10-Q 1 clh-20230930.htm 10-Q clh-20230930
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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 ENDEDSEPTEMBER 30, 2023
OR
TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

FOR THE TRANSITION PERIOD FROM         TO       

Commission File Number 001-34223
_______________________
CLEAN HARBORS, INC.
(Exact name of registrant as specified in its charter)
Massachusetts04-2997780
(State or Other Jurisdiction of Incorporation or Organization)(IRS Employer Identification No.)
42 Longwater DriveNorwellMA02061-9149
(Address of Principal Executive Offices)(Zip Code)
Registrant’s Telephone Number, Including area code: (781) 792-5000
Securities registered pursuant to Section 12(b) of the Act:
Title of each classTrading SymbolName of each exchange on which registered
Common Stock, $0.01 par valueCLHNew York Stock Exchange
    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 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, a smaller reporting company, or an emerging growth company. See the definitions 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 filerAccelerated filer
Non-accelerated filerSmaller 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 by Rule 12b-2 of the Exchange Act). Yes   No 
The number of shares of Common Stock, $0.01 par value, of the registrant outstanding at October 27, 2023 was 54,086,261.



CLEAN HARBORS, INC.
QUARTERLY REPORT ON FORM 10-Q
TABLE OF CONTENTS
Page No.




CLEAN HARBORS, INC. AND SUBSIDIARIES
CONSOLIDATED BALANCE SHEETS
(in thousands)
September 30, 2023December 31, 2022
ASSETS(unaudited)
Current assets:
Cash and cash equivalents$335,965 $492,603 
Short-term marketable securities84,007 62,033 
Accounts receivable, net of allowances aggregating $42,342 and $45,253, respectively
1,010,335 964,603 
Unbilled accounts receivable130,888 107,010 
Inventories and supplies311,512 324,994 
Prepaid expenses and other current assets78,045 82,518 
Total current assets1,950,752 2,033,761 
Property, plant and equipment, net2,128,508 1,980,302 
Other assets:
Operating lease right-of-use assets188,695 166,181 
Goodwill1,286,473 1,246,878 
Permits and other intangibles, net613,540 620,782 
Other80,211 81,803 
Total other assets2,168,919 2,115,644 
Total assets$6,248,179 $6,129,707 
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
Current portion of long-term debt$10,000 $10,000 
Accounts payable414,963 446,629 
Deferred revenue102,468 94,094 
Accrued expenses and other current liabilities369,097 396,716 
Current portion of closure, post-closure and remedial liabilities21,759 23,123 
Current portion of operating lease liabilities57,100 49,532 
Total current liabilities975,387 1,020,094 
Other liabilities:
Closure and post-closure liabilities, less current portion of $11,425 and $13,205, respectively
108,466 105,596 
Remedial liabilities, less current portion of $10,334 and $9,918, respectively
101,370 106,372 
Long-term debt, less current portion2,292,952 2,414,828 
Operating lease liabilities, less current portion133,163 119,259 
Deferred tax liabilities347,628 350,389 
Other long-term liabilities103,419 90,847 
Total other liabilities3,086,998 3,187,291 
Commitments and contingent liabilities (See Note 16)
Stockholders’ equity:
Common stock, $0.01 par value:
Authorized 80,000,000 shares; issued and outstanding 54,102,982 and 54,064,797 shares, respectively
541 541 
Additional paid-in capital490,163 504,240 
Accumulated other comprehensive loss(169,139)(167,181)
Accumulated earnings1,864,229 1,584,722 
Total stockholders’ equity2,185,794 1,922,322 
Total liabilities and stockholders’ equity$6,248,179 $6,129,707 

The accompanying notes are an integral part of these unaudited consolidated financial statements.
1

CLEAN HARBORS, INC. AND SUBSIDIARIES
UNAUDITED CONSOLIDATED STATEMENTS OF OPERATIONS
(in thousands, except per share amounts)
Three Months EndedNine Months Ended
September 30,September 30,
2023202220232022
Revenues:
Service revenues$1,129,216 $1,073,810 $3,341,539 $3,100,914 
Product revenues236,480 289,276 729,444 787,593 
Total revenues1,365,696 1,363,086 4,070,983 3,888,507 
Cost of revenues: (exclusive of items shown separately below)
Service revenues765,004 738,041 2,288,199 2,168,025 
Product revenues178,947 172,607 534,778 484,481 
Total cost of revenues943,951 910,648 2,822,977 2,652,506 
Selling, general and administrative expenses171,019 151,711 505,154 458,492 
Accretion of environmental liabilities3,388 3,246 10,281 9,599 
Depreciation and amortization92,970 88,394 267,425 260,560 
Income from operations154,368 209,087 465,146 507,350 
Other income (expense), net334 104 (833)2,073 
Loss on early extinguishment of debt  (2,362) 
Gain on sale of business   8,864 
Interest expense, net of interest income of $2,877, $1,103, $7,833 and $2,159, respectively
(29,696)(28,081)(80,400)(79,354)
Income before provision for income taxes125,006 181,110 381,551 438,933 
Provision for income taxes33,666 45,311 102,044 109,663 
Net income$91,340 $135,799 $279,507 $329,270 
Earnings per share:
Basic$1.69 $2.51 $5.17 $6.07 
Diluted$1.68 $2.50 $5.14 $6.04 
Shares used to compute earnings per share - Basic54,122 54,111 54,097 54,278 
Shares used to compute earnings per share - Diluted54,419 54,381 54,411 54,542 
    

The accompanying notes are an integral part of these unaudited consolidated financial statements.
2

CLEAN HARBORS, INC. AND SUBSIDIARIES
UNAUDITED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
(in thousands)
 Three Months EndedNine Months Ended
September 30,September 30,
 2023202220232022
Net income$91,340 $135,799 $279,507 $329,270 
Other comprehensive (loss) income, net of tax:
Unrealized gain (loss) on available-for-sale securities93 (36)311 (692)
Unrealized gain on fair value of interest rate hedges7,801 23,750 15,528 59,674 
Reclassification adjustment for interest rate hedge amounts realized in net income(3,650)(1,296)(12,704)4,062 
Reclassification adjustment for settlement of interest rate hedges  (5,905) 
Unfunded pension liability6 40 (1)50 
Foreign currency translation adjustments(7,423)(31,323)813 (38,649)
Other comprehensive (loss) income, net of tax(3,173)(8,865)(1,958)24,445 
Comprehensive income$88,167 $126,934 $277,549 $353,715 

The accompanying notes are an integral part of these unaudited consolidated financial statements.
3

CLEAN HARBORS, INC. AND SUBSIDIARIES
UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS
(in thousands)
Nine Months Ended
September 30,
20232022
Cash flows from operating activities:
Net income$279,507 $329,270 
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization267,425 260,560 
Allowance for doubtful accounts2,620 6,684 
Amortization of deferred financing costs and debt discount4,036 4,734 
Accretion of environmental liabilities10,281 9,599 
Changes in environmental liability estimates3,258 2,105 
Deferred income taxes(356)2,226 
Other expense (income), net833 (2,073)
Stock-based compensation14,809 20,375 
Loss on early extinguishment of debt2,362  
Gain on sale of business (8,864)
Environmental expenditures(24,064)(9,720)
Changes in assets and liabilities, net of acquisitions:
Accounts receivable and unbilled accounts receivable(46,445)(293,562)
Inventories and supplies12,691 (44,324)
Other current and non-current assets(18,190)(12,600)
Accounts payable(40,013)52,979 
Other current and long-term liabilities(13,062)40,153 
Net cash from operating activities455,692 357,542 
Cash flows used in investing activities:
Additions to property, plant and equipment(311,906)(244,547)
Proceeds from sale and disposal of fixed assets5,129 5,118 
Acquisitions, net of cash acquired(119,596)(73,568)
Proceeds from sale of business, net of transaction costs750 16,811 
Additions to intangible assets including costs to obtain or renew permits(1,507)(1,094)
Purchases of available-for-sale securities(104,329)(36,418)
Proceeds from sale of available-for-sale securities84,390 51,736 
Net cash used in investing activities(447,069)(281,962)
Cash flows used in financing activities:
Change in uncashed checks3,004 887 
Tax payments related to withholdings on vested restricted stock(10,886)(6,214)
Repurchases of common stock(18,000)(44,182)
Deferred financing costs paid(6,371)(410)
Payments on finance leases(11,594)(9,538)
Principal payments on debt(621,475)(13,152)
Proceeds from issuance of debt500,000  
Borrowing from revolving credit facility114,000  
Payment on revolving credit facility(114,000) 
Net cash used in financing activities(165,322)(72,609)
Effect of exchange rate change on cash61 (6,523)
Decrease in cash and cash equivalents(156,638)(3,552)
Cash and cash equivalents, beginning of period492,603 452,575 
Cash and cash equivalents, end of period$335,965 $449,023 
Supplemental information:
Cash payments for interest and income taxes:
Interest paid$100,813 $86,407 
Income taxes paid, net of refunds107,328 53,183 
Non-cash investing activities:
Property, plant and equipment accrued29,127 23,726 
Remedial liability assumed in acquisition of property, plant and equipment 8,092 
ROU assets obtained in exchange for operating lease liabilities61,741 39,899 
ROU assets obtained in exchange for finance lease liabilities26,317 11,263 
The accompanying notes are an integral part of these unaudited consolidated financial statements.
4

CLEAN HARBORS, INC. AND SUBSIDIARIES
UNAUDITED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY
(in thousands)
Common StockAccumulated
Other
Comprehensive Loss
Number
of
Shares
$0.01
Par
Value
Additional
Paid-in
Capital
Accumulated
Earnings
Total
Stockholders’
Equity
Balance at January 1, 202354,065 $541 $504,240 $(167,181)$1,584,722 $1,922,322 
Net income— — — — 72,401 72,401 
Other comprehensive loss— — — (14,346)— (14,346)
Stock-based compensation— — 6,018 — — 6,018 
Issuance of common stock for restricted share vesting, net of employee tax withholdings49 — (3,351)— — (3,351)
Repurchases of common stock(22)— (3,000)— — (3,000)
Balance at March 31, 202354,092 541 503,907 (181,527)1,657,123 1,980,044 
Net income— — — — 115,766 115,766 
Other comprehensive income— — — 15,561 — 15,561 
Stock-based compensation— — 4,500 — — 4,500 
Issuance of common stock for restricted share vesting, net of employee tax withholdings34 — (984)— — (984)
Repurchases of common stock(36)— (5,001)— — (5,001)
Balance at June 30, 202354,090 541 502,422 (165,966)1,772,889 2,109,886 
Net income— — — — 91,340 91,340 
Other comprehensive loss— — — (3,173)— (3,173)
Stock-based compensation— — 4,291 — — 4,291 
Issuance of common stock for restricted share vesting, net of employee tax withholdings71 1 (6,552)— — (6,551)
Repurchases of common stock(58)(1)(9,998)— — (9,999)
Balance at September 30, 202354,103 $541 $490,163 $(169,139)$1,864,229 $2,185,794 




















5

CLEAN HARBORS, INC. AND SUBSIDIARIES
UNAUDITED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY (CONTINUED)
(in thousands)
Common StockAccumulated
Other
Comprehensive Loss
Number
of
Shares
$0.01
Par
Value
Additional
Paid-in
Capital
Accumulated
Earnings
Total
Stockholders’
Equity
Balance at January 1, 202254,419 $544 $536,377 $(196,012)$1,172,978 $1,513,887 
Net income— — — — 45,314 45,314 
Other comprehensive income— — — 33,849 — 33,849 
Stock-based compensation— — 5,712 — — 5,712 
Issuance of common stock for restricted share vesting, net of employee tax withholdings36 — (1,831)— — (1,831)
Repurchases of common stock(41)— (3,694)— — (3,694)
Balance at March 31, 202254,414 544 536,564 (162,163)1,218,292 1,593,237 
Net income— — — — 148,157 148,157 
Other comprehensive loss— — — (539)— (539)
Stock-based compensation— — 6,835 — — 6,835 
Issuance of common stock for restricted share vesting, net of employee tax withholdings31 — (740)— — (740)
Repurchases of common stock(335)(3)(29,997)— — (30,000)
Balance at June 30, 202254,110 541 512,662 (162,702)1,366,449 1,716,950 
Net income— — — — 135,799 135,799 
Other comprehensive loss— — — (8,865)— (8,865)
Stock-based compensation— — 7,828 — — 7,828 
Issuance of common stock for restricted share vesting, net of employee tax withholdings68 1 (3,644)— — (3,643)
Repurchases of common stock(108)(1)(10,487)— — (10,488)
Balance at September 30, 202254,070 $541 $506,359 $(171,567)$1,502,248 $1,837,581 

The accompanying notes are an integral part of these unaudited consolidated financial statements.
6

CLEAN HARBORS, INC. AND SUBSIDIARIES
NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(1) BASIS OF PRESENTATION
The accompanying consolidated interim financial statements are unaudited and include the accounts of Clean Harbors, Inc. and its subsidiaries (collectively, “Clean Harbors” or the “Company”) and have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission and, in the opinion of management, include all adjustments which are of a normal recurring nature and are necessary for a fair presentation of the financial position, results of operations and cash flows for the periods presented. Management has made estimates and assumptions affecting the amounts reported in the Company's consolidated interim financial statements and accompanying footnotes; actual results could differ from those estimates and judgments. The results for interim periods are not necessarily indicative of results for the entire year or any other interim periods. The financial statements presented herein should be read in conjunction with the financial statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2022.

(2) SIGNIFICANT ACCOUNTING POLICIES
The Company's significant accounting policies are described in Note 2, "Significant Accounting Policies," in the Company's Annual Report on Form 10-K for the year ended December 31, 2022. There have been no material changes in these policies or their application except for the change described below.
Segment Reporting and Goodwill
Pursuant to the previous succession announcement, effective March 31, 2023, Michael L. Battles and Eric W. Gerstenberg, former Chief Financial Officer and Chief Operating Officer of the Company, respectively, were appointed Co-CEOs. As a result, the Company’s new Chief Operating Decision Maker (“CODM”) is a committee comprised of both Co-CEOs, who, going forward, will manage the business, make operating decisions and assess performance. The Company does not expect that the new CODM structure will change how the Company is managed and as such will continue to report as two operating segments; (i) the Environmental Services segment and (ii) the Safety-Kleen Sustainability Solutions segment and assess the recoverability of goodwill under three reporting units; (i) Environmental Sales and Service, (ii) Environmental Facilities and (iii) Safety-Kleen Sustainability Solutions.

(3) REVENUES
The Company generates revenues through the following operating segments: Environmental Services and Safety-Kleen Sustainability Solutions. The Company's Environmental Services operating segment generally has four sources of revenue and the Safety-Kleen Sustainability Solutions operating segment has two sources of revenue. The Company disaggregates third-party revenues by geographic location and source of revenue as management believes these categories depict how revenue and cash flows are affected by economic factors. The Company's significant sources of revenue include:
Technical Services—Technical Services contribute to the revenues of the Environmental Services operating segment. Revenues for these services are generated from fees charged for waste material management and disposal services including onsite environmental management services, collection and transportation, packaging, recycling, treatment and disposal of waste and large remediation projects. Revenue is primarily generated by short-term projects, most of which are governed by master service agreements that are long-term in nature. These master service agreements are typically entered into with the Company's larger customers and outline the pricing and legal frameworks for such arrangements. Services are provided based on purchase orders or agreements with the customer and include prices based upon units of volume of waste, material and personnel costs as well as transportation and other fees. Collection and transportation revenues are recognized over time, as the customer receives and consumes the benefits of the services as they are being performed and the Company has a right to payment for performance completed to date. The Company uses the input method to recognize revenue over time, based on time and materials incurred as a basis for measuring the satisfaction of the performance obligation. Revenues for treatment and disposal of waste are recognized upon completion of treatment, final disposition in a landfill or incinerator, or when the waste is shipped to a third-party for processing and disposal. The Company periodically enters into bundled arrangements for the collection and transportation and disposal of waste. For such arrangements, transportation and disposal are considered distinct performance obligations and the Company allocates revenue to each based on the relative standalone selling price (i.e., the estimated price that a customer would pay for the services on a standalone basis). Revenues and the related costs from waste that is not yet completely processed and disposed of are deferred. The deferred revenues and costs are recognized when the services are completed. The period between collection and transportation and the final processing and disposal ranges depending on the location of the customer, but generally is measured in days.
7

Industrial Services and Other—Industrial Services contribute to the revenues of the Environmental Services operating segment. These revenues are primarily generated from industrial and specialty services provided to refineries, chemical plants, manufacturing facilities, power generation companies, pulp and paper mills, mines and other industrial customers throughout North America. Services include in-plant cleaning and maintenance services, plant outage and turnaround services, specialty cleaning services including chemical cleaning, pigging and high and ultra-high pressure water cleaning, leak detection and repair, daylighting, production services and upstream energy services. Services are provided based on purchase orders or agreements with the customer and include prices based upon daily, hourly or job rates for equipment, materials and personnel. The Company recognizes revenue for these services over time, as the customer receives and consumes the benefits of the services as they are being performed and the Company has a right to payment for performance completed to date. The Company uses the input method to recognize revenue over time, based on time and materials incurred.
Field and Emergency Response Services—Field and Emergency Response Services contribute to the revenues of the Environmental Services operating segment. Field Services revenues are generated from cleanup services at customer sites, including those managed by municipalities and utility providers, or other locations on a scheduled or emergency response basis. Services include confined space entry for tank cleaning, site decontamination, remediation, railcar cleaning, manhole/vault clean outs, product recovery and transfer and vacuum services. Additional services include filtration and water treatment services. Response services for environmental emergencies of any scale range from man-made disasters such as oil spills to natural disasters like hurricanes. Emergency response services also include spill cleanup on land and water, as well as contagion disinfection, decontamination and disposal services. Field and emergency response services are provided based on purchase orders or agreements with customers and include prices generally based upon daily, hourly or job rates for equipment, materials and personnel. The Company recognizes revenue for these services over time, as the customer receives and consumes the benefits of the services as they are being performed and the Company has a right to payment for performance completed to date. The Company uses the input method to recognize revenue over time, based on time and materials incurred. The duration of such services can be over a number of hours, several days or even months for larger scale projects.
Safety-Kleen Environmental Services—Safety-Kleen Environmental Services revenues contribute both to the Environmental Services operating segment and the Safety-Kleen Sustainability Solutions operating segment depending upon the nature of such revenues and operating responsibilities relative to executing the revenue contracts. Revenues from providing containerized waste handling and disposal services, parts washer services and vacuum services, referred to collectively as the Safety-Kleen branches' core service offerings, contribute to the revenues of the Environmental Services operating segment. In addition, sales of packaged blended oil products and other complementary product sales contribute to the revenues of the Environmental Services operating segment. Revenues generated from waste oil, anti-freeze and oil filter collection services, sales of bulk blended oil products and sales of bulk automotive fluids contribute to the Safety-Kleen Sustainability Solutions operating segment.
Generally, the revenue from services is recognized over time, as the customer receives and consumes the benefits of the services as they are being performed and the Company has a right to payment for performance completed to date. The duration of such services can be over a number of hours or several days. The Company uses the input method to recognize revenue over time, based on time and materials incurred. Product revenue is recognized upon the transfer of control whereby control transfers when the products are delivered to the customer. Containerized waste services consist of profiling, collecting, transporting and recycling or disposing of a wide variety of waste. Related collection and transportation revenues are recognized over time, as the customer receives and consumes the benefits of the services as they are being performed and the Company has a right to payment for performance completed to date. Parts washer services include customer use of the Company's parts washer equipment, cleaning and maintenance of the parts washer equipment and removal and replacement of used cleaning fluids. Parts washer services are considered a single performance obligation due to the highly integrated and interdependent nature of the arrangement. Revenue from parts washer services is recognized over the service interval as the customer receives the benefit of the services.
Safety-Kleen Oil—Safety-Kleen Oil related sales contribute to the revenues of the Safety-Kleen Sustainability Solutions segment. These revenues are generated from sales of high-quality base and blended lubricating oils to third-party distributors, government agencies, fleets, railroads and industrial customers. The business also sells recycled fuel oil to asphalt plants, industrial plants and pulp and paper companies. The used oil is also processed into vacuum gas oil which can be further re-refined into lubricant base oils or sold directly into the marine diesel oil fuel market. Revenue for oil products is recognized at a point in time, upon the transfer of control. Control transfers when the products are delivered to the customer.
8

The following tables present the Company's third-party revenue disaggregated by source of revenue and geography (in thousands):
For the Three Months Ended September 30, 2023
Environmental ServicesSafety-Kleen Sustainability SolutionsCorporateTotal
Primary Geographical Markets
United States$1,017,224 $206,860 $112 $1,224,196 
Canada118,055 23,445  141,500 
Total third-party revenues$1,135,279 $230,305 $112 $1,365,696 
Sources of Revenue
Technical Services$403,889 $ $ $403,889 
Industrial Services and Other
350,251  112 350,363 
Field and Emergency Response Services155,046   155,046 
Safety-Kleen Environmental Services226,093 59,458  285,551 
Safety-Kleen Oil 170,847  170,847 
Total third-party revenues$1,135,279 $230,305 $112 $1,365,696 

For the Three Months Ended September 30, 2022
Environmental ServicesSafety-Kleen Sustainability SolutionsCorporateTotal
Primary Geographical Markets
United States$960,737 $249,035 $283 $1,210,055 
Canada119,295 33,736  153,031 
Total third-party revenues$1,080,032 $282,771 $283 $1,363,086 
Sources of Revenue
Technical Services$398,664 $ $ $398,664 
Industrial Services and Other332,025  283 332,308 
Field and Emergency Response Services150,031   150,031 
Safety-Kleen Environmental Services199,312 52,072  251,384 
Safety-Kleen Oil 230,699  230,699 
Total third-party revenues$1,080,032 $282,771 $283 $1,363,086 

For the Nine Months Ended September 30, 2023
Environmental ServicesSafety-Kleen Sustainability SolutionsCorporateTotal
Primary Geographical Markets
United States$3,017,547 $641,625 $335 $3,659,507 
Canada340,196 71,280  411,476 
Total third-party revenues$3,357,743 $712,905 $335 $4,070,983 
Sources of Revenue
Technical Services$1,160,306 $ $ $1,160,306 
Industrial Services and Other
1,086,175  335 1,086,510 
Field and Emergency Response Services457,491   457,491 
Safety-Kleen Environmental Services653,771 171,469  825,240 
Safety-Kleen Oil 541,436  541,436 
Total third-party revenues$3,357,743 $712,905 $335 $4,070,983 
9

For the Nine Months Ended September 30, 2022
Environmental ServicesSafety-Kleen Sustainability SolutionsCorporateTotal
Primary Geographical Markets
United States$2,740,994 $688,444 $434 $3,429,872 
Canada364,342 94,293  458,635 
Total third-party revenues$3,105,336 $782,737 $434 $3,888,507 
Sources of Revenue
Technical Services$1,109,339 $ $ $1,109,339 
Industrial Services and Other1,001,733  434 1,002,167 
Field and Emergency Response Services427,250   427,250 
Safety-Kleen Environmental Services567,014 145,841  712,855 
Safety-Kleen Oil 636,896  636,896 
Total third-party revenues$3,105,336 $782,737 $434 $3,888,507 
Contract Balances
(in thousands)September 30, 2023December 31, 2022
Receivables$1,010,335 $964,603 
Contract assets (unbilled receivables)130,888 107,010 
Contract liabilities (deferred revenue)102,468 94,094 

The timing of revenue recognition, billings and cash collections results in billed accounts receivable, unbilled receivables (contract assets) and customer advances and deposits or deferred revenue (contract liabilities) on the consolidated balance sheet. Generally, billing occurs subsequent to revenue recognition, as a right to payment is not just subject to passage of time, resulting in contract assets, which are generally classified as current. The Company sometimes receives advances or deposits from its customers before revenue is recognized, resulting in contract liabilities. These assets and liabilities are reported on the consolidated balance sheet on a contract-by-contract basis at the end of each reporting period. The contract liability balances at the beginning of each period presented were generally fully recognized in the subsequent three-month period.

(4) BUSINESS COMBINATIONS
2023 Acquisition
On March 31, 2023, the Company acquired Thompson Industrial Services, LLC ("Thompson Industrial") for an all-cash purchase price of $110.9 million, net of cash acquired. In the third quarter of 2023, the Company received $1.0 million after finalizing the acquisition date working capital balances, which decreased the overall purchase price. The operations of Thompson Industrial expand the Environmental Services segment's industrial service operations in the southeastern region of the United States.
The preliminary allocation of the purchase price is provisional and was based on estimates of the fair value of assets acquired and liabilities assumed as of the acquisition date. The Company continues to obtain information to complete the valuation of these balances and the associated income tax accounting. Measurement period adjustments will reflect new information obtained
10

about facts and circumstances that existed as of the acquisition date. The following table summarizes the preliminary determination and recognition of assets acquired and liabilities assumed (in thousands):
At Acquisition Date As Reported March 31, 2023Measurement Period Adjustments
At Acquisition Date
As Reported September 30, 2023
Accounts receivable$25,793 $(450)$25,343 
Inventories and supplies233 — 233 
Prepaid expenses and other current assets1,150 155 1,305 
Property, plant and equipment28,030 (1,311)26,719 
Permits and other intangibles28,100 800 28,900 
Operating lease right-of-use assets4,716 — 4,716 
Other non-current assets36 36 72 
Current liabilities(11,514)1,269 (10,245)
Current portion of operating lease liabilities(1,653)— (1,653)
Operating lease liabilities, less current portion(3,063)— (3,063)
Other long-term liabilities (560)(560)
Total identifiable net assets71,828 (61)71,767 
Goodwill40,092 (1,004)39,088 
Total purchase price$111,920 $(1,065)$110,855 
Permits and other intangible assets acquired include customer relationships, trademarks/tradenames and non-compete agreements and are anticipated to have estimated useful lives of between five and 15 years with a weighted average useful life of approximately 13 years. The excess of the total purchase price, which includes the aggregate cash consideration paid in excess of the fair value of the tangible and intangible assets acquired and liabilities assumed, was recorded as goodwill. The goodwill recognized is attributable to the expected operating synergies, assembled workforce and growth potential that the Company expects to realize from the acquisition. Goodwill generated from the acquisition is deductible for tax purposes.
The operations included in the Company's financial statements for the three and nine months ended September 30, 2023, and pro forma revenue and earnings amounts on a combined basis as if this acquisition had been completed on January 1, 2022 are immaterial to the consolidated financial statements of the Company.
2022 Acquisitions
On June 17, 2022, the Company acquired a privately-owned company for an all-cash purchase price of approximately $78.9 million, net of cash acquired. The operations of the newly acquired company expand the Safety-Kleen Sustainability Solutions segment's waste oil collection capabilities and re-refining business throughout the southeastern region of the United States, including the addition of a re-refinery in Georgia.
11

The Company finalized the purchase accounting for this acquisition. The allocation of the purchase price was based on estimates of the fair value and assets acquired and liabilities assumed as of June 17, 2022. The following table summarizes the final determination and recognition of assets acquired and liabilities assumed (in thousands):
At Acquisition Date As Reported December 31, 2022Measurement Period Adjustments
Final Allocation At Acquisition Date As Reported September 30, 2023
Accounts receivable$1,111 $(22)$1,089 
Inventories and supplies5,816 (71)5,745 
Prepaid expenses and other current assets144 — 144 
Property, plant and equipment19,605 2,626 22,231 
Permits and other intangibles23,500 — 23,500 
Operating lease right-of-use assets585 — 585 
Other non-current assets13 — 13 
Current liabilities(3,271)(104)(3,375)
Current portion of operating lease liabilities(186)— (186)
Operating lease liabilities, less current portion(399)— (399)
Other long-term liabilities(55)(2,626)(2,681)
Total identifiable net assets46,863 (197)46,666 
Goodwill32,015 197 32,212 
Total purchase price$78,878 $ $78,878 
Permits and other intangible assets acquired include supplier relationships, permits, customer relationships and trademarks/tradenames and are anticipated to have estimated useful lives of between five and 20 years with a weighted average useful life of approximately 18 years. The excess of the total purchase price, which includes the aggregate cash consideration paid in excess of the fair value of the tangible and intangible assets acquired, was recorded as goodwill. The goodwill recognized is attributable to the expected operating synergies, assembled workforce and growth potential that the Company expects to realize from the acquisition. Goodwill generated from the acquisition is deductible for tax purposes.
On December 9, 2022, the Company acquired a privately-owned business for $12.6 million cash consideration. The acquired company expands the Safety-Kleen Sustainability Solutions segment's oil collection operations in the southeastern region of the United States. In connection with this acquisition, goodwill of $2.6 million was recognized. The results of operations for the acquired business were not material in 2022.

(5) DISPOSITION OF BUSINESS
On June 30, 2022, the Company completed the sale of a line of business as part of its continuous focus on divesting certain non-core operations. The divested line of business was previously included within the Environmental Sales & Service reporting unit of the Environmental Services segment. The Company determined that the disposition did not constitute a strategic shift and that the impact on the Company's overall operations and financial results is not be material. Accordingly, the operations associated with the disposal were not reported in discontinued operations. The final purchase price for the line of business was $18.8 million, after settling working capital. The gain on sale of $8.9 million, after accounting for the assets sold, liabilities transferred upon sale and transaction costs, was included in gain on sale of business in the Company's consolidated statement of operations for the nine months ended September 30, 2022.

12

(6) INVENTORIES AND SUPPLIES
Inventories and supplies consisted of the following (in thousands):
September 30, 2023December 31, 2022
Oil and oil related products$109,345 $151,519 
Supplies170,512 143,743 
Solvent and solutions11,519 11,994 
Other20,136 17,738 
Total inventories and supplies$311,512 $324,994 
Supplies inventories consist primarily of critical spare parts to support the Company's incinerator and re-refinery operations and other general supplies used in our normal day-to-day operations. Other inventories consist primarily of parts washer components, cleaning fluids, absorbents and automotive fluids, such as windshield washer fluid and antifreeze.

(7) PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment consisted of the following (in thousands):
September 30, 2023December 31, 2022
Land$174,598 $172,579 
Asset retirement costs (non-landfill)27,100 22,001 
Landfill assets247,822 232,872 
Buildings and improvements (1)
622,059 591,397 
Vehicles (2)
1,214,945 1,112,188 
Equipment (3)
2,343,272 2,195,064 
Construction in progress191,311 140,328 
4,821,107 4,466,429 
Less - accumulated depreciation and amortization2,692,599 2,486,127 
Total property, plant and equipment, net$2,128,508 $1,980,302 
________________
(1) Balances inclusive of gross right-of-use ("ROU") assets classified as finance leases of $8.0 million in both periods.
(2) Balances inclusive of gross ROU assets classified as finance leases of $132.5 million and $106.7 million, respectively.
(3) Balances inclusive of gross ROU assets classified as finance leases of $9.2 million in both periods.
Depreciation expense, inclusive of landfill and finance lease amortization, was $80.4 million and $229.7 million for the three and nine months ended September 30, 2023, respectively. Depreciation expense, inclusive of landfill and finance lease amortization, was $75.3 million and $223.0 million for the three and nine months ended September 30, 2022, respectively. The Company recorded $1.7 million and $4.4 million of capitalized interest during the three and nine months ended September 30, 2023, respectively. The Company recorded $0.9 million and $2.0 million of capitalized interest during the three and nine months ended September 30, 2022, respectively. The capitalized interest in all periods is mainly due to the construction of a new incinerator in Kimball, Nebraska.

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(8) GOODWILL AND OTHER INTANGIBLE ASSETS
The changes in goodwill by segment for the nine months ended September 30, 2023 were as follows (in thousands):
Environmental ServicesSafety-Kleen Sustainability SolutionsTotals
Balance at January 1, 2023$1,071,846 $175,032 $1,246,878 
Increase from current period acquisition39,088  39,088 
Measurement period adjustments from prior period acquisitions 342 342 
Foreign currency translation118 47 165 
Balance at September 30, 2023$1,111,052 $175,421 $1,286,473 
The Company assesses goodwill on an annual basis as of December 31 or at an interim date when events or changes in the business environment (“triggering events”) would more likely than not reduce the fair value of a reporting unit below its carrying value. During the period ended September 30, 2023, no such triggering events were identified.
As of September 30, 2023 and December 31, 2022, the Company's intangible assets consisted of the following (in thousands):
September 30, 2023December 31, 2022
CostAccumulated
Amortization
NetCostAccumulated
Amortization
Net
Permits$189,982 $115,122 $74,860 $188,373 $109,036 $79,337 
Customer and supplier relationships
604,493 251,378 353,115 583,709 229,368 354,341 
Other intangible assets
100,012 34,547 65,465 89,388 24,818 64,570 
Total amortizable permits and other intangible assets
894,487 401,047 493,440 861,470 363,222 498,248 
Trademarks and trade names
120,100 — 120,100 122,534 — 122,534 
Total permits and other intangible assets
$1,014,587 $401,047 $613,540 $984,004 $363,222 $620,782 
Amortization expense of permits, customer and supplier relationships and other intangible assets was $12.5 million and $37.8 million in the three and nine months ended September 30, 2023, respectively. Amortization expense of permits, customer and supplier relationships and other intangible assets was $13.1 million and $37.6 million in the three and nine months ended September 30, 2022, respectively.
The expected amortization of the net carrying amount of finite-lived intangible assets at September 30, 2023 was as follows (in thousands):
Years Ending December 31,Expected Amortization
2023 (three months)$12,420 
202446,437 
202543,042 
202641,143 
202739,067 
Thereafter311,331 
$493,440 

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(9) ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES
Accrued expenses and other current liabilities consisted of the following (in thousands):
September 30, 2023December 31, 2022
Accrued insurance$98,803 $92,909 
Accrued interest14,791 20,033 
Accrued compensation and benefits98,108 123,226 
Accrued income, real estate, sales and other taxes59,035 61,442 
Accrued other98,360 99,106 
$369,097 $396,716 

(10) CLOSURE AND POST-CLOSURE LIABILITIES
The changes to closure and post-closure liabilities (also referred to as “asset retirement obligations”) from January 1, 2023 through September 30, 2023 were as follows (in thousands):
Landfill
Retirement
Liability
Non-Landfill
Retirement
Liability
Total
Balance at January 1, 2023$62,251 $56,550 $118,801 
Liabilities assumed in acquisitions 574 574 
Measurement period adjustments from prior period acquisitions 3,015 3,015 
New asset retirement obligations2,221  2,221 
Accretion3,765 3,351 7,116 
Changes in estimates recorded to consolidated statement of operations 47 47 
Changes in estimates recorded to consolidated balance sheet(327)1,461 1,134 
Expenditures(7,205)(5,852)(13,057)
Currency translation and other20 20 40 
Balance at September 30, 2023$60,725 $59,166 $119,891 
During the first quarter of 2023, the Company's non-commercial landfill at the Deer Park, Texas incineration facility reached its permitted capacity, as expected. The Company has commenced closure activities; however, there have been no changes to the liabilities related to this location. In the nine months ended September 30, 2023, there were no significant benefits or charges resulting from changes in estimates for closure and post-closure liabilities.

(11) REMEDIAL LIABILITIES 
The changes to remedial liabilities from January 1, 2023 through September 30, 2023 were as follows (in thousands):
Remedial
Liabilities for
Landfill Sites
Remedial
Liabilities for
Inactive Sites
Remedial
Liabilities
(Including
Superfund) for
Non-Landfill
Operations
Total
Balance at January 1, 2023$1,824 $59,749 $54,717 $116,290 
Accretion66 1,918 1,181 3,165 
Changes in estimates recorded to consolidated statement of operations13 1,318 1,880 3,211 
Expenditures(39)(2,896)(8,072)(11,007)
Currency translation and other 1 44 45 
Balance at September 30, 2023$1,864 $60,090 $49,750 $111,704 
In the nine months ended September 30, 2023, the Company increased its remedial liabilities for an inactive site and an active site by $1.1 million each due to changes in the estimates of the related liabilities to account for new information obtained regarding the ultimate remediation of these sites.
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(12) FINANCING ARRANGEMENTS
Long-term Debt
The following table is a summary of the Company’s long-term debt (in thousands):
Current Portion of Long-Term Debt:September 30, 2023December 31, 2022
Secured senior term loans$10,000 $10,000 
Long-Term Debt:
Secured senior term loans due June 30, 2024 ("2024 Term Loans")$ $