMeasurementsRecurringMember us-gaap:CorporateDebtSecuritiesMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-09-30 0000874501 us-gaap:FairValueMeasurementsRecurringMember us-gaap:InterestRateSwapMember 2019-09-30 0000874501 us-gaap:FairValueInputsLevel1Member us-gaap:InterestRateSwapMember 2019-09-30 0000874501 us-gaap:FairValueMeasurementsRecurringMember us-gaap:MunicipalBondsMember 2019-09-30 0000874501 us-gaap:FairValueInputsLevel2Member us-gaap:CorporateDebtSecuritiesMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-09-30 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:FutureMember 2019-09-30 0000874501 us-gaap:CollateralPledgedMember us-gaap:FairValueMeasurementsRecurringMember us-gaap:USGovernmentDebtSecuritiesMember 2019-09-30 0000874501 us-gaap:OtherAssetsMember us-gaap:FairValueInputsLevel2Member us-gaap:InterestRateSwapMember 2019-09-30 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:ResidentialMortgageBackedSecuritiesMember 2019-09-30 0000874501 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:ResidentialMortgageBackedSecuritiesMember 2019-09-30 0000874501 us-gaap:CollateralPledgedMember us-gaap:USGovernmentDebtSecuritiesMember us-gaap:CarryingReportedAmountFairValueDisclosureMember 2019-09-30 0000874501 us-gaap:FairValueMeasurementsRecurringMember us-gaap:LoansReceivableMember 2019-09-30 0000874501 us-gaap:CarryingReportedAmountFairValueDisclosureMember us-gaap:CorporateDebtSecuritiesMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-09-30 0000874501 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:ResidentialMortgageBackedSecuritiesMember 2019-09-30 0000874501 us-gaap:FairValueInputsLevel1Member us-gaap:FutureMember 2019-09-30 0000874501 us-gaap:FairValueMeasurementsRecurringMember us-gaap:AssetBackedSecuritiesMember 2019-09-30 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:CollateralizedDebtObligationsMember 2019-09-30 0000874501 us-gaap:EstimateOfFairValueFairValueDisclosureMember 2019-09-30 0000874501 us-gaap:FairValueInputsLevel1Member us-gaap:OtherDebtSecuritiesMember 2019-09-30 0000874501 ambc:EuropeanTransactionsMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0000874501 ambc:EuropeanTransactionsMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-01-01 2018-12-31 0000874501 us-gaap:DerivativeMember 2018-01-01 2018-09-30 0000874501 ambc:CreditDerivativeMember 2019-01-01 2019-09-30 0000874501 ambc:CreditDerivativeMember us-gaap:DerivativeMember 2018-01-01 2018-09-30 0000874501 us-gaap:DerivativeMember 2019-01-01 2019-09-30 0000874501 us-gaap:InterestRateSwapMember us-gaap:DerivativeMember 2017-12-31 0000874501 ambc:CreditDerivativeMember 2018-12-31 0000874501 us-gaap:InterestRateSwapMember us-gaap:DerivativeMember 2018-01-01 2018-09-30 0000874501 us-gaap:InterestRateSwapMember 2019-09-30 0000874501 us-gaap:InterestRateSwapMember 2019-01-01 2019-09-30 0000874501 ambc:CreditDerivativeMember 2019-09-30 0000874501 ambc:CreditDerivativeMember us-gaap:DerivativeMember 2017-12-31 0000874501 us-gaap:DerivativeMember 2018-09-30 0000874501 us-gaap:InterestRateSwapMember 2018-12-31 0000874501 us-gaap:DerivativeMember 2018-12-31 0000874501 us-gaap:InterestRateSwapMember us-gaap:DerivativeMember 2018-09-30 0000874501 us-gaap:DerivativeMember 2017-12-31 0000874501 us-gaap:DerivativeMember 2019-09-30 0000874501 ambc:CreditDerivativeMember us-gaap:DerivativeMember 2018-09-30 0000874501 ambc:NonAgencyRMBSMember 2018-01-01 2018-09-30 0000874501 us-gaap:AssetBackedSecuritiesMember 2019-09-30 0000874501 us-gaap:AssetBackedSecuritiesMember 2018-01-01 2018-09-30 0000874501 us-gaap:AssetBackedSecuritiesMember 2019-01-01 2019-09-30 0000874501 us-gaap:AssetBackedSecuritiesMember 2017-12-31 0000874501 us-gaap:AssetBackedSecuritiesMember 2018-09-30 0000874501 ambc:NonAgencyRMBSMember 2019-01-01 2019-09-30 0000874501 ambc:NonAgencyRMBSMember 2018-09-30 0000874501 ambc:NonAgencyRMBSMember 2019-09-30 0000874501 ambc:NonAgencyRMBSMember 2017-12-31 0000874501 us-gaap:AssetBackedSecuritiesMember 2018-12-31 0000874501 ambc:NonAgencyRMBSMember 2018-12-31 0000874501 us-gaap:OtherAssetsMember us-gaap:FairValueInputsLevel3Member 2018-06-30 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:InvestmentContractsMember 2019-07-01 2019-09-30 0000874501 us-gaap:LoansReceivableMember us-gaap:FairValueInputsLevel3Member us-gaap:LoanOriginationCommitmentsMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-07-01 2018-09-30 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:LongTermDebtMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-09-30 0000874501 us-gaap:InvestmentsMember us-gaap:FairValueInputsLevel3Member 2018-07-01 2018-09-30 0000874501 us-gaap:DerivativeFinancialInstrumentsLiabilitiesMember us-gaap:FairValueInputsLevel3Member us-gaap:DerivativeFinancialInstrumentsLiabilitiesMember 2019-07-01 2019-09-30 0000874501 us-gaap:CorporateDebtSecuritiesMember us-gaap:FairValueInputsLevel3Member us-gaap:InvestmentContractsMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-07-01 2018-09-30 0000874501 us-gaap:CorporateDebtSecuritiesMember us-gaap:FairValueInputsLevel3Member us-gaap:InvestmentContractsMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-09-30 0000874501 us-gaap:LoansReceivableMember us-gaap:FairValueInputsLevel3Member us-gaap:LoanOriginationCommitmentsMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-07-01 2019-09-30 0000874501 us-gaap:CorporateDebtSecuritiesMember us-gaap:FairValueInputsLevel3Member us-gaap:InvestmentContractsMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-07-01 2019-09-30 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:LongTermDebtMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-07-01 2018-09-30 0000874501 us-gaap:OtherAssetsMember us-gaap:FairValueInputsLevel3Member 2019-07-01 2019-09-30 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:LoanOriginationCommitmentsMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-07-01 2018-09-30 0000874501 us-gaap:DerivativeFinancialInstrumentsLiabilitiesMember us-gaap:FairValueInputsLevel3Member us-gaap:DerivativeFinancialInstrumentsLiabilitiesMember 2018-09-30 0000874501 us-gaap:OtherAssetsMember us-gaap:FairValueInputsLevel3Member 2018-07-01 2018-09-30 0000874501 us-gaap:CorporateDebtSecuritiesMember us-gaap:FairValueInputsLevel3Member us-gaap:InvestmentContractsMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-06-30 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:LongTermDebtMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-06-30 0000874501 us-gaap:LoansReceivableMember us-gaap:FairValueInputsLevel3Member us-gaap:LoanOriginationCommitmentsMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-06-30 0000874501 us-gaap:LoansReceivableMember us-gaap:FairValueInputsLevel3Member us-gaap:LoanOriginationCommitmentsMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-09-30 0000874501 us-gaap:CorporateDebtSecuritiesMember us-gaap:FairValueInputsLevel3Member us-gaap:InvestmentContractsMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-06-30 0000874501 us-gaap:InvestmentsMember us-gaap:FairValueInputsLevel3Member 2019-06-30 0000874501 us-gaap:DerivativeFinancialInstrumentsLiabilitiesMember us-gaap:FairValueInputsLevel3Member us-gaap:DerivativeFinancialInstrumentsLiabilitiesMember 2018-06-30 0000874501 us-gaap:DerivativeFinancialInstrumentsLiabilitiesMember us-gaap:FairValueInputsLevel3Member us-gaap:DerivativeFinancialInstrumentsLiabilitiesMember 2018-07-01 2018-09-30 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:LongTermDebtMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-07-01 2019-09-30 0000874501 us-gaap:DerivativeFinancialInstrumentsLiabilitiesMember us-gaap:FairValueInputsLevel3Member us-gaap:DerivativeFinancialInstrumentsLiabilitiesMember 2019-09-30 0000874501 us-gaap:FairValueInputsLevel3Member 2018-07-01 2018-09-30 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:LongTermDebtMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-06-30 0000874501 us-gaap:FairValueInputsLevel3Member 2019-07-01 2019-09-30 0000874501 us-gaap:InvestmentsMember us-gaap:FairValueInputsLevel3Member 2019-07-01 2019-09-30 0000874501 us-gaap:DerivativeFinancialInstrumentsLiabilitiesMember us-gaap:FairValueInputsLevel3Member 2019-07-01 2019-09-30 0000874501 us-gaap:InvestmentsMember us-gaap:FairValueInputsLevel3Member 2018-06-30 0000874501 us-gaap:FairValueInputsLevel3Member 2018-06-30 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:LongTermDebtMember 2019-07-01 2019-09-30 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:LoanOriginationCommitmentsMember 2019-07-01 2019-09-30 0000874501 us-gaap:FairValueInputsLevel3Member 2019-06-30 0000874501 us-gaap:LoansReceivableMember us-gaap:FairValueInputsLevel3Member us-gaap:LoanOriginationCommitmentsMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-09-30 0000874501 us-gaap:OtherAssetsMember us-gaap:FairValueInputsLevel3Member 2019-06-30 0000874501 us-gaap:DerivativeFinancialInstrumentsLiabilitiesMember us-gaap:FairValueInputsLevel3Member us-gaap:DerivativeFinancialInstrumentsLiabilitiesMember 2019-06-30 0000874501 us-gaap:CorporateDebtSecuritiesMember us-gaap:FairValueInputsLevel3Member us-gaap:InvestmentContractsMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-09-30 0000874501 us-gaap:LoansReceivableMember us-gaap:FairValueInputsLevel3Member us-gaap:LoanOriginationCommitmentsMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-06-30 0000874501 us-gaap:OtherIncomeMember 2019-07-01 2019-09-30 0000874501 us-gaap:InvestmentIncomeMember 2018-07-01 2018-09-30 0000874501 us-gaap:OtherIncomeMember 2018-01-01 2018-09-30 0000874501 ambc:IncomeLossOnVariableInterestEntitiesMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-07-01 2018-09-30 0000874501 us-gaap:InvestmentIncomeMember 2019-01-01 2019-09-30 0000874501 us-gaap:GainLossOnDerivativeInstrumentsMember 2018-07-01 2018-09-30 0000874501 us-gaap:OtherIncomeMember 2018-07-01 2018-09-30 0000874501 us-gaap:InvestmentIncomeMember 2018-01-01 2018-09-30 0000874501 us-gaap:InterestRateSwapMember 2018-01-01 2018-09-30 0000874501 us-gaap:InvestmentIncomeMember 2019-07-01 2019-09-30 0000874501 us-gaap:InterestRateSwapMember 2019-01-01 2019-09-30 0000874501 ambc:IncomeLossOnVariableInterestEntitiesMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-07-01 2019-09-30 0000874501 us-gaap:GainLossOnDerivativeInstrumentsMember 2019-07-01 2019-09-30 0000874501 us-gaap:OtherIncomeMember 2019-01-01 2019-09-30 0000874501 ambc:NonAgencyRMBSMember 2019-07-01 2019-09-30 0000874501 ambc:NonAgencyRMBSMember 2019-06-30 0000874501 us-gaap:AssetBackedSecuritiesMember 2018-07-01 2018-09-30 0000874501 ambc:NonAgencyRMBSMember 2018-07-01 2018-09-30 0000874501 us-gaap:AssetBackedSecuritiesMember 2019-07-01 2019-09-30 0000874501 us-gaap:ResidentialMortgageBackedSecuritiesMember 2019-07-01 2019-09-30 0000874501 us-gaap:AssetBackedSecuritiesMember 2019-06-30 0000874501 ambc:NonAgencyRMBSMember 2018-06-30 0000874501 us-gaap:AssetBackedSecuritiesMember 2018-06-30 0000874501 us-gaap:ResidentialMortgageBackedSecuritiesMember 2018-07-01 2018-09-30 0000874501 us-gaap:AssetBackedSecuritiesMember 2018-12-31 0000874501 us-gaap:AssetBackedSecuritiesMember 2019-06-30 0000874501 us-gaap:AssetBackedSecuritiesMember 2018-01-01 2018-12-31 0000874501 us-gaap:AssetBackedSecuritiesMember 2019-01-01 2019-09-30 0000874501 us-gaap:FairValueInputsLevel1Member us-gaap:OtherCreditDerivativesMember 2018-12-31 0000874501 us-gaap:FairValueMeasurementsRecurringMember us-gaap:CorporateDebtSecuritiesMember 2018-12-31 0000874501 us-gaap:FairValueMeasurementsRecurringMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:EquityMethodInvestmentsMember 2018-12-31 0000874501 us-gaap:FairValueMeasurementsRecurringMember us-gaap:CollateralizedDebtObligationsMember 2018-12-31 0000874501 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:ForeignGovernmentDebtSecuritiesMember 2018-12-31 0000874501 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:ResidentialMortgageBackedSecuritiesMember 2018-12-31 0000874501 us-gaap:FairValueInputsLevel2Member 2018-12-31 0000874501 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:AssetBackedSecuritiesMember 2018-12-31 0000874501 us-gaap:FairValueMeasurementsRecurringMember 2018-12-31 0000874501 us-gaap:FairValueMeasurementsRecurringMember us-gaap:OtherCreditDerivativesMember 2018-12-31 0000874501 us-gaap:FairValueInputsLevel2Member us-gaap:FutureMember 2018-12-31 0000874501 us-gaap:FairValueInputsLevel1Member us-gaap:OtherDebtSecuritiesMember 2018-12-31 0000874501 us-gaap:FairValueInputsLevel2Member us-gaap:EquityMethodInvestmentsMember 2018-12-31 0000874501 us-gaap:FairValueMeasurementsRecurringMember us-gaap:ShortTermInvestmentsMember 2018-12-31 0000874501 us-gaap:ForeignGovernmentDebtSecuritiesMember us-gaap:CarryingReportedAmountFairValueDisclosureMember 2018-12-31 0000874501 us-gaap:CarryingReportedAmountFairValueDisclosureMember 2018-12-31 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:OtherDebtSecuritiesMember 2018-12-31 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:MunicipalBondsMember 2018-12-31 0000874501 us-gaap:OtherAssetsMember us-gaap:CarryingReportedAmountFairValueDisclosureMember us-gaap:InterestRateSwapMember 2018-12-31 0000874501 us-gaap:FairValueInputsLevel2Member us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0000874501 us-gaap:FairValueMeasurementsRecurringMember us-gaap:ResidentialMortgageBackedSecuritiesMember 2018-12-31 0000874501 us-gaap:FairValueInputsLevel2Member us-gaap:LoansReceivableMember 2018-12-31 0000874501 us-gaap:FairValueInputsLevel2Member us-gaap:ShortTermInvestmentsMember 2018-12-31 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:LoansReceivableMember 2018-12-31 0000874501 us-gaap:CarryingReportedAmountFairValueDisclosureMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0000874501 us-gaap:FairValueInputsLevel1Member us-gaap:CurrencySwapMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0000874501 us-gaap:OtherAssetsMember us-gaap:FairValueInputsLevel1Member us-gaap:InterestRateSwapMember 2018-12-31 0000874501 us-gaap:OtherAssetsMember us-gaap:FairValueInputsLevel3Member us-gaap:InterestRateSwapMember 2018-12-31 0000874501 us-gaap:AssetBackedSecuritiesMember us-gaap:CarryingReportedAmountFairValueDisclosureMember 2018-12-31 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:CollateralizedDebtObligationsMember 2018-12-31 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0000874501 us-gaap:FairValueMeasurementsRecurringMember us-gaap:EquityMethodInvestmentsMember 2018-12-31 0000874501 us-gaap:FairValueInputsLevel2Member us-gaap:InterestRateSwapMember 2018-12-31 0000874501 us-gaap:FairValueInputsLevel2Member us-gaap:CorporateDebtSecuritiesMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:CorporateDebtSecuritiesMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0000874501 us-gaap:FairValueInputsLevel1Member us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0000874501 us-gaap:FairValueInputsLevel1Member us-gaap:LoansReceivableMember 2018-12-31 0000874501 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:USGovernmentDebtSecuritiesMember 2018-12-31 0000874501 us-gaap:FairValueMeasurementsRecurringMember us-gaap:MunicipalBondsMember 2018-12-31 0000874501 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:MunicipalBondsMember 2018-12-31 0000874501 us-gaap:FairValueMeasurementsRecurringMember us-gaap:InterestRateSwapMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0000874501 us-gaap:CarryingReportedAmountFairValueDisclosureMember us-gaap:CorporateDebtSecuritiesMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0000874501 us-gaap:CarryingReportedAmountFairValueDisclosureMember us-gaap:OtherCreditDerivativesMember 2018-12-31 0000874501 us-gaap:MunicipalBondsMember us-gaap:CarryingReportedAmountFairValueDisclosureMember 2018-12-31 0000874501 us-gaap:FairValueInputsLevel1Member us-gaap:FutureMember 2018-12-31 0000874501 us-gaap:CarryingReportedAmountFairValueDisclosureMember us-gaap:CurrencySwapMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0000874501 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:CorporateDebtSecuritiesMember 2018-12-31 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:USGovernmentDebtSecuritiesMember 2018-12-31 0000874501 us-gaap:FairValueInputsLevel2Member us-gaap:OtherDebtSecuritiesMember 2018-12-31 0000874501 us-gaap:FairValueInputsLevel1Member us-gaap:InterestRateSwapMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0000874501 us-gaap:FairValueInputsLevel1Member us-gaap:ShortTermInvestmentsMember 2018-12-31 0000874501 us-gaap:FairValueMeasurementsRecurringMember us-gaap:CorporateDebtSecuritiesMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0000874501 us-gaap:ResidentialMortgageBackedSecuritiesMember us-gaap:CarryingReportedAmountFairValueDisclosureMember 2018-12-31 0000874501 us-gaap:FairValueMeasurementsRecurringMember us-gaap:ForeignGovernmentDebtSecuritiesMember 2018-12-31 0000874501 us-gaap:FairValueMeasurementsRecurringMember us-gaap:InterestRateSwapMember 2018-12-31 0000874501 us-gaap:FairValueInputsLevel2Member us-gaap:CurrencySwapMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0000874501 us-gaap:EstimateOfFairValueFairValueDisclosureMember 2018-12-31 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:AssetBackedSecuritiesMember 2018-12-31 0000874501 us-gaap:CarryingReportedAmountFairValueDisclosureMember us-gaap:ShortTermInvestmentsMember 2018-12-31 0000874501 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:MunicipalBondsMember 2018-12-31 0000874501 us-gaap:FairValueInputsLevel2Member us-gaap:OtherCreditDerivativesMember 2018-12-31 0000874501 us-gaap:FairValueInputsLevel1Member us-gaap:InterestRateSwapMember 2018-12-31 0000874501 us-gaap:FairValueInputsLevel1Member us-gaap:EquityMethodInvestmentsMember 2018-12-31 0000874501 us-gaap:CarryingReportedAmountFairValueDisclosureMember us-gaap:OtherDebtSecuritiesMember 2018-12-31 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:CorporateDebtSecuritiesMember 2018-12-31 0000874501 us-gaap:FairValueMeasurementsRecurringMember us-gaap:OtherDebtSecuritiesMember 2018-12-31 0000874501 us-gaap:CarryingReportedAmountFairValueDisclosureMember us-gaap:InterestRateSwapMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0000874501 us-gaap:OtherAssetsMember us-gaap:FairValueInputsLevel2Member us-gaap:InterestRateSwapMember 2018-12-31 0000874501 us-gaap:CollateralizedDebtObligationsMember us-gaap:CarryingReportedAmountFairValueDisclosureMember 2018-12-31 0000874501 us-gaap:USGovernmentDebtSecuritiesMember us-gaap:CarryingReportedAmountFairValueDisclosureMember 2018-12-31 0000874501 us-gaap:FairValueMeasurementsRecurringMember us-gaap:LoansReceivableMember 2018-12-31 0000874501 us-gaap:FairValueInputsLevel1Member 2018-12-31 0000874501 us-gaap:CarryingReportedAmountFairValueDisclosureMember us-gaap:FutureMember 2018-12-31 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:OtherCreditDerivativesMember 2018-12-31 0000874501 us-gaap:FairValueMeasurementsRecurringMember us-gaap:USGovernmentDebtSecuritiesMember 2018-12-31 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:ResidentialMortgageBackedSecuritiesMember 2018-12-31 0000874501 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:CollateralizedDebtObligationsMember 2018-12-31 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:ShortTermInvestmentsMember 2018-12-31 0000874501 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:USGovernmentDebtSecuritiesMember 2018-12-31 0000874501 us-gaap:CorporateDebtSecuritiesMember us-gaap:CarryingReportedAmountFairValueDisclosureMember 2018-12-31 0000874501 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:CollateralizedDebtObligationsMember 2018-12-31 0000874501 us-gaap:FairValueInputsLevel2Member us-gaap:InterestRateSwapMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0000874501 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:ForeignGovernmentDebtSecuritiesMember 2018-12-31 0000874501 us-gaap:FairValueMeasurementsRecurringMember us-gaap:AssetBackedSecuritiesMember 2018-12-31 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:CurrencySwapMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0000874501 us-gaap:OtherAssetsMember us-gaap:FairValueMeasurementsRecurringMember us-gaap:InterestRateSwapMember 2018-12-31 0000874501 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:ResidentialMortgageBackedSecuritiesMember 2018-12-31 0000874501 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:CorporateDebtSecuritiesMember 2018-12-31 0000874501 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:AssetBackedSecuritiesMember 2018-12-31 0000874501 us-gaap:CarryingReportedAmountFairValueDisclosureMember us-gaap:InterestRateSwapMember 2018-12-31 0000874501 us-gaap:FairValueMeasurementsRecurringMember us-gaap:CurrencySwapMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0000874501 us-gaap:FairValueMeasurementsRecurringMember us-gaap:FutureMember 2018-12-31 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:InterestRateSwapMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:ForeignGovernmentDebtSecuritiesMember 2018-12-31 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:InterestRateSwapMember 2018-12-31 0000874501 us-gaap:FairValueInputsLevel1Member us-gaap:CorporateDebtSecuritiesMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0000874501 us-gaap:FairValueInputsLevel3Member us-gaap:FutureMember 2018-12-31 0000874501 us-gaap:InterestRateSwapMember us-gaap:InterestRateSwapMember 2018-07-01 2018-09-30 0000874501 ambc:CreditDerivativeMember ambc:CreditDerivativeMember 2018-07-01 2018-09-30 0000874501 ambc:CreditDerivativeMember ambc:CreditDerivativeMember 2019-07-01 2019-09-30 0000874501 ambc:CreditDerivativeMember ambc:CreditDerivativeMember 2019-06-30 0000874501 us-gaap:InterestRateSwapMember us-gaap:InterestRateSwapMember 2019-07-01 2019-09-30 0000874501 us-gaap:InterestRateSwapMember us-gaap:InterestRateSwapMember 2018-06-30 0000874501 us-gaap:DerivativeMember 2019-07-01 2019-09-30 0000874501 us-gaap:DerivativeMember 2018-07-01 2018-09-30 0000874501 us-gaap:InterestRateSwapMember us-gaap:InterestRateSwapMember 2019-06-30 0000874501 us-gaap:DerivativeMember 2019-06-30 0000874501 us-gaap:InterestRateSwapMember us-gaap:InterestRateSwapMember 2019-09-30 0000874501 ambc:CreditDerivativeMember ambc:CreditDerivativeMember 2018-06-30 0000874501 ambc:CreditDerivativeMember ambc:CreditDerivativeMember 2019-09-30 0000874501 ambc:CreditDerivativeMember ambc:CreditDerivativeMember 2018-09-30 0000874501 us-gaap:InterestRateSwapMember us-gaap:InterestRateSwapMember 2018-09-30 0000874501 us-gaap:DerivativeMember 2018-06-30 0000874501 ambc:VariableInterestEntityMember 2019-06-30 0000874501 us-gaap:FairValueMeasuredAtNetAssetValuePerShareMember 2018-12-31 0000874501 us-gaap:FairValueMeasuredAtNetAssetValuePerShareMember 2019-09-30 0000874501 us-gaap:FixedIncomeSecuritiesMember 2018-12-31 0000874501 ambc:VariableInterestEntityMember 2018-12-31 0000874501 srt:MaximumMember us-gaap:FixedIncomeSecuritiesMember 2019-06-30 0000874501 ambc:EuropeanTransactionsMember us-gaap:FairValueInputsLevel3Member 2018-12-31 0000874501 ambc:EuropeanTransactionsMember us-gaap:FairValueInputsLevel3Member 2019-06-30 0000874501 us-gaap:FixedIncomeSecuritiesMember 2019-06-30 0000874501 srt:MinimumMember us-gaap:FixedIncomeSecuritiesMember 2019-06-30 0000874501 srt:MaximumMember us-gaap:FixedIncomeSecuritiesMember 2018-12-31 0000874501 srt:MinimumMember us-gaap:FixedIncomeSecuritiesMember 2018-12-31 0000874501 us-gaap:VariableInterestEntityNotPrimaryBeneficiaryAggregatedDisclosureMember 2019-01-01 2019-09-30 0000874501 ambc:IlliquidInvestmentsMember 2019-09-30 0000874501 us-gaap:EquityMember 2019-09-30 0000874501 us-gaap:InterestRateContractMember 2019-09-30 0000874501 ambc:InsuranceLinkedMember 2018-12-31 0000874501 us-gaap:CreditIndexProductMember 2019-09-30 0000874501 us-gaap:RealEstateMember 2018-12-31 0000874501 us-gaap:InterestRateContractMember 2018-12-31 0000874501 ambc:IlliquidInvestmentsMember 2018-12-31 0000874501 ambc:InsuranceLinkedMember 2019-09-30 0000874501 us-gaap:EquityMember 2018-12-31 0000874501 us-gaap:RealEstateMember 2019-09-30 0000874501 ambc:BelowInvestmentGradeSecuritiesAndNonRatedSecuritiesMember 2019-09-30 0000874501 ambc:CapitalofDislocationsMember us-gaap:CommitmentsMember 2019-09-30 0000874501 2013-04-01 2013-04-30 0000874501 ambc:PricedThroughPricingVendorsMember us-gaap:EquityMember 2019-09-30 0000874501 ambc:InvestmentPortfolioMember 2019-09-30 0000874501 ambc:AmbacUkMember 2019-09-30 0000874501 srt:PartnershipInterestMember us-gaap:CommitmentsMember 2019-09-30 0000874501 ambc:AmbacUkMember 2018-12-31 0000874501 ambc:AmbacAssuranceMember 2019-09-30 0000874501 us-gaap:CarryingReportedAmountFairValueDisclosureMember us-gaap:InterestRateContractMember 2019-09-30 0000874501 us-gaap:CarryingReportedAmountFairValueDisclosureMember us-gaap:InterestRateContractMember 2018-12-31 0000874501 ambc:AmbacAssuranceMember 2018-12-31 0000874501 ambc:PricedThroughPricingVendorsMember us-gaap:EquityMember 2018-12-31 0000874501 ambc:InvestmentPortfolioMember 2018-12-31 0000874501 us-gaap:GainLossOnInvestmentsMember1 2018-01-01 2018-09-30 0000874501 us-gaap:GainLossOnInvestmentsMember1 2019-07-01 2019-09-30 0000874501 us-gaap:GainLossOnInvestmentsMember1 2019-01-01 2019-09-30 0000874501 us-gaap:GainLossOnInvestmentsMember1 2018-07-01 2018-09-30 0000874501 us-gaap:CollateralizedDebtObligationsMember us-gaap:FixedIncomeSecuritiesMember 2019-09-30 0000874501 us-gaap:AssetBackedSecuritiesMember us-gaap:FixedIncomeSecuritiesMember 2019-09-30 0000874501 us-gaap:ResidentialMortgageBackedSecuritiesMember us-gaap:FixedIncomeSecuritiesMember 2019-09-30 0000874501 us-gaap:FixedIncomeInvestmentsMember 2018-01-01 2018-09-30 0000874501 us-gaap:LoansReceivableMember 2019-07-01 2019-09-30 0000874501 us-gaap:ShortTermInvestmentsMember 2018-01-01 2018-09-30 0000874501 us-gaap:FixedIncomeInvestmentsMember 2018-07-01 2018-09-30 0000874501 us-gaap:LoansReceivableMember 2018-07-01 2018-09-30 0000874501 us-gaap:OtherInvestmentsMember 2019-01-01 2019-09-30 0000874501 us-gaap:ShortTermInvestmentsMember 2018-07-01 2018-09-30 0000874501 us-gaap:LoansReceivableMember 2019-01-01 2019-09-30 0000874501 us-gaap:OtherInvestmentsMember 2018-01-01 2018-09-30 0000874501 us-gaap:FixedIncomeInvestmentsMember 2019-07-01 2019-09-30 0000874501 us-gaap:FixedIncomeInvestmentsMember 2019-01-01 2019-09-30 0000874501 us-gaap:OtherInvestmentsMember 2019-07-01 2019-09-30 0000874501 us-gaap:ShortTermInvestmentsMember 2019-01-01 2019-09-30 0000874501 us-gaap:ShortTermInvestmentsMember 2019-07-01 2019-09-30 0000874501 us-gaap:OtherInvestmentsMember 2018-07-01 2018-09-30 0000874501 us-gaap:LoansReceivableMember 2018-01-01 2018-09-30 0000874501 us-gaap:MunicipalBondsMember us-gaap:FixedIncomeSecuritiesMember 2018-12-31 0000874501 us-gaap:USGovernmentDebtSecuritiesMember us-gaap:FixedIncomeSecuritiesMember 2018-12-31 0000874501 us-gaap:AssetBackedSecuritiesMember us-gaap:FixedIncomeSecuritiesMember 2018-12-31 0000874501 us-gaap:ResidentialMortgageBackedSecuritiesMember us-gaap:FixedIncomeSecuritiesMember 2018-12-31 0000874501 us-gaap:CollateralizedDebtObligationsMember us-gaap:FixedIncomeSecuritiesMember 2018-12-31 0000874501 us-gaap:CorporateDebtSecuritiesMember us-gaap:FixedIncomeSecuritiesMember 2018-12-31 0000874501 us-gaap:ForeignGovernmentDebtSecuritiesMember us-gaap:FixedIncomeSecuritiesMember 2018-12-31 0000874501 ambc:GainslossesonsecuritiesheldasofreportingdateMember 2018-07-01 2018-09-30 0000874501 ambc:GainslossesonsecuritiesheldasofreportingdateMember 2018-01-01 2018-09-30 0000874501 ambc:GainslossesonsecuritiesheldasofreportingdateMember 2019-01-01 2019-09-30 0000874501 ambc:GainslossesonsecuritiesheldasofreportingdateMember 2019-07-01 2019-09-30 0000874501 srt:StandardPoorsCCRatingMember us-gaap:MunicipalBondsMember 2018-12-31 0000874501 srt:StandardPoorsCCCMinusRatingMember ambc:MortgageAndOtherAssetBackedSecuritiesMember 2018-09-30 0000874501 srt:StandardPoorsCCCMinusRatingMember us-gaap:MunicipalBondsMember 2018-09-30 0000874501 srt:StandardPoorsCCRatingMember us-gaap:CorporateDebtSecuritiesMember ambc:AmbacAssuranceCorporationMember 2018-12-31 0000874501 srt:StandardPoorsBBBMinusRatingMember us-gaap:CorporateDebtSecuritiesMember ambc:NationalPublicFinanceGuaranteeCorporationMember 2018-12-31 0000874501 srt:StandardPoorsBBBMinusRatingMember us-gaap:CorporateDebtSecuritiesMember ambc:NationalPublicFinanceGuaranteeCorporationMember 2018-09-30 0000874501 srt:StandardPoorsBBBMinusRatingMember ambc:NationalPublicFinanceGuaranteeCorporationMember 2018-09-30 0000874501 srt:StandardPoorsCCRatingMember us-gaap:CorporateDebtSecuritiesMember ambc:AmbacAssuranceCorporationMember 2018-09-30 0000874501 srt:StandardPoorsCCRatingMember ambc:MortgageAndOtherAssetBackedSecuritiesMember ambc:AmbacAssuranceCorporationMember 2018-12-31 0000874501 srt:StandardPoorsBBBMinusRatingMember us-gaap:MunicipalBondsMember ambc:NationalPublicFinanceGuaranteeCorporationMember 2018-09-30 0000874501 srt:StandardPoorsCCRatingMember ambc:MortgageAndOtherAssetBackedSecuritiesMember ambc:AmbacAssuranceCorporationMember 2018-09-30 0000874501 srt:StandardPoorsBBBMinusRatingMember ambc:NationalPublicFinanceGuaranteeCorporationMember 2018-12-31 0000874501 srt:StandardPoorsCCCMinusRatingMember us-gaap:CorporateDebtSecuritiesMember 2018-09-30 0000874501 srt:StandardPoorsCCRatingMember us-gaap:CorporateDebtSecuritiesMember 2018-12-31 0000874501 srt:StandardPoorsCCRatingMember ambc:AmbacAssuranceCorporationMember 2018-12-31 0000874501 srt:StandardPoorsCCRatingMember 2018-12-31 0000874501 srt:StandardPoorsCCRatingMember ambc:AmbacAssuranceCorporationMember 2018-09-30 0000874501 srt:StandardPoorsCCRatingMember us-gaap:MunicipalBondsMember ambc:AmbacAssuranceCorporationMember 2018-09-30 0000874501 srt:StandardPoorsCCRatingMember us-gaap:MunicipalBondsMember ambc:AmbacAssuranceCorporationMember 2018-12-31 0000874501 srt:StandardPoorsBBBMinusRatingMember us-gaap:MunicipalBondsMember ambc:NationalPublicFinanceGuaranteeCorporationMember 2018-12-31 0000874501 srt:StandardPoorsCCRatingMember ambc:MortgageAndOtherAssetBackedSecuritiesMember 2018-12-31 0000874501 srt:StandardPoorsCCCMinusRatingMember 2018-09-30 0000874501 us-gaap:CorporateDebtSecuritiesMember us-gaap:FixedIncomeSecuritiesMember 2019-09-30 0000874501 us-gaap:CollateralPledgedMember us-gaap:USGovernmentDebtSecuritiesMember us-gaap:FixedIncomeSecuritiesMember 2019-09-30 0000874501 us-gaap:USGovernmentDebtSecuritiesMember us-gaap:FixedIncomeSecuritiesMember 2019-09-30 0000874501 us-gaap:ForeignGovernmentDebtSecuritiesMember us-gaap:FixedIncomeSecuritiesMember 2019-09-30 0000874501 ambc:FixedIncomeInvestmentsAndOtherInvestmentsMember 2019-09-30 0000874501 us-gaap:MunicipalBondsMember us-gaap:FixedIncomeSecuritiesMember 2019-09-30 0000874501 us-gaap:AssetPledgedAsCollateralMember us-gaap:FixedIncomeSecuritiesMember 2019-09-30 0000874501 us-gaap:FutureMember 2019-09-30 0000874501 us-gaap:OtherCreditDerivativesMember 2019-09-30 0000874501 us-gaap:InterestRateSwapMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-09-30 0000874501 us-gaap:CurrencySwapMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-09-30 0000874501 us-gaap:InterestRateSwapMember 2019-09-30 0000874501 ambc:InterestRateSwapOneMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-09-30 0000874501 ambc:InterestRateSwapOneMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0000874501 us-gaap:InterestRateSwapMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0000874501 us-gaap:CurrencySwapMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0000874501 us-gaap:OtherCreditDerivativesMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-09-30 0000874501 us-gaap:OtherCreditDerivativesMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0000874501 ambc:AfsMember ambc:InterestRateSwapOneMember 2018-12-31 0000874501 ambc:AfsMember us-gaap:InterestRateSwapMember 2019-09-30 0000874501 ambc:AfsMember us-gaap:InterestRateSwapMember 2018-12-31 0000874501 ambc:AfsMember us-gaap:FutureMember 2019-09-30 0000874501 ambc:AfsMember us-gaap:FutureMember 2018-12-31 0000874501 ambc:AfsMember ambc:InterestRateSwapOneMember 2019-09-30 0000874501 us-gaap:CurrencySwapMember ambc:IncomeLossOnVariableInterestEntitiesMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-07-01 2019-09-30 0000874501 us-gaap:InterestRateSwapMember ambc:IncomeLossOnVariableInterestEntitiesMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-07-01 2019-09-30 0000874501 us-gaap:InterestRateSwapMember ambc:IncomeLossOnVariableInterestEntitiesMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-01-01 2019-09-30 0000874501 ambc:CreditDerivativesMember ambc:NetgainslossesonderivativecontractsDomain 2018-07-01 2018-09-30 0000874501 us-gaap:InterestRateSwapMember ambc:DerivativeProductsMember 2019-01-01 2019-09-30 0000874501 us-gaap:CurrencySwapMember ambc:IncomeLossOnVariableInterestEntitiesMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-01-01 2019-09-30 0000874501 us-gaap:InterestRateSwapMember ambc:IncomeLossOnVariableInterestEntitiesMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-01-01 2018-09-30 0000874501 us-gaap:CurrencySwapMember ambc:IncomeLossOnVariableInterestEntitiesMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-01-01 2018-09-30 0000874501 ambc:OtherContractsMember ambc:DerivativeProductsMember 2019-01-01 2019-09-30 0000874501 ambc:CreditDerivativesMember ambc:NetgainslossesonderivativecontractsDomain 2019-07-01 2019-09-30 0000874501 us-gaap:FutureMember ambc:NetgainslossesonderivativecontractsDomain 2018-07-01 2018-09-30 0000874501 us-gaap:InterestRateSwapMember ambc:NetgainslossesonderivativecontractsDomain 2018-07-01 2018-09-30 0000874501 ambc:IncomeLossOnVariableInterestEntitiesMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-01-01 2018-09-30 0000874501 ambc:IncomeLossOnVariableInterestEntitiesMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-01-01 2019-09-30 0000874501 us-gaap:InterestRateSwapMember ambc:IncomeLossOnVariableInterestEntitiesMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-07-01 2018-09-30 0000874501 us-gaap:FutureMember ambc:NetgainslossesonderivativecontractsDomain 2019-07-01 2019-09-30 0000874501 us-gaap:CurrencySwapMember ambc:IncomeLossOnVariableInterestEntitiesMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-07-01 2018-09-30 0000874501 ambc:CreditDerivativesMember ambc:NetChangeInFairValueOfCreditDerivativesMember 2019-01-01 2019-09-30 0000874501 us-gaap:InterestRateSwapMember ambc:DerivativeProductsMember 2018-01-01 2018-09-30 0000874501 us-gaap:InterestRateSwapMember ambc:NetgainslossesonderivativecontractsDomain 2019-07-01 2019-09-30 0000874501 ambc:OtherContractsMember ambc:DerivativeProductsMember 2018-01-01 2018-09-30 0000874501 ambc:CreditDerivativesMember ambc:NetChangeInFairValueOfCreditDerivativesMember 2018-01-01 2018-09-30 0000874501 us-gaap:InterestRateSwapMember 2018-12-31 0000874501 us-gaap:FutureMember 2018-12-31 0000874501 us-gaap:OtherCreditDerivativesMember 2018-12-31 0000874501 us-gaap:OtherCreditDerivativesMember 2018-12-31 0000874501 ambc:AaRatingMember us-gaap:OtherCreditDerivativesMember 2019-09-30 0000874501 ambc:TierDMember 2011-01-01 2011-09-30 0000874501 ambc:TierAMember 2011-09-30 0000874501 ambc:TierDMember 2011-09-30 0000874501 ambc:TierCMember 2011-09-30 0000874501 ambc:TierCMember 2011-01-01 2011-09-30 0000874501 ambc:TierBMember 2011-01-01 2011-09-30 0000874501 ambc:TierAMember 2011-01-01 2011-09-30 0000874501 ambc:TierBMember 2011-09-30 0000874501 us-gaap:DomesticCountryMember 2019-09-30 0000874501 ambc:AmbacAssuranceMember 2019-01-01 2019-09-30 0000874501 ambc:AfgMember 2019-09-30 0000874501 2011-09-30 0000874501 srt:MinimumMember 2019-01-01 2019-09-30 0000874501 srt:MaximumMember 2019-01-01 2019-09-30 0000874501 ambc:OtherPartyMember 2019-09-30 0000874501 exch:CGMI 2019-09-30 xbrli:pure ambc:Entity iso4217:USD xbrli:shares iso4217:USD xbrli:shares iso4217:EUR iso4217:GBP ambc:Policies

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM
 
10-Q
☒
QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the Quarterly Period Ended September 30, 2019
☐
TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
Commission File Number:
 
1-10777
AMBAC FINANCIAL GROUP INC
Exact name of Registrant as specified in its charter)
Delaware
 
13-3621676
(State of incorporation)
 
(I.R.S. employer identification no.)
 
 
 
One State Street Plaza
New York
NY
 
10004
(Address of principal executive offices)
 
(Zip code)
 
(212)
658-7470
 
(Registrant's telephone number, including area code)
Securities registered pursuant to Section 12(b) of the Act:
 
 
Title of each class
 
Trading Symbol
 
Name of each exchange on which registered
Common stock par value $0.01 per share
 
AMBC
 
NASDAQ
Indicate by check mark whether the Registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the Registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  ☒    No  ☐
Indicate by check mark whether the Registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the Registrant was required to submit such files).    Yes ☒    No  ☐
Indicate by check mark whether the Registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company or an emerging growth company. See definition of “large accelerated filer”, “accelerated filer”, “smaller reporting company” and "emerging growth company" in Rule 12b-2 of the Exchange Act): (Check one):
Large accelerated filer
☒
Accelerated filer
☐
Non-accelerated filer
☐
Smaller reporting company
☐
Emerging growth company
☐
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐
Indicate by check mark whether the Registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).  Yes  ☐    No  ☒
Indicate by check mark whether the registrant has filed all documents and reports required to be filed by Sections 12, 13 or 15(d) of the Securities Exchange Act of 1934 subsequent to the distribution of securities under a plan confirmed by a court.    Yes  ☒    No  ☐
As of November 4, 2019, 45,553,840 shares of common stock, par value $0.01 per share, of the Registrant were outstanding.



AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES
TABLE OF CONTENTS
Item Number
Page
 
Item Number
Page
PART I. FINANCIAL INFORMATION
 
 
PART I (CONTINUED)
 
1
Unaudited Consolidated Financial Statements of Ambac Financial Group, Inc. and Subsidiaries
 
 
3
 
 
4
 
 
 
 
 
 
 
PART II. OTHER INFORMATION
 
 
 
1
 
 
1A
2
 
2
 
 
3
 
 
6
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 



PART I.    FINANCIAL INFORMATION
Item 1.     Unaudited Financial Statements of Ambac Financial Group, Inc. and Subsidiaries
AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES
Consolidated Balance Sheets
 
September 30,
 
December 31,
(Dollars in thousands, except share data) (September 30, 2019 (Unaudited))
2019
 
2018
Assets:
 
 
 
Investments:
 
 
 
Fixed income securities, at fair value (amortized cost of $2,561,278 and $3,020,744)
$
2,727,305

 
$
3,115,675

Fixed income securities pledged as collateral, at fair value (amortized cost of $84,948 and $0)
84,948

 
—

Short-term investments, at fair value (amortized cost of $664,423 and $430,405)
664,441

 
430,331

Other investments (includes $418,140 and $351,049 at fair value)
462,427

 
391,217

Total investments
3,939,121

 
3,937,223

Cash and cash equivalents
51,951

 
63,089

Restricted cash
12,561

 
19,405

Premium receivables
414,744

 
495,391

Reinsurance recoverable on paid and unpaid losses
26,036

 
23,133

Deferred ceded premium
76,495

 
61,134

Subrogation recoverable
2,082,268

 
1,932,960

Derivative assets
82,162

 
59,468

Current taxes
19,663

 
47,040

Insurance intangible asset
433,524

 
718,931

Other assets
113,189

 
137,628

Variable interest entity assets:
 
 
 
Fixed income securities, at fair value
3,158,608

 
2,737,286

Restricted cash
3,168

 
999

Loans, at fair value
2,965,539

 
4,287,664

Derivative assets
67,921

 
66,302

Other assets
4,154

 
1,058

Total assets
$
13,451,104

 
$
14,588,711

Liabilities and Stockholders’ Equity:
 
 
 
Liabilities:
 
 
 
Unearned premiums
$
527,771

 
$
629,971

Loss and loss expense reserves
1,522,304

 
1,826,078

Ceded premiums payable
29,950

 
32,913

Deferred taxes
30,150

 
40,130

Long-term debt
2,954,929

 
2,928,929

Accrued interest payable
423,815

 
375,808

Derivative liabilities
103,314

 
76,699

Other liabilities
95,267

 
63,792

Variable interest entity liabilities:
 
 
 
Accrued interest payable
2,656

 
556

Long-term debt (includes $4,151,433 and $5,268,596 at fair value)
4,353,171

 
5,268,596

Derivative liabilities
1,779,077

 
1,712,062

Other liabilities
36

 
30

Total liabilities
11,822,440

 
12,955,564

Commitments and contingencies (See Note 12)
 
 
 
Stockholders’ equity:
 
 
 
Preferred stock, par value $0.01 per share; 20,000,000 shares authorized shares; issued and outstanding shares—none
—

 
—

Common stock, par value $0.01 per share; 130,000,000 shares authorized; issued shares: 45,571,743 and 45,365,170
456

 
454

Additional paid-in capital
229,128

 
219,429

Accumulated other comprehensive income (loss)
26,407

 
(48,715
)
Retained earnings
1,313,052

 
1,421,302

Treasury stock, shares at cost: 20,483 and 28,892
(347
)
 
(473
)
Total Ambac Financial Group, Inc. stockholders’ equity
1,568,696

 
1,591,997

Noncontrolling interest
59,968

 
41,150

Total stockholders’ equity
1,628,664

 
1,633,147

Total liabilities and stockholders’ equity
$
13,451,104

 
$
14,588,711

See accompanying Notes to Unaudited Consolidated Financial Statements


| Ambac Financial Group, Inc. 1 2019 Third Quarter FORM 10-Q |


AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES
Consolidated Statements of Total Comprehensive Income (Loss) (Unaudited)
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
(Dollars in thousands, except share data)
 
2019
 
2018
 
2019
 
2018
Revenues:
 
 
 
 
 
 
 
 
Net premiums earned
 
$
10,466

 
$
25,640

 
$
46,057

 
82,359

Net investment income
 
44,537

 
58,332

 
185,838

 
235,234

Other-than-temporary impairment losses:
 
 
 
 
 
 
 
 
Total other-than-temporary impairment losses
 
(42
)
 
(266
)
 
(71
)
 
(1,617
)
Portion of other-than-temporary impairment recognized in other comprehensive income
 
—

 
—

 
—

 
38

Net other-than-temporary impairment losses recognized in earnings
 
(42
)
 
(266
)
 
(71
)
 
(1,579
)
Net realized investment gains (losses)
 
18,471

 
30,201

 
71,564

 
82,211

Net gains (losses) on derivative contracts
 
(9,890
)
 
17,583

 
(61,461
)
 
51,706

Net realized gains (losses) on extinguishment of debt
 
—

 
—

 
—

 
3,121

Other income
 
141,376

 
694

 
133,270

 
2,676

Income (loss) on variable interest entities
 
11,244

 
1,831

 
30,459

 
2,982

Total revenues
 
216,162

 
134,015

 
405,656

 
458,710

Expenses:
 
 
 
 
 
 
 
 
Losses and loss expenses (benefit)
 
37,139

 
33,501

 
(83,934
)
 
(181,315
)
Insurance intangible amortization
 
17,421

 
26,421

 
279,941

 
78,299

Operating expenses
 
25,622

 
28,368

 
79,627

 
90,865

Interest expense
 
66,925

 
65,673

 
202,284

 
176,192

Total expenses
 
147,107

 
153,963

 
477,918

 
164,041

Pre-tax income (loss)
 
69,055

 
(19,948
)
 
(72,262
)
 
294,669

Provision for income taxes
 
2,939

 
2,211

 
33,252

 
6,811

Net income (loss)
 
66,116

 
(22,159
)
 
(105,514
)
 
287,858

Less: loss on exchange of auction market preferred shares
 
—

 
81,686

 
—

 
81,686

Net income (loss) attributable to common stockholders
 
$
66,116

 
$
(103,845
)
 
$
(105,514
)
 
$
206,172

Other comprehensive income (loss), after tax:
 
 
 
 
 
 
 
 
Net income (loss)
 
$
66,116

 
$
(22,159
)
 
$
(105,514
)
 
$
287,858

Unrealized gains (losses) on securities, net of income tax provision (benefit) of $777, $(625), $(6,827) and $(1,211)
 
31,285

 
60,807

 
102,686

 
183,686

Gains (losses) on foreign currency translation, net of income tax provision (benefit) of $0, $0, $0 and $0
 
(23,570
)
 
(8,873
)
 
(27,532
)
 
(29,806
)
Credit risk changes of fair value option liabilities, net of income tax provision (benefit) of $(15), $40, $50 and $82
 
(74
)
 
340

 
245

 
548

Changes to postretirement benefit, net of income tax provision (benefit) of $0, $0, $0 and $0
 
(322
)
 
(303
)
 
(277
)
 
(1,464
)
Total other comprehensive income, net of income tax
 
7,319

 
51,971

 
75,122

 
152,964

Less: loss on exchange of auction market preferred shares
 
—

 
81,686

 
—

 
81,686

Total comprehensive income (loss) attributable to common stockholders
 
$
73,435

 
$
(51,874
)
 
$
(30,392
)
 
$
359,136

Net income (loss) per share attributable to common stockholders:
 
 
 
 
 
 
 
 
Basic
 
$
1.44

 
$
(2.27
)
 
$
(2.30
)
 
$
4.52

Diluted
 
$
1.41

 
$
(2.27
)
 
$
(2.30
)
 
$
4.43

Weighted average number of common shares outstanding:
 
 
 
 
 
 
 
 
Basic
 
45,997,694

 
45,749,252

 
45,939,284

 
45,635,483

Diluted
 
47,020,058

 
45,749,252

 
45,939,284

 
46,510,795

See accompanying Notes to Unaudited Consolidated Financial Statements


| Ambac Financial Group, Inc. 2 2019 Third Quarter FORM 10-Q |


AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES
Consolidated Statements of Stockholders’ Equity (Unaudited)
 
 
 
Ambac Financial Group, Inc.
 
 
(Dollars in thousands)
Total
 
Retained
Earnings
 
Accumulated
Other
Comprehensive
Income (Loss)
 
Preferred
Stock
 
Common
Stock
 
Additional Paid-in
Capital
 
Common
Stock Held
in Treasury,
at Cost
 
Noncontrolling
Interest
Balance at June 30, 2019
$
1,552,916

 
$
1,246,990

 
$
19,088

 
$
—

 
$
456

 
$
226,794

 
$
(380
)
 
$
59,968

Total comprehensive income
73,435

 
66,116