Clean Harbors (CLH) 10-Q 2 Nov 16 2016 Q3 Quarterly report Financial data

DOCUMENT AND ENTITY INFORMATION

DOCUMENT AND ENTITY INFORMATION - shares	9 Months Ended
	Sep. 30, 2016	Oct. 31, 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	Sep. 30, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Common Stock, Shares Outstanding		57,392,673

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 257,857	$ 184,708
Accounts receivable, net of allowances aggregating $28,782 and $31,426, respectively	512,376	496,004
Unbilled accounts receivable	41,542	25,940
Deferred costs	19,970	18,758
Inventories and supplies	177,288	149,521
Prepaid expenses and other current assets	40,898	46,265
Total current assets	1,049,931	921,196
Property, plant and equipment, net	1,648,571	1,532,467
Other assets:
Deferred financing costs	1,197	1,847
Goodwill	470,633	453,105
Permits and other intangibles, net	507,337	506,818
Other	34,944	15,995
Total other assets	1,014,111	977,765
Total assets	3,712,613	3,431,428
Current liabilities:
Accounts payable	226,776	241,183
Deferred revenue	66,023	61,882
Accrued expenses	226,080	193,660
Current portion of closure, post-closure and remedial liabilities	20,217	20,395
Total current liabilities	539,096	517,120
Other liabilities:
Closure and post-closure liabilities, less current portion of $6,057 and $7,229, respectively	56,510	49,020
Remedial liabilities, less current portion of $14,160 and $13,166, respectively	114,921	118,826
Long-term obligations	1,632,577	1,382,543
Deferred taxes, unrecognized tax benefits and other long-term liabilities	268,564	267,637
Total other liabilities	2,072,572	1,818,026
Commitments and contingent liabilities
Stockholders’ equity:
Common Stock, $.01 par value: Authorized 80,000,000; shares issued and outstanding 57,389,531 and 57,593,201 shares, respectively	574	576
Shares held under employee participation plan	(469)	(469)
Additional paid-in capital	726,878	738,401
Accumulated other comprehensive loss	(211,544)	(254,892)
Accumulated earnings	585,506	612,666
Total stockholders’ equity	1,100,945	1,096,282
Total liabilities and stockholders’ equity	$ 3,712,613	$ 3,431,428

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Account receivable, allowances aggregating	$ 28,782	$ 31,426
Closure and post-closure liabilities, current portion	6,057	7,229
Remedial liabilities, current portion	$ 14,160	$ 13,166
Common stock, par value (in USD per share)	$ 0.01	$ 0.01
Common stock, authorized shares (in shares)	80,000,000	80,000,000
Common stock, issued shares (in shares)	57,389,531	57,593,201
Common stock, outstanding shares (in shares)	57,389,531	57,593,201

UNAUDITED CONSOLIDATED STATEMEN

UNAUDITED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Revenues:
Service revenues	$ 594,225	$ 760,667	$ 1,709,018	$ 2,158,344
Product revenues	135,295	132,699	354,095	403,749
Total revenues	729,520	893,366	2,063,113	2,562,093
Cost of revenues (exclusive of items shown separately below)
Service revenues	385,542	523,676	1,148,212	1,484,936
Product revenues	106,373	110,970	287,984	348,905
Total cost of revenues	491,915	634,646	1,436,196	1,833,841
Selling, general and administrative expenses	110,954	93,113	322,501	321,246
Accretion of environmental liabilities	2,476	2,577	7,529	7,795
Depreciation and amortization	73,360	69,060	215,655	205,189
Goodwill impairment charge	34,013	0	34,013	31,992
Income (loss) from operations	16,802	93,970	47,219	162,030
Other expense	(198)	(139)	(737)	(390)
Gain on sale of business	16,431	0	16,431	0
Interest expense, net of interest income of $196, $126, $571 and $465, respectively	(21,565)	(19,017)	(62,192)	(57,704)
(Loss) income before (benefit) provision for income taxes	11,470	74,814	721	103,936
Provision for income taxes	21,725	34,586	27,881	60,402
Net (loss) income	$ (10,255)	$ 40,228	$ (27,160)	$ 43,534
(Loss) earnings per share:
Basic (in USD per share)	$ (0.18)	$ 0.69	$ (0.47)	$ 0.74
Diluted (in USD per share)	$ (0.18)	$ 0.69	$ (0.47)	$ 0.74
Shares used to compute (loss) earnings per share - Basic (in shares)	57,487	58,161	57,575	58,799
Shares used to compute (loss) earnings per share - Diluted (in shares)	57,487	58,268	57,575	58,898

UNAUDITED CONSOLIDATED STATEME5

UNAUDITED CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Statement [Abstract]
Interest expense	$ 196	$ 126	$ 571	$ 465

UNAUDITED CONSOLIDATED STATEME6

UNAUDITED CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (10,255)	$ 40,228	$ (27,160)	$ 43,534
Other comprehensive (loss) income:
Unrealized losses on available-for-sale securities (net of taxes of $238, $0, $238 and $0, respectively)	(164)	0	(358)	0
Foreign currency translation adjustments	(1,147)	(53,541)	43,706	(118,713)
Other comprehensive (loss) income	(1,311)	(53,541)	43,348	(118,713)
Comprehensive (loss) income	$ (11,566)	$ (13,313)	$ 16,188	$ (75,179)

UNAUDITED CONSOLIDATED STATEME7

UNAUDITED CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Unrealized gains (losses) on available-for-sale securities, taxes	$ 238	$ 0	$ 238	$ 0

UNAUDITED CONSOLIDATED STATEME8

UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash flows from operating activities:
Net (loss) income	$ (27,160)	$ 43,534
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	215,655	205,189
Goodwill impairment charge	34,013	31,992
Allowance for doubtful accounts	6,203	5,631
Amortization of deferred financing costs and debt discount	2,685	2,459
Accretion of environmental liabilities	7,529	7,795
Changes in environmental liability estimates	(349)	(2,200)
Deferred income taxes	(28,826)	(18,994)
Stock-based compensation	7,735	6,550
Excess tax benefit of stock-based compensation	(21)	(102)
Net tax deficiency on stock based awards	(642)	(78)
Other expense	1,247	390
Gain on sale of business	(16,431)	0
Environmental expenditures	(9,374)	(16,773)
Changes in assets and liabilities, net of acquisitions
Accounts receivable and unbilled accounts receivable	(32,944)	(63,222)
Inventories and supplies	(13,722)	14,708
Other current assets	5,619	18,706
Accounts payable	(11,951)	47,051
Other current and long-term liabilities	39,561	26,957
Net cash from operating activities	178,827	309,593
Cash flows used in investing activities:
Additions to property, plant and equipment	(175,348)	(189,999)
Proceeds from sales of fixed assets	3,982	3,740
Acquisitions, net of cash acquired	(207,089)	(79,610)
Proceeds on sale of business, net of cash	47,134	0
Additions to intangible assets, including costs to obtain or renew permits	(1,920)	(4,633)
Purchases of available-for-sale securities	(598)	0
Net cash used in investing activities	(333,839)	(270,502)
Cash flows from (used in) financing activities:
Change in uncashed checks	(7,084)	(21,882)
Proceeds from exercise of stock options	230	397
Issuance of restricted shares, net of shares remitted	(2,500)	(2,027)
Repurchases of common stock	(15,869)	(69,155)
Deferred financing costs paid	(2,614)	0
Payments on capital leases	0	(500)
Excess tax benefit of stock-based compensation	21	102
Issuance of senior secured notes, including premium	250,625	0
Net cash from (used in) financing activities	222,809	(93,065)
Effect of exchange rate change on cash	5,352	(13,714)
Increase (decrease) in cash and cash equivalents	73,149	(67,688)
Cash and cash equivalents, beginning of period	184,708	246,879
Cash and cash equivalents, end of period	257,857	179,191
Cash payments for interest and income taxes:
Interest paid	66,261	58,613
Income taxes paid	27,196	32,276
Non-cash investing and financing activities:
Accrual for repurchased shares	479	658
Property, plant and equipment accrued	18,181	29,549
Receivable for estimated purchase price adjustment	$ 1,910	$ 2,518

UNAUDITED CONSOLIDATED STATEME9

UNAUDITED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - 9 months ended Sep. 30, 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) income	(27,160)					(27,160)
Other comprehensive income	43,348				43,348
Stock-based compensation	7,735			7,735
Issuance of restricted shares, net of shares remitted	(2,500)	$ 1		(2,501)
Issuance of restricted shares, net of shares remitted (in shares)		124
Repurchases of common stock	$ (16,348)	$ (3)		(16,345)
Repurchases of common stock (in shares)	(300)	(337)
Exercise of stock options	$ 230			230
Exercise of stock options (in shares)		10
Net tax deficiency on stock based awards	(642)			(642)
Balance at end of period at Sep. 30, 2016	$ 1,100,945	$ 574	$ (469)	$ 726,878	$ (211,544)	$ 585,506
Balance ending of period (in shares) at Sep. 30, 2016		57,390

UNAUDITED CONSOLIDATED STATEM10

UNAUDITED CONSOLIDATED STATEMENTS OF STOCKHOLDERS'S EQUITY (PARENTHETICAL) - $ / shares	Sep. 30, 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	9 Months Ended
	Sep. 30, 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	9 Months Ended
	Sep. 30, 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. ASU 2015-16 is applied prospectively to adjustments to provisional amounts that occur after the effective date of this update. The adoption of ASU 2015-16 as of January 1, 2016 did not have a material 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. ASU 2016-02 should be applied using a modified retrospective approach and early adoption is permitted. 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. ASU 2016-09 allows for retrospective or prospective application and early adoption is permitted. 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) . In May 2016, FASB issued ASU 2016-12, Revenue from Contracts with Customers (Topic 606) . ASU 2016-12 provided narrow scope improvements and practical expedients on assessing collectability, presentation of sales taxes, noncash consideration, and completed contracts and contract modifications at transition. 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 August 2016, FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments (a consensus of the Emerging Issues Task Force) . The amendment provides updated guidance on eight specific cash flow issues, including debt prepayment or debt extinguishment costs, settlement of zero-coupon debt instruments, contingent consideration payments made after a business combination, proceeds from settlement of insurance claims and corporate-owned life insurance, distributions received from equity method investees, beneficial interests in securitization transactions and separately identifiable cash flows and application of the predominance principle. Early adoption is permitted. The amendments in this update are effective for annual reporting periods (including interim reporting periods within those periods) beginning after December 15, 2017.

BUSINESS COMBINATIONS

BUSINESS COMBINATIONS	9 Months Ended
	Sep. 30, 2016
Business Combinations [Abstract]
BUSINESS COMBINATIONS	BUSINESS COMBINATIONS 2016 Acquisitions During the first nine months of 2016 , the Company acquired seven businesses that will primarily complement the strategy to create a direct sales model as it relates to the sale of the Company's oil products. These acquisitions provided the Company two additional oil re-refineries while also expanding its used motor oil collection network and providing greater blending and packaging capabilities. These acquisitions provide the Company with greater access to customers in the West Coast region of the United States and additional locations with Part B permits. Operations of these acquisitions are primarily being integrated across the SK Environmental Services and Kleen Performance Products segments with certain operations also being integrated into the Technical Services and Industrial and Field Services segments. The combined purchase price for the seven acquisitions was approximately $205.2 million paid in cash and subject to customary post-closing adjustments. The combined amount of direct revenue from the acquisitions included in the Company's results of operations for each of the three and nine months ended September 30, 2016 was approximately $26.0 million and $38.1 million , respectively. During the three and nine months ended September 30, 2016 , the Company incurred acquisition-related costs of approximately $0.7 million and $1.2 million , respectively, in connection with the transactions which are included in selling, general and administrative expenses in the consolidated statements of operations. The allocation of the purchase price was based on preliminary estimates of the fair value of assets acquired and liabilities assumed as of the acquisition dates. Given the recent timing of these transactions, the Company is continuing to obtain information to complete its valuation of these accounts and the associated tax accounting. The components and preliminary allocation of the purchase price consist of the following amounts (in thousands): At Acquisition Dates Measurement Period Adjustments At Acquisition Dates As Reported Accounts receivable $ 17,384 $ (1,016 ) $ 16,368 Inventories and supplies 13,859 (1,071 ) 12,788 Prepaid expenses and other current assets 920 9 929 Property, plant and equipment 132,705 (1,843 ) 130,862 Permits and other intangibles 23,405 3,651 27,056 Deferred tax assets 855 (2 ) 853 Current liabilities (19,486 ) (438 ) (19,924 ) Closure and post-closure liabilities (1,709 ) (699 ) (2,408 ) Deferred taxes, unrecognized tax benefits and other long-term liabilities (9,518 ) (1,894 ) (11,412 ) Total identifiable net assets 158,415 (3,303 ) 155,112 Goodwill 48,674 1,393 50,067 Total purchase price, net of cash acquired $ 207,089 $ (1,910 ) $ 205,179 Pro forma revenue and earnings amounts on a combined basis as if these acquisitions had been completed on January 1, 2015 are immaterial to the consolidated financial statements of the Company since that date. 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. 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 finalized the purchase accounting for the acquisition of TFI in the second quarter of 2016. The following table summarizes the recognized amounts of assets acquired and liabilities assumed at April 11, 2015 (in thousands): Preliminary Allocations Measurement Period Adjustments Final Allocations 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 purchase price, net of cash acquired $ 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 assets have been integrated into the SK Environmental Services segment. In connection with this acquisition a preliminary goodwill amount of $ 7.4 million was recognized.

DISPOSITION OF BUSINESS

DISPOSITION OF BUSINESS	9 Months Ended
	Sep. 30, 2016
Discontinued Operations and Disposal Groups [Abstract]
DISPOSITION OF BUSINESS	DISPOSITION OF BUSINESS On September 1, 2016, the Company completed the sale of its Catalyst Services business, which was a non-core business previously included within the Industrial and Field Services segment, for approximately $ 50.1 million ( $48.6 million net of cash divested) subject to customary post-closing conditions. As a result of the sale, the Company recognized during the three and nine months ended September 30, 2016 a pre-tax gain of $ 16.4 million which is included in gain on sale of business in the Company’s consolidated statement of operations. Inclusive within this gain was $1.5 million of transactional related costs. The following table presents the carrying amounts of the Company's Catalyst Services business immediately preceding the disposition on September 1, 2016, in thousands: September 1, 2016 Total current assets $ 19,135 Property, plant and equipment, net 11,126 Total other assets 6,500 Total assets divested $ 36,761 Total current liabilities 4,040 Total other liabilities 566 Total liabilities divested $ 4,606 Net carrying value divested $ 32,155 The Company evaluated the disposition and determined it did not meet the “major effect” criteria for classification as a discontinued operation largely due to the nature and size of the operations of the disposed of entity. However, the Company determined that the disposition does represent an individually significant component of the Company's business. The following table presents (loss) income attributable to the Catalyst Services business included in the Company's consolidated results of operations for each of the periods shown and through its disposition on September 30, 2016, in thousands: Three Months Ended Nine Months Ended September 30, September 30, 2016 2015 2016 2015 (Loss) income before provision for income taxes (1,218 ) 1,089 290 2,489

INVENTORIES AND SUPPLIES

INVENTORIES AND SUPPLIES	9 Months Ended
	Sep. 30, 2016
Inventory Disclosure [Abstract]
INVENTORIES AND SUPPLIES	INVENTORIES AND SUPPLIES Inventories and supplies consisted of the following (in thousands): September 30, 2016 December 31, 2015 Oil and oil products $ 57,403 $ 33,603 Supplies and drums 84,133 78,132 Solvent and solutions 8,502 8,868 Modular camp accommodations 15,492 15,126 Other 11,758 13,792 Total inventories and supplies $ 177,288 $ 149,521 The increase in oil and oil products as of September 30, 2016 as compared to December 31, 2015 was a result of the Company's recent acquisitions and implementation of its closed loop direct sales model. As of September 30, 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	9 Months Ended
	Sep. 30, 2016
Property, Plant and Equipment [Abstract]
PROPERTY, PLANT AND EQUIPMENT	PROPERTY, PLANT AND EQUIPMENT Property, plant and equipment consisted of the following (in thousands): September 30, 2016 December 31, 2015 Land $ 122,337 $ 100,582 Asset retirement costs (non-landfill) 14,590 12,434 Landfill assets 142,587 136,624 Buildings and improvements 379,435 344,209 Camp equipment 156,838 149,361 Vehicles 535,804 500,619 Equipment 1,465,378 1,328,915 Furniture and fixtures 5,546 5,337 Construction in progress 147,569 113,657 2,970,084 2,691,738 Less - accumulated depreciation and amortization 1,321,513 1,159,271 Total property, plant and equipment, net $ 1,648,571 $ 1,532,467 Interest in the amount of $1.5 million and $4.0 million was capitalized to fixed assets during the three and nine months ended September 30, 2016 , respectively. Interest in the amount of $0.6 million and $1.2 million was capitalized to fixed assets during the three and nine months ended September 30, 2015 , respectively. Depreciation expense, inclusive of landfill amortization, was $62.6 million and $185.4 million for the three and nine months ended September 30, 2016 , respectively. Depreciation expense, inclusive of landfill amortization, was $59.2 million and $175.5 million for the three and nine months ended September 30, 2015 , respectively.

GOODWILL AND OTHER INTANGIBLE A

GOODWILL AND OTHER INTANGIBLE ASSETS	9 Months Ended
	Sep. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
GOODWILL AND OTHER INTANGIBLE ASSETS	GOODWILL AND OTHER INTANGIBLE ASSETS The changes in goodwill for the nine months ended September 30, 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 Acquired from current period acquisitions 8,989 4,925 18,629 17,524 — — 50,067 Measurement period adjustment from prior period acquisitions — — — 2,095 — — 2,095 Decrease from disposition of business — (4,994 ) — (4,994 ) Goodwill impairment charge (34,013 ) (34,013 ) Foreign currency translation and other (619 ) 1,132 98 1,957 1,805 — 4,373 Balance at September 30, 2016 $ 57,637 $ 106,349 $ 68,482 $ 238,165 $ — $ — $ 470,633 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. As disclosed in the Company’s quarterly report on Form 10-Q for the period ended June 30, 2016, the Company noted that its Lodging reporting unit has been negatively impacted by persistently weak oil and gas prices that have negatively impacted the Western Canadian energy market and that if these economic difficulties persisted, future impairments might be required. During the first and second quarters of 2016, the Company evaluated the reporting unit’s performance along with other business specific and macroeconomic factors and concluded that no interim impairment test was necessary. During the quarter ended September 30, 2016 certain events and changes in circumstances arose which led management to conclude that the fair value of the Lodging reporting unit was more likely than not less than its carrying value, and therefore an interim goodwill impairment test was performed. The primary events and changes in circumstances which led to this conclusion were: • Macroeconomic conditions for service companies operating in western Canada’s oil sands region deteriorated in 2016 primarily due to persistently low oil and gas prices. Persistently low prices have caused Lodging’s primary customers to significantly reduce, defer, or cancel oil and gas projects that are in, or had been planned for, this region during periods of more robust commodity pricing. • Government regulatory delays related to oil and gas pipeline projects have reduced management’s confidence that these projects will move forward in a timely manner or in the form that had been originally contemplated by their planners. These projects represented a significant portion of Lodging’s future growth in terms of the demand for temporary accommodations provided by the Lodging reporting unit. While some of these projects have made recent advancements towards successful government approval, the lack of meaningful progress to date does not provide enough positive evidence that a recovery will be significant enough to improve Lodging’s current forecasted outlook. • There have been consecutive historical quarters where business results were significantly less than internal forecasts, and previous actual results, for the Lodging reporting unit. • During the third quarter ended September 30, 2016, management’s near term outlook was clarified in regards to the business’ projections and the impacts of large scale forest fires which took place in the Fort McMurray area of Alberta, Canada where the Company has significant Lodging operations. • Due to the factors listed above, management significantly lowered its 2016 forecasts and long-range performance relative to the Lodging reporting unit. In performing Step I of the interim goodwill impairment test, the estimated fair value of the Lodging reporting unit was determined using an income approach with discounted cash flows which were compared to the reporting unit’s carrying value as of September 30, 2016 . Based on the results of that evaluation, the carrying amount of the reporting unit, including $ 34.0 million of goodwill, exceeded Lodging’s estimated fair value and as a result the Company performed Step II of the goodwill impairment test to determine the amount of goodwill impairment that would need to be recognized. Step II of the goodwill impairment test required the Company to perform a theoretical purchase price allocation for Lodging to determine the implied fair value of its goodwill and then compare that implied fair value to its recorded amount. Estimates and assumptions were used to determine the fair values for Lodging’s long-lived assets in Step II and these involved the use of significant professional judgment on the part of management. The classes of assets that were affected by these estimates and assumptions related most significantly to property, plant, and equipment, goodwill, and intangible assets. Based on the results of this test the implied fair value of goodwill was determined to be $ 0 . Accordingly, the Company recognized a goodwill impairment charge equal to its recorded amount, or $ 34.0 million , as of September 30, 2016 . The factors contributing to the $ 34.0 million goodwill impairment charge principally related to events and changes in circumstances discussed above which negatively impacted the Company’s prospective financial information in its discounted cash flow model and the reporting unit's estimated fair value. Lower levels of pricing and an unfavorable change in product mix that reduced expected profit became evident during the third quarter ended September 30, 2016 as management updated the Company's long term projections for the business and as a result decreased the reporting unit’s anticipated future cash flows as compared to those estimated previously. These factors also provided evidence of a longer than expected recovery from current industry lows, which negatively impacted the estimated levels of cash flows in future periods that are assumed in the cash flow model. These factors adversely affected the estimated fair value of the reporting unit and ultimately led to the recognition of the goodwill impairment charge. As a result of the sale of the Catalyst Services business discussed in Note 4, "Disposition of Business" to the accompanying financial statements, a step 1 goodwill impairment test was also performed relative to the remaining goodwill of $25.1 million in the Industrial Services reporting unit. The results of this test indicated that no impairment of the goodwill exists as of September 30, 2016. Significant judgments and unobservable inputs categorized as Level III in the fair value hierarchy are inherent in the impairment tests performed and include assumptions about the amount and timing of expected future cash flows, growth rates, and the determination of appropriate discount rates. The Company believes that the assumptions used in its annual and any interim date impairment tests are reasonable, but variations in any of the assumptions may result in different calculations of fair values and impairment charges. The Company also performed an analysis to determine whether the carrying values of the Lodging segment's finite-lived intangible and other long lived assets may not be entirely recoverable. As of September 30, 2016 , the Lodging reporting unit had property, plant and equipment of $ 99.8 million and other intangible assets of $ 6.0 million . Based on the analysis performed, sufficient future cash flows are anticipated over those assets' remaining lives to demonstrate recoverability. Thus no impairment charge was recorded related to those other long lived assets . As of September 30, 2016 and December 31, 2015 , the Company's total finite-lived and indefinite-lived intangible assets consisted of the following (in thousands): September 30, 2016 December 31, 2015 Cost Accumulated Net Weighted Cost Accumulated Net Weighted Permits $ 170,194 $ 66,510 $ 103,684 20.3 $ 161,396 $ 61,142 $ 100,254 19.0 Customer and supplier relationships 389,002 120,922 268,080 12.5 374,866 99,463 275,403 10.1 Other intangible assets 40,266 27,548 12,718 7.8 31,416 22,581 8,835 1.5 Total amortizable permits and other intangible assets 599,462 214,980 384,482 14.4 567,678 183,186 384,492 10.0 Trademarks and trade names 122,855 — 122,855 Indefinite 122,326 — 122,326 Indefinite Total permits and other intangible assets $ 722,317 $ 214,980 $ 507,337 $ 690,004 $ 183,186 $ 506,818 Amortization expense of permits and other intangible assets was $10.8 million and $30.3 million for the three and nine months ended September 30, 2016 , respectively. Amortization expense of permits and other intangible assets was $9.9 million and $29.7 million for the three and nine months ended September 30, 2015 , respectively. The expected amortization of the net carrying amount of finite-lived intangible assets at September 30, 2016 was as follows (in thousands): Years Ending December 31, Expected Amortization 2016 (three months) $ 9,533 2017 35,325 2018 32,345 2019 29,612 2020 27,316 Thereafter 250,351 $ 384,482

ACCRUED EXPENSES

ACCRUED EXPENSES	9 Months Ended
	Sep. 30, 2016
Payables and Accruals [Abstract]
ACCRUED EXPENSES	ACCRUED EXPENSES Accrued expenses consisted of the following at September 30, 2016 and December 31, 2015 (in thousands): September 30, 2016 December 31, 2015 Insurance $ 59,254 $ 55,899 Interest 21,859 20,500 Accrued compensation and benefits 46,921 35,646 Income, real estate, sales and other taxes 60,020 37,095 Other 38,026 44,520 $ 226,080 $ 193,660

CLOSURE AND POST-CLOSURE LIABIL

CLOSURE AND POST-CLOSURE LIABILITIES	9 Months Ended
	Sep. 30, 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 September 30, 2016 were as follows (in thousands): Landfill Non-Landfill Total Balance at January 1, 2016 $ 32,023 $ 24,226 $ 56,249 Liabilities assumed in acquisitions — 2,408 2,408 Adjustments during the measurement period related to 2015 acquisitions — 657 657 New asset retirement obligations 1,650 — 1,650 Accretion 1,996 1,748 3,744 Changes in estimates recorded to statement of operations (597 ) (114 ) (711 ) Expenditures (904 ) (709 ) (1,613 ) Currency translation and other 130 53 183 Balance at September 30, 2016 $ 34,298 $ 28,269 $ 62,567 All of the landfill facilities included in the above were active as of September 30, 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 nine months of 2016 were discounted at the credit-adjusted risk-free rate of 6.23% .

REMEDIAL LIABILITIES

REMEDIAL LIABILITIES	9 Months Ended
	Sep. 30, 2016
Environmental Remediation Obligations [Abstract]
REMEDIAL LIABILITIES	REMEDIAL LIABILITIES The changes to remedial liabilities for the nine months ended September 30, 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 Liabilities assumed in acquisition — — 4 4 Accretion 82 2,049 1,654 3,785 Changes in estimates recorded to statement of operations 71 (448 ) 739 362 Expenditures (88 ) (2,957 ) (4,716 ) (7,761 ) Currency translation and other — 45 654 699 Balance at September 30, 2016 $ 2,392 $ 62,302 $ 64,387 $ 129,081 In the nine months ended September 30, 2016 , there were no significant charges (benefits) resulting from changes in estimates for remedial liabilities.

FINANCING ARRANGEMENTS

FINANCING ARRANGEMENTS	9 Months Ended
	Sep. 30, 2016
Debt Disclosure [Abstract]
FINANCING ARRANGEMENTS	FINANCING ARRANGEMENTS The following table is a summary of the Company’s financing arrangements (in thousands): September 30, 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 (12,423 ) (12,457 ) Long-term obligations, at carrying value $ 1,632,577 $ 1,382,543 At September 30, 2016 and December 31, 2015 , the fair value of the Company's 2020 Notes was $824.0 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 $ 250.0 million aggregate principal amount as additional notes under the indenture pursuant to which the Company previously issued on December 7, 2012 $ 600.0 million aggregate principal amount of 2021 Notes. Interest payments are paid semi-annually on June 1 and December 1 of each year. At September 30, 2016 and December 31, 2015 , the fair value of the Company's 2021 Notes was $866.1 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 September 30, 2016 and December 31, 2015 , had no outstanding loan balances. At September 30, 2016 , $201.4 million was available to borrow and outstanding letters of credit were $142.0 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 ("Parent's") domestic subsidiaries and secured by substantially all of the Parent’s and its domestic subsidiaries’ assets. Available credit for Parent and its domestic subsidiaries is generally 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 generally 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. On November 1, 2016, the Company entered into an amended and restated credit agreement for its revolving credit facility. Under the amended and restated agreement, the terms are substantially the same as under the prior agreement, but the facility termination date has been extended, subject to certain conditions, until November 1, 2021.

(LOSS) EARNINGS PER SHARE

(LOSS) EARNINGS PER SHARE	9 Months Ended
	Sep. 30, 2016
Earnings Per Share [Abstract]
(LOSS) EARNINGS PER SHARE	(LOSS) EARNINGS PER SHARE The following are computations of basic and diluted (loss) earnings per share (in thousands except for per share amounts): Three Months Ended Nine Months Ended September 30, September 30, 2016 2015 2016 2015 Numerator for basic and diluted (loss) earnings per share: Net (loss) income $ (10,255 ) $ 40,228 $ (27,160 ) $ 43,534 Denominator: Basic shares outstanding 57,487 58,161 57,575 58,799 Dilutive effect of equity-based compensation awards — 107 — 99 Dilutive shares outstanding 57,487 58,268 57,575 58,898 Basic (loss) earnings per share: $ (0.18 ) $ 0.69 $ (0.47 ) $ 0.74 Diluted (loss) earnings per share: $ (0.18 ) $ 0.69 $ (0.47 ) $ 0.74 As a result of the net loss reported for the three and nine months ended September 30, 2016 , all then outstanding stock options, restricted stock awards and performance awards totaling 835,482 were excluded from the calculation of diluted (loss) earnings per share as their inclusion would have an antidilutive effect. For the three and nine months ended September 30, 2015 , the dilutive effect of all then outstanding options, restricted stock and performance awards is included in the EPS calculations above except for 274,257 of outstanding performance stock awards for which the performance criteria were not attained at that time and 10,704 and 42,642 , respectively, of restricted stock awards which were antidilutive at that time.

ACCUMULATED OTHER COMPREHENSIVE

ACCUMULATED OTHER COMPREHENSIVE LOSS	9 Months Ended
	Sep. 30, 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 nine months ended September 30, 2016 were as follows (in thousands): Foreign Currency Translation Unrealized Gains on Available-For-Sale Securities Unfunded Pension Liability Total Balance at January 1, 2016 $ (252,939 ) $ — $ (1,953 ) $ (254,892 ) Other comprehensive income (loss) before reclassifications 43,706 (596 ) — 43,110 Tax effects — 238 — 238 Other comprehensive income (loss) $ 43,706 $ (358 ) $ — $ 43,348 Balance at September 30, 2016 $ (209,233 ) $ (358 ) $ (1,953 ) $ (211,544 ) There were no reclassifications out of accumulated other comprehensive loss during the three and nine months ended September 30, 2016 and 2015 .

STOCK-BASED COMPENSATION

STOCK-BASED COMPENSATION	9 Months Ended
	Sep. 30, 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 and nine months ended September 30, 2016 was $3.0 million and $7.7 million , respectively. Total stock-based compensation cost charged to selling, general and administrative expenses for the three and nine months ended September 30, 2015 was $0.5 million and $6.6 million , respectively. During the three months ended September 30, 2015 , the Company reversed $1.4 million of stock based compensation for performance stock awards originally issued in 2014 as management determined it was no longer probable that a portion of the performance targets would be earned. The total income tax benefit recognized in the consolidated statements of operations from stock-based compensation was $0.9 million and $2.3 million for the three and nine months ended September 30, 2016 , respectively. The total income tax benefit recognized in the consolidated statements of operations from stock-based compensation was $0.1 million and $1.8 million for the three and nine months ended September 30, 2015 , respectively. 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 nine months ended September 30, 2016 : Restricted Stock Number of Shares Weighted Average Grant-Date Fair Value Balance at January 1, 2016 362,618 $ 55.79 Granted 335,992 $ 50.87 Vested (168,565 ) $ 54.06 Forfeited (46,298 ) $ 53.04 Balance at September 30, 2016 483,747 $ 53.23 As of September 30, 2016 , there was $17.2 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 3.0 years. The total fair value of restricted stock vested during the three and nine months ended September 30, 2016 was $1.8 million and $7.9 million , respectively. The total fair value of restricted stock vested during the three and nine months ended September 30, 2015 was $0.6 million and $6.8 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 nine months ended September 30, 2016 : Performance Stock Number of Shares Weighted Average Grant-Date Fair Value Balance at January 1, 2016 187,274 $ 57.13 Granted 207,624 $ 54.21 Vested (8,420 ) $ 61.90 Forfeited (33,469 ) $ 55.96 Balance at September 30, 2016 353,009 $ 55.39 As of September 30, 2016 , there was $0.2 million of total unrecognized compensation cost arising from unvested performance stock awards deemed probable of vesting under the Company's Plans. No performance awards vested during the three months ended September 30, 2016 . The total fair value of performance awards vested during the nine months ended September 30, 2016 was $0.4 million . The total fair value of performance awards vested during the nine months ended September 30, 2015 was $0.3 million . No performance awards vested during the three months ended September 30, 2015 . 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 and nine months ended September 30, 2016 , the Company repurchased and retired a total of 0.1 million shares and 0.3 million shares, respectively, of the Company's common stock for a total cost of $6.2 million and $16.3 million , respectively. During the three and nine months ended September 30, 2015 , the Company repurchased and retired a total of 0.8 million shares and 1.3 million shares, respectively, of the Company's common stock for a total cost of $37.6 million and $69.8 million , respectively. Through September 30, 2016 , the Company has repurchased and retired a total of 3.7 million shares of the Company's common stock for a total cost of $194.0 million under this program. As of September 30, 2016 , an additional $106.0 million remains available for repurchase of shares under the current authorized program.

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	9 Months Ended
	Sep. 30, 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 September 30, 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 September 30, 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 September 30, 2016 and December 31, 2015 , the $20.9 million and $21.9 million , respectively, of reserves consisted of (i) $18.3 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) $2.6 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 September 30, 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 September 30, 2016 were as follows: Product Liability Cases. Safety-Kleen has been named as a defendant in various lawsuits that are currently pending in various courts and jurisdictions throughout the United States, including approximately 62 proceedings (excluding cases which have been settled but not formally dismissed) as of September 30, 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 product liability 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 also 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 September 30, 2016 . From January 1, 2016 to September 30, 2016 , 18 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, three (including the BR Facility described below) involve facilities that are now owned or leased by the Company and 126 involve third party sites to which either the Company or the prior owners of certain of the Company’s facilities shipped wastes. Of the 126 third party sites, 32 are now settled, 17 are currently requiring expenditures on remediation and 77 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. Clean Harbors believes its potential liability could exceed $100,000 at 11 of the 126 third party sites. 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 storm water 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 126 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 and 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, McKesson and one other entity, the Company does not have an indemnity agreement with respect to any of the 126 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 September 30, 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	9 Months Ended
	Sep. 30, 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 did not record any tax charges or benefits as a result of the goodwill impairment charges recorded in the third quarter of 2016 and in the second quarter of 2015 . Absent the impact of the impairment charges on pre-tax income from operations the Company’s effective tax rate for the three and nine months ended September 30, 2016 was 47.8% and 80.3% compared to 46.2% and 44.4% , respectively, for the same periods in 2015 . The variations in the effective income tax rates for the three and nine months ended September 30, 2016 as compared to more customary relationships between pre-tax income and the provision for income taxes were primarily due to the Company not recognizing income tax benefits from current operating losses related to certain Canadian entities as well as the impacts of the non-deductible goodwill impairment charge. As of September 30, 2016 and December 31, 2015 , the Company had recorded $1.8 million and $2.1 million , respectively, of liabilities for unrecognized tax benefits and $0.3 million and $0.4 million of interest, respectively. Due to expiring statute of limitation periods, the Company believes that total unrecognized tax benefits will not decrease within the next 12 months.

SEGMENT REPORTING

SEGMENT REPORTING	9 Months Ended
	Sep. 30, 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 September 30, 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 certain operations for which the revenues are insignificant and not allocated to the segments for internal reporting purposes. 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) income plus accretion of environmental liabilities, depreciation and amortization, net interest expense, provision for income taxes, other non-cash charges not deemed representative of fundamental segment results and excludes other expense. 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 and nine months ended September 30, 2016 and 2015 (in thousands): For the Three Months Ended September 30, 2016 For the Three Months Ended September 30, 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 $ 232,482 $ 38,795 $ 492 $ 271,769 $ 253,069 $ 34,819 $ 506 $ 288,394 Industrial and Field Services 162,118 (12,734 ) (32 ) 149,352 307,226 (6,973 ) (313 ) 299,940 Kleen Performance Products 102,318 (9,761 ) — 92,557 100,827 (23,744 ) (6 ) 77,077 SK Environmental Services 194,764 (18,955 ) 1 175,810 171,832 (5,947 ) 2 165,887 Lodging Services 15,520 233 19 15,772 13,507 743 30 14,280 Oil and Gas Field Services 22,197 2,422 86 24,705 46,788 1,102 92 47,982 Corporate Items 121 — (566 ) (445 ) 117 — (311 ) (194 ) Total $ 729,520 $ — $ — $ 729,520 $ 893,366 $ — $ — $ 893,366 For the Nine Months Ended September 30, 2016 For the Nine Months Ended September 30, 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 $ 680,717 $ 109,217 $ 1,547 $ 791,481 $ 741,419 $ 108,037 $ 2,886 $ 852,342 Industrial and Field Services 437,546 (29,255 ) (335 ) 407,956 807,423 (24,764 ) (636 ) 782,023 Kleen Performance Products 256,572 (26,768 ) (1 ) 229,803 296,738 (63,429 ) (8 ) 233,301 SK Environmental Services 565,186 (59,561 ) 369 505,994 508,392 (26,331 ) 5 482,066 Lodging Services 47,583 634 54 48,271 68,782 1,899 127 70,808 Oil and Gas Field Services 73,445 5,733 221 79,399 138,992 4,588 141 143,721 Corporate Items 2,064 — (1,855 ) 209 347 — (2,515 ) (2,168 ) Total $ 2,063,113 $ — $ — $ 2,063,113 $ 2,562,093 $ — $ — $ 2,562,093 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 For the Nine Months Ended September 30, September 30, 2016 2015 2016 2015 Adjusted EBITDA: Technical Services $ 72,333 $ 79,048 $ 201,622 $ 219,257 Industrial and Field Services 18,579 62,460 40,643 145,850 Kleen Performance Products 22,803 12,123 37,358 23,471 SK Environmental Services 47,250 40,096 127,984 108,540 Lodging Services 4,104 1,827 8,145 12,589 Oil and Gas Field Services (4,425 ) 1,579 (10,026 ) 800 Corporate Items (33,993 ) (31,526 ) (101,310 ) (103,501 ) Total $ 126,651 $ 165,607 $ 304,416 $ 407,006 Reconciliation to Consolidated Statements of Operations: Accretion of environmental liabilities 2,476 2,577 7,529 7,795 Depreciation and amortization 73,360 69,060 215,655 205,189 Goodwill impairment charge 34,013 — 34,013 31,992 Income from operations 16,802 93,970 47,219 162,030 Other expense 198 139 737 390 Gain on sale of business (16,431 ) — (16,431 ) — Interest expense, net of interest income 21,565 19,017 62,192 57,704 Income before provision for income taxes $ 11,470 $ 74,814 $ 721 $ 103,936 The following table presents certain assets by reportable segment and in the aggregate (in thousands): September 30, 2016 Technical Industrial and Field Kleen Performance Products SK Environmental Services Lodging Services Oil and Gas Field Corporate Totals Property, plant and equipment, net $ 521,040 $ 211,712 $ 260,608 $ 328,655 $ 99,764 $ 139,137 $ 87,655 $ 1,648,571 Goodwill 57,637 106,349 68,482 238,165 — — — 470,633 Permits and other intangibles, net 74,646 11,490 141,039 264,864 5,951 9,347 — 507,337 Total assets $ 859,794 $ 366,929 $ 605,160 $ 920,333 $ 142,948 $ 229,480 $ 587,969 $ 3,712,613 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 intangibles, 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): September 30, 2016 December 31, 2015 United States $ 2,944,936 $ 2,575,746 Canada 767,677 851,949 Other foreign — 3,733 Total $ 3,712,613 $ 3,431,428

GUARANTOR AND NON-GUARANTOR SUB

GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION	9 Months Ended
	Sep. 30, 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 (the "U.S. Guarantor Subsidiaries"). Each U.S. Guarantor Subsidiary is a 100% owned subsidiary of Clean Harbors, Inc. ("Parent") 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 U.S. Guarantor Subsidiary will be released if the Company sells 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 Parent's Canadian or other foreign subsidiaries (the "Foreign Non-Guarantor Subsidiaries"). The following presents supplemental condensed consolidating financial information for Parent, the U.S. Guarantor Subsidiaries and the Foreign Non-Guarantor Subsidiaries, respectively. As discussed further in Note 11, “Financing Arrangements,” to the Company's consolidated financial statements included herein, on March 14, 2016, Parent issued $ 250.0 million aggregate principal amount of additional 2021 Notes. In connection with this offering, the proceeds were then transferred to the US Guarantor Subsidiaries and are reflected as an investment of Parent in the U.S. Guarantor Subsidiaries for the period ending September 30, 2016. Following is the condensed consolidating balance sheet at September 30, 2016 (in thousands): Clean Harbors, Inc. U.S. Guarantor Subsidiaries Foreign Non-Guarantor Subsidiaries Consolidating Adjustments Total Assets: Cash and cash equivalents $ 51,334 $ 170,183 $ 36,340 $ — $ 257,857 Intercompany receivables 190,728 300,656 34,665 (526,049 ) — Accounts receivable, net — 418,170 94,206 — 512,376 Other current assets 2,537 207,488 69,673 — 279,698 Property, plant and equipment, net — 1,217,704 430,867 — 1,648,571 Investments in subsidiaries 2,813,894 488,437 — (3,302,331 ) — Intercompany debt receivable — 212,171 3,701 (215,872 ) — Goodwill — 417,992 52,641 — 470,633 Permits and other intangibles, net — 439,543 67,794 — 507,337 Other long-term assets 1,197 9,552 25,392 — 36,141 Total assets $ 3,059,690 $ 3,881,896 $ 815,279 $ (4,044,252 ) $ 3,712,613 Liabilities and Stockholders’ Equity: Current liabilities $ 22,619 $ 438,298 $ 78,179 $ — $ 539,096 Intercompany payables 299,848 224,593 1,608 (526,049 ) — Closure, post-closure and remedial liabilities, net — 155,710 15,721 — 171,431 Long-term obligations 1,632,577 — — — 1,632,577 Intercompany debt payable 3,701 — 212,171 (215,872 ) — Other long-term liabilities — 249,401 19,163 — 268,564 Total liabilities 1,958,745 1,068,002 326,842 (741,921 ) 2,611,668 Stockholders’ equity 1,100,945 2,813,894 488,437 (3,302,331 ) 1,100,945 Total liabilities and stockholders’ equity $ 3,059,690 $ 3,881,896 $ 815,279 $ (4,044,252 ) $ 3,712,613 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, net — 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 September 30, 2016 (in thousands): Clean Harbors, Inc. U.S. Guarantor Subsidiaries Foreign Non-Guarantor Subsidiaries Consolidating Adjustments Total Revenues Service revenues $ — $ 461,139 $ 145,780 $ (12,694 ) $ 594,225 Product revenues — 118,106 20,072 (2,883 ) 135,295 Total revenues — 579,245 165,852 (15,577 ) 729,520 Cost of revenues (exclusive of items shown separately below) Service cost of revenues (598 ) 288,764 110,070 (12,694 ) 385,542 Product cost of revenues — 94,050 15,206 (2,883 ) 106,373 Total cost of revenues (598 ) 382,814 125,276 (15,577 ) 491,915 Selling, general and administrative expenses 23 88,652 22,279 — 110,954 Accretion of environmental liabilities — 2,243 233 — 2,476 Depreciation and amortization — 51,957 21,403 — 73,360 Goodwill impairment charge — — 34,013 — 34,013 Income (loss) from operations 575 53,579 (37,352 ) — 16,802 Other expense — (188 ) (10 ) — (198 ) Gain on sale of business — 1,288 15,143 — 16,431 Interest (expense) income (23,042 ) 1,456 21 — (21,565 ) Equity in earnings of subsidiaries, net of taxes 3,225 (22,341 ) — 19,116 — Intercompany interest income (expense) — 5,235 (5,235 ) — — (Loss) income before (benefit) provision for income taxes (19,242 ) 39,029 (27,433 ) 19,116 11,470 (Benefit) provision for income taxes (8,987 ) 35,803 (5,091 ) — 21,725 Net (loss) income (10,255 ) 3,226 (22,342 ) 19,116 (10,255 ) Other comprehensive loss (1,311 ) (1,311 ) (3,927 ) 5,238 (1,311 ) Comprehensive (loss) income $ (11,566 ) $ 1,915 $ (26,269 ) $ 24,354 $ (11,566 ) Following is the consolidating statement of operations for the three months ended September 30, 2015 (in thousands): Clean Harbors, Inc. U.S. Guarantor Subsidiaries Foreign Non-Guarantor Subsidiaries Consolidating Adjustments Total Revenues Service revenues $ — $ 612,814 $ 162,680 $ (14,827 ) $ 760,667 Product revenues — 117,653 17,591 (2,545 ) 132,699 Total revenues — 730,467 180,271 (17,372 ) 893,366 Cost of revenues (exclusive of items shown separately below) Service cost of revenues — 413,878 124,625 (14,827 ) 523,676 Product cost of revenues — 101,778 11,737 (2,545 ) 110,970 Total cost of revenues — 515,656 136,362 (17,372 ) 634,646 Selling, general and administrative expenses 25 72,811 20,277 — 93,113 Accretion of environmental liabilities — 2,277 300 — 2,577 Depreciation and amortization — 46,951 22,109 — 69,060 (Loss) income from operations (25 ) 92,772 1,223 — 93,970 Other income (expense) — 204 (343 ) — (139 ) Interest (expense) income (19,671 ) 613 41 — (19,017 ) Equity in earnings of subsidiaries, net of taxes 52,046 (2,341 ) — (49,705 ) — Intercompany interest income (expense) — 5,666 (5,666 ) — — Income (loss) before (benefit) provision for income taxes 32,350 96,914 (4,745 ) (49,705 ) 74,814 (Benefit) provision for income taxes (7,878 ) 44,868 (2,404 ) — 34,586 Net income (loss) 40,228 52,046 (2,341 ) (49,705 ) 40,228 Other comprehensive loss (53,541 ) (53,541 ) (34,150 ) 87,691 (53,541 ) Comprehensive loss $ (13,313 ) $ (1,495 ) $ (36,491 ) $ 37,986 $ (13,313 ) Following is the consolidating statement of operations for the nine months ended September 30, 2016 (in thousands): Clean Harbors, Inc. U.S. Guarantor Subsidiaries Foreign Non-Guarantor Subsidiaries Consolidating Adjustments Total Revenues Service revenues $ — $ 1,345,629 $ 399,216 $ (35,827 ) $ 1,709,018 Product revenues — 303,342 58,176 (7,423 ) 354,095 Total revenues — 1,648,971 457,392 (43,250 ) 2,063,113 Cost of revenues (exclusive of items shown separately below) Service cost of revenues (1,185 ) 864,071 321,153 (35,827 ) 1,148,212 Product cost of revenues — 252,512 42,895 (7,423 ) 287,984 Total cost of revenues (1,185 ) 1,116,583 364,048 (43,250 ) 1,436,196 Selling, general and administrative expenses 84 253,189 69,228 — 322,501 Accretion of environmental liabilities — 6,846 683 — 7,529 Depreciation and amortization — 151,348 64,307 — 215,655 Goodwill impairment charge — — 34,013 — 34,013 Income (loss) from operations 1,101 121,005 (74,887 ) — 47,219 Other income (expense) — 124 (861 ) — (737 ) Gain on sale of business — 1,288 15,143 — 16,431 Interest (expense) income (66,147 ) 3,851 104 — (62,192 ) Equity in earnings of subsidiaries, net of taxes 11,867 (58,031 ) — 46,164 — Intercompany interest income (expense) — 15,891 (15,891 ) — — (Loss) income before (benefit) provision for income taxes (53,179 ) 84,128 (76,392 ) 46,164 721 (Benefit) provision for income taxes (26,019 ) 72,260 (18,360 ) — 27,881 Net (loss) income (27,160 ) 11,868 (58,032 ) 46,164 (27,160 ) Other comprehensive gain 43,348 43,348 24,403 (67,751 ) 43,348 Comprehensive gain (loss) $ 16,188 $ 55,216 $ (33,629 ) $ (21,587 ) $ 16,188 Following is the consolidating statement of operations for the nine months ended September 30, 2015 (in thousands): Clean Harbors, Inc. U.S. Guarantor Subsidiaries Foreign Non-Guarantor Subsidiaries Consolidating Adjustments Total Revenues Service revenues $ — $ 1,659,739 $ 546,790 $ (48,185 ) $ 2,158,344 Product revenues — 349,524 63,239 (9,014 ) 403,749 Total revenues — 2,009,263 610,029 (57,199 ) 2,562,093 Cost of revenues (exclusive of items shown separately below) Service cost of revenues — 1,106,591 426,530 (48,185 ) 1,484,936 Product cost of revenues — 315,322 42,597 (9,014 ) 348,905 Total cost of revenues — 1,421,913 469,127 (57,199 ) 1,833,841 Selling, general and administrative expenses 75 247,472 73,699 — 321,246 Accretion of environmental liabilities — 6,870 925 — 7,795 Depreciation and amortization — 137,354 67,835 — 205,189 Goodwill impairment charge — 4,164 27,828 — 31,992 (Loss) income from operations (75 ) 191,490 (29,385 ) — 162,030 Other income (expense) — 483 (873 ) — (390 ) Interest (expense) income (58,962 ) 1,115 143 — (57,704 ) Equity in earnings of subsidiaries, net of taxes 78,956 (38,920 ) — (40,036 ) — Intercompany interest income (expense) — 17,679 (17,679 ) — — Income (loss) before (benefit) provision for income taxes 19,919 171,847 (47,794 ) (40,036 ) 103,936 (Benefit) provision for income taxes (23,615 ) 92,891 (8,874 ) — 60,402 Net income (loss) 43,534 78,956 (38,920 ) (40,036 ) 43,534 Other comprehensive loss (118,713 ) (118,713 ) (76,752 ) 195,465 (118,713 ) Comprehensive loss $ (75,179 ) $ (39,757 ) $ (115,672 ) $ 155,429 $ (75,179 ) Following is the condensed consolidating statement of cash flows for the nine months ended September 30, 2016 (in thousands): Clean Harbors, Inc. U.S. Guarantor Subsidiaries Foreign Non-Guarantor Subsidiaries Consolidating Adjustments Total Net cash from (used in) operating activities $ 43,033 $ 128,182 $ 7,612 $ — $ 178,827 Cash flows used in investing activities: Additions to property, plant and equipment — (152,836 ) (22,512 ) — (175,348 ) Proceeds from sales of fixed assets — 950 3,032 — 3,982 Acquisitions, net of cash acquired — (197,089 ) (10,000 ) — (207,089 ) Proceeds on sale of business — 18,885 28,249 — 47,134 Costs to obtain or renew permits — (949 ) (971 ) — (1,920 ) Purchase of available-for-sale securities (102 ) — (496 ) — (598 ) Investment in subsidiaries (250,625 ) — — 250,625 — Intercompany — (18,118 ) — 18,118 — Net cash used in investing activities (250,727 ) (349,157 ) (2,698 ) 268,743 (333,839 ) Cash flows from (used in) financing activities: Change in uncashed checks — (6,064 ) (1,020 ) — (7,084 ) Exercise of stock options 230 — — — 230 Issuance of restricted shares, net of shares remitted (2,500 ) — — — (2,500 ) Repurchases of common stock (15,869 ) — — — (15,869 ) Excess tax benefit of stock-based compensation 21 — — — 21 Deferred financing costs paid (2,614 ) — — — (2,614 ) Issuance of senior secured notes, including premium 250,625 250,625 — (250,625 ) 250,625 Intercompany 18,118 — — (18,118 ) — Intercompany debt — 63,118 (63,118 ) — — Net cash from (used in) financing activities 248,011 307,679 (64,138 ) (268,743 ) 222,809 Effect of exchange rate change on cash — — 5,352 — 5,352 Increase (decrease) in cash and cash equivalents 40,317 86,704 (53,872 ) — 73,149 Cash and cash equivalents, beginning of period 11,017 83,479 90,212 — 184,708 Cash and cash equivalents, end of period $ 51,334 $ 170,183 $ 36,340 $ — $ 257,857 Following is the condensed consolidating statement of cash flows for the nine months ended September 30, 2015 (in thousands): Clean Harbors, Inc. U.S. Guarantor Subsidiaries Foreign Non-Guarantor Subsidiaries Consolidating Adjustments Total Net cash from operating activities $ 9,503 $ 240,713 $ 59,377 $ — $ 309,593 Cash flows used in investing activities: Additions to property, plant and equipment — (162,329 ) (27,670 ) — (189,999 ) Proceeds from sale of fixed assets — 1,177 2,563 — 3,740 Acquisitions, net of cash acquired — (79,610 ) — — (79,610 ) Costs to obtain or renew permits — (4 ) (4,629 ) — (4,633 ) Intercompany — (71,182 ) — 71,182 — Net cash used in investing activities — (311,948 ) (29,736 ) 71,182 (270,502 ) Cash flows used in financing activities: Change in uncashed checks — (16,635 ) (5,247 ) — (21,882 ) Proceeds from exercise of stock options 397 — — — 397 Issuance of restricted shares, net of shares remitted (2,027 ) — — — (2,027 ) Repurchases of common stock (69,155 ) — — — (69,155 ) Excess tax benefit of stock-based compensation 102 — — — 102 Payments of capital leases — (203 ) (297 ) — (500 ) Intercompany 71,182 — — (71,182 ) — Net cash from (used in) financing activities 499 (16,838 ) (5,544 ) (71,182 ) (93,065 ) Effect of exchange rate change on cash — — (13,714 ) — (13,714 ) Increase (decrease) in cash and cash equivalents 10,002 (88,073 ) 10,383 — (67,688 ) Cash and cash equivalents, beginning of period 1,006 154,147 91,726 — 246,879 Cash and cash equivalents, end of period $ 11,008 $ 66,074 $ 102,109 $ — $ 179,191

SIGNIFICANT ACCOUNTING POLICI29

SIGNIFICANT ACCOUNTING POLICIES (Policies)	9 Months Ended
	Sep. 30, 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. ASU 2015-16 is applied prospectively to adjustments to provisional amounts that occur after the effective date of this update. The adoption of ASU 2015-16 as of January 1, 2016 did not have a material 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. ASU 2016-02 should be applied using a modified retrospective approach and early adoption is permitted. 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. ASU 2016-09 allows for retrospective or prospective application and early adoption is permitted. 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) . In May 2016, FASB issued ASU 2016-12, Revenue from Contracts with Customers (Topic 606) . ASU 2016-12 provided narrow scope improvements and practical expedients on assessing collectability, presentation of sales taxes, noncash consideration, and completed contracts and contract modifications at transition. 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 August 2016, FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments (a consensus of the Emerging Issues Task Force) . The amendment provides updated guidance on eight specific cash flow issues, including debt prepayment or debt extinguishment costs, settlement of zero-coupon debt instruments, contingent consideration payments made after a business combination, proceeds from settlement of insurance claims and corporate-owned life insurance, distributions received from equity method investees, beneficial interests in securitization transactions and separately identifiable cash flows and application of the predominance principle. Early adoption is permitted. The amendments in this update are effective for annual reporting periods (including interim reporting periods within those periods) beginning after December 15, 2017.

BUSINESS COMBINATIONS (Tables)

BUSINESS COMBINATIONS (Tables)	9 Months Ended
	Sep. 30, 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): Preliminary Allocations Measurement Period Adjustments Final Allocations 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 purchase price, net of cash acquired $ 77,092 $ 2,244 $ 79,336 The components and preliminary allocation of the purchase price consist of the following amounts (in thousands): At Acquisition Dates Measurement Period Adjustments At Acquisition Dates As Reported Accounts receivable $ 17,384 $ (1,016 ) $ 16,368 Inventories and supplies 13,859 (1,071 ) 12,788 Prepaid expenses and other current assets 920 9 929 Property, plant and equipment 132,705 (1,843 ) 130,862 Permits and other intangibles 23,405 3,651 27,056 Deferred tax assets 855 (2 ) 853 Current liabilities (19,486 ) (438 ) (19,924 ) Closure and post-closure liabilities (1,709 ) (699 ) (2,408 ) Deferred taxes, unrecognized tax benefits and other long-term liabilities (9,518 ) (1,894 ) (11,412 ) Total identifiable net assets 158,415 (3,303 ) 155,112 Goodwill 48,674 1,393 50,067 Total purchase price, net of cash acquired $ 207,089 $ (1,910 ) $ 205,179

DISPOSITION OF BUSINESS (Tables

DISPOSITION OF BUSINESS (Tables)	9 Months Ended
	Sep. 30, 2016
Discontinued Operations and Disposal Groups [Abstract]
Disposition of Business	The following table presents (loss) income attributable to the Catalyst Services business included in the Company's consolidated results of operations for each of the periods shown and through its disposition on September 30, 2016, in thousands: Three Months Ended Nine Months Ended September 30, September 30, 2016 2015 2016 2015 (Loss) income before provision for income taxes (1,218 ) 1,089 290 2,489 The following table presents the carrying amounts of the Company's Catalyst Services business immediately preceding the disposition on September 1, 2016, in thousands: September 1, 2016 Total current assets $ 19,135 Property, plant and equipment, net 11,126 Total other assets 6,500 Total assets divested $ 36,761 Total current liabilities 4,040 Total other liabilities 566 Total liabilities divested $ 4,606 Net carrying value divested $ 32,155

INVENTORIES AND SUPPLIES (Table

INVENTORIES AND SUPPLIES (Tables)	9 Months Ended
	Sep. 30, 2016
Inventory Disclosure [Abstract]
Schedule of Inventory	Inventories and supplies consisted of the following (in thousands): September 30, 2016 December 31, 2015 Oil and oil products $ 57,403 $ 33,603 Supplies and drums 84,133 78,132 Solvent and solutions 8,502 8,868 Modular camp accommodations 15,492 15,126 Other 11,758 13,792 Total inventories and supplies $ 177,288 $ 149,521

PROPERTY, PLANT AND EQUIPMENT (

PROPERTY, PLANT AND EQUIPMENT (Tables)	9 Months Ended
	Sep. 30, 2016
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	Property, plant and equipment consisted of the following (in thousands): September 30, 2016 December 31, 2015 Land $ 122,337 $ 100,582 Asset retirement costs (non-landfill) 14,590 12,434 Landfill assets 142,587 136,624 Buildings and improvements 379,435 344,209 Camp equipment 156,838 149,361 Vehicles 535,804 500,619 Equipment 1,465,378 1,328,915 Furniture and fixtures 5,546 5,337 Construction in progress 147,569 113,657 2,970,084 2,691,738 Less - accumulated depreciation and amortization 1,321,513 1,159,271 Total property, plant and equipment, net $ 1,648,571 $ 1,532,467

GOODWILL AND OTHER INTANGIBLE34

GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)	9 Months Ended
	Sep. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of changes to goodwill	The changes in goodwill for the nine months ended September 30, 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 Acquired from current period acquisitions 8,989 4,925 18,629 17,524 — — 50,067 Measurement period adjustment from prior period acquisitions — — — 2,095 — — 2,095 Decrease from disposition of business — (4,994 ) — (4,994 ) Goodwill impairment charge (34,013 ) (34,013 ) Foreign currency translation and other (619 ) 1,132 98 1,957 1,805 — 4,373 Balance at September 30, 2016 $ 57,637 $ 106,349 $ 68,482 $ 238,165 $ — $ — $ 470,633
Summary of indefinite-lived intangible assets	As of September 30, 2016 and December 31, 2015 , the Company's total finite-lived and indefinite-lived intangible assets consisted of the following (in thousands): September 30, 2016 December 31, 2015 Cost Accumulated Net Weighted Cost Accumulated Net Weighted Permits $ 170,194 $ 66,510 $ 103,684 20.3 $ 161,396 $ 61,142 $ 100,254 19.0 Customer and supplier relationships 389,002 120,922 268,080 12.5 374,866 99,463 275,403 10.1 Other intangible assets 40,266 27,548 12,718 7.8 31,416 22,581 8,835 1.5 Total amortizable permits and other intangible assets 599,462 214,980 384,482 14.4 567,678 183,186 384,492 10.0 Trademarks and trade names 122,855 — 122,855 Indefinite 122,326 — 122,326 Indefinite Total permits and other intangible assets $ 722,317 $ 214,980 $ 507,337 $ 690,004 $ 183,186 $ 506,818
Schedule of finite-Lived intangible assets	As of September 30, 2016 and December 31, 2015 , the Company's total finite-lived and indefinite-lived intangible assets consisted of the following (in thousands): September 30, 2016 December 31, 2015 Cost Accumulated Net Weighted Cost Accumulated Net Weighted Permits $ 170,194 $ 66,510 $ 103,684 20.3 $ 161,396 $ 61,142 $ 100,254 19.0 Customer and supplier relationships 389,002 120,922 268,080 12.5 374,866 99,463 275,403 10.1 Other intangible assets 40,266 27,548 12,718 7.8 31,416 22,581 8,835 1.5 Total amortizable permits and other intangible assets 599,462 214,980 384,482 14.4 567,678 183,186 384,492 10.0 Trademarks and trade names 122,855 — 122,855 Indefinite 122,326 — 122,326 Indefinite Total permits and other intangible assets $ 722,317 $ 214,980 $ 507,337 $ 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 September 30, 2016 was as follows (in thousands): Years Ending December 31, Expected Amortization 2016 (three months) $ 9,533 2017 35,325 2018 32,345 2019 29,612 2020 27,316 Thereafter 250,351 $ 384,482

ACCRUED EXPENSES (Tables)

ACCRUED EXPENSES (Tables)	9 Months Ended
	Sep. 30, 2016
Payables and Accruals [Abstract]
Accrued expenses	Accrued expenses consisted of the following at September 30, 2016 and December 31, 2015 (in thousands): September 30, 2016 December 31, 2015 Insurance $ 59,254 $ 55,899 Interest 21,859 20,500 Accrued compensation and benefits 46,921 35,646 Income, real estate, sales and other taxes 60,020 37,095 Other 38,026 44,520 $ 226,080 $ 193,660

CLOSURE AND POST-CLOSURE LIAB36

CLOSURE AND POST-CLOSURE LIABILITIES (Tables)	9 Months Ended
	Sep. 30, 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 September 30, 2016 were as follows (in thousands): Landfill Non-Landfill Total Balance at January 1, 2016 $ 32,023 $ 24,226 $ 56,249 Liabilities assumed in acquisitions — 2,408 2,408 Adjustments during the measurement period related to 2015 acquisitions — 657 657 New asset retirement obligations 1,650 — 1,650 Accretion 1,996 1,748 3,744 Changes in estimates recorded to statement of operations (597 ) (114 ) (711 ) Expenditures (904 ) (709 ) (1,613 ) Currency translation and other 130 53 183 Balance at September 30, 2016 $ 34,298 $ 28,269 $ 62,567

REMEDIAL LIABILITIES (Tables)

REMEDIAL LIABILITIES (Tables)	9 Months Ended
	Sep. 30, 2016
Environmental Remediation Obligations [Abstract]
Changes to remedial liabilities	The changes to remedial liabilities for the nine months ended September 30, 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 Liabilities assumed in acquisition — — 4 4 Accretion 82 2,049 1,654 3,785 Changes in estimates recorded to statement of operations 71 (448 ) 739 362 Expenditures (88 ) (2,957 ) (4,716 ) (7,761 ) Currency translation and other — 45 654 699 Balance at September 30, 2016 $ 2,392 $ 62,302 $ 64,387 $ 129,081

FINANCING ARRANGEMENTS (Tables)

FINANCING ARRANGEMENTS (Tables)	9 Months Ended
	Sep. 30, 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): September 30, 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 (12,423 ) (12,457 ) Long-term obligations, at carrying value $ 1,632,577 $ 1,382,543

(LOSS) EARNINGS PER SHARE (Tabl

(LOSS) EARNINGS PER SHARE (Tables)	9 Months Ended
	Sep. 30, 2016
Earnings Per Share [Abstract]
Reconciliation of basic and diluted earnings per share computations	The following are computations of basic and diluted (loss) earnings per share (in thousands except for per share amounts): Three Months Ended Nine Months Ended September 30, September 30, 2016 2015 2016 2015 Numerator for basic and diluted (loss) earnings per share: Net (loss) income $ (10,255 ) $ 40,228 $ (27,160 ) $ 43,534 Denominator: Basic shares outstanding 57,487 58,161 57,575 58,799 Dilutive effect of equity-based compensation awards — 107 — 99 Dilutive shares outstanding 57,487 58,268 57,575 58,898 Basic (loss) earnings per share: $ (0.18 ) $ 0.69 $ (0.47 ) $ 0.74 Diluted (loss) earnings per share: $ (0.18 ) $ 0.69 $ (0.47 ) $ 0.74

ACCUMULATED OTHER COMPREHENSI40

ACCUMULATED OTHER COMPREHENSIVE LOSS (Tables)	9 Months Ended
	Sep. 30, 2016
Equity [Abstract]
Schedule of accumulated other comprehensive loss	The changes in accumulated other comprehensive loss by component and related tax effects for the nine months ended September 30, 2016 were as follows (in thousands): Foreign Currency Translation Unrealized Gains on Available-For-Sale Securities Unfunded Pension Liability Total Balance at January 1, 2016 $ (252,939 ) $ — $ (1,953 ) $ (254,892 ) Other comprehensive income (loss) before reclassifications 43,706 (596 ) — 43,110 Tax effects — 238 — 238 Other comprehensive income (loss) $ 43,706 $ (358 ) $ — $ 43,348 Balance at September 30, 2016 $ (209,233 ) $ (358 ) $ (1,953 ) $ (211,544 )

STOCK-BASED COMPENSATION (Table

STOCK-BASED COMPENSATION (Tables)	9 Months Ended
	Sep. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Summary of restricted stock awards	The following table summarizes information about restricted stock awards for the nine months ended September 30, 2016 : Restricted Stock Number of Shares Weighted Average Grant-Date Fair Value Balance at January 1, 2016 362,618 $ 55.79 Granted 335,992 $ 50.87 Vested (168,565 ) $ 54.06 Forfeited (46,298 ) $ 53.04 Balance at September 30, 2016 483,747 $ 53.23
Summary of performance stock awards	The following table summarizes information about performance stock awards for the nine months ended September 30, 2016 : Performance Stock Number of Shares Weighted Average Grant-Date Fair Value Balance at January 1, 2016 187,274 $ 57.13 Granted 207,624 $ 54.21 Vested (8,420 ) $ 61.90 Forfeited (33,469 ) $ 55.96 Balance at September 30, 2016 353,009 $ 55.39

SEGMENT REPORTING (Tables)

SEGMENT REPORTING (Tables)	9 Months Ended
	Sep. 30, 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 and nine months ended September 30, 2016 and 2015 (in thousands): For the Three Months Ended September 30, 2016 For the Three Months Ended September 30, 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 $ 232,482 $ 38,795 $ 492 $ 271,769 $ 253,069 $ 34,819 $ 506 $ 288,394 Industrial and Field Services 162,118 (12,734 ) (32 ) 149,352 307,226 (6,973 ) (313 ) 299,940 Kleen Performance Products 102,318 (9,761 ) — 92,557 100,827 (23,744 ) (6 ) 77,077 SK Environmental Services 194,764 (18,955 ) 1 175,810 171,832 (5,947 ) 2 165,887 Lodging Services 15,520 233 19 15,772 13,507 743 30 14,280 Oil and Gas Field Services 22,197 2,422 86 24,705 46,788 1,102 92 47,982 Corporate Items 121 — (566 ) (445 ) 117 — (311 ) (194 ) Total $ 729,520 $ — $ — $ 729,520 $ 893,366 $ — $ — $ 893,366 For the Nine Months Ended September 30, 2016 For the Nine Months Ended September 30, 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 $ 680,717 $ 109,217 $ 1,547 $ 791,481 $ 741,419 $ 108,037 $ 2,886 $ 852,342 Industrial and Field Services 437,546 (29,255 ) (335 ) 407,956 807,423 (24,764 ) (636 ) 782,023 Kleen Performance Products 256,572 (26,768 ) (1 ) 229,803 296,738 (63,429 ) (8 ) 233,301 SK Environmental Services 565,186 (59,561 ) 369 505,994 508,392 (26,331 ) 5 482,066 Lodging Services 47,583 634 54 48,271 68,782 1,899 127 70,808 Oil and Gas Field Services 73,445 5,733 221 79,399 138,992 4,588 141 143,721 Corporate Items 2,064 — (1,855 ) 209 347 — (2,515 ) (2,168 ) Total $ 2,063,113 $ — $ — $ 2,063,113 $ 2,562,093 $ — $ — $ 2,562,093
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 For the Nine Months Ended September 30, September 30, 2016 2015 2016 2015 Adjusted EBITDA: Technical Services $ 72,333 $ 79,048 $ 201,622 $ 219,257 Industrial and Field Services 18,579 62,460 40,643 145,850 Kleen Performance Products 22,803 12,123 37,358 23,471 SK Environmental Services 47,250 40,096 127,984 108,540 Lodging Services 4,104 1,827 8,145 12,589 Oil and Gas Field Services (4,425 ) 1,579 (10,026 ) 800 Corporate Items (33,993 ) (31,526 ) (101,310 ) (103,501 ) Total $ 126,651 $ 165,607 $ 304,416 $ 407,006 Reconciliation to Consolidated Statements of Operations: Accretion of environmental liabilities 2,476 2,577 7,529 7,795 Depreciation and amortization 73,360 69,060 215,655 205,189 Goodwill impairment charge 34,013 — 34,013 31,992 Income from operations 16,802 93,970 47,219 162,030 Other expense 198 139 737 390 Gain on sale of business (16,431 ) — (16,431 ) — Interest expense, net of interest income 21,565 19,017 62,192 57,704 Income before provision for income taxes $ 11,470 $ 74,814 $ 721 $ 103,936
PP&E, intangible assets and total assets by segment	The following table presents certain assets by reportable segment and in the aggregate (in thousands): September 30, 2016 Technical Industrial and Field Kleen Performance Products SK Environmental Services Lodging Services Oil and Gas Field Corporate Totals Property, plant and equipment, net $ 521,040 $ 211,712 $ 260,608 $ 328,655 $ 99,764 $ 139,137 $ 87,655 $ 1,648,571 Goodwill 57,637 106,349 68,482 238,165 — — — 470,633 Permits and other intangibles, net 74,646 11,490 141,039 264,864 5,951 9,347 — 507,337 Total assets $ 859,794 $ 366,929 $ 605,160 $ 920,333 $ 142,948 $ 229,480 $ 587,969 $ 3,712,613 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 intangibles, 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): September 30, 2016 December 31, 2015 United States $ 2,944,936 $ 2,575,746 Canada 767,677 851,949 Other foreign — 3,733 Total $ 3,712,613 $ 3,431,428

GUARANTOR AND NON-GUARANTOR S43

GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION (Tables)	9 Months Ended
	Sep. 30, 2016
Guarantor and Non-Guarantor Subsidiaries Financial Information [Abstract]
Schedule of condensed consolidating balance sheet	Following is the condensed consolidating balance sheet at September 30, 2016 (in thousands): Clean Harbors, Inc. U.S. Guarantor Subsidiaries Foreign Non-Guarantor Subsidiaries Consolidating Adjustments Total Assets: Cash and cash equivalents $ 51,334 $ 170,183 $ 36,340 $ — $ 257,857 Intercompany receivables 190,728 300,656 34,665 (526,049 ) — Accounts receivable, net — 418,170 94,206 — 512,376 Other current assets 2,537 207,488 69,673 — 279,698 Property, plant and equipment, net — 1,217,704 430,867 — 1,648,571 Investments in subsidiaries 2,813,894 488,437 — (3,302,331 ) — Intercompany debt receivable — 212,171 3,701 (215,872 ) — Goodwill — 417,992 52,641 — 470,633 Permits and other intangibles, net — 439,543 67,794 — 507,337 Other long-term assets 1,197 9,552 25,392 — 36,141 Total assets $ 3,059,690 $ 3,881,896 $ 815,279 $ (4,044,252 ) $ 3,712,613 Liabilities and Stockholders’ Equity: Current liabilities $ 22,619 $ 438,298 $ 78,179 $ — $ 539,096 Intercompany payables 299,848 224,593 1,608 (526,049 ) — Closure, post-closure and remedial liabilities, net — 155,710 15,721 — 171,431 Long-term obligations 1,632,577 — — — 1,632,577 Intercompany debt payable 3,701 — 212,171 (215,872 ) — Other long-term liabilities — 249,401 19,163 — 268,564 Total liabilities 1,958,745 1,068,002 326,842 (741,921 ) 2,611,668 Stockholders’ equity 1,100,945 2,813,894 488,437 (3,302,331 ) 1,100,945 Total liabilities and stockholders’ equity $ 3,059,690 $ 3,881,896 $ 815,279 $ (4,044,252 ) $ 3,712,613 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, net — 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 condensed consolidating statement of income	Following is the consolidating statement of operations for the three months ended September 30, 2016 (in thousands): Clean Harbors, Inc. U.S. Guarantor Subsidiaries Foreign Non-Guarantor Subsidiaries Consolidating Adjustments Total Revenues Service revenues $ — $ 461,139 $ 145,780 $ (12,694 ) $ 594,225 Product revenues — 118,106 20,072 (2,883 ) 135,295 Total revenues — 579,245 165,852 (15,577 ) 729,520 Cost of revenues (exclusive of items shown separately below) Service cost of revenues (598 ) 288,764 110,070 (12,694 ) 385,542 Product cost of revenues — 94,050 15,206 (2,883 ) 106,373 Total cost of revenues (598 ) 382,814 125,276 (15,577 ) 491,915 Selling, general and administrative expenses 23 88,652 22,279 — 110,954 Accretion of environmental liabilities — 2,243 233 — 2,476 Depreciation and amortization — 51,957 21,403 — 73,360 Goodwill impairment charge — — 34,013 — 34,013 Income (loss) from operations 575 53,579 (37,352 ) — 16,802 Other expense — (188 ) (10 ) — (198 ) Gain on sale of business — 1,288 15,143 — 16,431 Interest (expense) income (23,042 ) 1,456 21 — (21,565 ) Equity in earnings of subsidiaries, net of taxes 3,225 (22,341 ) — 19,116 — Intercompany interest income (expense) — 5,235 (5,235 ) — — (Loss) income before (benefit) provision for income taxes (19,242 ) 39,029 (27,433 ) 19,116 11,470 (Benefit) provision for income taxes (8,987 ) 35,803 (5,091 ) — 21,725 Net (loss) income (10,255 ) 3,226 (22,342 ) 19,116 (10,255 ) Other comprehensive loss (1,311 ) (1,311 ) (3,927 ) 5,238 (1,311 ) Comprehensive (loss) income $ (11,566 ) $ 1,915 $ (26,269 ) $ 24,354 $ (11,566 ) Following is the consolidating statement of operations for the three months ended September 30, 2015 (in thousands): Clean Harbors, Inc. U.S. Guarantor Subsidiaries Foreign Non-Guarantor Subsidiaries Consolidating Adjustments Total Revenues Service revenues $ — $ 612,814 $ 162,680 $ (14,827 ) $ 760,667 Product revenues — 117,653 17,591 (2,545 ) 132,699 Total revenues — 730,467 180,271 (17,372 ) 893,366 Cost of revenues (exclusive of items shown separately below) Service cost of revenues — 413,878 124,625 (14,827 ) 523,676 Product cost of revenues — 101,778 11,737 (2,545 ) 110,970 Total cost of revenues — 515,656 136,362 (17,372 ) 634,646 Selling, general and administrative expenses 25 72,811 20,277 — 93,113 Accretion of environmental liabilities — 2,277 300 — 2,577 Depreciation and amortization — 46,951 22,109 — 69,060 (Loss) income from operations (25 ) 92,772 1,223 — 93,970 Other income (expense) — 204 (343 ) — (139 ) Interest (expense) income (19,671 ) 613 41 — (19,017 ) Equity in earnings of subsidiaries, net of taxes 52,046 (2,341 ) — (49,705 ) — Intercompany interest income (expense) — 5,666 (5,666 ) — — Income (loss) before (benefit) provision for income taxes 32,350 96,914 (4,745 ) (49,705 ) 74,814 (Benefit) provision for income taxes (7,878 ) 44,868 (2,404 ) — 34,586 Net income (loss) 40,228 52,046 (2,341 ) (49,705 ) 40,228 Other comprehensive loss (53,541 ) (53,541 ) (34,150 ) 87,691 (53,541 ) Comprehensive loss $ (13,313 ) $ (1,495 ) $ (36,491 ) $ 37,986 $ (13,313 ) Following is the consolidating statement of operations for the nine months ended September 30, 2016 (in thousands): Clean Harbors, Inc. U.S. Guarantor Subsidiaries Foreign Non-Guarantor Subsidiaries Consolidating Adjustments Total Revenues Service revenues $ — $ 1,345,629 $ 399,216 $ (35,827 ) $ 1,709,018 Product revenues — 303,342 58,176 (7,423 ) 354,095 Total revenues — 1,648,971 457,392 (43,250 ) 2,063,113 Cost of revenues (exclusive of items shown separately below) Service cost of revenues (1,185 ) 864,071 321,153 (35,827 ) 1,148,212 Product cost of revenues — 252,512 42,895 (7,423 ) 287,984 Total cost of revenues (1,185 ) 1,116,583 364,048 (43,250 ) 1,436,196 Selling, general and administrative expenses 84 253,189 69,228 — 322,501 Accretion of environmental liabilities — 6,846 683 — 7,529 Depreciation and amortization — 151,348 64,307 — 215,655 Goodwill impairment charge — — 34,013 — 34,013 Income (loss) from operations 1,101 121,005 (74,887 ) — 47,219 Other income (expense) — 124 (861 ) — (737 ) Gain on sale of business — 1,288 15,143 — 16,431 Interest (expense) income (66,147 ) 3,851 104 — (62,192 ) Equity in earnings of subsidiaries, net of taxes 11,867 (58,031 ) — 46,164 — Intercompany interest income (expense) — 15,891 (15,891 ) — — (Loss) income before (benefit) provision for income taxes (53,179 ) 84,128 (76,392 ) 46,164 721 (Benefit) provision for income taxes (26,019 ) 72,260 (18,360 ) — 27,881 Net (loss) income (27,160 ) 11,868 (58,032 ) 46,164 (27,160 ) Other comprehensive gain 43,348 43,348 24,403 (67,751 ) 43,348 Comprehensive gain (loss) $ 16,188 $ 55,216 $ (33,629 ) $ (21,587 ) $ 16,188 Following is the consolidating statement of operations for the nine months ended September 30, 2015 (in thousands): Clean Harbors, Inc. U.S. Guarantor Subsidiaries Foreign Non-Guarantor Subsidiaries Consolidating Adjustments Total Revenues Service revenues $ — $ 1,659,739 $ 546,790 $ (48,185 ) $ 2,158,344 Product revenues — 349,524 63,239 (9,014 ) 403,749 Total revenues — 2,009,263 610,029 (57,199 ) 2,562,093 Cost of revenues (exclusive of items shown separately below) Service cost of revenues — 1,106,591 426,530 (48,185 ) 1,484,936 Product cost of revenues — 315,322 42,597 (9,014 ) 348,905 Total cost of revenues — 1,421,913 469,127 (57,199 ) 1,833,841 Selling, general and administrative expenses 75 247,472 73,699 — 321,246 Accretion of environmental liabilities — 6,870 925 — 7,795 Depreciation and amortization — 137,354 67,835 — 205,189 Goodwill impairment charge — 4,164 27,828 — 31,992 (Loss) income from operations (75 ) 191,490 (29,385 ) — 162,030 Other income (expense) — 483 (873 ) — (390 ) Interest (expense) income (58,962 ) 1,115 143 — (57,704 ) Equity in earnings of subsidiaries, net of taxes 78,956 (38,920 ) — (40,036 ) — Intercompany interest income (expense) — 17,679 (17,679 ) — — Income (loss) before (benefit) provision for income taxes 19,919 171,847 (47,794 ) (40,036 ) 103,936 (Benefit) provision for income taxes (23,615 ) 92,891 (8,874 ) — 60,402 Net income (loss) 43,534 78,956 (38,920 ) (40,036 ) 43,534 Other comprehensive loss (118,713 ) (118,713 ) (76,752 ) 195,465 (118,713 ) Comprehensive loss $ (75,179 ) $ (39,757 ) $ (115,672 ) $ 155,429 $ (75,179 )
Schedule of condensed consolidating statement of cash flows	Following is the condensed consolidating statement of cash flows for the nine months ended September 30, 2016 (in thousands): Clean Harbors, Inc. U.S. Guarantor Subsidiaries Foreign Non-Guarantor Subsidiaries Consolidating Adjustments Total Net cash from (used in) operating activities $ 43,033 $ 128,182 $ 7,612 $ — $ 178,827 Cash flows used in investing activities: Additions to property, plant and equipment — (152,836 ) (22,512 ) — (175,348 ) Proceeds from sales of fixed assets — 950 3,032 — 3,982 Acquisitions, net of cash acquired — (197,089 ) (10,000 ) — (207,089 ) Proceeds on sale of business — 18,885 28,249 — 47,134 Costs to obtain or renew permits — (949 ) (971 ) — (1,920 ) Purchase of available-for-sale securities (102 ) — (496 ) — (598 ) Investment in subsidiaries (250,625 ) — — 250,625 — Intercompany — (18,118 ) — 18,118 — Net cash used in investing activities (250,727 ) (349,157 ) (2,698 ) 268,743 (333,839 ) Cash flows from (used in) financing activities: Change in uncashed checks — (6,064 ) (1,020 ) — (7,084 ) Exercise of stock options 230 — — — 230 Issuance of restricted shares, net of shares remitted (2,500 ) — — — (2,500 ) Repurchases of common stock (15,869 ) — — — (15,869 ) Excess tax benefit of stock-based compensation 21 — — — 21 Deferred financing costs paid (2,614 ) — — — (2,614 ) Issuance of senior secured notes, including premium 250,625 250,625 — (250,625 ) 250,625 Intercompany 18,118 — — (18,118 ) — Intercompany debt — 63,118 (63,118 ) — — Net cash from (used in) financing activities 248,011 307,679 (64,138 ) (268,743 ) 222,809 Effect of exchange rate change on cash — — 5,352 — 5,352 Increase (decrease) in cash and cash equivalents 40,317 86,704 (53,872 ) — 73,149 Cash and cash equivalents, beginning of period 11,017 83,479 90,212 — 184,708 Cash and cash equivalents, end of period $ 51,334 $ 170,183 $ 36,340 $ — $ 257,857 Following is the condensed consolidating statement of cash flows for the nine months ended September 30, 2015 (in thousands): Clean Harbors, Inc. U.S. Guarantor Subsidiaries Foreign Non-Guarantor Subsidiaries Consolidating Adjustments Total Net cash from operating activities $ 9,503 $ 240,713 $ 59,377 $ — $ 309,593 Cash flows used in investing activities: Additions to property, plant and equipment — (162,329 ) (27,670 ) — (189,999 ) Proceeds from sale of fixed assets — 1,177 2,563 — 3,740 Acquisitions, net of cash acquired — (79,610 ) — — (79,610 ) Costs to obtain or renew permits — (4 ) (4,629 ) — (4,633 ) Intercompany — (71,182 ) — 71,182 — Net cash used in investing activities — (311,948 ) (29,736 ) 71,182 (270,502 ) Cash flows used in financing activities: Change in uncashed checks — (16,635 ) (5,247 ) — (21,882 ) Proceeds from exercise of stock options 397 — — — 397 Issuance of restricted shares, net of shares remitted (2,027 ) — — — (2,027 ) Repurchases of common stock (69,155 ) — — — (69,155 ) Excess tax benefit of stock-based compensation 102 — — — 102 Payments of capital leases — (203 ) (297 ) — (500 ) Intercompany 71,182 — — (71,182 ) — Net cash from (used in) financing activities 499 (16,838 ) (5,544 ) (71,182 ) (93,065 ) Effect of exchange rate change on cash — — (13,714 ) — (13,714 ) Increase (decrease) in cash and cash equivalents 10,002 (88,073 ) 10,383 — (67,688 ) Cash and cash equivalents, beginning of period 1,006 154,147 91,726 — 246,879 Cash and cash equivalents, end of period $ 11,008 $ 66,074 $ 102,109 $ — $ 179,191

BUSINESS COMBINATIONS (Narrativ

BUSINESS COMBINATIONS (Narrative) (Details) $ in Thousands	Apr. 11, 2015USD ($)	Dec. 31, 2015USD ($)	Sep. 30, 2016USD ($)	Sep. 30, 2016USD ($)aquisitionrerefinery
Business Acquisition [Line Items]
Goodwill, acquired during period				$ 50,067
2016 Acquisitions
Business Acquisition [Line Items]
Number of acquisitions | aquisition				7
Number of re-refineries acquired | rerefinery				2
Purchase price				$ 205,200
Revenue from acquisitions			$ 26,000	38,100
Acquisition-related costs			$ 700	$ 1,200
Thermo Fluids Inc.
Business Acquisition [Line Items]
Purchase price	$ 79,300
Privately Owned Domestic Company
Business Acquisition [Line Items]
Purchase price		$ 14,700
Goodwill, acquired during period		$ 7,400

BUSINESS COMBINATIONS (Assets A

BUSINESS COMBINATIONS (Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Thousands	9 Months Ended	18 Months Ended
	Sep. 30, 2016	Sep. 30, 2016	Dec. 31, 2015	Apr. 11, 2015
Business Acquisition [Line Items]
Goodwill	$ 470,633	$ 470,633	$ 453,105
2016 Acquisitions
Business Acquisition [Line Items]
Accounts receivable	16,368	16,368
Measurement period adjustments, accounts receivable	(1,016)
Inventories and supplies	12,788	12,788
Measurement period adjustment, inventories and supplies	(1,071)
Prepaid and other current assets	929	929
Measurement period adjustment, prepaid and other current assets	9
Property, plant and equipment	130,862	130,862
Measurement period adjustments, property, plant and equipment	(1,843)
Permits and other intangibles	27,056	27,056
Measurement period adjustments, permits and other intangibles	3,651
Deferred tax assets	853	853
Measurement period adjustments, deferred tax assets	(2)
Current liabilities	(19,924)	(19,924)
Measurement period adjustments, current liabilities	(438)
Closure and post-closure liabilities	(2,408)	(2,408)
Measurement period adjustments, closure and post-closure liabilities	(699)
Deferred taxes, unrecognized tax benefits and other long-term liabilities	(11,412)	(11,412)
Measurement period adjustments, deferred taxes, unrecognized tax benefits and other long-term liabilities	(1,894)
Total identifiable net assets	155,112	155,112
Measurement period adjustments, total identifiable net assets	(3,303)
Goodwill	50,067	50,067
Measurement period adjustments, goodwill	1,393
Total purchase price, net of cash acquired	205,179	205,179
Measurement period adjustments, total purchase price, net of cash acquired	(1,910)
Thermo Fluids Inc.
Business Acquisition [Line Items]
Accounts receivable	7,301	7,301
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	665
Measurement period adjustment, prepaid and other current assets		(1,084)
Property, plant and equipment	27,641	27,641
Measurement period adjustments, property, plant and equipment		(2,827)
Permits and other intangibles	18,100	18,100
Measurement period adjustments, permits and other intangibles		(1,900)
Current liabilities	(5,884)	(5,884)
Measurement period adjustments, current liabilities		(25)
Closure and post-closure liabilities	(2,333)	(2,333)
Measurement period adjustments, closure and post-closure liabilities		(657)
Deferred taxes, unrecognized tax benefits and other long-term liabilities	(9,174)	(9,174)
Measurement period adjustments, deferred taxes, unrecognized tax benefits and other long-term liabilities		3,907
Total identifiable net assets	38,107	38,107
Measurement period adjustments, total identifiable net assets		(2,394)
Goodwill	41,229	41,229
Measurement period adjustments, goodwill		4,638
Total purchase price, net of cash acquired	79,336	79,336
Measurement period adjustments, total purchase price, net of cash acquired		2,244
At Acquisition Dates | 2016 Acquisitions
Business Acquisition [Line Items]
Accounts receivable	17,384	17,384
Inventories and supplies	13,859	13,859
Prepaid and other current assets	920	920
Property, plant and equipment	132,705	132,705
Permits and other intangibles	23,405	23,405
Deferred tax assets	855	855
Current liabilities	(19,486)	(19,486)
Closure and post-closure liabilities	(1,709)	(1,709)
Deferred taxes, unrecognized tax benefits and other long-term liabilities	(9,518)	(9,518)
Total identifiable net assets	158,415	158,415
Goodwill	48,674	48,674
Total purchase price, net of cash acquired	$ 207,089	$ 207,089
At Acquisition Dates | Thermo Fluids Inc.
Business Acquisition [Line Items]
Accounts receivable				$ 7,109
Inventories and supplies				1,791
Prepaid and other current assets				1,749
Property, plant and equipment				30,468
Permits and other intangibles				20,000
Current liabilities				(5,859)
Closure and post-closure liabilities				(1,676)
Deferred taxes, unrecognized tax benefits and other long-term liabilities				(13,081)
Total identifiable net assets				40,501
Goodwill				36,591
Total purchase price, net of cash acquired				$ 77,092

DISPOSITION OF BUSINESS (Narrat

DISPOSITION OF BUSINESS (Narrative) (Details) - Catalyst Services - Disposal Group, Disposed of by Sale, Not Discontinued Operations - USD ($) $ in Millions	Sep. 01, 2016	Sep. 30, 2016	Sep. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale	$ 50.1
Proceeds from sale, net of cash divested	48.6
Gain on sale		$ 16.4	$ 16.4
Transaction costs	$ 1.5	$ 1.5	$ 1.5

DISPOSITION OF BUSINESS (Carryi

DISPOSITION OF BUSINESS (Carrying Amount of Catalyst) (Details) - Catalyst Services - Disposal Group, Disposed of by Sale, Not Discontinued Operations $ in Thousands	Sep. 01, 2016USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total current assets	$ 19,135
Property, plant and equipment, net	11,126
Total other assets	6,500
Total assets divested	36,761
Total current liabilities	4,040
Total other liabilities	566
Total liabilities divested	4,606
Net carrying value divested	$ 32,155

DISPOSITION OF BUSINESS (Income

DISPOSITION OF BUSINESS (Income (Loss) Attributable to Catalyst Services) (Details) - USD ($) $ in Thousands	2 Months Ended	3 Months Ended	8 Months Ended	9 Months Ended
	Sep. 01, 2016	Sep. 30, 2015	Sep. 01, 2016	Sep. 30, 2015
Catalyst Services | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
(Loss) income before provision for income taxes	$ (1,218)	$ 1,089	$ 290	$ 2,489

INVENTORIES AND SUPPLIES (Detai

INVENTORIES AND SUPPLIES (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Inventory Disclosure [Abstract]
Oil and oil products	$ 57,403	$ 33,603
Supplies and drums	84,133	78,132
Solvent and solutions	8,502	8,868
Modular camp accommodations	15,492	15,126
Other	11,758	13,792
Total inventories and supplies	$ 177,288	$ 149,521

PROPERTY, PLANT AND EQUIPMENT50

PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	$ 2,970,084		$ 2,970,084		$ 2,691,738
Less - accumulated depreciation and amortization	1,321,513		1,321,513		1,159,271
Total property, plant and equipment, net	1,648,571		1,648,571		1,532,467
Interest costs capitalized adjustment	1,500	$ 600	4,000	$ 1,200
Depreciation inclusive of amortization	62,600	$ 59,200	185,400	$ 175,500
Land
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	122,337		122,337		100,582
Asset retirement costs (non-landfill)
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	14,590		14,590		12,434
Landfill assets
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	142,587		142,587		136,624
Buildings and improvements
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	379,435		379,435		344,209
Camp equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	156,838		156,838		149,361
Vehicles
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	535,804		535,804		500,619
Equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	1,465,378		1,465,378		1,328,915
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	5,546		5,546		5,337
Construction in progress
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	$ 147,569		$ 147,569		$ 113,657

GOODWILL AND OTHER INTANGIBLE51

GOODWILL AND OTHER INTANGIBLE ASSETS (Rollforward of Goodwill) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Goodwill [Roll Forward]
Balance at beginning of year			$ 453,105
Acquired from current period acquisitions			50,067
Measurement period adjustment from prior period acquisitions			2,095
Decrease from disposition of business			(4,994)
Goodwill impairment charge	$ (34,013)	$ 0	(34,013)	$ (31,992)
Foreign currency translation and other			4,373
Balance at end of year	470,633		470,633
Technical Services
Goodwill [Roll Forward]
Balance at beginning of year			49,267
Balance at end of year	57,637		57,637
Industrial and Field Services
Goodwill [Roll Forward]
Balance at beginning of year			105,286
Balance at end of year	106,349		106,349
Kleen Performance Products
Goodwill [Roll Forward]
Balance at beginning of year			49,755
Balance at end of year	68,482		68,482
SK Environmental Services
Goodwill [Roll Forward]
Balance at beginning of year			216,589
Balance at end of year	238,165		238,165
Lodging Services
Goodwill [Roll Forward]
Balance at beginning of year			32,208
Goodwill impairment charge	(34,000)
Balance at end of year	0		0
Oil and Gas Field Services
Goodwill [Roll Forward]
Balance at beginning of year			0
Balance at end of year	0		0
Operating Segments | Technical Services
Goodwill [Roll Forward]
Balance at beginning of year			49,267
Acquired from current period acquisitions			8,989
Measurement period adjustment from prior period acquisitions			0
Decrease from disposition of business			0
Goodwill impairment charge
Foreign currency translation and other			(619)
Balance at end of year	57,637		57,637
Operating Segments | Industrial and Field Services
Goodwill [Roll Forward]
Balance at beginning of year			105,286
Acquired from current period acquisitions			4,925
Measurement period adjustment from prior period acquisitions			0
Decrease from disposition of business			(4,994)
Goodwill impairment charge
Foreign currency translation and other			1,132
Balance at end of year	106,349		106,349
Operating Segments | Kleen Performance Products
Goodwill [Roll Forward]
Balance at beginning of year			49,755
Acquired from current period acquisitions			18,629
Measurement period adjustment from prior period acquisitions			0
Decrease from disposition of business			0
Goodwill impairment charge
Foreign currency translation and other			98
Balance at end of year	68,482		68,482
Operating Segments | SK Environmental Services
Goodwill [Roll Forward]
Balance at beginning of year			216,589
Acquired from current period acquisitions			17,524
Measurement period adjustment from prior period acquisitions			2,095
Decrease from disposition of business
Goodwill impairment charge
Foreign currency translation and other			1,957
Balance at end of year	238,165		238,165
Operating Segments | Lodging Services
Goodwill [Roll Forward]
Balance at beginning of year			32,208
Acquired from current period acquisitions			0
Measurement period adjustment from prior period acquisitions			0
Decrease from disposition of business
Goodwill impairment charge			(34,013)
Foreign currency translation and other			1,805
Balance at end of year	0		0
Operating Segments | Oil and Gas Field Services
Goodwill [Roll Forward]
Balance at beginning of year			0
Acquired from current period acquisitions			0
Measurement period adjustment from prior period acquisitions			0
Decrease from disposition of business
Goodwill impairment charge
Foreign currency translation and other			0
Balance at end of year	$ 0		$ 0

GOODWILL AND OTHER INTANGIBLE52

GOODWILL AND OTHER INTANGIBLE ASSETS (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Segment Reporting Information [Line Items]
Goodwill impairment charge	$ 34,013	$ 0	$ 34,013	$ 31,992
Goodwill	470,633		470,633		$ 453,105
Property, plant and equipment, net	1,648,571		1,648,571		1,532,467
Intangible assets	507,337		507,337		506,818
Amortization of permits and other intangible assets	10,800	$ 9,900	30,300	$ 29,700
Lodging Services
Segment Reporting Information [Line Items]
Goodwill	34,000		34,000
Fair value of goodwill	0		0
Goodwill impairment charge	34,000
Goodwill	0		0		32,208
Property, plant and equipment, net	99,764		99,764		105,208
Intangible assets	5,951		5,951		7,045
Industrial and Field Services
Segment Reporting Information [Line Items]
Goodwill	106,349		106,349		105,286
Property, plant and equipment, net	211,712		211,712		237,660
Intangible assets	11,490		11,490		$ 14,649
Industrial and Field Services | Industrial Services
Segment Reporting Information [Line Items]
Goodwill	$ 25,100		$ 25,100

GOODWILL AND OTHER INTANGIBLE53

GOODWILL AND OTHER INTANGIBLE ASSETS (Amortizable Other Intangible Assets) (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Cost	$ 599,462	$ 567,678
Accumulated Amortization	214,980	183,186
Net	$ 384,482	$ 384,492
Weighted Average Remaining Amortization Period (in years)	14 years 5 months	10 years
Total permits and other intangible assets, Cost	$ 722,317	$ 690,004
Total permits and other intangible assets, Net	507,337	506,818
Trademarks and trade names
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Trademarks and trade names	122,855	122,326
Permits
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Cost	170,194	161,396
Accumulated Amortization	66,510	61,142
Net	$ 103,684	$ 100,254
Weighted Average Remaining Amortization Period (in years)	20 years 3 months	19 years
Customer and supplier relationships
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Cost	$ 389,002	$ 374,866
Accumulated Amortization	120,922	99,463
Net	$ 268,080	$ 275,403
Weighted Average Remaining Amortization Period (in years)	12 years 6 months	10 years 30 days
Other intangible assets
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Cost	$ 40,266	$ 31,416
Accumulated Amortization	27,548	22,581
Net	$ 12,718	$ 8,835
Weighted Average Remaining Amortization Period (in years)	7 years 9 months 3 days	1 year 6 months

GOODWILL AND OTHER INTANGIBLE54

GOODWILL AND OTHER INTANGIBLE ASSETS (Expected Future Amortization) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
2016 (three months)	$ 9,533
2,017	35,325
2,018	32,345
2,019	29,612
2,020	27,316
Thereafter	250,351
Net	$ 384,482	$ 384,492

ACCRUED EXPENSES (Details)

ACCRUED EXPENSES (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Payables and Accruals [Abstract]
Insurance	$ 59,254	$ 55,899
Interest	21,859	20,500
Accrued compensation and benefits	46,921	35,646
Income, real estate, sales and other taxes	60,020	37,095
Other	38,026	44,520
Total accrued expenses	$ 226,080	$ 193,660

CLOSURE AND POST-CLOSURE LIAB56

CLOSURE AND POST-CLOSURE LIABILITIES (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2016USD ($)
Changes to post-closure liabilities
Beginning balance	$ 56,249
Liabilities assumed in acquisitions	2,408
Adjustments during the measurement period related to 2015 acquisitions	657
New asset retirement obligations	1,650
Accretion	3,744
Changes in estimates recorded to statement of operations	(711)
Expenditures	(1,613)
Currency translation and other	183
Ending balance	$ 62,567
Credit-adjusted risk-free rate	6.23%
Landfill Retirement Liability
Changes to post-closure liabilities
Beginning balance	$ 32,023
Liabilities assumed in acquisitions	0
Adjustments during the measurement period related to 2015 acquisitions	0
New asset retirement obligations	1,650
Accretion	1,996
Changes in estimates recorded to statement of operations	(597)
Expenditures	(904)
Currency translation and other	130
Ending balance	34,298
Non-Landfill Retirement Liability
Changes to post-closure liabilities
Beginning balance	24,226
Liabilities assumed in acquisitions	2,408
Adjustments during the measurement period related to 2015 acquisitions	657
New asset retirement obligations	0
Accretion	1,748
Changes in estimates recorded to statement of operations	(114)
Expenditures	(709)
Currency translation and other	53
Ending balance	$ 28,269

REMEDIAL LIABILITIES (Details)

REMEDIAL LIABILITIES (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2016USD ($)
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at beginning of year	$ 131,992
Liabilities assumed in acquisition	4
Accretion	3,785
Changes in estimates recorded to statement of operations	362
Expenditures	(7,761)
Currency translation and other	699
Balance at end of year	129,081
Remedial Liabilities for Landfill Sites
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at beginning of year	2,327
Liabilities assumed in acquisition	0
Accretion	82
Changes in estimates recorded to statement of operations	71
Expenditures	(88)
Currency translation and other	0
Balance at end of year	2,392
Remedial Liabilities for Inactive Sites
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at beginning of year	63,613
Liabilities assumed in acquisition	0
Accretion	2,049
Changes in estimates recorded to statement of operations	(448)
Expenditures	(2,957)
Currency translation and other	45
Balance at end of year	62,302
Remedial Liabilities (Including Superfund) for Non-Landfill Operations
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at beginning of year	66,052
Liabilities assumed in acquisition	4
Accretion	1,654
Changes in estimates recorded to statement of operations	739
Expenditures	(4,716)
Currency translation and other	654
Balance at end of year	$ 64,387

FINANCING ARRANGEMENTS (Details

FINANCING ARRANGEMENTS (Details) - USD ($)	9 Months Ended
	Sep. 30, 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	(12,423,000)		(12,457,000)
Long-term obligations, at carrying value	1,632,577,000		1,382,543,000
Revolving credit facility, amount outstanding	0		0
Line of credit facility available borrowing capacity	201,400,000		178,500,000
Letters of credit amount outstanding	$ 142,000,000		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 | Senior unsecured notes, at 5.25%, due August 1, 2020 (2020 Notes)
Financing arrangements
Long-term obligations, at par	$ 800,000,000		$ 800,000,000
Stated interest rate	5.25%		5.25%
Fair value	$ 824,000,000		$ 812,000,000
Unsecured debt | Senior unsecured notes, at 5.125%, due June 1, 2021 (2021 Notes)
Financing arrangements
Long-term obligations, at par	$ 845,000,000		$ 595,000,000
Stated interest rate	5.125%		5.125%
Fair value	$ 866,100,000		$ 599,500,000
Issuance of debt	$ 250,000,000	$ 250,000,000		$ 600,000,000

(LOSS) EARNINGS PER SHARE (Comp

(LOSS) EARNINGS PER SHARE (Computation of Basic and Diluted Earnings Per Share)(Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Numerator for basic and diluted (loss) earnings per share:
Net (loss) income	$ (10,255)	$ 40,228	$ (27,160)	$ 43,534
Denominator:
Basic shares outstanding (in shares)	57,487	58,161	57,575	58,799
Dilutive effect of equity-based compensation awards (in shares)	0	107	0	99
Dilutive shares outstanding (in shares)	57,487	58,268	57,575	58,898
Basic earnings (loss) per share (in USD per share)	$ (0.18)	$ 0.69	$ (0.47)	$ 0.74
Diluted earnings (loss) per share (in USD per share)	$ (0.18)	$ 0.69	$ (0.47)	$ 0.74

(LOSS) EARNINGS PER SHARE (Narr

(LOSS) EARNINGS PER SHARE (Narrative) (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Performance stock awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from computation of earning per share (in shares)		274,257		274,257
Restricted Stock Awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from computation of earning per share (in shares)		10,704		42,642
Stock Options, Restricted Stock Awards, and Performance Awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from computation of earning per share (in shares)	835,482		835,482

ACCUMULATED OTHER COMPREHENSI61

ACCUMULATED OTHER COMPREHENSIVE LOSS (Changes in Accumulated Other Comprehensive Loss by Component) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Components of Other Accumulated Income, Net of Tax [Roll Forward]
Balance at beginning of period			$ 1,096,282
Other comprehensive income (loss) before reclassifications			43,110
Tax effects			(238)
Other comprehensive income	$ (1,311)	$ (53,541)	43,348	$ (118,713)
Balance at end of period	1,100,945		1,100,945
Foreign Currency Translation
Components of Other Accumulated Income, Net of Tax [Roll Forward]
Balance at beginning of period			(252,939)
Other comprehensive income (loss) before reclassifications			43,706
Tax effects			0
Other comprehensive income			43,706
Balance at end of period	(209,233)		(209,233)
Unrealized Gains on Available-For-Sale Securities
Components of Other Accumulated Income, Net of Tax [Roll Forward]
Balance at beginning of period			0
Other comprehensive income (loss) before reclassifications			(596)
Tax effects			(238)
Other comprehensive income			(358)
Balance at end of period	(358)		(358)
Unfunded Pension Liability
Components of Other Accumulated Income, Net of Tax [Roll Forward]
Balance at beginning of period			(1,953)
Other comprehensive income (loss) before reclassifications			0
Tax effects			0
Other comprehensive income			0
Balance at end of period	(1,953)		(1,953)
Total
Components of Other Accumulated Income, Net of Tax [Roll Forward]
Balance at beginning of period			(254,892)
Other comprehensive income			43,348
Balance at end of period	$ (211,544)		$ (211,544)

ACCUMULATED OTHER COMPREHENSI62

ACCUMULATED OTHER COMPREHENSIVE LOSS (Amount Reclassified Out of Accumulated Other Comprehensive Loss) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Equity [Abstract]
Reclassifications out of accumulated other comprehensive income	$ 0	$ 0	$ 0	$ 0

STOCK-BASED COMPENSATION (Narra

STOCK-BASED COMPENSATION (Narrative) (Details) - USD ($) shares in Millions	3 Months Ended		9 Months Ended		19 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Mar. 13, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	$ 3,000,000	$ 500,000	$ 7,700,000	$ 6,600,000
Income tax benefit	$ 900,000	$ 100,000	$ 2,300,000	$ 1,800,000
Share repurchase program authorized						$ 300,000,000
Repurchases of common stock (in shares)	0.1	0.8	0.3	1.3	3.7
Repurchases of common stock	$ 6,200,000	$ 37,600,000	$ 16,348,000	$ 69,800,000	$ 194,000,000
Stock repurchase program, remaining authorized repurchase amount	106,000,000		106,000,000		106,000,000
Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	17,200,000		$ 17,200,000		17,200,000
Period for recognition			3 years
Fair value restricted stock	1,800,000	600,000	$ 7,900,000	6,800,000
Performance stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	200,000		200,000		$ 200,000
Fair value restricted stock	0	$ 0	$ 400,000	$ 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
Reversal of previous expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	$ (1,400,000)

STOCK-BASED COMPENSATION (Restr

STOCK-BASED COMPENSATION (Restricted Stock) (Details) - Restricted stock awards	9 Months Ended
	Sep. 30, 2016$ / sharesshares
Number of Shares
Beginning balance (in shares) | shares	362,618
Granted (in shares) | shares	335,992
Vested (in shares) | shares	(168,565)
Forfeited (in shares) | shares	(46,298)
Ending balance (in shares) | shares	483,747
Weighted Average Grant-Date Fair Value
Beginning of period (in USD per share) | $ / shares	$ 55.79
Granted (in USD per share) | $ / shares	50.87
Vested (in USD per share) | $ / shares	54.06
Forfeited (in USD per share) | $ / shares	53.04
End of period (in USD per share) | $ / shares	$ 53.23

STOCK-BASED COMPENSATION (Perfo

STOCK-BASED COMPENSATION (Performance Stock Awards (Details) - Performance stock awards	9 Months Ended
	Sep. 30, 2016$ / sharesshares
Number of Shares
Beginning balance (in shares) | shares	187,274
Granted (in shares) | shares	207,624
Vested (in shares) | shares	(8,420)
Forfeited (in shares) | shares	(33,469)
Ending balance (in shares) | shares	353,009
Weighted Average Grant-Date Fair Value
Beginning of period (in USD per share) | $ / shares	$ 57.13
Granted (in USD per share) | $ / shares	54.21
Vested (in USD per share) | $ / shares	61.90
Forfeited (in USD per share) | $ / shares	55.96
End of period (in USD per share) | $ / shares	$ 55.39

COMMITMENTS AND CONTINGENCIES (

COMMITMENTS AND CONTINGENCIES (Details) CAD in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2016USD ($)sitefacilityproceedingclaim	Dec. 31, 2012CAD	Dec. 31, 1999municipality	Dec. 31, 1968permit	Dec. 31, 2015USD ($)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 use of Safety-Kleen's products | proceeding	62
Number of product liability claims settled or dismissed | claim	18
Legal and Administrative Proceedings
Contingencies [Line Items]
Recorded reserves for actual or probable liabilities | $	$ 18,300,000				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	3
Notices received from owners of third party sites seeking indemnification from the company	126
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	77
Number of sites which potential liability could exceed $100,000	11
Notices received from owners of third party sites seeking indemnification from the company	17
Superfund Proceedings | Minimum
Contingencies [Line Items]
Minimum potential liability | $	$ 100,000
ChemWaste
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	6
Federal and State Enforcement Actions
Contingencies [Line Items]
Recorded reserves for actual or probable liabilities | $	$ 2,600,000				$ 3,000,000
Number of pending personal injury claims allegedly resulting from the use 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		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Effective income tax rate	47.80%	46.20%	80.30%	44.40%
Unrecognized tax benefits	$ 1.8		$ 1.8		$ 2.1
Interest on unrecognized tax benefits	$ 0.3		$ 0.3		$ 0.4

SEGMENT REPORTING (Narrative) (

SEGMENT REPORTING (Narrative) (Details)	9 Months Ended
	Sep. 30, 2016segment
Segment Reporting [Abstract]
Number of reportable segments	6

SEGMENT REPORTING (Third Party

SEGMENT REPORTING (Third Party Revenues to Direct Revenues) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting Information [Line Items]
Total revenues	$ 729,520	$ 893,366	$ 2,063,113	$ 2,562,093
Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	0	0	0	0
Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	0	0	0	0
Direct revenues
Segment Reporting Information [Line Items]
Total revenues	729,520	893,366	2,063,113	2,562,093
Technical Services
Segment Reporting Information [Line Items]
Total revenues	232,482	253,069	680,717	741,419
Technical Services | Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	38,795	34,819	109,217	108,037
Technical Services | Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	492	506	1,547	2,886
Technical Services | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	271,769	288,394	791,481	852,342
Industrial and Field Services
Segment Reporting Information [Line Items]
Total revenues	162,118	307,226	437,546	807,423
Industrial and Field Services | Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	(12,734)	(6,973)	(29,255)	(24,764)
Industrial and Field Services | Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	(32)	(313)	(335)	(636)
Industrial and Field Services | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	149,352	299,940	407,956	782,023
Kleen Performance Products
Segment Reporting Information [Line Items]
Total revenues	102,318	100,827	256,572	296,738
Kleen Performance Products | Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	(9,761)	(23,744)	(26,768)	(63,429)
Kleen Performance Products | Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	0	(6)	(1)	(8)
Kleen Performance Products | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	92,557	77,077	229,803	233,301
SK Environmental Services
Segment Reporting Information [Line Items]
Total revenues	194,764	171,832	565,186	508,392
SK Environmental Services | Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	(18,955)	(5,947)	(59,561)	(26,331)
SK Environmental Services | Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	1	2	369	5
SK Environmental Services | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	175,810	165,887	505,994	482,066
Lodging Services
Segment Reporting Information [Line Items]
Total revenues	15,520	13,507	47,583	68,782
Lodging Services | Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	233	743	634	1,899
Lodging Services | Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	19	30	54	127
Lodging Services | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	15,772	14,280	48,271	70,808
Oil and Gas Field Services
Segment Reporting Information [Line Items]
Total revenues	22,197	46,788	73,445	138,992
Oil and Gas Field Services | Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	2,422	1,102	5,733	4,588
Oil and Gas Field Services | Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	86	92	221	141
Oil and Gas Field Services | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	24,705	47,982	79,399	143,721
Corporate Items
Segment Reporting Information [Line Items]
Total revenues	121	117	2,064	347
Corporate Items | Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	0	0	0	0
Corporate Items | Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	(566)	(311)	(1,855)	(2,515)
Corporate Items | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	$ (445)	$ (194)	$ 209	$ (2,168)

SEGMENT REPORTING (Adjusted EBI

SEGMENT REPORTING (Adjusted EBITDA Information) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting Information [Line Items]
Adjusted EBITDA	$ 126,651	$ 165,607	$ 304,416	$ 407,006
Reconciliation to Consolidated Statements of Operations:
Accretion of environmental liabilities	2,476	2,577	7,529	7,795
Depreciation and amortization	73,360	69,060	215,655	205,189
Goodwill impairment charge	34,013	0	34,013	31,992
Income (loss) from operations	16,802	93,970	47,219	162,030
Other expense	198	139	737	390
Gain on sale of business	(16,431)	0	(16,431)	0
Interest expense, net of interest income	21,565	19,017	62,192	57,704
(Loss) income before (benefit) provision for income taxes	11,470	74,814	721	103,936
Technical Services
Segment Reporting Information [Line Items]
Adjusted EBITDA	72,333	79,048	201,622	219,257
Industrial and Field Services
Segment Reporting Information [Line Items]
Adjusted EBITDA	18,579	62,460	40,643	145,850
Kleen Performance Products
Segment Reporting Information [Line Items]
Adjusted EBITDA	22,803	12,123	37,358	23,471
SK Environmental Services
Segment Reporting Information [Line Items]
Adjusted EBITDA	47,250	40,096	127,984	108,540
Lodging Services
Segment Reporting Information [Line Items]
Adjusted EBITDA	4,104	1,827	8,145	12,589
Reconciliation to Consolidated Statements of Operations:
Goodwill impairment charge	34,000
Oil and Gas Field Services
Segment Reporting Information [Line Items]
Adjusted EBITDA	(4,425)	1,579	(10,026)	800
Corporate Items
Segment Reporting Information [Line Items]
Adjusted EBITDA	$ (33,993)	$ (31,526)	$ (101,310)	$ (103,501)

SEGMENT REPORTING (Assets by Re

SEGMENT REPORTING (Assets by Reportable Segment) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Property, plant and equipment, net	$ 1,648,571	$ 1,532,467
Goodwill	470,633	453,105
Permits and other intangibles, net	507,337	506,818
Total assets	3,712,613	3,431,428
Technical Services
Segment Reporting Information [Line Items]
Property, plant and equipment, net	521,040	483,425
Goodwill	57,637	49,267
Permits and other intangibles, net	74,646	73,601
Total assets	859,794	800,060
Industrial and Field Services
Segment Reporting Information [Line Items]
Property, plant and equipment, net	211,712	237,660
Goodwill	106,349	105,286
Permits and other intangibles, net	11,490	14,649
Total assets	366,929	368,858
Kleen Performance Products
Segment Reporting Information [Line Items]
Property, plant and equipment, net	260,608	193,855
Goodwill	68,482	49,755
Permits and other intangibles, net	141,039	140,410
Total assets	605,160	492,483
SK Environmental Services
Segment Reporting Information [Line Items]
Property, plant and equipment, net	328,655	264,539
Goodwill	238,165	216,589
Permits and other intangibles, net	264,864	256,251
Total assets	920,333	805,488
Lodging Services
Segment Reporting Information [Line Items]
Property, plant and equipment, net	99,764	105,208
Goodwill	0	32,208
Permits and other intangibles, net	5,951	7,045
Total assets	142,948	181,357
Oil and Gas Field Services
Segment Reporting Information [Line Items]
Property, plant and equipment, net	139,137	156,286
Goodwill	0	0
Permits and other intangibles, net	9,347	14,862
Total assets	229,480	244,210
Corporate Items
Segment Reporting Information [Line Items]
Property, plant and equipment, net	87,655	91,494
Goodwill	0	0
Permits and other intangibles, net	0	0
Total assets	$ 587,969	$ 538,972

SEGMENT REPORTING (Total Assets

SEGMENT REPORTING (Total Assets by Geographical Area) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Total assets	$ 3,712,613	$ 3,431,428
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total assets	2,944,936	2,575,746
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Total assets	767,677	851,949
Other foreign
Revenues from External Customers and Long-Lived Assets [Line Items]
Total assets	$ 0	$ 3,733

GUARANTOR AND NON-GUARANTOR S73

GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION (Narrative) (Details) - USD ($)	9 Months Ended
	Sep. 30, 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%
Senior unsecured notes, at 5.125%, due June 1, 2021 (2021 Notes) | Unsecured debt
Debt Instrument [Line Items]
Issuance of debt	$ 250,000,000	$ 250,000,000	$ 600,000,000

GUARANTOR AND NON-GUARANTOR S74

GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION (Condensed Consolidating Balance Sheets) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2014
ASSETS
Cash and cash equivalents	$ 257,857	$ 184,708	$ 179,191	$ 246,879
Intercompany receivables	0	0
Accounts receivable, net	512,376	496,004
Other current assets	279,698	240,484
Property, plant and equipment, net	1,648,571	1,532,467
Investments in subsidiaries	0	0
Intercompany debt receivable	0	0
Goodwill	470,633	453,105
Permits and other intangibles, net	507,337	506,818
Other long-term assets	36,141	17,842
Total assets	3,712,613	3,431,428
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities	539,096	517,120
Intercompany payables	0	0
Closure, post-closure and remedial liabilities, net	171,431	167,846
Long-term obligations	1,632,577	1,382,543
Intercompany debt payable	0	0
Other long-term liabilities	268,564	267,637
Total liabilities	2,611,668	2,335,146
Stockholders’ equity	1,100,945	1,096,282
Total liabilities and stockholders’ equity	3,712,613	3,431,428
Reportable Legal Entities | Clean Harbors, Inc.
ASSETS
Cash and cash equivalents	51,334	11,017	11,008	1,006
Intercompany receivables	190,728	164,709
Accounts receivable, net	0	0
Other current assets	2,537	0
Property, plant and equipment, net	0	0
Investments in subsidiaries	2,813,894	2,547,307
Intercompany debt receivable	0	0
Goodwill	0	0
Permits and other intangibles, net	0	0
Other long-term assets	1,197	1,068
Total assets	3,059,690	2,724,101
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities	22,619	20,813
Intercompany payables	299,848	220,762
Closure, post-closure and remedial liabilities, net	0	0
Long-term obligations	1,632,577	1,382,543
Intercompany debt payable	3,701	3,701
Other long-term liabilities	0	0
Total liabilities	1,958,745	1,627,819
Stockholders’ equity	1,100,945	1,096,282
Total liabilities and stockholders’ equity	3,059,690	2,724,101
Reportable Legal Entities | U.S. Guarantor Subsidiaries
ASSETS
Cash and cash equivalents	170,183	83,479	66,074	154,147
Intercompany receivables	300,656	213,243
Accounts receivable, net	418,170	404,580
Other current assets	207,488	179,969
Property, plant and equipment, net	1,217,704	1,082,466
Investments in subsidiaries	488,437	522,067
Intercompany debt receivable	212,171	260,957
Goodwill	417,992	367,306
Permits and other intangibles, net	439,543	435,080
Other long-term assets	9,552	10,274
Total assets	3,881,896	3,559,421
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities	438,298	424,588
Intercompany payables	224,593	195,287
Closure, post-closure and remedial liabilities, net	155,710	153,190
Long-term obligations	0	0
Intercompany debt payable	0	0
Other long-term liabilities	249,401	239,049
Total liabilities	1,068,002	1,012,114
Stockholders’ equity	2,813,894	2,547,307
Total liabilities and stockholders’ equity	3,881,896	3,559,421
Reportable Legal Entities | Foreign Non-Guarantor Subsidiaries
ASSETS
Cash and cash equivalents	36,340	90,212	102,109	91,726
Intercompany receivables	34,665	39,804
Accounts receivable, net	94,206	91,424
Other current assets	69,673	60,515
Property, plant and equipment, net	430,867	450,001
Investments in subsidiaries	0	0
Intercompany debt receivable	3,701	3,701
Goodwill	52,641	85,799
Permits and other intangibles, net	67,794	71,738
Other long-term assets	25,392	6,500
Total assets	815,279	899,694
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities	78,179	71,719
Intercompany payables	1,608	1,707
Closure, post-closure and remedial liabilities, net	15,721	14,656
Long-term obligations	0	0
Intercompany debt payable	212,171	260,957
Other long-term liabilities	19,163	28,588
Total liabilities	326,842	377,627
Stockholders’ equity	488,437	522,067
Total liabilities and stockholders’ equity	815,279	899,694
Consolidating Adjustments
ASSETS
Cash and cash equivalents	0	0	$ 0	$ 0
Intercompany receivables	(526,049)	(417,756)
Accounts receivable, net	0	0
Other current assets	0	0
Property, plant and equipment, net	0	0
Investments in subsidiaries	(3,302,331)	(3,069,374)
Intercompany debt receivable	(215,872)	(264,658)
Goodwill	0	0
Permits and other intangibles, net	0	0
Other long-term assets	0	0
Total assets	(4,044,252)	(3,751,788)
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities	0	0
Intercompany payables	(526,049)	(417,756)
Closure, post-closure and remedial liabilities, net	0	0
Long-term obligations	0	0
Intercompany debt payable	(215,872)	(264,658)
Other long-term liabilities	0	0
Total liabilities	(741,921)	(682,414)
Stockholders’ equity	(3,302,331)	(3,069,374)
Total liabilities and stockholders’ equity	$ (4,044,252)	$ (3,751,788)

GUARANTOR AND NON-GUARANTOR S75

GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION (Consolidating Statement of Operations) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Revenues:
Service revenues	$ 594,225	$ 760,667	$ 1,709,018	$ 2,158,344
Product revenues	135,295	132,699	354,095	403,749
Total revenues	729,520	893,366	2,063,113	2,562,093
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	385,542	523,676	1,148,212	1,484,936
Product cost of revenues	106,373	110,970	287,984	348,905
Total cost of revenues	491,915	634,646	1,436,196	1,833,841
Selling, general and administrative expenses	110,954	93,113	322,501	321,246
Accretion of environmental liabilities	2,476	2,577	7,529	7,795
Depreciation and amortization	73,360	69,060	215,655	205,189
Goodwill impairment charge	34,013	0	34,013	31,992
Income (loss) from operations	16,802	93,970	47,219	162,030
Other income (expense)	(198)	(139)	(737)	(390)
Gain on sale of business	16,431	0	16,431	0
Interest (expense) income	(21,565)	(19,017)	(62,192)	(57,704)
Equity in earnings of subsidiaries, net of taxes	0	0	0	0
Intercompany interest income (expense)	0	0	0	0
(Loss) income before (benefit) provision for income taxes	11,470	74,814	721	103,936
(Benefit) provision for income taxes	21,725	34,586	27,881	60,402
Net (loss) income	(10,255)	40,228	(27,160)	43,534
Other comprehensive (loss) income	(1,311)	(53,541)	43,348	(118,713)
Comprehensive (loss) income	(11,566)	(13,313)	16,188	(75,179)
Reportable Legal Entities | Clean Harbors, Inc.
Revenues:
Service revenues	0	0	0	0
Product revenues	0	0	0	0
Total revenues	0	0	0	0
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	(598)	0	(1,185)	0
Product cost of revenues	0	0	0	0
Total cost of revenues	(598)	0	(1,185)	0
Selling, general and administrative expenses	23	25	84	75
Accretion of environmental liabilities	0	0	0	0
Depreciation and amortization	0	0	0	0
Goodwill impairment charge	0		0	0
Income (loss) from operations	575	(25)	1,101	(75)
Other income (expense)	0	0	0	0
Gain on sale of business	0		0
Interest (expense) income	(23,042)	(19,671)	(66,147)	(58,962)
Equity in earnings of subsidiaries, net of taxes	3,225	52,046	11,867	78,956
Intercompany interest income (expense)	0	0	0	0
(Loss) income before (benefit) provision for income taxes	(19,242)	32,350	(53,179)	19,919
(Benefit) provision for income taxes	(8,987)	(7,878)	(26,019)	(23,615)
Net (loss) income	(10,255)	40,228	(27,160)	43,534
Other comprehensive (loss) income	(1,311)	(53,541)	43,348	(118,713)
Comprehensive (loss) income	(11,566)	(13,313)	16,188	(75,179)
Reportable Legal Entities | U.S. Guarantor Subsidiaries
Revenues:
Service revenues	461,139	612,814	1,345,629	1,659,739
Product revenues	118,106	117,653	303,342	349,524
Total revenues	579,245	730,467	1,648,971	2,009,263
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	288,764	413,878	864,071	1,106,591
Product cost of revenues	94,050	101,778	252,512	315,322
Total cost of revenues	382,814	515,656	1,116,583	1,421,913
Selling, general and administrative expenses	88,652	72,811	253,189	247,472
Accretion of environmental liabilities	2,243	2,277	6,846	6,870
Depreciation and amortization	51,957	46,951	151,348	137,354
Goodwill impairment charge	0		0	4,164
Income (loss) from operations	53,579	92,772	121,005	191,490
Other income (expense)	(188)	204	124	483
Gain on sale of business	1,288		1,288
Interest (expense) income	1,456	613	3,851	1,115
Equity in earnings of subsidiaries, net of taxes	(22,341)	(2,341)	(58,031)	(38,920)
Intercompany interest income (expense)	5,235	5,666	15,891	17,679
(Loss) income before (benefit) provision for income taxes	39,029	96,914	84,128	171,847
(Benefit) provision for income taxes	35,803	44,868	72,260	92,891
Net (loss) income	3,226	52,046	11,868	78,956
Other comprehensive (loss) income	(1,311)	(53,541)	43,348	(118,713)
Comprehensive (loss) income	1,915	(1,495)	55,216	(39,757)
Reportable Legal Entities | Foreign Non-Guarantor Subsidiaries
Revenues:
Service revenues	145,780	162,680	399,216	546,790
Product revenues	20,072	17,591	58,176	63,239
Total revenues	165,852	180,271	457,392	610,029
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	110,070	124,625	321,153	426,530
Product cost of revenues	15,206	11,737	42,895	42,597
Total cost of revenues	125,276	136,362	364,048	469,127
Selling, general and administrative expenses	22,279	20,277	69,228	73,699
Accretion of environmental liabilities	233	300	683	925
Depreciation and amortization	21,403	22,109	64,307	67,835
Goodwill impairment charge	34,013		34,013	27,828
Income (loss) from operations	(37,352)	1,223	(74,887)	(29,385)
Other income (expense)	(10)	(343)	(861)	(873)
Gain on sale of business	15,143		15,143
Interest (expense) income	21	41	104	143
Equity in earnings of subsidiaries, net of taxes	0	0	0	0
Intercompany interest income (expense)	(5,235)	(5,666)	(15,891)	(17,679)
(Loss) income before (benefit) provision for income taxes	(27,433)	(4,745)	(76,392)	(47,794)
(Benefit) provision for income taxes	(5,091)	(2,404)	(18,360)	(8,874)
Net (loss) income	(22,342)	(2,341)	(58,032)	(38,920)
Other comprehensive (loss) income	(3,927)	(34,150)	24,403	(76,752)
Comprehensive (loss) income	(26,269)	(36,491)	(33,629)	(115,672)
Consolidating Adjustments
Revenues:
Service revenues	(12,694)	(14,827)	(35,827)	(48,185)
Product revenues	(2,883)	(2,545)	(7,423)	(9,014)
Total revenues	(15,577)	(17,372)	(43,250)	(57,199)
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	(12,694)	(14,827)	(35,827)	(48,185)
Product cost of revenues	(2,883)	(2,545)	(7,423)	(9,014)
Total cost of revenues	(15,577)	(17,372)	(43,250)	(57,199)
Selling, general and administrative expenses	0	0	0	0
Accretion of environmental liabilities	0	0	0	0
Depreciation and amortization	0	0	0	0
Goodwill impairment charge	0		0	0
Income (loss) from operations	0	0	0	0
Other income (expense)	0	0	0	0
Gain on sale of business	0		0
Interest (expense) income	0	0	0	0
Equity in earnings of subsidiaries, net of taxes	19,116	(49,705)	46,164	(40,036)
Intercompany interest income (expense)	0	0	0	0
(Loss) income before (benefit) provision for income taxes	19,116	(49,705)	46,164	(40,036)
(Benefit) provision for income taxes	0	0	0	0
Net (loss) income	19,116	(49,705)	46,164	(40,036)
Other comprehensive (loss) income	5,238	87,691	(67,751)	195,465
Comprehensive (loss) income	$ 24,354	$ 37,986	$ (21,587)	$ 155,429

GUARANTOR AND NON-GUARANTOR S76

GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION (Condensed Consolidating Statements of Cash Flows) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Condensed consolidating statement of cash flows
Net cash from (used in) operating activities	$ 178,827	$ 309,593
Cash flows used in investing activities:
Additions to property, plant and equipment	(175,348)	(189,999)
Proceeds from sales of fixed assets	3,982	3,740
Acquisitions, net of cash acquired	(207,089)	(79,610)
Proceeds on sale of business, net of cash	47,134	0
Costs to obtain or renew permits	(1,920)	(4,633)
Purchases of available-for-sale securities	(598)	0
Investment in subsidiaries	0
Intercompany	0	0
Net cash used in investing activities	(333,839)	(270,502)
Cash flows from (used in) financing activities:
Change in uncashed checks	(7,084)	(21,882)
Exercise of stock options	230	397
Issuance of restricted shares, net of shares remitted	(2,500)	(2,027)
Repurchases of common stock	(15,869)	(69,155)
Excess tax benefit of stock-based compensation	21	102
Deferred financing costs paid	(2,614)	0
Payments of capital leases	0	(500)
Issuance of senior secured notes, including premium	250,625
Intercompany	0	0
Intercompany debt	0
Net cash from (used in) financing activities	222,809	(93,065)
Effect of exchange rate change on cash	5,352	(13,714)
Increase (decrease) in cash and cash equivalents	73,149	(67,688)
Cash and cash equivalents, beginning of period	184,708	246,879
Cash and cash equivalents, end of period	257,857	179,191
Consolidating Adjustments
Condensed consolidating statement of cash flows
Net cash from (used in) operating activities	0	0
Cash flows 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	0
Proceeds on sale of business, net of cash	0
Costs to obtain or renew permits	0	0
Purchases of available-for-sale securities	0
Investment in subsidiaries	250,625
Intercompany	18,118	71,182
Net cash used in investing activities	268,743	71,182
Cash flows from (used in) financing activities:
Change in uncashed checks	0	0
Exercise of stock options	0	0
Issuance of restricted shares, net of shares remitted	0	0
Repurchases of common stock	0	0
Excess tax benefit of stock-based compensation	0	0
Deferred financing costs paid	0
Payments of capital leases		0
Issuance of senior secured notes, including premium	(250,625)
Intercompany	(18,118)	(71,182)
Intercompany debt	0
Net cash from (used in) financing activities	(268,743)	(71,182)
Effect of exchange rate change on cash	0	0
Increase (decrease) in cash and cash equivalents	0	0
Cash and cash equivalents, beginning of period	0	0
Cash and cash equivalents, end of period	0	0
Clean Harbors, Inc. | Reportable Legal Entities
Condensed consolidating statement of cash flows
Net cash from (used in) operating activities	43,033	9,503
Cash flows 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	0
Proceeds on sale of business, net of cash	0
Costs to obtain or renew permits	0	0
Purchases of available-for-sale securities	(102)
Investment in subsidiaries	(250,625)
Intercompany	0	0
Net cash used in investing activities	(250,727)	0
Cash flows from (used in) financing activities:
Change in uncashed checks	0	0
Exercise of stock options	230	397
Issuance of restricted shares, net of shares remitted	(2,500)	(2,027)
Repurchases of common stock	(15,869)	(69,155)
Excess tax benefit of stock-based compensation	21	102
Deferred financing costs paid	(2,614)
Payments of capital leases		0
Issuance of senior secured notes, including premium	250,625
Intercompany	18,118	71,182
Intercompany debt	0
Net cash from (used in) financing activities	248,011	499
Effect of exchange rate change on cash	0	0
Increase (decrease) in cash and cash equivalents	40,317	10,002
Cash and cash equivalents, beginning of period	11,017	1,006
Cash and cash equivalents, end of period	51,334	11,008
U.S. Guarantor Subsidiaries | Reportable Legal Entities
Condensed consolidating statement of cash flows
Net cash from (used in) operating activities	128,182	240,713
Cash flows used in investing activities:
Additions to property, plant and equipment	(152,836)	(162,329)
Proceeds from sales of fixed assets	950	1,177
Acquisitions, net of cash acquired	(197,089)	(79,610)
Proceeds on sale of business, net of cash	18,885
Costs to obtain or renew permits	(949)	(4)
Purchases of available-for-sale securities	0
Investment in subsidiaries	0
Intercompany	(18,118)	(71,182)
Net cash used in investing activities	(349,157)	(311,948)
Cash flows from (used in) financing activities:
Change in uncashed checks	(6,064)	(16,635)
Exercise of stock options	0	0
Issuance of restricted shares, net of shares remitted	0	0
Repurchases of common stock	0	0
Excess tax benefit of stock-based compensation	0	0
Deferred financing costs paid	0
Payments of capital leases		(203)
Issuance of senior secured notes, including premium	250,625
Intercompany	0	0
Intercompany debt	63,118
Net cash from (used in) financing activities	307,679	(16,838)
Effect of exchange rate change on cash	0	0
Increase (decrease) in cash and cash equivalents	86,704	(88,073)
Cash and cash equivalents, beginning of period	83,479	154,147
Cash and cash equivalents, end of period	170,183	66,074
Foreign Non-Guarantor Subsidiaries | Reportable Legal Entities
Condensed consolidating statement of cash flows
Net cash from (used in) operating activities	7,612	59,377
Cash flows used in investing activities:
Additions to property, plant and equipment	(22,512)	(27,670)
Proceeds from sales of fixed assets	3,032	2,563
Acquisitions, net of cash acquired	(10,000)	0
Proceeds on sale of business, net of cash	28,249
Costs to obtain or renew permits	(971)	(4,629)
Purchases of available-for-sale securities	(496)
Investment in subsidiaries	0
Intercompany	0	0
Net cash used in investing activities	(2,698)	(29,736)
Cash flows from (used in) financing activities:
Change in uncashed checks	(1,020)	(5,247)
Exercise of stock options	0	0
Issuance of restricted shares, net of shares remitted	0	0
Repurchases of common stock	0	0
Excess tax benefit of stock-based compensation	0	0
Deferred financing costs paid	0
Payments of capital leases		(297)
Issuance of senior secured notes, including premium	0
Intercompany	0	0
Intercompany debt	(63,118)
Net cash from (used in) financing activities	(64,138)	(5,544)
Effect of exchange rate change on cash	5,352	(13,714)
Increase (decrease) in cash and cash equivalents	(53,872)	10,383
Cash and cash equivalents, beginning of period	90,212	91,726
Cash and cash equivalents, end of period	$ 36,340	$ 102,109