Clean Harbors (CLH) 10-Q 4 May 16 2016 Q1 Quarterly report Financial data

DOCUMENT AND ENTITY INFORMATION

DOCUMENT AND ENTITY INFORMATION - shares	3 Months Ended
	Mar. 31, 2016	Apr. 29, 2016
Document and Entity Information [Abstract]
Entity Registrant Name	CLEAN HARBORS INC
Entity Central Index Key	822,818
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Mar. 31, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Common Stock, Shares Outstanding		57,552,959

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 355,345	$ 184,708
Accounts receivable, net of allowances aggregating $28,628 and $31,426, respectively	458,301	496,004
Unbilled accounts receivable	31,805	25,940
Deferred costs	19,346	18,758
Inventories and supplies	154,768	149,521
Prepaid expenses and other current assets	44,056	46,265
Total current assets	1,063,621	921,196
Property, plant and equipment, net	1,596,872	1,532,467
Other assets:
Deferred financing costs	1,627	1,847
Goodwill	460,642	453,105
Permits and other intangibles, net	502,532	506,818
Other	16,381	15,995
Total other assets	981,182	977,765
Total assets	3,641,675	3,431,428
Current liabilities:
Accounts payable	188,834	241,183
Deferred revenue	63,587	61,882
Accrued expenses	191,592	193,660
Current portion of closure, post-closure and remedial liabilities	21,497	20,395
Total current liabilities	465,510	517,120
Other liabilities:
Closure and post-closure liabilities, less current portion of $7,194 and $7,229, respectively	50,896	49,020
Remedial liabilities, less current portion of $14,303 and $13,166, respectively	117,076	118,826
Long-term obligations	1,631,603	1,382,543
Deferred taxes, unrecognized tax benefits and other long-term liabilities	260,017	267,637
Total other liabilities	$ 2,059,592	$ 1,818,026
Commitments and contingent liabilities
Stockholders’ equity:
Common Stock, $.01 par value: Authorized 80,000,000; shares issued and outstanding 57,551,188 and 57,593,201 shares, respectively	$ 576	$ 576
Shares held under employee participation plan	(469)	(469)
Additional paid-in capital	733,726	738,401
Accumulated other comprehensive loss	(209,055)	(254,892)
Accumulated earnings	591,795	612,666
Total stockholders’ equity	1,116,573	1,096,282
Total liabilities and stockholders’ equity	$ 3,641,675	$ 3,431,428

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Account Receivable, allowances aggregating	$ 28,628	$ 31,426
Closure and post-closure liabilities, current portion	7,194	7,229
Remedial liabilities, current portion	$ 14,303	$ 13,166
Common stock, par value (in USD per share)	$ 0.01	$ 0.01
Common stock, authorized shares	80,000,000	80,000,000
Common stock, issued shares	57,551,188	57,593,201
Common stock, outstanding shares	57,551,188	57,593,201

UNAUDITED CONSOLIDATED STATEMEN

UNAUDITED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Revenues:
Service revenues	$ 530,231	$ 596,330
Product revenues	105,852	136,169
Total revenues	636,083	732,499
Cost of revenues (exclusive of items shown separately below)
Service revenues	373,986	416,390
Product revenues	90,293	130,117
Total cost of revenues	464,279	546,507
Selling, general and administrative expenses	104,484	107,715
Accretion of environmental liabilities	2,505	2,619
Depreciation and amortization	68,902	68,356
(Loss) income from operations	(4,087)	7,302
Other (expense) income	(350)	409
Interest expense, net of interest income of $150 and $151, respectively	(18,980)	(19,438)
(Loss) income before (benefit) provision for income taxes	(23,417)	(11,727)
Benefit for income taxes	(2,546)	(4,638)
Net (loss) income	$ (20,871)	$ (7,089)
Loss per share:
Basic (in USD per share)	$ (0.36)	$ (0.12)
Diluted (in USD per share)	$ (0.36)	$ (0.12)
Shares used to compute loss per share - Basic	57,617	58,875
Shares used to compute loss per share - Diluted	57,617	58,875

UNAUDITED CONSOLIDATED STATEME5

UNAUDITED CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income Statement [Abstract]
Interest income	$ 150	$ 151

UNAUDITED CONSOLIDATED STATEME6

UNAUDITED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Comprehensive Income [Abstract]
Net loss	$ (20,871)	$ (7,089)
Other comprehensive income (loss):
Foreign currency translation adjustments	45,837	(77,403)
Other comprehensive income (loss)	45,837	(77,403)
Comprehensive income (loss)	$ 24,966	$ (84,492)

UNAUDITED CONSOLIDATED STATEME7

UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash flows from operating activities:
Net loss	$ (20,871)	$ (7,089)
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	68,902	68,356
Allowance for doubtful accounts	1,072	2,204
Amortization of deferred financing costs and debt discount	872	819
Accretion of environmental liabilities	2,505	2,619
Changes in environmental liability estimates	(95)	385
Deferred income taxes	7	(903)
Stock-based compensation	2,093	1,850
Excess tax benefit of stock-based compensation	0	(5)
Net tax (deficiency) benefit on stock based awards	(345)	(111)
Other expense (income)	350	(409)
Environmental expenditures	(3,518)	(5,604)
Changes in assets and liabilities, net of acquisitions
Accounts receivable and unbilled accounts receivable	35,839	27,065
Inventories and supplies	(2,882)	22,131
Other current assets	1,838	374
Accounts payable	(36,195)	2,623
Other current and long-term liabilities	(10,283)	(29,528)
Net cash from operating activities	39,289	84,777
Cash flows from investing activities:
Additions to property, plant and equipment	(75,781)	(52,949)
Proceeds from sales of fixed assets	1,273	760
Acquisitions, net of cash acquired	(34,993)	0
Additions to intangible assets, including costs to obtain or renew permits	(512)	(1,171)
Net cash used in investing activities	(110,013)	(53,360)
Cash flows from financing activities:
Change in uncashed checks	(5,218)	(20,268)
Issuance of restricted shares, net of shares remitted	(1,425)	(1,154)
Repurchases of common stock	(4,998)	(15,379)
Deferred financing costs paid	(2,190)	0
Payments on capital leases	0	(398)
Excess tax benefit of stock-based compensation	0	5
Issuance of senior secured notes, including premium	250,625	0
Net cash from financing activities	236,794	(37,194)
Effect of exchange rate change on cash	4,567	(7,363)
Increase (decrease) in cash and cash equivalents	170,637	(13,140)
Cash and cash equivalents, beginning of period	184,708	246,879
Cash and cash equivalents, end of period	355,345	233,739
Cash payments for interest and income taxes:
Interest paid	21,808	21,667
Income taxes paid (received)	5,848	(3,790)
Non-cash investing and financing activities:
Accrual for repurchased shares	0	736
Property, plant and equipment accrued	14,947	22,832
Receivable for estimated purchase price adjustment	$ 250	$ 0

UNAUDITED CONSOLIDATED STATEME8

UNAUDITED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - 3 months ended Mar. 31, 2016 - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Shares Held Under Employee Participation Plan	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Accumulated Earnings
Balance at beginning of period at Dec. 31, 2015	$ 1,096,282	$ 576	$ (469)	$ 738,401	$ (254,892)	$ 612,666
Balance beginning of period (in shares) at Dec. 31, 2015		57,593
Increase (Decrease) in Stockholders' Equity
Net loss	(20,871)					(20,871)
Other comprehensive income	45,837				45,837
Stock-based compensation	2,093			2,093
Issuance of restricted shares, net of shares remitted	(1,425)	$ 1		(1,426)
Issuance of restricted shares, net of shares remitted (in shares)		62
Repurchases of common stock	(4,998)	$ (1)		(4,997)
Repurchases of common stock (in shares)		(104)
Net tax deficiency on stock based awards	(345)			(345)
Balance at end of period at Mar. 31, 2016	$ 1,116,573	$ 576	$ (469)	$ 733,726	$ (209,055)	$ 591,795
Balance ending of period (in shares) at Mar. 31, 2016		57,551

UNAUDITED CONSOLIDATED STATEME9

UNAUDITED CONSOLIDATED STATEMENTS OF STOCKHOLDERS'S EQUITY (PARENTHETICAL) - $ / shares	Mar. 31, 2016	Dec. 31, 2015
Statement of Stockholders' Equity [Abstract]
Common stock, par value (in USD per share)	$ 0.01	$ 0.01

BASIS OF PRESENTATION

BASIS OF PRESENTATION	3 Months Ended
	Mar. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
BASIS OF PRESENTATION	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,” the “Company” or "we") and have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”) and, in the opinion of management, include all adjustments which are of a normal recurring nature, 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 connection with the financial statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2015 , which includes the audited consolidated balance sheet as of December 31, 2015 from which the one presented herein was derived.

SIGNIFICANT ACCOUNTING POLICIES

SIGNIFICANT ACCOUNTING POLICIES	3 Months Ended
	Mar. 31, 2016
Accounting Policies [Abstract]
SIGNIFICANT ACCOUNTING POLICIES	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, 2015 . There have been no material changes in these policies or their application. Recent Accounting Pronouncements Standards implemented In February 2015, the Financial Accounting Standards Board ("FASB") issued Accounting Standard Update ("ASU") 2015-02, Consolidation (Topic 810) . The amendment provides guidance regarding amendments to the consolidation analysis. The adoption of ASU 2015-02 as of January 1, 2016 did not have an impact on the Company's consolidated financial statements. In September 2015, FASB issued ASU 2015-16, Business Combinations (Topic 805) . The amendment provides guidance to simplify the accounting for adjustments made to provisional amounts recognized in a business combination. This amendment eliminates the requirement to retrospectively account for those adjustments. The adoption of ASU 2015-16 as of January 1, 2016 did not have an impact on the Company's consolidated financial statements. Standards to be implemented The Company is currently evaluating the impact that the below standards to be implemented will have on the Company's consolidated financial statements. In February 2016, FASB issued ASU 2016-02, Leases (Topic 842) . The amendment increases transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. The amendments in this update are effective for annual reporting periods (including interim reporting periods within those periods) beginning after December 15, 2018. In March 2016, FASB issued ASU 2016-08, Revenue from Contracts with Customers (Topic 606) . ASU 2016-08 reduces the potential for diversity in practice arising from inconsistent application of the principal versus agent guidance, as well as the cost and complexity of applying Topic 606 both at transition and on an ongoing basis. The effective date and transition requirements for the amendments in this update are the same as the effective date and transition requirements of Update 2014-09, Revenue from Contracts with Customers (Topic 606) . In March 2016, FASB issued ASU 2016-09, Compensation - Stock Compensation (Topic 718) . The amendment simplifies several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities and classification on the statement of cash flows. The amendments in this update are effective for annual reporting periods (including interim reporting periods within those periods) beginning after December 15, 2016. In April 2016, FASB issued ASU 2016-10, Revenue from Contracts with Customers (Topic 606) . ASU 2016-10 reduces the potential for diversity in initial application, as well as the cost and complexity of applying Topic 606 both at transition and on an ongoing basis. The effective date and transition requirements for the amendments in this update are the same as the effective date and transition requirements of Update 2014-09, Revenue from Contracts with Customers (Topic 606) .

BUSINESS COMBINATIONS

BUSINESS COMBINATIONS	3 Months Ended
	Mar. 31, 2016
Business Combinations [Abstract]
BUSINESS COMBINATIONS	BUSINESS COMBINATIONS 2016 Acquisition On February 3, 2016 , the Company purchased an oil re-refinery facility located in Nevada from Vertex Energy, Inc. for a purchase price of $35.0 million in cash, subject to customary post-closing adjustments. The acquired facility further expands the Company's re-refinery network within its Kleen Performance Products segment. 2015 Acquisitions Thermo Fluids Inc. On April 11, 2015 , the Company completed the acquisition of Heckmann Environmental Services, Inc. (“HES”) and Thermo Fluids Inc. (“TFI”), a wholly-owned subsidiary of HES. The acquisition was accomplished through a purchase by Safety-Kleen, Inc., a wholly-owned subsidiary of the Company, of all of the issued and outstanding shares of HES from Nuverra Environmental Solutions, Inc. HES is a holding company that does not conduct any operations. TFI provides environmental services, including used oil recycling, used oil filter recycling, antifreeze products, parts washers and solvent recycling, and industrial waste management services, including vacuum services, remediation, lab pack and hazardous waste management. The Company acquired TFI for a purchase price of $79.3 million . The acquisition was financed with cash on hand and expands the Company’s environmental services customer base while also complimenting the SK Environmental Services network and presence in the western United States. The amount of revenue from TFI included in the Company's results of operations for the three months ended March 31, 2016 was $7.8 million . Results of TFI since acquisition have been included within the SK Environmental Services segment. The allocation of the purchase price was based on estimates of the fair value of assets acquired and liabilities assumed as of April 11, 2015 . The Company believes that such information provides a reasonable basis for estimating the fair values of assets acquired and liabilities assumed. The Company has finalized the purchase accounting for the acquisition of TFI. The impact of the purchase price measurement period adjustments and related tax impacts recorded in the current period was not material to the consolidated financial statements and accordingly the effects have not been retrospectively applied. The following table summarizes the recognized amounts of assets acquired and liabilities assumed at April 11, 2015 (in thousands): At acquisition date April 11, 2015 Measurement Period Adjustments At acquisition date as reported Accounts receivable $ 7,109 $ 192 $ 7,301 Inventories and supplies 1,791 — 1,791 Prepaid and other current assets 1,749 (1,084 ) 665 Property, plant and equipment 30,468 (2,827 ) 27,641 Permits and other intangibles 20,000 (1,900 ) 18,100 Current liabilities (5,859 ) (25 ) (5,884 ) Closure and post-closure liabilities (1,676 ) (657 ) (2,333 ) Deferred taxes, unrecognized tax benefits and other long-term liabilities (13,081 ) 3,907 (9,174 ) Total identifiable net assets 40,501 (2,394 ) 38,107 Goodwill 36,591 4,638 41,229 Total $ 77,092 $ 2,244 $ 79,336 Pro forma revenue and earnings amounts on a combined basis as if TFI had been acquired on January 1, 2015 are immaterial to the consolidated financial statements of the Company since that date. Other 2015 Acquisition In December 2015, the Company acquired certain assets and assumed certain defined liabilities of a privately owned company for approximately $14.7 million in cash. That company specializes in the collection and recycling of used oil filters and was a service provider to the SK Environmental Services segment prior to the acquisition. The acquired company has been integrated into the SK Environmental Services segment. In connection with this acquisition a preliminary goodwill amount of $ 7.4 million was recognized.

INVENTORIES AND SUPPLIES

INVENTORIES AND SUPPLIES	3 Months Ended
	Mar. 31, 2016
Inventory Disclosure [Abstract]
INVENTORIES AND SUPPLIES	INVENTORIES AND SUPPLIES Inventories and supplies consisted of the following (in thousands): March 31, 2016 December 31, 2015 Oil and oil products $ 36,196 $ 33,603 Supplies and drums 79,035 78,132 Solvent and solutions 9,026 8,868 Modular camp accommodations 15,438 15,126 Other 15,073 13,792 Total inventories and supplies $ 154,768 $ 149,521 As of March 31, 2016 and December 31, 2015 , other inventories consisted primarily of cleaning fluids, such as absorbents and wipers, and automotive fluids, such as windshield washer fluid and antifreeze.

PROPERTY, PLANT AND EQUIPMENT

PROPERTY, PLANT AND EQUIPMENT	3 Months Ended
	Mar. 31, 2016
Property, Plant and Equipment [Abstract]
PROPERTY, PLANT AND EQUIPMENT	PROPERTY, PLANT AND EQUIPMENT Property, plant and equipment consisted of the following (in thousands): March 31, 2016 December 31, 2015 Land $ 101,460 $ 100,582 Asset retirement costs (non-landfill) 12,188 12,434 Landfill assets 140,792 136,624 Buildings and improvements 353,869 344,209 Camp equipment 158,619 149,361 Vehicles 529,386 500,619 Equipment 1,400,407 1,328,915 Furniture and fixtures 5,477 5,337 Construction in progress 131,894 113,657 2,834,092 2,691,738 Less - accumulated depreciation and amortization 1,237,220 1,159,271 Total property, plant and equipment, net $ 1,596,872 $ 1,532,467 Interest in the amount of $1.2 million and $0.2 million was capitalized to fixed assets during the three months ended March 31, 2016 and March 31, 2015 , respectively. Depreciation expense, inclusive of landfill amortization was $59.3 million and $57.4 million for the three months ended March 31, 2016 and March 31, 2015 , respectively.

GOODWILL AND OTHER INTANGIBLE A

GOODWILL AND OTHER INTANGIBLE ASSETS	3 Months Ended
	Mar. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
GOODWILL AND OTHER INTANGIBLE ASSETS	GOODWILL AND OTHER INTANGIBLE ASSETS The changes in goodwill for the three months ended March 31, 2016 were as follows (in thousands): Technical Services Industrial & Field Services Kleen Performance Products SK Environmental Services Lodging Services Oil and Gas Field Services Totals Balance at January 1, 2016 $ 49,267 $ 105,286 $ 49,755 $ 216,589 $ 32,208 $ — $ 453,105 Measurement period adjustment from prior acquisitions — — — 2,095 — — 2,095 Foreign currency translation and other (573 ) 1,351 388 2,170 2,106 — 5,442 Balance at March 31, 2016 $ 48,694 $ 106,637 $ 50,143 $ 220,854 $ 34,314 $ — $ 460,642 The Company assesses goodwill for impairment on an annual basis as of December 31, or at an interim date when events or changes in the business environment would more likely than not reduce the fair value of a reporting unit below its carrying value. The Company conducted the annual impairment test of goodwill for all reporting units as of December 31, 2015 and determined that no adjustment to the carrying value of goodwill for any reporting units was necessary because the fair value of each of the reporting units exceeded that reporting unit's respective carrying value. The Company's next annual impairment assessment will be performed as of December 31, 2016 unless indicators arise that would require the Company to re-evaluate at an earlier date. As of March 31, 2016 and December 31, 2015, the Company's finite-lived and indefinite-lived intangible assets consisted of the following (in thousands): March 31, 2016 December 31, 2015 Cost Accumulated Net Weighted Cost Accumulated Net Weighted Permits $ 164,160 $ 63,179 $ 100,981 18.3 $ 161,396 $ 61,142 $ 100,254 19.0 Customer and supplier relationships 379,339 108,612 270,727 9.7 374,866 99,463 275,403 10.1 Other intangible assets 32,856 24,990 7,866 1.3 31,416 22,581 8,835 1.5 Total amortizable permits and other intangible assets 576,355 196,781 379,574 9.6 567,678 183,186 384,492 10.0 Trademarks and trade names 122,958 — 122,958 Indefinite 122,326 — 122,326 Indefinite Total permits and other intangible assets $ 699,313 $ 196,781 $ 502,532 $ 690,004 $ 183,186 $ 506,818 Amortization expense of permits and other intangible assets was $9.6 million and $11.0 million for the three months ended March 31, 2016 and March 31, 2015 , respectively. The expected amortization of the net carrying amount of finite-lived intangible assets at March 31, 2016 was as follows (in thousands): Years Ending December 31, Expected Amortization 2016 (nine months) $ 29,251 2017 33,936 2018 31,156 2019 28,438 2020 25,719 Thereafter 231,074 $ 379,574

ACCRUED EXPENSES

ACCRUED EXPENSES	3 Months Ended
	Mar. 31, 2016
Payables and Accruals [Abstract]
ACCRUED EXPENSES	ACCRUED EXPENSES Accrued expenses consisted of the following at March 31, 2016 and December 31, 2015 (in thousands): March 31, 2016 December 31, 2015 Insurance $ 54,999 $ 55,899 Interest 21,864 20,500 Accrued compensation and benefits 40,690 35,646 Income, real estate, sales and other taxes 36,103 37,095 Other 37,936 44,520 $ 191,592 $ 193,660

CLOSURE AND POST-CLOSURE LIABIL

CLOSURE AND POST-CLOSURE LIABILITIES	3 Months Ended
	Mar. 31, 2016
Asset Retirement Obligation Disclosure [Abstract]
CLOSURE AND POST-CLOSURE LIABILITIES	CLOSURE AND POST-CLOSURE LIABILITIES The changes to closure and post-closure liabilities (also referred to as “asset retirement obligations”) from January 1, 2016 through March 31, 2016 were as follows (in thousands): Landfill Non-Landfill Total Balance at January 1, 2016 $ 32,023 $ 24,226 $ 56,249 Adjustments during the measurement period related to acquisitions — 657 657 New asset retirement obligations 621 — 621 Accretion 691 567 1,258 Changes in estimates recorded to statement of operations (283 ) (132 ) (415 ) Expenditures (112 ) (391 ) (503 ) Currency translation and other 156 67 223 Balance at March 31, 2016 $ 33,096 $ 24,994 $ 58,090 All of the landfill facilities included in the above were active as of March 31, 2016 . There were no significant charges (benefits) in 2016 resulting from changes in estimates for closure and post-closure liabilities. New asset retirement obligations incurred during the first three months of 2016 were discounted at the credit-adjusted risk-free rate of 6.23% .

REMEDIAL LIABILITIES

REMEDIAL LIABILITIES	3 Months Ended
	Mar. 31, 2016
Environmental Remediation Obligations [Abstract]
REMEDIAL LIABILITIES	REMEDIAL LIABILITIES The changes to remedial liabilities for the three months ended March 31, 2016 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, 2016 $ 2,327 $ 63,613 $ 66,052 $ 131,992 Accretion 26 678 543 1,247 Changes in estimates recorded to statement of operations 71 (101 ) 350 320 Expenditures (26 ) (956 ) (2,033 ) (3,015 ) Currency translation and other — 51 784 835 Balance at March 31, 2016 $ 2,398 $ 63,285 $ 65,696 $ 131,379 In the three months ended March 31, 2016 there were no significant charges (benefits) resulting from changes in estimates for remedial liabilities.

FINANCING ARRANGEMENTS

FINANCING ARRANGEMENTS	3 Months Ended
	Mar. 31, 2016
Debt Disclosure [Abstract]
FINANCING ARRANGEMENTS	FINANCING ARRANGEMENTS The following table is a summary of the Company’s financing arrangements (in thousands): March 31, 2016 December 31, 2015 Senior unsecured notes, at 5.25%, due August 1, 2020 ("2020 Notes") $ 800,000 $ 800,000 Senior unsecured notes, at 5.125%, due June 1, 2021 ("2021 Notes") 845,000 595,000 Long-term obligations, at par $ 1,645,000 $ 1,395,000 Unamortized debt issuance costs and premium, net (13,397 ) (12,457 ) Long-term obligations, at carrying value $ 1,631,603 $ 1,382,543 At March 31, 2016 and December 31, 2015 , the fair value of the Company's 2020 Notes was $814.0 million and $812.0 million , respectively, based on quoted market prices for the instrument. The fair value of the 2020 Notes is considered a Level 2 measure according to the fair value hierarchy. On March 14, 2016, the Company issued through a private placement $ 250.0 million aggregate principal amount as additional notes under the indenture pursuant to which the Company previously issued on December 7, 2012, through a private placement $ 600.0 million aggregate principal amount of 5.125% senior unsecured notes due 2021 ("2021 Notes"). Interest payments are fixed semi-annually on June 1 and December 1 of each year. At March 31, 2016 and December 31, 2015 , the fair value of the Company's 2021 Notes was $853.5 million and $599.5 million , respectively, based on quoted market prices for the instrument. The fair value of the 2021 Notes is considered a Level 2 measure according to the fair value hierarchy. The Company also maintains a revolving credit facility which as of March 31, 2016 and December 31, 2015 had no outstanding loan balances. At March 31, 2016 , $156.4 million was available to borrow and outstanding letters of credit were $145.2 million . At December 31, 2015 , $178.5 million was available to borrow and outstanding letters of credit were $144.6 million . The revolving credit facility is guaranteed by all of Clean Harbors, Inc.'s (the "Parent's") domestic subsidiaries and secured by substantially all of the Parent’s and its domestic subsidiaries’ assets. Available credit for the Parent and its domestic subsidiaries is limited to 85% of their eligible accounts receivable and 100% of their cash deposited in a controlled account with the agent. Available credit for Parent’s Canadian subsidiaries is limited to 85% of their eligible accounts receivable and 100% of their cash deposited in a controlled account with the agent’s Canadian affiliate. The obligations of the Canadian subsidiaries under the revolving credit facility are guaranteed by all of Parent’s Canadian subsidiaries and secured by the accounts receivable of the Canadian subsidiaries, but the Canadian subsidiaries do not guarantee and are not otherwise responsible for the obligations of Parent or its domestic subsidiaries.

LOSS PER SHARE

LOSS PER SHARE	3 Months Ended
	Mar. 31, 2016
Earnings Per Share [Abstract]
LOSS PER SHARE	LOSS PER SHARE The following are computations of basic and diluted loss per share (in thousands except for per share amounts): Three Months Ended March 31, 2016 2015 Numerator for basic and diluted earnings per share: Net loss $ (20,871 ) $ (7,089 ) Denominator: Basic shares outstanding 57,617 58,875 Dilutive shares outstanding 57,617 58,875 Basic loss per share: $ (0.36 ) $ (0.12 ) Diluted loss per share: $ (0.36 ) $ (0.12 ) As a result of the net loss reported for the three months ended March 31, 2016 and 2015, all then outstanding stock options, restricted stock awards and performance awards totaling 474,318 and 539,983 , respectively, were excluded from the calculation of diluted loss per share as their inclusion would have an antidilutive effect.

ACCUMULATED OTHER COMPREHENSIVE

ACCUMULATED OTHER COMPREHENSIVE LOSS	3 Months Ended
	Mar. 31, 2016
Equity [Abstract]
ACCUMULATED OTHER COMPREHENSIVE LOSS	ACCUMULATED OTHER COMPREHENSIVE LOSS The changes in accumulated other comprehensive loss by component and related tax effects for the three months ended March 31, 2016 were as follows (in thousands): Foreign Currency Translation Unfunded Pension Liability Total Balance at January 1, 2016 $ (252,939 ) $ (1,953 ) $ (254,892 ) Other comprehensive income before reclassifications 45,837 — 45,837 Other comprehensive income $ 45,837 $ — $ 45,837 Balance at March 31, 2016 $ (207,102 ) $ (1,953 ) $ (209,055 ) There were no reclassifications out of accumulated other comprehensive loss during the three months ended March 31, 2016 and 2015 .

STOCK-BASED COMPENSATION

STOCK-BASED COMPENSATION	3 Months Ended
	Mar. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
STOCK-BASED COMPENSATION	STOCK-BASED COMPENSATION Total stock-based compensation cost charged to selling, general and administrative expenses for the three months ended March 31, 2016 and March 31, 2015 was $2.1 million and $1.8 million , respectively. The total income tax benefit recognized in the consolidated statements of operations from stock-based compensation was $0.5 million for each of the three months ended March 31, 2016 and March 31, 2015 . Restricted Stock Awards The following information relates to restricted stock awards that have been granted to employees and directors under the Company's equity incentive plans (the "Plans"). The restricted stock awards are not transferable until vested and the restrictions generally lapse upon the achievement of continued employment over a three -to- five -year period or service as a director until the following annual meeting of shareholders. The fair value of each restricted stock grant is based on the closing price of the Company's common stock on the date of grant and is amortized to expense over its vesting period. The following table summarizes information about restricted stock awards for the three months ended March 31, 2016 : Restricted Stock Number of Shares Weighted Average Grant-Date Fair Value Balance at January 1, 2016 362,618 $ 55.79 Granted 43,771 $ 43.87 Vested (85,388 ) $ 55.79 Forfeited (15,346 ) $ 57.20 Balance at March 31, 2016 305,655 $ 54.01 As of March 31, 2016 , there was $12.4 million of total unrecognized compensation cost arising from restricted stock awards under the Company's Plans. This cost is expected to be recognized over a weighted average period of 2.9 years. The total fair value of restricted stock vested during the three months ended March 31, 2016 and March 31, 2015 was $3.8 million and $3.2 million , respectively. Performance Stock Awards The following information relates to performance stock awards that have been granted to employees under the Company's Plans. Performance stock awards are subject to performance criteria established by the compensation committee of the Company's board of directors prior to or at the date of grant. The vesting of the performance stock awards is based on achieving such targets typically based on revenue, Adjusted EBITDA margin, return on invested capital percentage and Total Recordable Incident Rate. In addition, performance stock awards include continued service conditions. The fair value of each performance stock award is based on the closing price of the Company's common stock on the date of grant and is amortized to expense over the service period if achievement of performance measures is considered probable. The following table summarizes information about performance stock awards for the three months ended March 31, 2016 : Performance Stock Number of Shares Weighted Average Grant-Date Fair Value Balance at January 1, 2016 187,274 $ 57.13 Vested (8,420 ) $ 61.90 Forfeited (10,191 ) $ 57.65 Balance at March 31, 2016 168,663 $ 56.86 As of March 31, 2016 , there was $0.6 million of total unrecognized compensation cost arising from unvested performance stock awards deemed probable of vesting under the Company's Plans. The total fair value of performance awards vested during the three months ended March 31, 2016 and March 31, 2015 was $0.4 million and $0.3 million , respectively. Common Stock Repurchases On March 13, 2015, the Company's board of directors authorized the repurchase of up to $300 million of the Company's common stock. During the three months ended March 31, 2016 , the Company repurchased and retired a total of 0.1 million shares of the Company's common stock for a total cost of $5.0 million . Through March 31, 2016 , the Company has repurchased and retired a total of 3.5 million shares of the Company's common stock for a total cost of $182.7 million under this program. As of March 31, 2016 , an additional $117.3 million remains available for repurchase of shares under the current authorized program.

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	3 Months Ended
	Mar. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIES Legal and Administrative Proceedings The Company and its subsidiaries are subject to legal proceedings and claims arising in the ordinary course of business. Actions filed against the Company arise from commercial and employment-related claims including alleged class actions related to sales practices and wage and hour claims. The plaintiffs in these actions may be seeking damages or injunctive relief or both. These actions are in various jurisdictions and stages of proceedings, and some are covered in part by insurance. In addition, the Company’s waste management services operations are regulated by federal, state, provincial and local laws enacted to regulate discharge of materials into the environment, remediation of contaminated soil and groundwater or otherwise protect the environment. This ongoing regulation results in the Company frequently becoming a party to legal or administrative proceedings involving all levels of governmental authorities and other interested parties. The issues involved in such proceedings generally relate to alleged violations of existing permits and licenses or alleged responsibility under federal or state Superfund laws to remediate contamination at properties owned either by the Company or by other parties (“third party sites”) to which either the Company or the prior owners of certain of the Company’s facilities shipped wastes. At March 31, 2016 and December 31, 2015 , the Company had recorded reserves of $20.9 million and $21.9 million , respectively, in the Company's financial statements for actual or probable liabilities related to the legal and administrative proceedings in which the Company was then involved, the principal of which are described below. At March 31, 2016 and December 31, 2015 , the Company also believed that it was reasonably possible that the amount of these potential liabilities could be as much as $1.8 million and $1.9 million more, respectively. The Company periodically adjusts the aggregate amount of these reserves when actual or probable liabilities are paid or otherwise discharged, new claims arise, or additional relevant information about existing or probable claims becomes available. As of March 31, 2016 and December 31, 2015 , the $20.9 million and $21.9 million , respectively, of reserves consisted of (i) $18.7 million and $18.9 million , respectively, related to pending legal or administrative proceedings, including Superfund liabilities, which were included in remedial liabilities on the consolidated balance sheets, and (ii) $2.2 million and $3.0 million , respectively, primarily related to federal, state and provincial enforcement actions, which were included in accrued expenses on the consolidated balance sheets. As of March 31, 2016 , the principal legal and administrative proceedings in which the Company was involved, or which had been terminated during 2016 , were as follows: Ville Mercier. In September 2002, the Company acquired the stock of a subsidiary (the "Mercier Subsidiary") which owns a hazardous waste incinerator in Ville Mercier, Quebec (the "Mercier Facility"). The property adjacent to the Mercier Facility, which is also owned by the Mercier Subsidiary, is now contaminated as a result of actions dating back to 1968, when the Government of Quebec issued to a company unrelated to the Mercier Subsidiary two permits to dump organic liquids into lagoons on the property. In 1999, Ville Mercier and three neighboring municipalities filed separate legal proceedings against the Mercier Subsidiary and the Government of Quebec. In 2012, the municipalities amended their existing statement of claim to seek $2.9 million (Cdn) in general damages and $10.0 million (Cdn) in punitive damages, plus interest and costs, as well as injunctive relief. Both the Government of Quebec and the Company have filed summary judgment motions against the municipalities. The parties are currently attempting to negotiate a resolution and hearings on the motions have been delayed. In September 2007, the Quebec Minister of Sustainable Development, Environment and Parks issued a Notice pursuant to Section 115.1 of the Environment Quality Act, superseding Notices issued in 1992, which are the subject of the pending litigation. The more recent Notice notifies the Mercier Subsidiary that, if the Mercier Subsidiary does not take certain remedial measures at the site, the Minister intends to undertake those measures at the site and claim direct and indirect costs related to such measures. The Company has accrued for costs expected to be incurred relative to the resolution of this matter and believes this matter will not have a future material effect on its financial position or results of operations. Safety-Kleen Legal Proceedings. On December 28, 2012, the Company acquired Safety-Kleen, Inc. ("Safety-Kleen") and thereby became subject to the legal proceedings in which Safety-Kleen was a party on that date. In addition to certain Superfund proceedings in which Safety-Kleen has been named as a potentially responsible party as described below under “Superfund Proceedings,” the principal such legal proceedings involving Safety-Kleen which were outstanding as of March 31, 2016 were as follows: Product Liability Cases. Safety-Kleen is named as a defendant in various lawsuits that are currently pending in various courts and jurisdictions throughout the United States, including approximately 60 proceedings (excluding cases which have been settled but not formally dismissed) as of March 31, 2016 , wherein persons claim personal injury resulting from the use of Safety-Kleen's parts cleaning equipment or cleaning products. These proceedings typically involve allegations that the solvent used in Safety-Kleen's parts cleaning equipment contains contaminants and/or that Safety-Kleen's recycling process does not effectively remove the contaminants that become entrained in the solvent during their use. In addition, certain claimants assert that Safety-Kleen failed to warn adequately the product user of potential risks, including an historic failure to warn that solvent contains trace amounts of toxic or hazardous substances such as benzene. Safety-Kleen maintains insurance that it believes will provide coverage for these claims (over amounts accrued for self-insured retentions and deductibles in certain limited cases), except for punitive damages to the extent not insurable under state law or excluded from insurance coverage. Safety-Kleen believes that these claims lack merit and has historically vigorously defended, and intends to continue to vigorously defend, itself and the safety of its products against all of these claims. Such matters are subject to many uncertainties and outcomes are not predictable with assurance. Consequently, Safety-Kleen is unable to ascertain the ultimate aggregate amount of monetary liability or financial impact with respect to these matters as of March 31, 2016 . From January 1, 2016 to March 31, 2016 , nine product liability claims were settled or dismissed. Due to the nature of these claims and the related insurance, the Company did not incur any expense as Safety-Kleen's insurance provided coverage in full for all such claims. Safety-Kleen may be named in similar, additional lawsuits in the future, including claims for which insurance coverage may not be available. Superfund Proceedings The Company has been notified that either the Company (which, since December 28, 2012, includes Safety-Kleen) or the prior owners of certain of the Company's facilities for which the Company may have certain indemnification obligations have been identified as potentially responsible parties ("PRPs") or potential PRPs in connection with 129 sites which are subject to or are proposed to become subject to proceedings under federal or state Superfund laws. Of the 129 sites, two (the Wichita Facility and the BR Facility described below) involve facilities that are now owned by the Company and 127 involve third party sites to which either the Company or the prior owners of certain of the Company’s facilities shipped wastes. Of the 127 third party sites, 32 are now settled, 17 are currently requiring expenditures on remediation and 78 are not currently requiring expenditures on remediation. In connection with each site, the Company has estimated the extent, if any, to which it may be subject, either directly or as a result of any indemnification obligations, for cleanup and remediation costs, related legal and consulting costs associated with PRP investigations, settlements, and related legal and administrative proceedings. The amount of such actual and potential liability is inherently difficult to estimate because of, among other relevant factors, uncertainties as to the legal liability (if any) of the Company or the prior owners of certain of the Company's facilities to contribute a portion of the cleanup costs, the assumptions that must be made in calculating the estimated cost and timing of remediation, the identification of other PRPs and their respective capability and obligation to contribute to remediation efforts, and the existence and legal standing of indemnification agreements (if any) with prior owners, which may either benefit the Company or subject the Company to potential indemnification obligations. In addition to the Wichita Property and the BR Facility, Clean Harbors believes its potential liability could exceed $100,000 at 13 of the 127 third party sites. Wichita Property. The Company acquired in 2002 as part of the CSD assets a service center located in Wichita, Kansas (the "Wichita Property"). The Wichita Property is one of several properties located within the boundaries of a 1,400 acre state-designated Superfund site in an old industrial section of Wichita known as the North Industrial Corridor Site. Along with numerous other PRPs, the former owner executed a consent decree relating to such site with the U.S. Environmental Protection Agency (the "EPA"), and the Company is continuing an ongoing remediation program for the Wichita Property in accordance with that consent decree. The Company also acquired rights under an indemnification agreement between the former owner and an earlier owner of the Wichita Property. The Company filed suit against the earlier owner in July of 2015 to recover costs incurred during the cleanup of the property. BR Facility. The Company acquired in 2002 a former hazardous waste incinerator and landfill in Baton Rouge (the "BR Facility"), for which operations had been previously discontinued by the prior owner. In September 2007, the EPA issued a special notice letter to the Company related to the Devil's Swamp Lake Site ("Devil's Swamp") in East Baton Rouge Parish, Louisiana. Devil's Swamp includes a lake located downstream of an outfall ditch where wastewater and stormwater have been discharged, and Devil's Swamp is proposed to be included on the National Priorities List due to the presence of Contaminants of Concern ("COC") cited by the EPA. These COCs include substances of the kind found in wastewater and storm water discharged from the BR Facility in past operations. The EPA originally requested COC generators to submit a good faith offer to conduct a remedial investigation feasibility study directed towards the eventual remediation of the site. The Company is currently performing corrective actions at the BR Facility under an order issued by the Louisiana Department of Environmental Quality, and has begun conducting the remedial investigation and feasibility study under an order issued by the EPA. The Company cannot presently estimate the potential additional liability for the Devil's Swamp cleanup until a final remedy is selected by the EPA. Third Party Sites. Of the 127 third party sites at which the Company has been notified it is a PRP or potential PRP or may have indemnification obligations, Clean Harbors has an indemnification agreement at 11 of these sites with ChemWaste, a former subsidiary of Waste Management, Inc., and at six additional of these third party sites, Safety-Kleen has a similar indemnification agreement with McKesson Corporation. These agreements indemnify the Company (which now includes Safety-Kleen) with respect to any liability at the 17 sites for waste disposed prior to the Company's (or Safety-Kleen's) acquisition of the former subsidiaries of Waste Management or McKesson which had shipped wastes to those sites. Accordingly, Waste Management or McKesson are paying all costs of defending those subsidiaries in those 17 cases, including legal fees and settlement costs. However, there can be no guarantee that the Company's ultimate liabilities for those sites will not exceed the amount recorded or that indemnities applicable to any of these sites will be available to pay all or a portion of related costs. Except for the indemnification agreements which the Company holds from ChemWaste and McKesson, the Company does not have an indemnity agreement with respect to any of the 127 third party sites discussed above. Federal, State and Provincial Enforcement Actions From time to time, the Company pays fines or penalties in regulatory proceedings relating primarily to waste treatment, storage or disposal facilities. As of March 31, 2016 and December 31, 2015 , there were five and six proceedings, respectively, for which the Company reasonably believed that the sanctions could equal or exceed $100,000 . The Company believes that the fines or other penalties in these or any of the other regulatory proceedings will, individually or in the aggregate, not have a material effect on its financial condition, results of operations or cash flows.

INCOME TAXES

INCOME TAXES	3 Months Ended
	Mar. 31, 2016
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES The Company records a tax provision or benefit on an interim basis using an estimated annual effective tax rate. This rate is applied to the current period ordinary income or loss to determine the income tax provision or benefit allocated to the interim period. Losses from jurisdictions for which no benefit can be recognized and the income tax effects of unusual or infrequent items are excluded from the estimated annual effective tax rate and are recognized in the impacted interim period. The estimated annual effective tax rate may be significantly impacted by projected earnings mix by tax jurisdiction. Adjustments to the estimated annual effective income tax rate are recognized in the period when such estimates are revised. The Company's effective tax rate for the three months ended March 31, 2016 was 10.9% compared to 39.5% for the same period in 2015. The decrease in the effective rates for the three months ended March 31, 2016 is primarily due to not recognizing income tax benefits from current operating losses related to certain Canadian entities. As of March 31, 2016 and December 31, 2015 , the Company had recorded $2.1 million of liabilities for unrecognized tax benefits and $0.4 million of interest, respectively. Due to expiring statute of limitation periods, the Company believes that total unrecognized tax benefits will decrease by approximately $0.5 million within the next 12 months. This is the result of a pre-acquisition audit settlement for one of our foreign entities.

SEGMENT REPORTING

SEGMENT REPORTING	3 Months Ended
	Mar. 31, 2016
Segment Reporting [Abstract]
SEGMENT REPORTING	SEGMENT REPORTING Segment reporting is prepared on the same basis that the Company's chief executive officer, who is the Company's chief operating decision maker, manages the business, makes operating decisions and assesses performance. As of March 31, 2016 , the Company's operations were managed in six reportable segments based primarily upon the nature of the various operations and services provided: Technical Services, Industrial and Field Services which consists of the Industrial Services and Field Services operating segments, Kleen Performance Products, SK Environmental Services, Lodging Services and Oil and Gas Field Services. Third party revenue is revenue billed to outside customers by a particular segment. Direct revenue is revenue allocated to the segment providing the product or service. Intersegment revenues represent the sharing of third party revenues among the segments based on products and services provided by each segment as if the products and services were sold directly to the third party. The intersegment revenues are shown net. The negative intersegment revenues are due to more transfers out of customer revenues to other segments than transfers in of customer revenues from other segments. The operations not managed through the Company’s six reportable segments are recorded as “Corporate Items.” Corporate Items revenues consist of two different operations for which the revenues are insignificant. Corporate Items cost of revenues represents certain central services that are not allocated to the six segments for internal reporting purposes. Corporate Items selling, general and administrative expenses include typical corporate items such as legal, accounting and other items of a general corporate nature that are not allocated to the Company’s six reportable segments. Performance of the segments is evaluated on several factors, of which the primary financial measure is “Adjusted EBITDA,” which consists of net loss plus accretion of environmental liabilities, depreciation and amortization, net interest expense, benefit for income taxes, other non-cash charges not deemed representative of fundamental segment results and excludes other expense (income). Transactions between the segments are accounted for at the Company’s best estimate based on similar transactions with outside customers. The following table reconciles third party revenues to direct revenues for the three months ended March 31, 2016 and 2015 (in thousands): For the Three Months Ended March 31, 2016 For the Three Months Ended March 31, 2015 Third party revenues Intersegment revenues, net Corporate Items, net Direct revenues Third party revenues Intersegment revenues, net Corporate Items, net Direct revenues Technical Services $ 219,105 $ 34,844 $ 388 $ 254,337 $ 240,325 $ 34,904 $ 1,297 $ 276,526 Industrial and Field Services 121,577 (7,466 ) (17 ) 114,094 146,868 (6,561 ) 78 140,385 Kleen Performance Products 67,543 (9,407 ) (1 ) 58,135 96,807 (18,257 ) (1 ) 78,549 SK Environmental Services 179,418 (19,114 ) 367 160,671 160,684 (11,582 ) — 149,102 Lodging Services 15,645 264 21 15,930 34,104 164 17 34,285 Oil and Gas Field Services 32,016 879 87 32,982 53,587 1,332 9 54,928 Corporate Items 779 — (845 ) (66 ) 124 — (1,400 ) (1,276 ) Total $ 636,083 $ — $ — $ 636,083 $ 732,499 $ — $ — $ 732,499 The following table presents Adjusted EBITDA information used by management by reported segment (in thousands). The Company does not allocate interest expense, income taxes, depreciation, amortization, accretion of environmental liabilities, other non-cash charges not deemed representative of fundamental segment results, and other expense (income) to its segments. For the Three Months Ended March 31, 2016 2015 Adjusted EBITDA: Technical Services $ 60,398 $ 63,401 Industrial and Field Services 2,118 10,309 Kleen Performance Products 4,560 (4,476 ) SK Environmental Services 35,495 27,249 Lodging Services 1,019 6,910 Oil and Gas Field Services (1,394 ) 1,403 Corporate Items (34,876 ) (26,519 ) Total $ 67,320 $ 78,277 Reconciliation to Consolidated Statements of Operations: Accretion of environmental liabilities 2,505 2,619 Depreciation and amortization 68,902 68,356 (Loss) income from operations (4,087 ) 7,302 Other expense (income) 350 (409 ) Interest expense, net of interest income 18,980 19,438 Loss before benefit for income taxes $ (23,417 ) $ (11,727 ) The following table presents certain assets by reportable segment and in the aggregate (in thousands): March 31, 2016 Technical Industrial and Field Kleen Performance Products SK Environmental Services Lodging Services Oil and Gas Field Corporate Totals Property, plant and equipment, net $ 499,464 $ 234,088 $ 202,445 $ 306,462 $ 108,489 $ 153,869 $ 92,055 $ 1,596,872 Goodwill 48,694 106,637 50,143 220,854 34,314 — — 460,642 Permits and other intangible, net 73,632 14,215 139,725 254,230 7,004 13,726 — 502,532 Total assets $ 818,098 $ 378,639 $ 501,019 $ 858,544 $ 188,547 $ 243,543 $ 653,285 $ 3,641,675 December 31, 2015 Technical Industrial and Field Kleen Performance Products SK Environmental Services Lodging Services Oil and Gas Field Corporate Totals Property, plant and equipment, net $ 483,425 $ 237,660 $ 193,855 $ 264,539 $ 105,208 $ 156,286 $ 91,494 $ 1,532,467 Goodwill 49,267 105,286 49,755 216,589 32,208 — — 453,105 Permits and other intangible, net 73,601 14,649 140,410 256,251 7,045 14,862 — 506,818 Total assets $ 800,060 $ 368,858 $ 492,483 $ 805,488 $ 181,357 $ 244,210 $ 538,972 $ 3,431,428 The following table presents total assets by geographical area (in thousands): March 31, 2016 December 31, 2015 United States $ 2,783,892 $ 2,575,746 Canada 853,112 851,949 Other foreign 4,671 3,733 Total $ 3,641,675 $ 3,431,428

GUARANTOR AND NON-GUARANTOR SUB

GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION	3 Months Ended
	Mar. 31, 2016
Guarantor and Non-Guarantor Subsidiaries Financial Information [Abstract]
GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION	GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION The 2020 Notes and the 2021 Notes are guaranteed by substantially all of the Company's subsidiaries organized in the United States. Each guarantor for the 2020 Notes and the 2021 Notes is a 100% owned subsidiary of Clean Harbors, Inc. and its guarantee is both full and unconditional and joint and several. The guarantees, are however, subject to customary release provisions under which, in particular, the guarantee of any of our domestic restricted subsidiaries will be released if we sell such subsidiary to an unrelated third party in accordance with the terms of the indenture which governs the notes. The 2020 Notes and the 2021 Notes are not guaranteed by the Company’s Canadian or other foreign subsidiaries. The following presents supplemental condensed consolidating financial information for the parent company, the guarantor subsidiaries and the non-guarantor subsidiaries, respectively. As discussed further in Note 10, “Financing Arrangements,” to our consolidated financial statements included herein, during the three months ended March 31, 2016, the Parent Company issued through a private placement $ 250.0 million aggregate principal amount as additional notes under the 2021 Notes. In connection with this offering the proceeds were then transferred to the US Guarantor Subsidiaries and are reflected as an investment to the Parent Company in the US Guarantor subsidiaries for the period ending March 31, 2016. Following is the condensed consolidating balance sheet at March 31, 2016 (in thousands): Clean Harbors, Inc. U.S. Guarantor Subsidiaries Foreign Non-Guarantor Subsidiaries Consolidating Adjustments Total Assets: Cash and cash equivalents $ 56,028 $ 219,856 $ 79,461 $ — $ 355,345 Intercompany receivables 172,776 283,034 38,065 (493,875 ) — Accounts receivable, net — 380,873 77,428 — 458,301 Other current assets — 185,171 64,804 — 249,975 Property, plant and equipment, net — 1,129,262 467,610 — 1,596,872 Investments in subsidiaries 2,832,086 524,500 — (3,356,586 ) — Intercompany debt receivable — 278,018 3,701 (281,719 ) — Goodwill — 369,400 91,242 — 460,642 Permits and other intangibles, net — 429,388 73,144 — 502,532 Other long-term assets 1,626 9,457 6,925 — 18,008 Total assets $ 3,062,516 $ 3,808,959 $ 902,380 $ (4,132,180 ) $ 3,641,675 Liabilities and Stockholders’ Equity: Current liabilities $ 22,124 $ 382,100 $ 61,286 $ — $ 465,510 Intercompany payables 288,515 203,542 1,818 (493,875 ) — Closure, post-closure and remedial liabilities, net — 152,767 15,205 — 167,972 Long-term obligations 1,631,603 — — — 1,631,603 Intercompany debt payable 3,701 — 278,018 (281,719 ) — Other long-term liabilities — 238,464 21,553 — 260,017 Total liabilities 1,945,943 976,873 377,880 (775,594 ) 2,525,102 Stockholders’ equity 1,116,573 2,832,086 524,500 (3,356,586 ) 1,116,573 Total liabilities and stockholders’ equity $ 3,062,516 $ 3,808,959 $ 902,380 $ (4,132,180 ) $ 3,641,675 Following is the condensed consolidating balance sheet at December 31, 2015 (in thousands): Clean Harbors, Inc. U.S. Guarantor Subsidiaries Foreign Non-Guarantor Subsidiaries Consolidating Adjustments Total Assets: Cash and cash equivalents $ 11,017 $ 83,479 $ 90,212 $ — $ 184,708 Intercompany receivables 164,709 213,243 39,804 (417,756 ) — Accounts receivables — 404,580 91,424 — 496,004 Other current assets — 179,969 60,515 — 240,484 Property, plant and equipment, net — 1,082,466 450,001 — 1,532,467 Investments in subsidiaries 2,547,307 522,067 — (3,069,374 ) — Intercompany debt receivable — 260,957 3,701 (264,658 ) — Goodwill — 367,306 85,799 — 453,105 Permits and other intangibles, net — 435,080 71,738 — 506,818 Other long-term assets 1,068 10,274 6,500 — 17,842 Total assets $ 2,724,101 $ 3,559,421 $ 899,694 $ (3,751,788 ) $ 3,431,428 Liabilities and Stockholders’ Equity: Current liabilities $ 20,813 $ 424,588 $ 71,719 $ — $ 517,120 Intercompany payables 220,762 195,287 1,707 (417,756 ) — Closure, post-closure and remedial liabilities, net — 153,190 14,656 — 167,846 Long-term obligations 1,382,543 — — — 1,382,543 Intercompany debt payable 3,701 — 260,957 (264,658 ) — Other long-term liabilities — 239,049 28,588 — 267,637 Total liabilities 1,627,819 1,012,114 377,627 (682,414 ) 2,335,146 Stockholders’ equity 1,096,282 2,547,307 522,067 (3,069,374 ) 1,096,282 Total liabilities and stockholders’ equity $ 2,724,101 $ 3,559,421 $ 899,694 $ (3,751,788 ) $ 3,431,428 Following is the consolidating statement of operations for the three months ended March 31, 2016 (in thousands): Clean Harbors, Inc. U.S. Guarantor Subsidiaries Foreign Non-Guarantor Subsidiaries Consolidating Adjustments Total Revenues Service revenues $ — $ 428,477 $ 114,023 $ (12,269 ) $ 530,231 Product revenues — 89,588 18,713 (2,449 ) 105,852 Total revenues — 518,065 132,736 (14,718 ) 636,083 Cost of revenues (exclusive of items shown separately below) Service cost of revenues — 282,964 103,291 (12,269 ) 373,986 Product cost of revenues — 79,354 13,388 (2,449 ) 90,293 Total cost of revenues — 362,318 116,679 (14,718 ) 464,279 Selling, general and administrative expenses 24 80,655 23,805 — 104,484 Accretion of environmental liabilities — 2,290 215 — 2,505 Depreciation and amortization — 48,695 20,207 — 68,902 (Loss) income from operations (24 ) 24,107 (28,170 ) — (4,087 ) Other expense — (88 ) (262 ) — (350 ) Interest (expense) income (20,143 ) 1,111 52 — (18,980 ) Equity in earnings of subsidiaries, net of taxes (8,771 ) (26,495 ) — 35,266 — Intercompany interest income (expense) — 5,159 (5,159 ) — — (Loss) income before (benefit) provision for income taxes (28,938 ) 3,794 (33,539 ) 35,266 (23,417 ) (Benefit) provision for income taxes (8,067 ) 12,565 (7,044 ) — (2,546 ) Net loss (20,871 ) (8,771 ) (26,495 ) 35,266 (20,871 ) Other comprehensive income 45,837 45,837 28,927 (74,764 ) 45,837 Comprehensive income $ 24,966 $ 37,066 $ 2,432 $ (39,498 ) $ 24,966 Following is the consolidating statement of operations for the three months ended March 31, 2015 (in thousands): Clean Harbors, Inc. U.S. Guarantor Subsidiaries Foreign Non-Guarantor Subsidiaries Consolidating Adjustments Total Revenues Service revenues $ — $ 418,517 $ 193,453 $ (15,640 ) $ 596,330 Product revenues — 116,536 23,204 (3,571 ) 136,169 Total revenues — 535,053 216,657 (19,211 ) 732,499 Cost of revenues (exclusive of items shown separately below) Service cost of revenues — 277,602 154,428 (15,640 ) 416,390 Product cost of revenues — 115,286 18,402 (3,571 ) 130,117 Total cost of revenues — 392,888 172,830 (19,211 ) 546,507 Selling, general and administrative expenses 25 80,984 26,706 — 107,715 Accretion of environmental liabilities — 2,306 313 — 2,619 Depreciation and amortization — 45,801 22,555 — 68,356 (Loss) income from operations (25 ) 13,074 (5,747 ) — 7,302 Other income (expense) — 111 298 — 409 Interest (expense) income (19,639 ) 178 23 — (19,438 ) Equity in earnings of subsidiaries, net of taxes 4,709 (7,029 ) — 2,320 — Intercompany interest income (expense) — 5,977 (5,977 ) — — (Loss) income before (benefit) provision for income taxes (14,955 ) 12,311 (11,403 ) 2,320 (11,727 ) (Benefit) provision for income taxes (7,866 ) 7,602 (4,374 ) — (4,638 ) Net (loss) income (7,089 ) 4,709 (7,029 ) 2,320 (7,089 ) Other comprehensive loss (77,403 ) (77,403 ) (50,635 ) 128,038 (77,403 ) Comprehensive loss $ (84,492 ) $ (72,694 ) $ (57,664 ) $ 130,358 $ (84,492 ) Following is the condensed consolidating statement of cash flows for the three months ended March 31, 2016 (in thousands): Clean Harbors, Inc. U.S. Guarantor Subsidiaries Foreign Non-Guarantor Subsidiaries Consolidating Adjustments Total Net cash from (used in) operating activities $ 47,201 $ (3,361 ) $ (4,551 ) $ — $ 39,289 Cash flows used in investing activities: Additions to property, plant and equipment — (64,754 ) (11,027 ) — (75,781 ) Proceeds from sales of fixed assets — 277 996 — 1,273 Acquisitions, net of cash acquired — (34,993 ) — — (34,993 ) Costs to obtain or renew permits — (465 ) (47 ) — (512 ) Investment in subsidiaries (250,625 ) — — 250,625 — Intercompany — (6,423 ) — 6,423 — Net cash used in investing activities (250,625 ) (106,358 ) (10,078 ) 257,048 (110,013 ) Cash flows from (used in) financing activities: Change in uncashed checks — (4,529 ) (689 ) — (5,218 ) Issuance of restricted shares, net of shares remitted (1,425 ) — — — (1,425 ) Repurchases of common stock (4,998 ) — — — (4,998 ) Deferred financing costs paid (2,190 ) — — — (2,190 ) Issuance of senior secured notes, including premium 250,625 250,625 — (250,625 ) 250,625 Intercompany 6,423 — — (6,423 ) — Net cash from (used in) financing activities 248,435 246,096 (689 ) (257,048 ) 236,794 Effect of exchange rate change on cash — — 4,567 — 4,567 Increase (decrease) in cash and cash equivalents 45,011 136,377 (10,751 ) — 170,637 Cash and cash equivalents, beginning of period 11,017 83,479 90,212 — 184,708 Cash and cash equivalents, end of period $ 56,028 $ 219,856 $ 79,461 $ — $ 355,345 Following is the condensed consolidating statement of cash flows for the three months ended March 31, 2015 (in thousands): Clean Harbors, Inc. U.S. Guarantor Subsidiaries Foreign Non-Guarantor Subsidiaries Consolidating Adjustments Total Net cash (used in) from operating activities $ (8,032 ) $ 85,311 $ 7,498 $ — $ 84,777 Cash flows used in investing activities: Additions to property, plant and equipment — (37,670 ) (15,279 ) — (52,949 ) Proceeds from sale of fixed assets — 113 647 — 760 Costs to obtain or renew permits — — (1,171 ) — (1,171 ) Intercompany — (108,435 ) — 108,435 — Net cash used in investing activities — (145,992 ) (15,803 ) 108,435 (53,360 ) Cash flows from (used in) financing activities: Change in uncashed checks — (14,694 ) (5,574 ) — (20,268 ) Issuance of restricted shares, net of shares remitted (1,154 ) — — — (1,154 ) Repurchases of common stock (15,379 ) — — — (15,379 ) Excess tax benefit of stock-based compensation 5 — — — 5 Payments of capital leases — (164 ) (234 ) — (398 ) Intercompany 108,435 — — (108,435 ) — Net cash from (used in) financing activities 91,907 (14,858 ) (5,808 ) (108,435 ) (37,194 ) Effect of exchange rate change on cash — — (7,363 ) — (7,363 ) Decrease in cash and cash equivalents 83,875 (75,539 ) (21,476 ) — (13,140 ) Cash and cash equivalents, beginning of period 1,006 154,147 91,726 — 246,879 Cash and cash equivalents, end of period $ 84,881 $ 78,608 $ 70,250 $ — $ 233,739

SUBSEQUENT EVENTS

SUBSEQUENT EVENTS	3 Months Ended
	Mar. 31, 2016
Subsequent Events [Abstract]
SUBSEQUENT EVENTS	SUBSEQUENT EVENTS On April 30, 2016, the Company purchased two blending and packaging plants and related assets in New Orleans, Louisiana and Brampton, Ontario. The results of the acquired company will be included in the Kleen Performance Products Segment.

SIGNIFICANT ACCOUNTING POLICI28

SIGNIFICANT ACCOUNTING POLICIES (Policies)	3 Months Ended
	Mar. 31, 2016
Accounting Policies [Abstract]
Recent Accounting Pronouncements	Recent Accounting Pronouncements Standards implemented In February 2015, the Financial Accounting Standards Board ("FASB") issued Accounting Standard Update ("ASU") 2015-02, Consolidation (Topic 810) . The amendment provides guidance regarding amendments to the consolidation analysis. The adoption of ASU 2015-02 as of January 1, 2016 did not have an impact on the Company's consolidated financial statements. In September 2015, FASB issued ASU 2015-16, Business Combinations (Topic 805) . The amendment provides guidance to simplify the accounting for adjustments made to provisional amounts recognized in a business combination. This amendment eliminates the requirement to retrospectively account for those adjustments. The adoption of ASU 2015-16 as of January 1, 2016 did not have an impact on the Company's consolidated financial statements. Standards to be implemented The Company is currently evaluating the impact that the below standards to be implemented will have on the Company's consolidated financial statements. In February 2016, FASB issued ASU 2016-02, Leases (Topic 842) . The amendment increases transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. The amendments in this update are effective for annual reporting periods (including interim reporting periods within those periods) beginning after December 15, 2018. In March 2016, FASB issued ASU 2016-08, Revenue from Contracts with Customers (Topic 606) . ASU 2016-08 reduces the potential for diversity in practice arising from inconsistent application of the principal versus agent guidance, as well as the cost and complexity of applying Topic 606 both at transition and on an ongoing basis. The effective date and transition requirements for the amendments in this update are the same as the effective date and transition requirements of Update 2014-09, Revenue from Contracts with Customers (Topic 606) . In March 2016, FASB issued ASU 2016-09, Compensation - Stock Compensation (Topic 718) . The amendment simplifies several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities and classification on the statement of cash flows. The amendments in this update are effective for annual reporting periods (including interim reporting periods within those periods) beginning after December 15, 2016. In April 2016, FASB issued ASU 2016-10, Revenue from Contracts with Customers (Topic 606) . ASU 2016-10 reduces the potential for diversity in initial application, as well as the cost and complexity of applying Topic 606 both at transition and on an ongoing basis. The effective date and transition requirements for the amendments in this update are the same as the effective date and transition requirements of Update 2014-09, Revenue from Contracts with Customers (Topic 606) .

BUSINESS COMBINATIONS (Tables)

BUSINESS COMBINATIONS (Tables)	3 Months Ended
	Mar. 31, 2016
Business Combinations [Abstract]
Schedule of Business Acquisitions, by Acquisition	The following table summarizes the recognized amounts of assets acquired and liabilities assumed at April 11, 2015 (in thousands): At acquisition date April 11, 2015 Measurement Period Adjustments At acquisition date as reported Accounts receivable $ 7,109 $ 192 $ 7,301 Inventories and supplies 1,791 — 1,791 Prepaid and other current assets 1,749 (1,084 ) 665 Property, plant and equipment 30,468 (2,827 ) 27,641 Permits and other intangibles 20,000 (1,900 ) 18,100 Current liabilities (5,859 ) (25 ) (5,884 ) Closure and post-closure liabilities (1,676 ) (657 ) (2,333 ) Deferred taxes, unrecognized tax benefits and other long-term liabilities (13,081 ) 3,907 (9,174 ) Total identifiable net assets 40,501 (2,394 ) 38,107 Goodwill 36,591 4,638 41,229 Total $ 77,092 $ 2,244 $ 79,336

INVENTORIES AND SUPPLIES (Table

INVENTORIES AND SUPPLIES (Tables)	3 Months Ended
	Mar. 31, 2016
Inventory Disclosure [Abstract]
Schedule of Inventory	Inventories and supplies consisted of the following (in thousands): March 31, 2016 December 31, 2015 Oil and oil products $ 36,196 $ 33,603 Supplies and drums 79,035 78,132 Solvent and solutions 9,026 8,868 Modular camp accommodations 15,438 15,126 Other 15,073 13,792 Total inventories and supplies $ 154,768 $ 149,521

PROPERTY, PLANT AND EQUIPMENT (

PROPERTY, PLANT AND EQUIPMENT (Tables)	3 Months Ended
	Mar. 31, 2016
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	Property, plant and equipment consisted of the following (in thousands): March 31, 2016 December 31, 2015 Land $ 101,460 $ 100,582 Asset retirement costs (non-landfill) 12,188 12,434 Landfill assets 140,792 136,624 Buildings and improvements 353,869 344,209 Camp equipment 158,619 149,361 Vehicles 529,386 500,619 Equipment 1,400,407 1,328,915 Furniture and fixtures 5,477 5,337 Construction in progress 131,894 113,657 2,834,092 2,691,738 Less - accumulated depreciation and amortization 1,237,220 1,159,271 Total property, plant and equipment, net $ 1,596,872 $ 1,532,467

GOODWILL AND OTHER INTANGIBLE32

GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)	3 Months Ended
	Mar. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of changes to goodwill	The changes in goodwill for the three months ended March 31, 2016 were as follows (in thousands): Technical Services Industrial & Field Services Kleen Performance Products SK Environmental Services Lodging Services Oil and Gas Field Services Totals Balance at January 1, 2016 $ 49,267 $ 105,286 $ 49,755 $ 216,589 $ 32,208 $ — $ 453,105 Measurement period adjustment from prior acquisitions — — — 2,095 — — 2,095 Foreign currency translation and other (573 ) 1,351 388 2,170 2,106 — 5,442 Balance at March 31, 2016 $ 48,694 $ 106,637 $ 50,143 $ 220,854 $ 34,314 $ — $ 460,642
Summary of amortizable other intangible assets	As of March 31, 2016 and December 31, 2015, the Company's finite-lived and indefinite-lived intangible assets consisted of the following (in thousands): March 31, 2016 December 31, 2015 Cost Accumulated Net Weighted Cost Accumulated Net Weighted Permits $ 164,160 $ 63,179 $ 100,981 18.3 $ 161,396 $ 61,142 $ 100,254 19.0 Customer and supplier relationships 379,339 108,612 270,727 9.7 374,866 99,463 275,403 10.1 Other intangible assets 32,856 24,990 7,866 1.3 31,416 22,581 8,835 1.5 Total amortizable permits and other intangible assets 576,355 196,781 379,574 9.6 567,678 183,186 384,492 10.0 Trademarks and trade names 122,958 — 122,958 Indefinite 122,326 — 122,326 Indefinite Total permits and other intangible assets $ 699,313 $ 196,781 $ 502,532 $ 690,004 $ 183,186 $ 506,818
Schedule of expected amortization for the net carrying amount of finite lived intangible assets	The expected amortization of the net carrying amount of finite-lived intangible assets at March 31, 2016 was as follows (in thousands): Years Ending December 31, Expected Amortization 2016 (nine months) $ 29,251 2017 33,936 2018 31,156 2019 28,438 2020 25,719 Thereafter 231,074 $ 379,574

ACCRUED EXPENSES (Tables)

ACCRUED EXPENSES (Tables)	3 Months Ended
	Mar. 31, 2016
Payables and Accruals [Abstract]
Accrued expenses	Accrued expenses consisted of the following at March 31, 2016 and December 31, 2015 (in thousands): March 31, 2016 December 31, 2015 Insurance $ 54,999 $ 55,899 Interest 21,864 20,500 Accrued compensation and benefits 40,690 35,646 Income, real estate, sales and other taxes 36,103 37,095 Other 37,936 44,520 $ 191,592 $ 193,660

CLOSURE AND POST-CLOSURE LIAB34

CLOSURE AND POST-CLOSURE LIABILITIES (Tables)	3 Months Ended
	Mar. 31, 2016
Asset Retirement Obligation Disclosure [Abstract]
Schedule of closure and post-closure liabilities	The changes to closure and post-closure liabilities (also referred to as “asset retirement obligations”) from January 1, 2016 through March 31, 2016 were as follows (in thousands): Landfill Non-Landfill Total Balance at January 1, 2016 $ 32,023 $ 24,226 $ 56,249 Adjustments during the measurement period related to acquisitions — 657 657 New asset retirement obligations 621 — 621 Accretion 691 567 1,258 Changes in estimates recorded to statement of operations (283 ) (132 ) (415 ) Expenditures (112 ) (391 ) (503 ) Currency translation and other 156 67 223 Balance at March 31, 2016 $ 33,096 $ 24,994 $ 58,090

REMEDIAL LIABILITIES (Tables)

REMEDIAL LIABILITIES (Tables)	3 Months Ended
	Mar. 31, 2016
Environmental Remediation Obligations [Abstract]
Changes to remedial liabilities	The changes to remedial liabilities for the three months ended March 31, 2016 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, 2016 $ 2,327 $ 63,613 $ 66,052 $ 131,992 Accretion 26 678 543 1,247 Changes in estimates recorded to statement of operations 71 (101 ) 350 320 Expenditures (26 ) (956 ) (2,033 ) (3,015 ) Currency translation and other — 51 784 835 Balance at March 31, 2016 $ 2,398 $ 63,285 $ 65,696 $ 131,379

FINANCING ARRANGEMENTS (Tables)

FINANCING ARRANGEMENTS (Tables)	3 Months Ended
	Mar. 31, 2016
Debt Disclosure [Abstract]
Summary of the entity's financial arrangements	The following table is a summary of the Company’s financing arrangements (in thousands): March 31, 2016 December 31, 2015 Senior unsecured notes, at 5.25%, due August 1, 2020 ("2020 Notes") $ 800,000 $ 800,000 Senior unsecured notes, at 5.125%, due June 1, 2021 ("2021 Notes") 845,000 595,000 Long-term obligations, at par $ 1,645,000 $ 1,395,000 Unamortized debt issuance costs and premium, net (13,397 ) (12,457 ) Long-term obligations, at carrying value $ 1,631,603 $ 1,382,543

LOSS PER SHARE (Tables)

LOSS PER SHARE (Tables)	3 Months Ended
	Mar. 31, 2016
Earnings Per Share [Abstract]
Reconciliation of basic and diluted earnings per share computations	The following are computations of basic and diluted loss per share (in thousands except for per share amounts): Three Months Ended March 31, 2016 2015 Numerator for basic and diluted earnings per share: Net loss $ (20,871 ) $ (7,089 ) Denominator: Basic shares outstanding 57,617 58,875 Dilutive shares outstanding 57,617 58,875 Basic loss per share: $ (0.36 ) $ (0.12 ) Diluted loss per share: $ (0.36 ) $ (0.12 )

ACCUMULATED OTHER COMPREHENSI38

ACCUMULATED OTHER COMPREHENSIVE LOSS (Tables)	3 Months Ended
	Mar. 31, 2016
Equity [Abstract]
Schedule of accumulated other comprehensive loss	The changes in accumulated other comprehensive loss by component and related tax effects for the three months ended March 31, 2016 were as follows (in thousands): Foreign Currency Translation Unfunded Pension Liability Total Balance at January 1, 2016 $ (252,939 ) $ (1,953 ) $ (254,892 ) Other comprehensive income before reclassifications 45,837 — 45,837 Other comprehensive income $ 45,837 $ — $ 45,837 Balance at March 31, 2016 $ (207,102 ) $ (1,953 ) $ (209,055 )

STOCK-BASED COMPENSATION (Table

STOCK-BASED COMPENSATION (Tables)	3 Months Ended
	Mar. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Summary of total number, weighted-average grant-date fair value, and types of awards granted	The following table summarizes information about restricted stock awards for the three months ended March 31, 2016 : Restricted Stock Number of Shares Weighted Average Grant-Date Fair Value Balance at January 1, 2016 362,618 $ 55.79 Granted 43,771 $ 43.87 Vested (85,388 ) $ 55.79 Forfeited (15,346 ) $ 57.20 Balance at March 31, 2016 305,655 $ 54.01
Summary of performance stock awards	The following table summarizes information about performance stock awards for the three months ended March 31, 2016 : Performance Stock Number of Shares Weighted Average Grant-Date Fair Value Balance at January 1, 2016 187,274 $ 57.13 Vested (8,420 ) $ 61.90 Forfeited (10,191 ) $ 57.65 Balance at March 31, 2016 168,663 $ 56.86

SEGMENT REPORTING (Tables)

SEGMENT REPORTING (Tables)	3 Months Ended
	Mar. 31, 2016
Segment Reporting [Abstract]
Reconciliation of third party revenues to direct revenues	The following table reconciles third party revenues to direct revenues for the three months ended March 31, 2016 and 2015 (in thousands): For the Three Months Ended March 31, 2016 For the Three Months Ended March 31, 2015 Third party revenues Intersegment revenues, net Corporate Items, net Direct revenues Third party revenues Intersegment revenues, net Corporate Items, net Direct revenues Technical Services $ 219,105 $ 34,844 $ 388 $ 254,337 $ 240,325 $ 34,904 $ 1,297 $ 276,526 Industrial and Field Services 121,577 (7,466 ) (17 ) 114,094 146,868 (6,561 ) 78 140,385 Kleen Performance Products 67,543 (9,407 ) (1 ) 58,135 96,807 (18,257 ) (1 ) 78,549 SK Environmental Services 179,418 (19,114 ) 367 160,671 160,684 (11,582 ) — 149,102 Lodging Services 15,645 264 21 15,930 34,104 164 17 34,285 Oil and Gas Field Services 32,016 879 87 32,982 53,587 1,332 9 54,928 Corporate Items 779 — (845 ) (66 ) 124 — (1,400 ) (1,276 ) Total $ 636,083 $ — $ — $ 636,083 $ 732,499 $ — $ — $ 732,499
Reconciliation to consolidated statements of income to adjusted EBITDA	The following table presents Adjusted EBITDA information used by management by reported segment (in thousands). The Company does not allocate interest expense, income taxes, depreciation, amortization, accretion of environmental liabilities, other non-cash charges not deemed representative of fundamental segment results, and other expense (income) to its segments. For the Three Months Ended March 31, 2016 2015 Adjusted EBITDA: Technical Services $ 60,398 $ 63,401 Industrial and Field Services 2,118 10,309 Kleen Performance Products 4,560 (4,476 ) SK Environmental Services 35,495 27,249 Lodging Services 1,019 6,910 Oil and Gas Field Services (1,394 ) 1,403 Corporate Items (34,876 ) (26,519 ) Total $ 67,320 $ 78,277 Reconciliation to Consolidated Statements of Operations: Accretion of environmental liabilities 2,505 2,619 Depreciation and amortization 68,902 68,356 (Loss) income from operations (4,087 ) 7,302 Other expense (income) 350 (409 ) Interest expense, net of interest income 18,980 19,438 Loss before benefit for income taxes $ (23,417 ) $ (11,727 )
PP&E, intangible assets and total assets by segment	The following table presents certain assets by reportable segment and in the aggregate (in thousands): March 31, 2016 Technical Industrial and Field Kleen Performance Products SK Environmental Services Lodging Services Oil and Gas Field Corporate Totals Property, plant and equipment, net $ 499,464 $ 234,088 $ 202,445 $ 306,462 $ 108,489 $ 153,869 $ 92,055 $ 1,596,872 Goodwill 48,694 106,637 50,143 220,854 34,314 — — 460,642 Permits and other intangible, net 73,632 14,215 139,725 254,230 7,004 13,726 — 502,532 Total assets $ 818,098 $ 378,639 $ 501,019 $ 858,544 $ 188,547 $ 243,543 $ 653,285 $ 3,641,675 December 31, 2015 Technical Industrial and Field Kleen Performance Products SK Environmental Services Lodging Services Oil and Gas Field Corporate Totals Property, plant and equipment, net $ 483,425 $ 237,660 $ 193,855 $ 264,539 $ 105,208 $ 156,286 $ 91,494 $ 1,532,467 Goodwill 49,267 105,286 49,755 216,589 32,208 — — 453,105 Permits and other intangible, net 73,601 14,649 140,410 256,251 7,045 14,862 — 506,818 Total assets $ 800,060 $ 368,858 $ 492,483 $ 805,488 $ 181,357 $ 244,210 $ 538,972 $ 3,431,428
Total assets by geographical area	The following table presents total assets by geographical area (in thousands): March 31, 2016 December 31, 2015 United States $ 2,783,892 $ 2,575,746 Canada 853,112 851,949 Other foreign 4,671 3,733 Total $ 3,641,675 $ 3,431,428

GUARANTOR AND NON-GUARANTOR S41

GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION (Tables)	3 Months Ended
	Mar. 31, 2016
Guarantor and Non-Guarantor Subsidiaries Financial Information [Abstract]
Schedule of condensed consolidating balance sheet	Following is the condensed consolidating balance sheet at March 31, 2016 (in thousands): Clean Harbors, Inc. U.S. Guarantor Subsidiaries Foreign Non-Guarantor Subsidiaries Consolidating Adjustments Total Assets: Cash and cash equivalents $ 56,028 $ 219,856 $ 79,461 $ — $ 355,345 Intercompany receivables 172,776 283,034 38,065 (493,875 ) — Accounts receivable, net — 380,873 77,428 — 458,301 Other current assets — 185,171 64,804 — 249,975 Property, plant and equipment, net — 1,129,262 467,610 — 1,596,872 Investments in subsidiaries 2,832,086 524,500 — (3,356,586 ) — Intercompany debt receivable — 278,018 3,701 (281,719 ) — Goodwill — 369,400 91,242 — 460,642 Permits and other intangibles, net — 429,388 73,144 — 502,532 Other long-term assets 1,626 9,457 6,925 — 18,008 Total assets $ 3,062,516 $ 3,808,959 $ 902,380 $ (4,132,180 ) $ 3,641,675 Liabilities and Stockholders’ Equity: Current liabilities $ 22,124 $ 382,100 $ 61,286 $ — $ 465,510 Intercompany payables 288,515 203,542 1,818 (493,875 ) — Closure, post-closure and remedial liabilities, net — 152,767 15,205 — 167,972 Long-term obligations 1,631,603 — — — 1,631,603 Intercompany debt payable 3,701 — 278,018 (281,719 ) — Other long-term liabilities — 238,464 21,553 — 260,017 Total liabilities 1,945,943 976,873 377,880 (775,594 ) 2,525,102 Stockholders’ equity 1,116,573 2,832,086 524,500 (3,356,586 ) 1,116,573 Total liabilities and stockholders’ equity $ 3,062,516 $ 3,808,959 $ 902,380 $ (4,132,180 ) $ 3,641,675 Following is the condensed consolidating balance sheet at December 31, 2015 (in thousands): Clean Harbors, Inc. U.S. Guarantor Subsidiaries Foreign Non-Guarantor Subsidiaries Consolidating Adjustments Total Assets: Cash and cash equivalents $ 11,017 $ 83,479 $ 90,212 $ — $ 184,708 Intercompany receivables 164,709 213,243 39,804 (417,756 ) — Accounts receivables — 404,580 91,424 — 496,004 Other current assets — 179,969 60,515 — 240,484 Property, plant and equipment, net — 1,082,466 450,001 — 1,532,467 Investments in subsidiaries 2,547,307 522,067 — (3,069,374 ) — Intercompany debt receivable — 260,957 3,701 (264,658 ) — Goodwill — 367,306 85,799 — 453,105 Permits and other intangibles, net — 435,080 71,738 — 506,818 Other long-term assets 1,068 10,274 6,500 — 17,842 Total assets $ 2,724,101 $ 3,559,421 $ 899,694 $ (3,751,788 ) $ 3,431,428 Liabilities and Stockholders’ Equity: Current liabilities $ 20,813 $ 424,588 $ 71,719 $ — $ 517,120 Intercompany payables 220,762 195,287 1,707 (417,756 ) — Closure, post-closure and remedial liabilities, net — 153,190 14,656 — 167,846 Long-term obligations 1,382,543 — — — 1,382,543 Intercompany debt payable 3,701 — 260,957 (264,658 ) — Other long-term liabilities — 239,049 28,588 — 267,637 Total liabilities 1,627,819 1,012,114 377,627 (682,414 ) 2,335,146 Stockholders’ equity 1,096,282 2,547,307 522,067 (3,069,374 ) 1,096,282 Total liabilities and stockholders’ equity $ 2,724,101 $ 3,559,421 $ 899,694 $ (3,751,788 ) $ 3,431,428
Schedule of consolidating statement of income	Following is the consolidating statement of operations for the three months ended March 31, 2016 (in thousands): Clean Harbors, Inc. U.S. Guarantor Subsidiaries Foreign Non-Guarantor Subsidiaries Consolidating Adjustments Total Revenues Service revenues $ — $ 428,477 $ 114,023 $ (12,269 ) $ 530,231 Product revenues — 89,588 18,713 (2,449 ) 105,852 Total revenues — 518,065 132,736 (14,718 ) 636,083 Cost of revenues (exclusive of items shown separately below) Service cost of revenues — 282,964 103,291 (12,269 ) 373,986 Product cost of revenues — 79,354 13,388 (2,449 ) 90,293 Total cost of revenues — 362,318 116,679 (14,718 ) 464,279 Selling, general and administrative expenses 24 80,655 23,805 — 104,484 Accretion of environmental liabilities — 2,290 215 — 2,505 Depreciation and amortization — 48,695 20,207 — 68,902 (Loss) income from operations (24 ) 24,107 (28,170 ) — (4,087 ) Other expense — (88 ) (262 ) — (350 ) Interest (expense) income (20,143 ) 1,111 52 — (18,980 ) Equity in earnings of subsidiaries, net of taxes (8,771 ) (26,495 ) — 35,266 — Intercompany interest income (expense) — 5,159 (5,159 ) — — (Loss) income before (benefit) provision for income taxes (28,938 ) 3,794 (33,539 ) 35,266 (23,417 ) (Benefit) provision for income taxes (8,067 ) 12,565 (7,044 ) — (2,546 ) Net loss (20,871 ) (8,771 ) (26,495 ) 35,266 (20,871 ) Other comprehensive income 45,837 45,837 28,927 (74,764 ) 45,837 Comprehensive income $ 24,966 $ 37,066 $ 2,432 $ (39,498 ) $ 24,966 Following is the consolidating statement of operations for the three months ended March 31, 2015 (in thousands): Clean Harbors, Inc. U.S. Guarantor Subsidiaries Foreign Non-Guarantor Subsidiaries Consolidating Adjustments Total Revenues Service revenues $ — $ 418,517 $ 193,453 $ (15,640 ) $ 596,330 Product revenues — 116,536 23,204 (3,571 ) 136,169 Total revenues — 535,053 216,657 (19,211 ) 732,499 Cost of revenues (exclusive of items shown separately below) Service cost of revenues — 277,602 154,428 (15,640 ) 416,390 Product cost of revenues — 115,286 18,402 (3,571 ) 130,117 Total cost of revenues — 392,888 172,830 (19,211 ) 546,507 Selling, general and administrative expenses 25 80,984 26,706 — 107,715 Accretion of environmental liabilities — 2,306 313 — 2,619 Depreciation and amortization — 45,801 22,555 — 68,356 (Loss) income from operations (25 ) 13,074 (5,747 ) — 7,302 Other income (expense) — 111 298 — 409 Interest (expense) income (19,639 ) 178 23 — (19,438 ) Equity in earnings of subsidiaries, net of taxes 4,709 (7,029 ) — 2,320 — Intercompany interest income (expense) — 5,977 (5,977 ) — — (Loss) income before (benefit) provision for income taxes (14,955 ) 12,311 (11,403 ) 2,320 (11,727 ) (Benefit) provision for income taxes (7,866 ) 7,602 (4,374 ) — (4,638 ) Net (loss) income (7,089 ) 4,709 (7,029 ) 2,320 (7,089 ) Other comprehensive loss (77,403 ) (77,403 ) (50,635 ) 128,038 (77,403 ) Comprehensive loss $ (84,492 ) $ (72,694 ) $ (57,664 ) $ 130,358 $ (84,492 )
Schedule of condensed consolidating statement of cash flows	Following is the condensed consolidating statement of cash flows for the three months ended March 31, 2016 (in thousands): Clean Harbors, Inc. U.S. Guarantor Subsidiaries Foreign Non-Guarantor Subsidiaries Consolidating Adjustments Total Net cash from (used in) operating activities $ 47,201 $ (3,361 ) $ (4,551 ) $ — $ 39,289 Cash flows used in investing activities: Additions to property, plant and equipment — (64,754 ) (11,027 ) — (75,781 ) Proceeds from sales of fixed assets — 277 996 — 1,273 Acquisitions, net of cash acquired — (34,993 ) — — (34,993 ) Costs to obtain or renew permits — (465 ) (47 ) — (512 ) Investment in subsidiaries (250,625 ) — — 250,625 — Intercompany — (6,423 ) — 6,423 — Net cash used in investing activities (250,625 ) (106,358 ) (10,078 ) 257,048 (110,013 ) Cash flows from (used in) financing activities: Change in uncashed checks — (4,529 ) (689 ) — (5,218 ) Issuance of restricted shares, net of shares remitted (1,425 ) — — — (1,425 ) Repurchases of common stock (4,998 ) — — — (4,998 ) Deferred financing costs paid (2,190 ) — — — (2,190 ) Issuance of senior secured notes, including premium 250,625 250,625 — (250,625 ) 250,625 Intercompany 6,423 — — (6,423 ) — Net cash from (used in) financing activities 248,435 246,096 (689 ) (257,048 ) 236,794 Effect of exchange rate change on cash — — 4,567 — 4,567 Increase (decrease) in cash and cash equivalents 45,011 136,377 (10,751 ) — 170,637 Cash and cash equivalents, beginning of period 11,017 83,479 90,212 — 184,708 Cash and cash equivalents, end of period $ 56,028 $ 219,856 $ 79,461 $ — $ 355,345 Following is the condensed consolidating statement of cash flows for the three months ended March 31, 2015 (in thousands): Clean Harbors, Inc. U.S. Guarantor Subsidiaries Foreign Non-Guarantor Subsidiaries Consolidating Adjustments Total Net cash (used in) from operating activities $ (8,032 ) $ 85,311 $ 7,498 $ — $ 84,777 Cash flows used in investing activities: Additions to property, plant and equipment — (37,670 ) (15,279 ) — (52,949 ) Proceeds from sale of fixed assets — 113 647 — 760 Costs to obtain or renew permits — — (1,171 ) — (1,171 ) Intercompany — (108,435 ) — 108,435 — Net cash used in investing activities — (145,992 ) (15,803 ) 108,435 (53,360 ) Cash flows from (used in) financing activities: Change in uncashed checks — (14,694 ) (5,574 ) — (20,268 ) Issuance of restricted shares, net of shares remitted (1,154 ) — — — (1,154 ) Repurchases of common stock (15,379 ) — — — (15,379 ) Excess tax benefit of stock-based compensation 5 — — — 5 Payments of capital leases — (164 ) (234 ) — (398 ) Intercompany 108,435 — — (108,435 ) — Net cash from (used in) financing activities 91,907 (14,858 ) (5,808 ) (108,435 ) (37,194 ) Effect of exchange rate change on cash — — (7,363 ) — (7,363 ) Decrease in cash and cash equivalents 83,875 (75,539 ) (21,476 ) — (13,140 ) Cash and cash equivalents, beginning of period 1,006 154,147 91,726 — 246,879 Cash and cash equivalents, end of period $ 84,881 $ 78,608 $ 70,250 $ — $ 233,739

BUSINESS COMBINATIONS (Narrativ

BUSINESS COMBINATIONS (Narrative) (Details) - USD ($) $ in Millions	Feb. 03, 2016	Apr. 11, 2015	Dec. 31, 2015	Mar. 31, 2016
Nevada Rerefinery Facility
Business Acquisition [Line Items]
Purchase price	$ 35
Thermo Fluids Inc.
Business Acquisition [Line Items]
Purchase price		$ 79.3
TFI's revenues included in the Company's results of operations				$ 7.8
Privately Owned Domestic Company
Business Acquisition [Line Items]
Payments to acquire business			$ 14.7
Goodwill, acquired during period			$ 7.4

BUSINESS COMBINATIONS (Assets A

BUSINESS COMBINATIONS (Assets Aquired and Liabilities Assumed) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Apr. 11, 2015
Business Acquisition [Line Items]
Goodwill	$ 460,642	$ 453,105
Thermo Fluids Inc.
Business Acquisition [Line Items]
Accounts receivable	7,301		$ 7,109
Measurement period adjustments, accounts receivable	192
Inventories and supplies	1,791		1,791
Measurement period adjustment, inventories and supplies	0
Prepaid and other current assets	665		1,749
Measurement period adjustment, prepaid and other current assets	(1,084)
Property, plant and equipment	27,641		30,468
Measurement period adjustments, property, plant and equipment	(2,827)
Permits and other intangibles	18,100		20,000
Measurement period adjustments, permits and other intangibles	(1,900)
Current liabilities	(5,884)		(5,859)
Measurement period adjustments, current liabilities	(25)
Closure and post-closure liabilities	(2,333)		(1,676)
Measurement period adjustments, closure and post-closure liabilities	(657)
Deferred taxes, unrecognized tax benefits and other long-term liabilities	(9,174)		(13,081)
Measurement period adjustments, deferred taxes, unrecognized tax benefits and other long-term liabilities	3,907
Total identifiable net assets	38,107		40,501
Measurement period adjustments, total identifiable net assets	(2,394)
Goodwill	41,229		36,591
Measurement period adjustments, goodwill	4,638
Total	79,336		$ 77,092
Measurement period adjustments, total	$ 2,244

INVENTORIES AND SUPPLIES (Detai

INVENTORIES AND SUPPLIES (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Inventory Disclosure [Abstract]
Oil and oil products	$ 36,196	$ 33,603
Supplies and drums	79,035	78,132
Solvent and solutions	9,026	8,868
Modular camp accommodations	15,438	15,126
Other	15,073	13,792
Total inventories and supplies	$ 154,768	$ 149,521

PROPERTY, PLANT AND EQUIPMENT45

PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 2,834,092		$ 2,691,738
Less - accumulated depreciation and amortization	1,237,220		1,159,271
Total property, plant and equipment, net	1,596,872		1,532,467
Interest costs capitalized adjustment	1,200	$ 200
Depreciation inclusive of amortization	59,300	$ 57,400
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	101,460		100,582
Asset retirement costs (non-landfill)
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	12,188		12,434
Landfill assets
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	140,792		136,624
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	353,869		344,209
Camp equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	158,619		149,361
Vehicles
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	529,386		500,619
Equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,400,407		1,328,915
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	5,477		5,337
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 131,894		$ 113,657

GOODWILL AND OTHER INTANGIBLE46

GOODWILL AND OTHER INTANGIBLE ASSETS (Rollforward of Goodwill) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2016USD ($)
Goodwill [Roll Forward]
Balance at beginning of year	$ 453,105
Measurement period adjustment from prior acquisitions	2,095
Foreign currency translation and other	5,442
Balance at end of year	460,642
Technical Services
Goodwill [Roll Forward]
Balance at beginning of year	49,267
Balance at end of year	48,694
Industrial and Field Services
Goodwill [Roll Forward]
Balance at beginning of year	105,286
Balance at end of year	106,637
SK Environmental Services
Goodwill [Roll Forward]
Balance at beginning of year	216,589
Balance at end of year	220,854
Lodging Services
Goodwill [Roll Forward]
Balance at beginning of year	32,208
Balance at end of year	34,314
Oil and Gas Field Services
Goodwill [Roll Forward]
Balance at beginning of year	0
Balance at end of year	0
Operating Segments | Technical Services
Goodwill [Roll Forward]
Balance at beginning of year	49,267
Measurement period adjustment from prior acquisitions	0
Foreign currency translation and other	(573)
Balance at end of year	48,694
Operating Segments | Industrial and Field Services
Goodwill [Roll Forward]
Balance at beginning of year	105,286
Measurement period adjustment from prior acquisitions	0
Foreign currency translation and other	1,351
Balance at end of year	106,637
Operating Segments | Kleen Performance Products
Goodwill [Roll Forward]
Balance at beginning of year	49,755
Measurement period adjustment from prior acquisitions	0
Foreign currency translation and other	388
Balance at end of year	50,143
Operating Segments | SK Environmental Services
Goodwill [Roll Forward]
Balance at beginning of year	216,589
Measurement period adjustment from prior acquisitions	2,095
Foreign currency translation and other	2,170
Balance at end of year	220,854
Operating Segments | Lodging Services
Goodwill [Roll Forward]
Balance at beginning of year	32,208
Measurement period adjustment from prior acquisitions	0
Foreign currency translation and other	2,106
Balance at end of year	34,314
Operating Segments | Oil and Gas Field Services
Goodwill [Roll Forward]
Balance at beginning of year	0
Measurement period adjustment from prior acquisitions	0
Foreign currency translation and other	0
Balance at end of year	$ 0

GOODWILL AND OTHER INTANGIBLE47

GOODWILL AND OTHER INTANGIBLE ASSETS (Amortizable Other Intangible Assets) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Cost	$ 576,355	$ 567,678
Accumulated Amortization	196,781	183,186
Net	$ 379,574	$ 384,492
Weighted Average Remaining Amortization Period (in years)	9 years 223 days	10 years
Total permits and other intangible assets, Cost	$ 699,313	$ 690,004
Total permits and other intangible assets, Net	502,532	506,818
Trademarks and trade names
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible asset, cost	122,958	122,326
Permits
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Cost	164,160	161,396
Accumulated Amortization	63,179	61,142
Net	$ 100,981	$ 100,254
Weighted Average Remaining Amortization Period (in years)	18 years 117 days	19 years
Customer and supplier relationships
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Cost	$ 379,339	$ 374,866
Accumulated Amortization	108,612	99,463
Net	$ 270,727	$ 275,403
Weighted Average Remaining Amortization Period (in years)	9 years 266 days	10 years 30 days
Other intangible assets
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Cost	$ 32,856	$ 31,416
Accumulated Amortization	24,990	22,581
Net	$ 7,866	$ 8,835
Weighted Average Remaining Amortization Period (in years)	1 year 102 days	1 year 6 months

GOODWILL AND OTHER INTANGIBLE48

GOODWILL AND OTHER INTANGIBLE ASSETS (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of permits and other intangible assets	$ 9.6	$ 11

GOODWILL AND OTHER INTANGIBLE49

GOODWILL AND OTHER INTANGIBLE ASSETS (Expected Future Amortization) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
2016 (nine months)	$ 29,251
2,017	33,936
2,018	31,156
2,019	28,438
2,020	25,719
Thereafter	231,074
Net	$ 379,574	$ 384,492

ACCRUED EXPENSES (Details)

ACCRUED EXPENSES (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Payables and Accruals [Abstract]
Insurance	$ 54,999	$ 55,899
Interest	21,864	20,500
Accrued compensation and benefits	40,690	35,646
Income, real estate, sales and other taxes	36,103	37,095
Other	37,936	44,520
Total accrued expenses	$ 191,592	$ 193,660

CLOSURE AND POST-CLOSURE LIAB51

CLOSURE AND POST-CLOSURE LIABILITIES (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2016USD ($)
Changes to post-closure liabilities
Balance at January 1, 2016	$ 56,249
Adjustments during the measurement period related to acquisitions	657
New asset retirement obligations	621
Accretion	1,258
Changes in estimates recorded to statement of operations	(415)
Expenditures	(503)
Currency translation and other	223
Balance at March 31, 2016	$ 58,090
Credit-adjusted risk-free rate (as a percent)	6.23%
Landfill Retirement Liability
Changes to post-closure liabilities
Balance at January 1, 2016	$ 32,023
Adjustments during the measurement period related to acquisitions	0
New asset retirement obligations	621
Accretion	691
Changes in estimates recorded to statement of operations	(283)
Expenditures	(112)
Currency translation and other	156
Balance at March 31, 2016	33,096
Non-Landfill Retirement Liability
Changes to post-closure liabilities
Balance at January 1, 2016	24,226
Adjustments during the measurement period related to acquisitions	657
New asset retirement obligations	0
Accretion	567
Changes in estimates recorded to statement of operations	(132)
Expenditures	(391)
Currency translation and other	67
Balance at March 31, 2016	$ 24,994

REMEDIAL LIABILITIES (Details)

REMEDIAL LIABILITIES (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2016USD ($)
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at beginning of year	$ 131,992
Accretion	1,247
Changes in estimates recorded to statement of operations	320
Expenditures	(3,015)
Currency translation and other	835
Balance at end of year	131,379
Remedial Liabilities for Landfill Sites
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at beginning of year	2,327
Accretion	26
Changes in estimates recorded to statement of operations	71
Expenditures	(26)
Currency translation and other	0
Balance at end of year	2,398
Remedial Liabilities for Inactive Sites
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at beginning of year	63,613
Accretion	678
Changes in estimates recorded to statement of operations	(101)
Expenditures	(956)
Currency translation and other	51
Balance at end of year	63,285
Remedial Liabilities (Including Superfund) for Non-Landfill Operations
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at beginning of year	66,052
Accretion	543
Changes in estimates recorded to statement of operations	350
Expenditures	(2,033)
Currency translation and other	784
Balance at end of year	$ 65,696

FINANCING ARRANGEMENTS (Details

FINANCING ARRANGEMENTS (Details) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 14, 2016	Dec. 31, 2015	Dec. 07, 2012
Financing arrangements
Long-term obligations, at par	$ 1,645,000,000		$ 1,395,000,000
Unamortized debt issuance costs and premium, net	(13,397,000)		(12,457,000)
Long-term obligations, at carrying value	1,631,603,000		1,382,543,000
Revolving credit facility, amount outstanding	0		0
Line of credit facility available borrowing capacity	156,400,000		178,500,000
Letters of credit amount outstanding	$ 145,200,000		144,600,000
Parent and domestic subsidiaries
Financing arrangements
Credit available subject to percentage of accounts receivable	85.00%
Credit available subject to percentage of cash deposited	100.00%
Canadian subsidiaries
Financing arrangements
Credit available subject to percentage of accounts receivable	85.00%
Credit available subject to percentage of cash deposited	100.00%
Unsecured debt | Unsecured senior notes 2020
Financing arrangements
Long-term obligations, at par	$ 800,000,000		$ 800,000,000
Debt instrument, interest rate, stated percentage	5.25%		5.25%
Fair value	$ 814,000,000		$ 812,000,000
Unsecured debt | Unsecured senior notes 2021
Financing arrangements
Long-term obligations, at par	$ 845,000,000		$ 595,000,000
Debt instrument, interest rate, stated percentage	5.125%		5.125%	5.125%
Fair value	$ 853,500,000		$ 599,500,000
Issuance of debt	$ 250,000,000	$ 250,000,000		$ 600,000,000

LOSS PER SHARE (Computation of

LOSS PER SHARE (Computation of Basic and Diluted Earnings Per Share)(Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Numerator for basic and diluted earnings per share:
Net loss	$ (20,871)	$ (7,089)
Denominator:
Basic shares outstanding	57,617	58,875
Dilutive shares outstanding	57,617	58,875
Basic loss per share (in USD per share)	$ (0.36)	$ (0.12)
Diluted loss per share (in USD per share)	$ (0.36)	$ (0.12)

LOSS PER SHARE (Narrative) (Det

LOSS PER SHARE (Narrative) (Details) - shares	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Earnings Per Share [Abstract]
Shares excluded from computation of earning per share (in shares)	474,318	539,983

ACCUMULATED OTHER COMPREHENSI56

ACCUMULATED OTHER COMPREHENSIVE LOSS (Changes in Accumulated Other Comprehensive Loss by Component) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Components of Other Accumulated Income, Net of Tax [Roll Forward]
Balance at beginning of period	$ 1,096,282
Other comprehensive income	45,837	$ (77,403)
Balance at end of period	1,116,573
Foreign Currency Translation
Components of Other Accumulated Income, Net of Tax [Roll Forward]
Balance at beginning of period	(252,939)
Other comprehensive income before reclassifications	45,837
Other comprehensive income	45,837
Balance at end of period	(207,102)
Unfunded Pension Liability
Components of Other Accumulated Income, Net of Tax [Roll Forward]
Balance at beginning of period	(1,953)
Other comprehensive income before reclassifications	0
Other comprehensive income	0
Balance at end of period	(1,953)
Accumulated Other Comprehensive Loss
Components of Other Accumulated Income, Net of Tax [Roll Forward]
Balance at beginning of period	(254,892)
Other comprehensive income before reclassifications	45,837
Other comprehensive income	45,837
Balance at end of period	$ (209,055)

ACCUMULATED OTHER COMPREHENSI57

ACCUMULATED OTHER COMPREHENSIVE LOSS (Amount Reclassified Out of Accumulated Other Comprehensive Loss) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Equity [Abstract]
Reclassifications out of accumulated other comprehensive income	$ 0	$ 0

STOCK-BASED COMPENSATION (Narra

STOCK-BASED COMPENSATION (Narrative) (Details) - USD ($) shares in Thousands	3 Months Ended		13 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 13, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	$ 2,100,000	$ 1,800,000
Income tax benefit	500,000	500,000
Share repurchase program shares authorized				$ 300,000,000
Repurchases of common stock (in shares)			3,500
Repurchases of common stock	4,998,000		$ 182,700,000
Stock repurchase program, remaining authorized repurchase amount	$ 117,300,000		117,300,000
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restriction period	3 years
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restriction period	5 years
Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	$ 12,400,000		12,400,000
Period for recognition	2 years 329 days
Fair value restricted stock	$ 3,800,000	3,200,000
Performance stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	600,000		$ 600,000
Fair value restricted stock	$ 400,000	$ 300,000
Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Repurchases of common stock (in shares)	104
Repurchases of common stock	$ 1,000

STOCK-BASED COMPENSATION (Restr

STOCK-BASED COMPENSATION (Restricted Stock) (Details) - Restricted stock awards	3 Months Ended
	Mar. 31, 2016$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Number of shares beginning balance | shares	362,618
Number of shares, granted | shares	43,771
Number of shares, vested | shares	(85,388)
Number of shares, forfeited | shares	(15,346)
Number of shares ending balance | shares	305,655
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted average grant-date fair value beginning of period (in USD per share) | $ / shares	$ 55.79
Weighted average grant-date fair value, granted (in USD per share) | $ / shares	43.87
Weighted average grant-date fair value, vested (in USD per share) | $ / shares	55.79
Weighted average grant-date fair value, forfeited (in USD per share) | $ / shares	57.20
Weighted average grant-date fair value end of period (in USD per share) | $ / shares	$ 54.01

STOCK-BASED COMPENSATION (Perfo

STOCK-BASED COMPENSATION (Performance Stock Awards (Details) - Performance stock awards	3 Months Ended
	Mar. 31, 2016$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Number of shares beginning balance | shares	187,274
Number of shares, vested | shares	(8,420)
Number of shares, forfeited | shares	(10,191)
Number of shares ending balance | shares	168,663
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted average grant-date fair value beginning of period (in USD per share) | $ / shares	$ 57.13
Weighted average grant-date fair value, vested (in USD per share) | $ / shares	61.90
Weighted average grant-date fair value, forfeited (in USD per share) | $ / shares	57.65
Weighted average grant-date fair value end of period (in USD per share) | $ / shares	$ 56.86

COMMITMENTS AND CONTINGENCIES (

COMMITMENTS AND CONTINGENCIES (Details) CAD in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2016USD ($)siteproceedingclaimfacility	Dec. 31, 2012CAD	Dec. 31, 2002a	Dec. 31, 1999municipality	Dec. 31, 1968permit	Dec. 31, 2015USD ($)proceeding
Contingencies [Line Items]
Recorded reserves for actual or probable liabilities | $	$ 20,900,000					$ 21,900,000
Number of pending personal injury claims allegedly resulting from the used of Safety-Kleen's products | proceeding	60
Number of product liability claims settled or dismissed | claim	9
Legal and Administrative Proceedings
Contingencies [Line Items]
Recorded reserves for actual or probable liabilities | $	$ 18,700,000					18,900,000
Possible increase in legal and administrative proceedings | $	$ 1,800,000					1,900,000
Ville Mercier
Contingencies [Line Items]
Number of permits issued by government, for dumping organic liquid | permit					2
Number of neighboring municipalities filing separate legal proceedings against the Mercier Subsidiary and the Government of Quebec | municipality				3
General damages sought | CAD		CAD 2.9
Punitive damages sought | CAD		CAD 10
Superfund Proceedings
Contingencies [Line Items]
Number of sites owned by third party excluded from cleanup or related liabilities	129
Number of sites owned by the entity subject to proceedings under federal or state superfund laws | facility	2
Notices received from owners of third party sites seeking indemnification from the company	127
Number of sites for which environmental remediation expense is settled	32
Third party sites requiring expenditure on remediation	17
Number of sites not currently requiring expenditures on remediation	78
Number of sites which potential liability could exceed $100,000	13
Notices received from owners of third party sites seeking indemnification from the company	6
Superfund Proceedings | Minimum
Contingencies [Line Items]
Minimum potential liability | $	$ 100,000
Wichita Property
Contingencies [Line Items]
State-designated superfund site acquired, total acres | a			1,400
Certain Other Third Party Sites
Contingencies [Line Items]
Indemnification agreement with third party sites	11
Kleen Performance Products
Contingencies [Line Items]
Notices received from owners of third party sites seeking indemnification from the company	17
Federal and State Enforcement Actions
Contingencies [Line Items]
Recorded reserves for actual or probable liabilities | $	$ 2,200,000					$ 3,000,000
Number of pending personal injury claims allegedly resulting from the used of Safety-Kleen's products | proceeding	5					6
Federal and State Enforcement Actions | Minimum
Contingencies [Line Items]
Minimum potential liability | $	$ 100,000					$ 100,000

INCOME TAXES (Details)

INCOME TAXES (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Effective tax rates	10.90%	39.50%
Unrecognized tax benefits	$ 2.1		$ 2.1
Interest on unrecognized tax benefits	0.4		$ 0.4
Decrease in unrecognized tax benefits expected in next 12 months	$ 0.5

SEGMENT REPORTING (Narrative) (

SEGMENT REPORTING (Narrative) (Details)	3 Months Ended
	Mar. 31, 2016segment
Segment Reporting [Abstract]
Number of reportable segments	6
Number of operations not managed by reportable segments	2

SEGMENT REPORTING (Third Party

SEGMENT REPORTING (Third Party Reveunes to Direct Revenues) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Segment Reporting Information [Line Items]
Total revenues	$ 636,083	$ 732,499
Third party revenues
Segment Reporting Information [Line Items]
Total revenues	636,083	732,499
Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	0	0
Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	0	0
Direct revenues
Segment Reporting Information [Line Items]
Total revenues	636,083	732,499
Technical Services | Third party revenues
Segment Reporting Information [Line Items]
Total revenues	219,105	240,325
Technical Services | Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	34,844	34,904
Technical Services | Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	388	1,297
Technical Services | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	254,337	276,526
Industrial and Field Services | Third party revenues
Segment Reporting Information [Line Items]
Total revenues	121,577	146,868
Industrial and Field Services | Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	(7,466)	(6,561)
Industrial and Field Services | Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	(17)	78
Industrial and Field Services | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	114,094	140,385
Kleen Performance Products | Third party revenues
Segment Reporting Information [Line Items]
Total revenues	67,543	96,807
Kleen Performance Products | Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	(9,407)	(18,257)
Kleen Performance Products | Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	(1)	(1)
Kleen Performance Products | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	58,135	78,549
SK Environmental Services | Third party revenues
Segment Reporting Information [Line Items]
Total revenues	179,418	160,684
SK Environmental Services | Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	(19,114)	(11,582)
SK Environmental Services | Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	367	0
SK Environmental Services | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	160,671	149,102
Lodging Services | Third party revenues
Segment Reporting Information [Line Items]
Total revenues	15,645	34,104
Lodging Services | Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	264	164
Lodging Services | Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	21	17
Lodging Services | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	15,930	34,285
Oil and Gas Field Services | Third party revenues
Segment Reporting Information [Line Items]
Total revenues	32,016	53,587
Oil and Gas Field Services | Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	879	1,332
Oil and Gas Field Services | Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	87	9
Oil and Gas Field Services | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	32,982	54,928
Corporate Items | Third party revenues
Segment Reporting Information [Line Items]
Total revenues	779	124
Corporate Items | Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	0	0
Corporate Items | Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	(845)	(1,400)
Corporate Items | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	$ (66)	$ (1,276)

SEGMENT REPORTING (Adjusted EBI

SEGMENT REPORTING (Adjusted EBITDA Information) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Segment Reporting Information [Line Items]
Income (loss) from continuing operations	$ 67,320	$ 78,277
Accretion of environmental liabilities	2,505	2,619
Depreciation and amortization	68,902	68,356
(Loss) income from operations	(4,087)	7,302
Other expense (income)	350	(409)
Interest expense, net of interest income	18,980	19,438
(Loss) income before (benefit) provision for income taxes	(23,417)	(11,727)
Technical Services
Segment Reporting Information [Line Items]
Income (loss) from continuing operations	60,398	63,401
Industrial and Field Services
Segment Reporting Information [Line Items]
Income (loss) from continuing operations	2,118	10,309
Kleen Performance Products
Segment Reporting Information [Line Items]
Income (loss) from continuing operations	4,560	(4,476)
SK Environmental Services
Segment Reporting Information [Line Items]
Income (loss) from continuing operations	35,495	27,249
Lodging Services
Segment Reporting Information [Line Items]
Income (loss) from continuing operations	1,019	6,910
Oil and Gas Field Services
Segment Reporting Information [Line Items]
Income (loss) from continuing operations	(1,394)	1,403
Corporate Items
Segment Reporting Information [Line Items]
Income (loss) from continuing operations	$ (34,876)	$ (26,519)

SEGMENT REPORTING (Assets by Re

SEGMENT REPORTING (Assets by Reportable Segment) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Property, plant and equipment, net	$ 1,596,872	$ 1,532,467
Goodwill	460,642	453,105
Permits and other intangible, net	502,532	506,818
Total assets	3,641,675	3,431,428
Technical Services
Segment Reporting Information [Line Items]
Property, plant and equipment, net	499,464	483,425
Goodwill	48,694	49,267
Permits and other intangible, net	73,632	73,601
Total assets	818,098	800,060
Industrial and Field Services
Segment Reporting Information [Line Items]
Property, plant and equipment, net	234,088	237,660
Goodwill	106,637	105,286
Permits and other intangible, net	14,215	14,649
Total assets	378,639	368,858
Kleen Performance Products
Segment Reporting Information [Line Items]
Property, plant and equipment, net	202,445	193,855
Goodwill	50,143	49,755
Permits and other intangible, net	139,725	140,410
Total assets	501,019	492,483
SK Environmental Services
Segment Reporting Information [Line Items]
Property, plant and equipment, net	306,462	264,539
Goodwill	220,854	216,589
Permits and other intangible, net	254,230	256,251
Total assets	858,544	805,488
Lodging Services
Segment Reporting Information [Line Items]
Property, plant and equipment, net	108,489	105,208
Goodwill	34,314	32,208
Permits and other intangible, net	7,004	7,045
Total assets	188,547	181,357
Oil and Gas Field Services
Segment Reporting Information [Line Items]
Property, plant and equipment, net	153,869	156,286
Goodwill	0	0
Permits and other intangible, net	13,726	14,862
Total assets	243,543	244,210
Corporate Items
Segment Reporting Information [Line Items]
Property, plant and equipment, net	92,055	91,494
Goodwill	0	0
Permits and other intangible, net	0	0
Total assets	$ 653,285	$ 538,972

SEGMENT REPORTING (Total Assets

SEGMENT REPORTING (Total Assets by Geographical Area) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Total assets	$ 3,641,675	$ 3,431,428
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total assets	2,783,892	2,575,746
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Total assets	853,112	851,949
Other foreign
Revenues from External Customers and Long-Lived Assets [Line Items]
Total assets	$ 4,671	$ 3,733

GUARANTOR AND NON-GUARANTOR S68

GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 14, 2016	Dec. 07, 2012
Guarantor and Non-Guarantor Subsidiaries Financial Information [Abstract]
Subsidiary or equity method investee, cumulative percentage ownership after all transactions	100.00%
Unsecured senior notes 2021 | Unsecured debt
Debt Instrument [Line Items]
Issuance of debt	$ 250,000,000	$ 250,000,000	$ 600,000,000

GUARANTOR AND NON-GUARANTOR S69

GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION (Condensed Consolidating Balance Sheets) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
ASSETS
Cash and cash equivalents	$ 355,345	$ 184,708	$ 233,739	$ 246,879
Intercompany receivables	0	0
Accounts receivable, net	458,301	496,004
Other current assets	249,975	240,484
Property, plant and equipment, net	1,596,872	1,532,467
Investments in subsidiaries	0	0
Intercompany debt receivable	0	0
Goodwill	460,642	453,105
Permits and other intangibles, net	502,532	506,818
Other long-term assets	18,008	17,842
Total assets	3,641,675	3,431,428
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities	465,510	517,120
Intercompany payables	0	0
Closure, post-closure and remedial liabilities, net	167,972	167,846
Long-term obligations	1,631,603	1,382,543
Intercompany debt payable	0	0
Other long-term liabilities	260,017	267,637
Total liabilities	2,525,102	2,335,146
Stockholders’ equity	1,116,573	1,096,282
Total liabilities and stockholders’ equity	3,641,675	3,431,428
Clean Harbors, Inc.
ASSETS
Cash and cash equivalents	56,028	11,017	84,881	1,006
Intercompany receivables	172,776	164,709
Accounts receivable, net	0	0
Other current assets	0	0
Property, plant and equipment, net	0	0
Investments in subsidiaries	2,832,086	2,547,307
Intercompany debt receivable	0	0
Goodwill	0	0
Permits and other intangibles, net	0	0
Other long-term assets	1,626	1,068
Total assets	3,062,516	2,724,101
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities	22,124	20,813
Intercompany payables	288,515	220,762
Closure, post-closure and remedial liabilities, net	0	0
Long-term obligations	1,631,603	1,382,543
Intercompany debt payable	3,701	3,701
Other long-term liabilities	0	0
Total liabilities	1,945,943	1,627,819
Stockholders’ equity	1,116,573	1,096,282
Total liabilities and stockholders’ equity	3,062,516	2,724,101
U.S. Guarantor Subsidiaries
ASSETS
Cash and cash equivalents	219,856	83,479	78,608	154,147
Intercompany receivables	283,034	213,243
Accounts receivable, net	380,873	404,580
Other current assets	185,171	179,969
Property, plant and equipment, net	1,129,262	1,082,466
Investments in subsidiaries	524,500	522,067
Intercompany debt receivable	278,018	260,957
Goodwill	369,400	367,306
Permits and other intangibles, net	429,388	435,080
Other long-term assets	9,457	10,274
Total assets	3,808,959	3,559,421
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities	382,100	424,588
Intercompany payables	203,542	195,287
Closure, post-closure and remedial liabilities, net	152,767	153,190
Long-term obligations	0	0
Intercompany debt payable	0	0
Other long-term liabilities	238,464	239,049
Total liabilities	976,873	1,012,114
Stockholders’ equity	2,832,086	2,547,307
Total liabilities and stockholders’ equity	3,808,959	3,559,421
Foreign Non-Guarantor Subsidiaries
ASSETS
Cash and cash equivalents	79,461	90,212	$ 70,250	$ 91,726
Intercompany receivables	38,065	39,804
Accounts receivable, net	77,428	91,424
Other current assets	64,804	60,515
Property, plant and equipment, net	467,610	450,001
Investments in subsidiaries	0	0
Intercompany debt receivable	3,701	3,701
Goodwill	91,242	85,799
Permits and other intangibles, net	73,144	71,738
Other long-term assets	6,925	6,500
Total assets	902,380	899,694
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities	61,286	71,719
Intercompany payables	1,818	1,707
Closure, post-closure and remedial liabilities, net	15,205	14,656
Long-term obligations	0	0
Intercompany debt payable	278,018	260,957
Other long-term liabilities	21,553	28,588
Total liabilities	377,880	377,627
Stockholders’ equity	524,500	522,067
Total liabilities and stockholders’ equity	902,380	899,694
Consolidating Adjustments
ASSETS
Cash and cash equivalents	0	0
Intercompany receivables	(493,875)	(417,756)
Accounts receivable, net	0	0
Other current assets	0	0
Property, plant and equipment, net	0	0
Investments in subsidiaries	(3,356,586)	(3,069,374)
Intercompany debt receivable	(281,719)	(264,658)
Goodwill	0	0
Permits and other intangibles, net	0	0
Other long-term assets	0	0
Total assets	(4,132,180)	(3,751,788)
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities	0	0
Intercompany payables	(493,875)	(417,756)
Closure, post-closure and remedial liabilities, net	0	0
Long-term obligations	0	0
Intercompany debt payable	(281,719)	(264,658)
Other long-term liabilities	0	0
Total liabilities	(775,594)	(682,414)
Stockholders’ equity	(3,356,586)	(3,069,374)
Total liabilities and stockholders’ equity	$ (4,132,180)	$ (3,751,788)

GUARANTOR AND NON-GUARANTOR S70

GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION (Condensed Consolidating Statements of (Loss) Income) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Revenues:
Service revenues	$ 530,231	$ 596,330
Product revenues	105,852	136,169
Total revenues	636,083	732,499
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	373,986	416,390
Product cost of revenues	90,293	130,117
Total cost of revenues	464,279	546,507
Selling, general and administrative expenses	104,484	107,715
Accretion of environmental liabilities	2,505	2,619
Depreciation and amortization	68,902	68,356
(Loss) income from operations	(4,087)	7,302
Other income (expense)	(350)	409
Interest (expense) income	(18,980)	(19,438)
Equity in earnings of subsidiaries, net of taxes	0	0
Intercompany interest income (expense)	0	0
(Loss) income before (benefit) provision for income taxes	(23,417)	(11,727)
(Benefit) provision for income taxes	(2,546)	(4,638)
Net (loss) income	(20,871)	(7,089)
Other comprehensive income (loss)	45,837	(77,403)
Comprehensive income (loss)	24,966	(84,492)
Clean Harbors, Inc.
Revenues:
Service revenues	0	0
Product revenues	0	0
Total revenues	0	0
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	0	0
Product cost of revenues	0	0
Total cost of revenues	0	0
Selling, general and administrative expenses	24	25
Accretion of environmental liabilities	0	0
Depreciation and amortization	0	0
(Loss) income from operations	(24)	(25)
Other income (expense)	0	0
Interest (expense) income	(20,143)	(19,639)
Equity in earnings of subsidiaries, net of taxes	(8,771)	4,709
Intercompany interest income (expense)	0	0
(Loss) income before (benefit) provision for income taxes	(28,938)	(14,955)
(Benefit) provision for income taxes	(8,067)	(7,866)
Net (loss) income	(20,871)	(7,089)
Other comprehensive income (loss)	45,837	(77,403)
Comprehensive income (loss)	24,966	(84,492)
U.S. Guarantor Subsidiaries
Revenues:
Service revenues	428,477	418,517
Product revenues	89,588	116,536
Total revenues	518,065	535,053
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	282,964	277,602
Product cost of revenues	79,354	115,286
Total cost of revenues	362,318	392,888
Selling, general and administrative expenses	80,655	80,984
Accretion of environmental liabilities	2,290	2,306
Depreciation and amortization	48,695	45,801
(Loss) income from operations	24,107	13,074
Other income (expense)	(88)	111
Interest (expense) income	1,111	178
Equity in earnings of subsidiaries, net of taxes	(26,495)	(7,029)
Intercompany interest income (expense)	5,159	5,977
(Loss) income before (benefit) provision for income taxes	3,794	12,311
(Benefit) provision for income taxes	12,565	7,602
Net (loss) income	(8,771)	4,709
Other comprehensive income (loss)	45,837	(77,403)
Comprehensive income (loss)	37,066	(72,694)
Foreign Non-Guarantor Subsidiaries
Revenues:
Service revenues	114,023	193,453
Product revenues	18,713	23,204
Total revenues	132,736	216,657
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	103,291	154,428
Product cost of revenues	13,388	18,402
Total cost of revenues	116,679	172,830
Selling, general and administrative expenses	23,805	26,706
Accretion of environmental liabilities	215	313
Depreciation and amortization	20,207	22,555
(Loss) income from operations	(28,170)	(5,747)
Other income (expense)	(262)	298
Interest (expense) income	52	23
Equity in earnings of subsidiaries, net of taxes	0	0
Intercompany interest income (expense)	(5,159)	(5,977)
(Loss) income before (benefit) provision for income taxes	(33,539)	(11,403)
(Benefit) provision for income taxes	(7,044)	(4,374)
Net (loss) income	(26,495)	(7,029)
Other comprehensive income (loss)	28,927	(50,635)
Comprehensive income (loss)	2,432	(57,664)
Consolidating Adjustments
Revenues:
Service revenues	(12,269)	(15,640)
Product revenues	(2,449)	(3,571)
Total revenues	(14,718)	(19,211)
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	(12,269)	(15,640)
Product cost of revenues	(2,449)	(3,571)
Total cost of revenues	(14,718)	(19,211)
Selling, general and administrative expenses	0	0
Accretion of environmental liabilities	0	0
Depreciation and amortization	0	0
(Loss) income from operations	0	0
Other income (expense)	0	0
Interest (expense) income	0	0
Equity in earnings of subsidiaries, net of taxes	35,266	2,320
Intercompany interest income (expense)	0	0
(Loss) income before (benefit) provision for income taxes	35,266	2,320
(Benefit) provision for income taxes	0	0
Net (loss) income	35,266	2,320
Other comprehensive income (loss)	(74,764)	128,038
Comprehensive income (loss)	$ (39,498)	$ 130,358

GUARANTOR AND NON-GUARANTOR S71

GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION (Condensed Consolidating Statements of Cash Flows) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Condensed consolidating statement of cash flows
Net cash (used in) from operating activities	$ 39,289	$ 84,777
Cash flows from (used in) investing activities:
Additions to property, plant and equipment	(75,781)	(52,949)
Proceeds from sales of fixed assets	1,273	760
Acquisitions, net of cash acquired	(34,993)	0
Costs to obtain or renew permits	(512)	(1,171)
Investment in subsidiaries	0
Intercompany	0	0
Net cash used in investing activities	(110,013)	(53,360)
Cash flows from (used in) financing activities:
Change in uncashed checks	(5,218)	(20,268)
Issuance of restricted shares, net of shares remitted	(1,425)	(1,154)
Repurchases of common stock	(4,998)	(15,379)
Deferred financing costs paid	(2,190)	0
Excess tax benefit of stock-based compensation	0	5
Payments of capital leases	0	(398)
Issuance of senior secured notes, including premium	250,625
Intercompany	0	0
Net cash from financing activities	236,794	(37,194)
Effect of exchange rate change on cash	4,567	(7,363)
Increase (decrease) in cash and cash equivalents	170,637	(13,140)
Cash and cash equivalents, beginning of period	184,708	246,879
Cash and cash equivalents, end of period	355,345	233,739
Consolidating Adjustments
Condensed consolidating statement of cash flows
Net cash (used in) from operating activities		0
Cash flows from (used in) investing activities:
Investment in subsidiaries	250,625
Intercompany	6,423	108,435
Net cash used in investing activities	257,048	108,435
Cash flows from (used in) financing activities:
Issuance of senior secured notes, including premium	(250,625)
Intercompany	(6,423)	(108,435)
Net cash from financing activities	(257,048)	(108,435)
Clean Harbors, Inc.
Condensed consolidating statement of cash flows
Net cash (used in) from operating activities	47,201	(8,032)
Cash flows from (used in) investing activities:
Additions to property, plant and equipment	0	0
Proceeds from sales of fixed assets	0	0
Acquisitions, net of cash acquired	0
Costs to obtain or renew permits	0	0
Investment in subsidiaries	(250,625)
Intercompany	0	0
Net cash used in investing activities	(250,625)	0
Cash flows from (used in) financing activities:
Change in uncashed checks	0	0
Issuance of restricted shares, net of shares remitted	(1,425)	(1,154)
Repurchases of common stock	(4,998)	(15,379)
Deferred financing costs paid	(2,190)
Excess tax benefit of stock-based compensation		5
Payments of capital leases		0
Issuance of senior secured notes, including premium	250,625
Intercompany	6,423	108,435
Net cash from financing activities	248,435	91,907
Effect of exchange rate change on cash	0	0
Increase (decrease) in cash and cash equivalents	45,011	83,875
Cash and cash equivalents, beginning of period	11,017	1,006
Cash and cash equivalents, end of period	56,028	84,881
U.S. Guarantor Subsidiaries
Condensed consolidating statement of cash flows
Net cash (used in) from operating activities	(3,361)	85,311
Cash flows from (used in) investing activities:
Additions to property, plant and equipment	(64,754)	(37,670)
Proceeds from sales of fixed assets	277	113
Acquisitions, net of cash acquired	(34,993)
Costs to obtain or renew permits	(465)	0
Investment in subsidiaries	0
Intercompany	(6,423)	(108,435)
Net cash used in investing activities	(106,358)	(145,992)
Cash flows from (used in) financing activities:
Change in uncashed checks	(4,529)	(14,694)
Issuance of restricted shares, net of shares remitted	0	0
Repurchases of common stock	0	0
Deferred financing costs paid	0
Excess tax benefit of stock-based compensation		0
Payments of capital leases		(164)
Issuance of senior secured notes, including premium	250,625
Intercompany	0	0
Net cash from financing activities	246,096	(14,858)
Effect of exchange rate change on cash	0	0
Increase (decrease) in cash and cash equivalents	136,377	(75,539)
Cash and cash equivalents, beginning of period	83,479	154,147
Cash and cash equivalents, end of period	219,856	78,608
Foreign Non-Guarantor Subsidiaries
Condensed consolidating statement of cash flows
Net cash (used in) from operating activities	(4,551)	7,498
Cash flows from (used in) investing activities:
Additions to property, plant and equipment	(11,027)	(15,279)
Proceeds from sales of fixed assets	996	647
Acquisitions, net of cash acquired	0
Costs to obtain or renew permits	(47)	(1,171)
Investment in subsidiaries	0
Intercompany	0	0
Net cash used in investing activities	(10,078)	(15,803)
Cash flows from (used in) financing activities:
Change in uncashed checks	(689)	(5,574)
Issuance of restricted shares, net of shares remitted	0	0
Repurchases of common stock	0	0
Deferred financing costs paid	0
Excess tax benefit of stock-based compensation		0
Payments of capital leases		(234)
Issuance of senior secured notes, including premium	0
Intercompany	0	0
Net cash from financing activities	(689)	(5,808)
Effect of exchange rate change on cash	4,567	(7,363)
Increase (decrease) in cash and cash equivalents	(10,751)	(21,476)
Cash and cash equivalents, beginning of period	90,212	91,726
Cash and cash equivalents, end of period	$ 79,461	$ 70,250

SUBSEQUENT EVENTS Narrative (De

SUBSEQUENT EVENTS Narrative (Details)	Apr. 30, 2016plant
Blending and Packaging Plants | Subsequent Event
Subsequent Event [Line Items]
Number of plants acquired	2