10-Q

UNITED STATES OF AMERICA

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

_______________________

FORM 10-Q

x	QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
FOR THE QUARTERLY PERIOD ENDED JUNE 30, 2017
OR
o	TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

FOR THE TRANSITION PERIOD FROM         TO       

Commission File Number 001-34223

_______________________

CLEAN HARBORS, INC.

(Exact name of registrant as specified in its charter)

Massachusetts	04-2997780
(State or Other Jurisdiction of Incorporation or Organization)	(IRS Employer Identification No.)
42 Longwater Drive, Norwell, MA	02061-9149
(Address of Principal Executive Offices)	(Zip Code)

(781) 792-5000

(Registrant’s Telephone Number, Including area code)

_______________________

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports) and (2) has been subject to such filing requirements for the past 90 days. Yes x  No o

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files). Yes  x  No o

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and "emerging growth company" in Rule 12b-2 of the Exchange Act. (Check one):

Large accelerated filer x	Accelerated filer o
Non-accelerated filer o	Smaller reporting company o
(Do not check if a smaller reporting company)	Emerging growth company o

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. o

Indicate by check mark whether the registrant is a shell company (as defined by Rule 12b-2 of the Exchange Act). Yes o  No x

Indicate the number of shares outstanding of each of the issuer’s classes of common stock, as of the latest practicable date.

Common Stock, $.01 par value	57,154,060
(Class)	(Outstanding as of July 28, 2017)

CLEAN HARBORS, INC.

QUARTERLY REPORT ON FORM 10-Q

TABLE OF CONTENTS

	Page No.
PART I: FINANCIAL INFORMATION
ITEM 1: Unaudited Financial Statements
Consolidated Balance Sheets	1
Unaudited Consolidated Statements of Operations	2
Unaudited Consolidated Statements of Comprehensive Income	3
Unaudited Consolidated Statements of Cash Flows	4
Unaudited Consolidated Statements of Stockholders’ Equity	5
Notes to Unaudited Consolidated Financial Statements	6
ITEM 2: Management’s Discussion and Analysis of Financial Condition and Results of Operations	28
ITEM 3: Quantitative and Qualitative Disclosures About Market Risk	40
ITEM 4: Controls and Procedures	40
PART II: OTHER INFORMATION
ITEM 1: Legal Proceedings	41
ITEM 1A: Risk Factors	41
ITEM 2: Unregistered Sales of Equity Securities and Use of Proceeds	41
ITEM 3: Defaults Upon Senior Securities	41
ITEM 4: Mine Safety Disclosures	41
ITEM 5: Other Information	41
ITEM 6: Exhibits	42
Signatures	43

CLEAN HARBORS, INC. AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS

(in thousands)

	June 30, 2017			December 31, 2016
ASSETS	(unaudited)
Current assets:
Cash and cash equivalents	$	446,366		$	306,997
Accounts receivable, net of allowances aggregating $26,782 and $29,249, respectively	512,375			496,226
Unbilled accounts receivable	46,576			36,190
Deferred costs	21,054			18,914
Inventories and supplies	172,540			178,428
Prepaid expenses and other current assets	35,823			56,116
Total current assets	1,234,734			1,092,871
Property, plant and equipment, net	1,602,453			1,611,827
Other assets:
Goodwill	472,819			465,154
Permits and other intangibles, net	482,828			498,721
Other	13,448			13,347
Total other assets	969,095			977,222
Total assets	$	3,806,282		$	3,681,920
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
Current portion of long-term obligations	$	107,798		$	—
Accounts payable	224,218			229,534
Deferred revenue	72,089			64,397
Accrued expenses	191,495			190,721
Current portion of closure, post-closure and remedial liabilities	23,700			20,016
Total current liabilities	619,300			504,668
Other liabilities:
Closure and post-closure liabilities, less current portion of $6,745 and $6,220, respectively	53,048			52,111
Remedial liabilities, less current portion of $16,955 and $13,796, respectively	109,204			114,211
Long-term obligations, less current portion	1,626,505			1,633,272
Deferred taxes, unrecognized tax benefits and other long-term liabilities	297,288			293,417
Total other liabilities	2,086,045			2,093,011
Commitments and contingent liabilities (See Note 15)
Stockholders’ equity:
Common stock, $.01 par value:
Authorized 80,000,000; shares issued and outstanding 57,153,687 and 57,297,978 shares, respectively	572			573
Shares held under employee participation plan	—			(469		)
Additional paid-in capital	716,712			725,670
Accumulated other comprehensive loss	(193,177		)	(214,326		)
Accumulated earnings	576,830			572,793
Total stockholders’ equity	1,100,937			1,084,241
Total liabilities and stockholders’ equity	$	3,806,282		$	3,681,920

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

1

CLEAN HARBORS, INC. AND SUBSIDIARIES

UNAUDITED CONSOLIDATED STATEMENTS OF OPERATIONS

(in thousands except per share amounts)

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2017			2016			2017			2016
Revenues:
Service revenues	$	610,940		$	584,562		$	1,171,154		$	1,114,793
Product revenues	141,848			112,948			270,575			218,800
Total revenues	752,788			697,510			1,441,729			1,333,593
Cost of revenues (exclusive of items shown separately below)
Service revenues	412,356			388,684			803,443			762,670
Product revenues	107,447			91,318			212,945			181,611
Total cost of revenues	519,803			480,002			1,016,388			944,281
Selling, general and administrative expenses	112,294			107,063			224,515			211,547
Accretion of environmental liabilities	2,416			2,548			4,706			5,053
Depreciation and amortization	71,531			73,393			143,943			142,295
Income from operations	46,744			34,504			52,177			30,417
Other expense	(833		)	(189		)	(2,382		)	(539		)
Loss on early extinguishment of debt	(6,045		)	—			(6,045		)	—
Gain on sale of business	31,722			—			31,722			—
Interest expense, net of interest income of $311, $225, $520 and $375, respectively	(22,492		)	(21,647		)	(45,068		)	(40,627		)
Income (loss) before provision for income taxes	49,096			12,668			30,404			(10,749		)
Provision for income taxes	23,216			8,702			25,917			6,156
Net income (loss)	$	25,880		$	3,966		$	4,487		$	(16,905	)
Earnings (loss) per share:
Basic	$	0.45		$	0.07		$	0.08		$	(0.29	)
Diluted	$	0.45		$	0.07		$	0.08		$	(0.29	)
Shares used to compute earnings (loss) per share - Basic	57,190			57,549			57,226			57,599
Shares used to compute earnings (loss) per share - Diluted	57,336			57,678			57,349			57,599

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

2

CLEAN HARBORS, INC. AND SUBSIDIARIES

UNAUDITED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(in thousands)

	Three Months Ended					Six Months Ended
	June 30,					June 30,
	2017		2016			2017		2016
Net income (loss)	$	25,880	$	3,966		$	4,487	$	(16,905	)
Other comprehensive income (loss):
Unrealized gains on available-for-sale securities (net of taxes of $20, $0, $122 and $0, respectively)	27		—			159		—
Reclassification adjustment for losses on available-for-sale securities included in net income (loss) (net of taxes of $29, $0, $79 and $0, respectively)	47		—			143		—
Foreign currency translation adjustments	15,024		(1,178		)	20,847		44,659
Other comprehensive income (loss)	15,098		(1,178		)	21,149		44,659
Comprehensive income	$	40,978	$	2,788		$	25,636	$	27,754

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

3

CLEAN HARBORS, INC. AND SUBSIDIARIES

UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS

(in thousands)

	Six Months Ended
	June 30,
	2017			2016
Cash flows from operating activities:
Net income (loss)	$	4,487		$	(16,905	)
Adjustments to reconcile net loss to net cash from operating activities:
Depreciation and amortization	143,943			142,295
Allowance for doubtful accounts	3,580			3,228
Amortization of deferred financing costs and debt discount	1,660			1,772
Accretion of environmental liabilities	4,706			5,053
Changes in environmental liability estimates	(129		)	(315		)
Deferred income taxes	190			(6,521		)
Stock-based compensation	5,172			4,739
Excess tax benefit of stock-based compensation	—			(2		)
Net tax deficiency on stock based awards	—			(603		)
Other expense	2,382			1,049
Gain on sale of business	(31,722		)	—
Loss on early extinguishment of debt	6,045			—
Environmental expenditures	(6,102		)	(6,454		)
Changes in assets and liabilities, net of acquisitions
Accounts receivable and unbilled accounts receivable	(31,154		)	993
Inventories and supplies	(6,307		)	(1,113		)
Other current assets	13,918			(4,789		)
Accounts payable	(2,686		)	(8,397		)
Other current and long-term liabilities	8,948			6,021
Net cash from operating activities	116,931			120,051
Cash flows used in investing activities:
Additions to property, plant and equipment	(88,742		)	(123,529		)
Proceeds from sales of fixed assets	2,121			2,668
Acquisitions, net of cash acquired	(9,277		)	(58,989		)
Proceeds on sale of businesses, net of transactional costs	46,391			—
Additions to intangible assets, including costs to obtain or renew permits	(1,239		)	(973		)
Purchases of available-for-sale securities	—			(598		)
Proceeds from sale of investments	376			—
Net cash used in investing activities	(50,370		)	(181,421		)
Cash flows from financing activities:
Change in uncashed checks	(8,361		)	(11,022		)
Proceeds from exercise of stock options	46			184
Issuance of restricted shares, net of shares remitted	(2,132		)	(1,879		)
Repurchases of common stock	(12,257		)	(10,134		)
Deferred financing costs paid	(4,727		)	(2,614		)
Excess tax benefit of stock-based compensation	—			2
Premiums paid on early extinguishment of debt	(4,665		)	—
Principal payment on debt	(296,202		)	—
Issuance of senior secured notes, net of discount	399,000			—
Issuance of senior unsecured notes, including premium	—			250,625
Net cash from financing activities	70,702			225,162
Effect of exchange rate change on cash	2,106			4,423
Increase in cash and cash equivalents	139,369			168,215
Cash and cash equivalents, beginning of period	306,997			184,708
Cash and cash equivalents, end of period	$	446,366		$	352,923
Supplemental information:
Cash payments for interest and income taxes:
Interest paid	$	50,432		$	44,275
Income taxes paid	13,407			23,872
Non-cash investing and financing activities:
Property, plant and equipment accrued	16,213			24,187
Transfer of inventory to property, plant and equipment	12,641			—

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

4

CLEAN HARBORS, INC. AND SUBSIDIARIES

UNAUDITED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY

(in thousands)

	Common Stock					Shares Held Under Employee Participation Plan						Accumulated Other Comprehensive Loss
	Number of Shares		$ 0.01 Par Value						Additional Paid-in Capital						Accumulated Earnings			Total Stockholders’ Equity
Balance at January 1, 2017	57,298		$	573		$	(469	)	$	725,670		$	(214,326	)	$	572,793		$	1,084,241
Cumulative effect of change in accounting for stock based compensation	—		—			—			681			—			(450		)	231
Net income	—		—			—			—			—			4,487			4,487
Other comprehensive income	—		—			—			—			21,149			—			21,149
Stock-based compensation	—		—			—			5,172			—			—			5,172
Issuance of restricted shares, net of shares remitted	93		1			—			(2,133		)	—			—			(2,132		)
Shares held under employee participation plan	(25	)	—			469			(469		)	—			—			—
Repurchases of common stock	(214	)	(2		)	—			(12,255		)	—			—			(12,257		)
Exercise of stock options	2		—			—			46			—			—			46
Balance at June 30, 2017	57,154		$	572		$	—		$	716,712		$	(193,177	)	$	576,830		$	1,100,937

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

5

CLEAN HARBORS, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(1) BASIS OF PRESENTATION

The accompanying consolidated interim financial statements are unaudited and include the accounts of Clean Harbors, Inc. and its subsidiaries (collectively, “Clean Harbors,” 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, 2016, which includes the audited consolidated balance sheet as of December 31, 2016 from which the one presented herein was derived.

(2) SIGNIFICANT ACCOUNTING POLICIES

The Company's significant accounting policies are described in Note 2, "Significant Accounting Policies," in the Company's Annual Report on Form 10-K for the year ended December 31, 2016. There have been no material changes in these policies or their application.

Reclassifications

As disclosed in the Company's Annual Report on Form 10-K for the year ended December 31, 2016, in the fourth quarter of 2016 the Company changed the manner in which it manages its business, makes operating decisions and assesses the Company's performance. The Company's operations are now managed in six operating segments: Technical Services, Industrial Services, Field Services, Safety-Kleen, Oil and Gas Field Services and Lodging Services. For purposes of segment disclosure the Industrial Services and Field Services operating segments have been aggregated into a single reportable segment based upon their similar economic and other characteristics, and the Oil and Gas Field Services and Lodging Services operating segments have been combined as they do not meet the quantitative thresholds for separate presentation. The amounts presented for the three and six months ended June 30, 2016 have been recast to reflect the impact of such changes. These reclassifications and adjustments had no effect on consolidated statements of operations, consolidated statements of comprehensive income, consolidated statements of cash flows or consolidated statements of stockholders' equity for any of the periods presented.

Recent Accounting Pronouncements

Standards implemented

In July 2015, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2015-11, Inventory (Topic 330). The amendment provides guidance regarding the measurement of inventory. Entities should measure inventory within the scope of this update at the lower of cost and net realizable value. The adoption of ASU 2015-11 was applied prospectively and as of January 1, 2017 did not have an impact on the Company's consolidated financial statements.

In March 2016, the FASB issued ASU 2016-09, Compensation-Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting. 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. Stock-based compensation excess tax benefits or deficiencies are now reflected in the Consolidated Statements of Operations as a component of the provision for income taxes, whereas they previously were recognized in equity. Additionally, the Consolidated Statements of Cash Flows now include excess tax benefits as an operating activity. Previously, income tax benefits at settlement of an award were reported as a reduction to operating cash flows and an increase to financing cash flows to the extent that those benefits exceeded the income tax benefits reported in earnings during the award's vesting period. The Company has elected to apply that change in cash flow classification on a prospective basis, leaving previously reported net cash from operating activities and net cash from financing activities in the accompanying consolidated statement of cash flows for the period ended June 30, 2016 unchanged. Finally, the Company has elected to account for forfeitures as they occur, rather than estimate expected forfeitures. As a result of the adoption of this update, the Company recorded a cumulative-effect adjustment that reduced beginning retained earnings by $0.5 million, net of tax.

6

In August 2016, the 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. The Company early adopted the amendments in the Update on a retrospective basis in the second quarter of fiscal year 2017. As a result of adoption, the Company recorded cash paid in the second quarter for debt prepayment and extinguishment costs as financing activities in the accompanying consolidated statements of cash flows.

Standard to be implemented

In May 2014, FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606). ASU 2014-09 outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry-specific guidance. In August 2015, FASB issued ASU 2015-14 which deferred the effective date of ASU 2014-09 for all entities by one year. In March 2016, FASB issued ASU 2016-08, which 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. In April 2016, FASB issued ASU 2016-10, which 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. In May 2016, FASB issued ASU 2016-12, which provided narrow scope improvements and practical expedients on assessing collectability, presentation of sales taxes, noncash consideration, and completed contracts and contract modifications at transition. ASU 2014-09 is currently effective for annual reporting periods (including interim reporting periods within those periods) beginning after December 15, 2017. The guidance permits two methods of adoption: retrospectively to each prior reporting period presented (full retrospective method), or retrospectively with the cumulative effect of initially applying the guidance recognized at the date of initial application (the cumulative catch-up transition method). The Company expects that it will adopt ASU 2014‑09 beginning in the first quarter of 2018 and continues its evaluation of the impact of the new standard on its accounting policies, disclosures, processes, and system requirements. The Company has assigned internal resources to assist in this implementation project and believes that the project is progressing timely. The Company currently anticipates adopting this ASU using the modified retrospective method. As the Company completes its evaluation of this new standard, the Company's preliminary assessments could change.

In February 2017, the FASB issued ASU 2017-05, Other Income-Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20): Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets. The amendments in this Update are meant to clarify the scope of ASC Subtopic 610-20, Other Income-Gains and Losses from the Derecognition of Nonfinancial Assets and to add guidance for partial sales of nonfinancial assets. The amendments in this Update should be applied using a full retrospective method or a modified retrospective method and are effective at the same time as ASU 2014-09. Further, the Company is required to adopt ASU 2017-05 at the same time that it adopts the guidance in ASU 2014-09. Adoption is not expected to have a material impact on the Company's consolidated financial statements.

In May 2017, the FASB issued ASU 2017-09, Compensation-Stock Compensation (Topic 718): Scope of Modification Accounting. The amendments in this Update are meant to provide guidance about which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting in Topic 718. The amendments in this Update should be applied prospectively to an award modified on or after the adoption date and are effective for annual reporting periods (including interim reporting periods within those periods) beginning after December 15, 2017. Adoption is not expected to have a material impact on the Company's consolidated financial statements.

(3) BUSINESS COMBINATIONS

2017 Acquisitions

On January 31, 2017, the Company acquired a privately held company for a purchase price of approximately $11.9 million in cash, net of cash acquired, and subject to customary post-closing adjustments. The acquired business produces and distributes oil products and therefore complements the Company's closed loop model as it relates to the sale of its oil products. The acquired company is included in the Safety-Kleen operating segment. In connection with this acquisition a preliminary goodwill amount of $4.9 million was recognized.

7

2016 Acquisitions

During 2016, the Company acquired seven businesses that complement the strategy to create a closed loop model as it relates to the sale of the Company's oil products. These acquisitions provided the Company with three additional oil re-refineries while also expanding its used motor oil collection network and providing greater blending and packaging capabilities. These acquisitions also provided 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 into the Safety-Kleen operating segment with certain operations also being integrated into the Technical Services and Industrial Services operating segments. The combined purchase price for the seven acquisitions was $204.8 million in cash, net of cash acquired. Upon acquisition, the acquired entities were immediately integrated into the Company's operating segments. Therefore it is impracticable to measure earnings attributable to the acquired businesses.

The allocation of the purchase price was based on estimates of the fair value of assets acquired and liabilities assumed as of the acquisition dates. 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 seven acquisitions in the second

quarter of 2017.

The components and allocation of the purchase price consist of the following amounts (in thousands):

	At Acquisition Dates As Reported December 31, 2016			Measurement Period Adjustments			Final Allocations
Accounts receivable	$	15,767		$	475		$	16,242
Inventories and supplies	12,515			173			12,688
Prepaid expenses and other current assets	777			(25		)	752
Property, plant and equipment	143,025			891			143,916
Permits and other intangibles	28,856			—			28,856
Current liabilities	(20,258		)	353			(19,905		)
Closure and post-closure liabilities	(2,408		)	(596		)	(3,004		)
Remedial liabilities, less current portion	(2,041		)	(504		)	(2,545		)
Deferred taxes, unrecognized tax benefits and other long-term liabilities	(17,019		)	(3,200		)	(20,219		)
Total identifiable net assets	159,214			(2,433		)	156,781
Goodwill	45,791			2,186			47,977
Total purchase price, net of cash acquired	$	205,005		$	(247	)	$	204,758

Pro forma revenue and earnings amounts on a combined basis as if these acquisitions had been completed on January 1, 2016 are immaterial to the consolidated financial statements of the Company since that date.

(4) DISPOSITION OF BUSINESS

2017 Disposition

On June 30, 2017, the Company completed the sale of its Transformer Services business, as part of its continuous focus on improving or divesting certain non-core operations. The Transformer Services business was a non-core business previously included within the Technical Services operating segment and has sold for approximately $46.5 million ($44.4 million net of $2.1 million in transactional related costs) subject to customary post-closing conditions. As a result of the sale, the Company recognized during the three and six months ended June 30, 2017, a pre-tax gain of $31.7 million which is included in gain on sale of business in the Company’s consolidated statement of operations.

8

The following table presents the carrying amounts of the Company's Transformer Services business that was disposed of on June 30, 2017 (in thousands):

	June 30, 2017
Total current assets	$	7,216
Property, plant and equipment, net	8,773
Total other assets	1,681
Total assets divested	$	17,670
Total current liabilities	3,849
Total other liabilities	1,170
Total liabilities divested	$	5,019
Net carrying value divested	$	12,651

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 entity. However, the Company determined that the disposition represented an individually significant component of the Company’s business. The following table presents income attributable to the Transformer Services business included in the Company's consolidated results of operations for each of the periods shown and through its disposition on June 30, 2017 (in thousands):

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2017		2016		2017		2016
Income before provision for income taxes	$	1,873	$	986	$	2,771	$	1,793

2016 Disposition

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. During the first quarter of 2017, the Company and the buyer of the Catalyst Services business agreed to final working capital amounts and as a result the Company received $2.0 million of final sale proceeds.

The following table presents the income before provision for income taxes attributable to the Catalyst Services business included in the Company's consolidated results of operations for three and six months ended June 30, 2016 (in thousands):

	Three Months Ended		Six Months Ended
	June 30, 2016		June 30, 2016
Income before provision for income taxes	$	2,607	$	1,508

(5) INVENTORIES AND SUPPLIES

Inventories and supplies consisted of the following (in thousands):

	June 30, 2017		December 31, 2016
Oil and oil products	$	57,554	$	52,158
Supplies and drums	92,995		90,610
Solvent and solutions	8,575		8,566
Modular camp accommodations	2,699		15,255
Other	10,717		11,839
Total inventories and supplies	$	172,540	$	178,428

As of June 30, 2017 and December 31, 2016, other inventories consisted primarily of cleaning fluids, such as absorbents and wipers, and automotive fluids, such as windshield washer fluid and antifreeze. During the second quarter of 2017, $12.6 million of modular camp accommodations inventory was transferred to and included as camp equipment within the Company's property, plant and equipment amount as such assets will be utilized in the Company's ongoing camp and lodging operations.

9

(6) PROPERTY, PLANT AND EQUIPMENT

Property, plant and equipment consisted of the following (in thousands):

	June 30, 2017		December 31, 2016
Land	$	121,114	$	120,575
Asset retirement costs (non-landfill)	14,861		14,567
Landfill assets	141,878		139,708
Buildings and improvements	406,030		373,160
Camp equipment	168,524		152,740
Vehicles	564,723		541,022
Equipment	1,605,581		1,483,736
Furniture and fixtures	5,524		5,492
Construction in progress	54,934		146,904
	3,083,169		2,977,904
Less - accumulated depreciation and amortization	1,480,716		1,366,077
Total property, plant and equipment, net	$	1,602,453	$	1,611,827

Interest in the amount of $0.1 million and $0.2 million was capitalized to fixed assets during the three and six months ended June 30, 2017, respectively. Interest in the amount of $1.3 million and $2.5 million was capitalized to fixed assets during the three and six months ended June 30, 2016, respectively. Depreciation expense, inclusive of landfill amortization, was $61.8 million and $125.2 million for the three and six months ended June 30, 2017, respectively. Depreciation expense, inclusive of landfill amortization, was $63.5 million and $122.8 million for the three and six months ended June 30, 2016, respectively.

(7) GOODWILL AND OTHER INTANGIBLE ASSETS

The changes in goodwill by segment for the six months ended June 30, 2017 were as follows (in thousands):

	Technical Services			Industrial & Field Services		Safety-Kleen		Oil, Gas and Lodging Services		Totals
Balance at January 1, 2017	$	61,116		$	107,968	$	296,070	$	—	$	465,154
Increase from current period acquisitions	—			—		4,916		—		4,916
Measurement period adjustments from prior period acquisitions	—			—		2,186		—		2,186
Decrease from disposition of business	(1,300		)	—		—				(1,300		)
Foreign currency translation and other	157			615		1,091		—		1,863
Balance at June 30, 2017	$	59,973		$	108,583	$	304,263	$	—	$	472,819

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, 2016 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 a result of the sale of the Transformer Services business discussed in Note 4, "Disposition of Business," to the accompanying financial statements, the Company assessed qualitative factors to determine whether it was more likely than not that the fair value of the remaining Technical Services reporting unit was less than its carrying value. As a result of its qualitative assessment, the Company noted no indicators of impairment for the remaining Technical Services reporting unit existed as of June 30, 2017.

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As of June 30, 2017 and December 31, 2016, the Company's total finite-lived and indefinite-lived intangible assets consisted of the following (in thousands):

	June 30, 2017							December 31, 2016
	Cost		Accumulated Amortization		Net		Weighted Average Remaining Amortization Period (in years)	Cost		Accumulated Amortization		Net		Weighted Average Remaining Amortization Period (in years)
Permits	$	173,174	$	70,698	$	102,476	21.4	$	171,637	$	67,301	$	104,336	18.9
Customer and supplier relationships	395,911		143,038		252,873		11.9	393,426		127,462		265,964		12.2
Other intangible assets	34,673		30,166		4,507		7.5	34,254		28,456		5,798		7.1
Total amortizable permits and other intangible assets	603,758		243,902		359,856		14.5	599,317		223,219		376,098		13.9
Trademarks and trade names	122,972		—		122,972		Indefinite	122,623		—		122,623		Indefinite
Total permits and other intangible assets	$	726,730	$	243,902	$	482,828		$	721,940	$	223,219	$	498,721

Amortization expense of permits and other intangible assets was $9.7 million and $18.8 million for the three and six months ended June 30, 2017, respectively. Amortization expense of permits and other intangible assets was $9.9 million and $19.5 million for the three and six months ended June 30, 2016, respectively.

The expected amortization of the net carrying amount of finite-lived intangible assets at June 30, 2017 was as follows (in thousands):

Years Ending December 31,	Expected Amortization
2017 (six months)	$	18,078
2018	34,091
2019	31,238
2020	28,756
2021	26,557
Thereafter	221,136
	$	359,856

(8) ACCRUED EXPENSES

Accrued expenses consisted of the following at June 30, 2017 and December 31, 2016 (in thousands):

	June 30, 2017		December 31, 2016
Insurance	$	58,816	$	63,061
Interest	15,006		21,536
Accrued compensation and benefits	45,159		34,641
Income, real estate, sales and other taxes	37,474		35,083
Other	35,040		36,400
	$	191,495	$	190,721

As of June 30, 2017 and December 31, 2016, other accrued expenses included accrued legal matters of $3.1 million and $3.8 million, respectively, and accrued severance charges of $1.8 million and $2.9 million, respectively.

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(9) CLOSURE AND POST-CLOSURE LIABILITIES

The changes to closure and post-closure liabilities (also referred to as “asset retirement obligations”) from January 1, 2017 through June 30, 2017 were as follows (in thousands):

	Landfill Retirement Liability			Non-Landfill Retirement Liability			Total
Balance at January 1, 2017	$	30,630		$	27,701		$	58,331
Measurement period adjustments from prior period acquisitions	—			596			596
New asset retirement obligations	894			—			894
Adjustment related to disposition of business	—			(1,170		)	(1,170		)
Accretion	1,094			1,270			2,364
Changes in estimates recorded to statement of operations	—			(262		)	(262		)
Changes in estimates recorded to balance sheet	—			(287		)	(287		)
Expenditures	(556		)	(254		)	(810		)
Currency translation and other	82			55			137
Balance at June 30, 2017	$	32,144		$	27,649		$	59,793

All of the landfill facilities included in the above were active as of June 30, 2017. There were no significant charges (benefits) in 2017 resulting from changes in estimates for closure and post-closure liabilities.

New asset retirement obligations incurred during the first six months of 2017 were discounted at the credit-adjusted risk-free rate of 6.32%.

(10) REMEDIAL LIABILITIES

The changes to remedial liabilities for the six months ended June 30, 2017 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, 2017	$	1,777		$	64,151		$	62,079		$	128,007
Measurement period adjustments from prior period acquisitions	—			—			504			504
Accretion	43			1,332			967			2,342
Changes in estimates recorded to statement of operations	(36		)	(120		)	289			133
Expenditures	(19		)	(2,068		)	(3,205		)	(5,292		)
Currency translation and other	(1		)	2,712			(2,246		)	465
Balance at June 30, 2017	$	1,764		$	66,007		$	58,388		$	126,159

In the six months ended June 30, 2017, there were no significant charges (benefits) resulting from changes in estimates for remedial liabilities.

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(11) FINANCING ARRANGEMENTS

The following table is a summary of the Company’s financing arrangements (in thousands):

	June 30, 2017			December 31, 2016
Senior secured notes due June 30, 2024 ("Term Loan"), current	$	4,000		$	—
Senior unsecured notes, at 5.25%, due August 1, 2020 ("2020 Notes"), current	103,798			—
Current portion of long-term obligations, at carrying value	$	107,798		$	—
Senior secured notes due June 30, 2024	$	396,000		$	—
Senior unsecured notes, at 5.25%, due August 1, 2020	400,000			800,000
Senior unsecured notes, at 5.125%, due June 1, 2021 ("2021 Notes")	845,000			845,000
Long-term obligations	$	1,641,000		$	1,645,000
Unamortized debt issuance costs and debt discount/premium, net	(14,495		)	(11,728		)
Long-term obligations, at carrying value	$	1,626,505		$	1,633,272
Total current and long-term obligations, at carrying value	$	1,734,303		$	1,633,272

On June 30, 2017, the Company, and substantially all of the Company’s domestic subsidiaries as guarantors, entered into a $400.0 million senior secured Credit Agreement (the "Term Loan agreement") with Goldman Sachs Lending Partners LLC, as administrative agent and collateral agent (the “Agent”), and certain other financial institutions. Loans under the Term Loan Agreement will mature on June 30, 2024 and may be prepaid at any time without premium or penalty other than customary breakage costs with respect to Eurodollar based loans or if the Company engages in certain repricing transactions before December 31, 2017, in which event a 1.0% prepayment premium would be due. The Company’s obligations under the Term Loan Agreement are guaranteed by all of the Company’s domestic restricted subsidiaries and secured by liens on substantially all of the assets of the Company and the guarantors.

Borrowings under the Term Loan Agreement will bear interest, at the Company’s election, at either of the following rates: (a) the sum of the Eurodollar Rate (as defined in the Term Loan Agreement) plus 2.00%, or (b) the sum of the Base Rate (as defined in the Term Loan Agreement) plus 1.00%, with the Eurodollar Rate being subject to a floor of 0.00%. The effective interest rate of the Term Loan on June 30, 2017 was 3.23%. The Term Loan Agreement contains representations and warranties, affirmative and negative covenants, and events of default, which the Company believes are usual and customary for an agreement of this type. Such covenants restrict the Company’s ability, among other matters, to incur debt, create liens on the Company’s assets, make restricted payments or investments or enter into transactions with affiliates.

Upon entering into the Term Loan Agreement on June 30, 2017, the Company used approximately $312.6 million of the proceeds to purchase approximately $296.2 million aggregate principal amount (the “Repurchased Notes”) of the Company’s previously outstanding 2020 Notes, pay accrued interest of approximately $6.4 million on the Repurchased Notes, premiums to repay the debt early of $4.7 million and expenses incurred of approximately $5.3 million in connection with the Term Loan financing and the tender offer for the 2020 Notes.

On June 30, 2017, the Company also delivered a notice of redemption to the holders of the approximately $503.8 million aggregate principal amount of 2020 Notes which remained outstanding after the purchase of the Repurchased Notes. Pursuant to that notice, the Company redeemed on August 1, 2017, approximately $103.8 million aggregate principal amount of 2020 Notes at a redemption price of 101.313%, plus accrued but unpaid interest. The Company financed the redemption through the remaining net proceeds of the Term Loan financing described above, plus available cash.

At June 30, 2017, the fair value of the Term Loan debt was $400.0 million. At June 30, 2017 and December 31, 2016, the fair value of the Company's 2020 Notes was $510.7 million and $820.0 million, respectively, based on quoted market prices for the instrument. At June 30, 2017 and December 31, 2016, the fair value of the Company's 2021 Notes was $863.0 million and $861.9 million, respectively, based on quoted market prices for the instrument. The fair value of the Term Loan debt, 2020 Notes and 2021 Notes are considered a Level 2 measure according to the fair value hierarchy.

The Company also maintains a $400.0 million revolving credit facility under which as of June 30, 2017 and December 31, 2016, the Company had no outstanding loan balances. At June 30, 2017, approximately $225.3 million was available to borrow and outstanding letters of credit were $125.9 million. At December 31, 2016, $195.2 million was available to borrow and outstanding letters of credit were $132.6 million.    

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(12) EARNINGS (LOSS) PER SHARE

The following are computations of basic and diluted earnings (loss) per share (in thousands except for per share amounts):

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2017		2016		2017		2016
Numerator for basic and diluted earnings (loss) per share:
Net income (loss)	$	25,880	$	3,966	$	4,487	$	(16,905	)
Denominator:
Basic shares outstanding	57,190		57,549		57,226		57,599
Dilutive effect of equity-based compensation awards	146		129		123		—
Dilutive shares outstanding	57,336		57,678		57,349		57,599
Basic earnings (loss) per share:	$	0.45	$	0.07	$	0.08	$	(0.29	)
Diluted earnings (loss) per share:	$	0.45	$	0.07	$	0.08	$	(0.29	)

For the three months ended June 30, 2017 and 2016, the dilutive effect of all then outstanding options, restricted stock and performance awards is included in the EPS calculations above except for 142,503 and 348,197, respectively, of outstanding performance stock awards for which the performance criteria were not attained at that time and 14,699 and 9,537, respectively, of restricted stock awards which were antidilutive at that time.

For the six months ended June 30, 2017, the dilutive effect of all then outstanding options, restricted stock and performance awards is included in the EPS calculations above except for 142,503 of outstanding performance stock awards for which the performance criteria were not attained at that time and 21,013 of restricted stock awards which were antidilutive at that time.

As a result of the net loss reported for the six months ended June 30, 2016, all then outstanding stock options, restricted stock awards and performance awards totaling 886,685 were excluded from the calculation of diluted earnings (loss) per share as their inclusion would have an antidilutive effect. 

(13) ACCUMULATED OTHER COMPREHENSIVE LOSS

The changes in accumulated other comprehensive loss by component and related tax effects for the six months ended June 30, 2017 were as follows (in thousands):    

	Foreign Currency Translation			Unrealized Gains on Available-For-Sale Securities			Unfunded Pension Liability			Total
Balance at January 1, 2017	$	(212,211	)	$	(321	)	$	(1,794	)	$	(214,326	)
Other comprehensive income before reclassifications	20,847			281			—			21,128
Amounts reclassified out of accumulated other comprehensive loss	—			222			—			222
Tax effects				(201		)	—			(201		)
Other comprehensive income	$	20,847		$	302		$	—		$	21,149
Balance at June 30, 2017	$	(191,364	)	$	(19	)	$	(1,794	)	$	(193,177	)

The amounts reclassified out of accumulated other comprehensive loss into the consolidated statements of operations, with presentation location during the three and six months ended June 30, 2017 were as follow (in thousands):

	For the Three Months Ended		For the Six Months Ended
Comprehensive (Loss) Income Components	June 30, 2017		June 30, 2017		Location
Unrealized holding gains on available-for-sale investments	$	76	$	222	Other expense

There were no reclassifications out of accumulated other comprehensive loss into the consolidated statements of operations during the three and six months ended June 30, 2016.

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(14) STOCK-BASED COMPENSATION

Total stock-based compensation cost charged to selling, general and administrative expenses for the three and six months ended June 30, 2017 was $2.9 million and $5.2 million, respectively. Total stock-based compensation cost charged to selling, general and administrative expenses for the three and six months ended June 30, 2016 was $2.6 million and $4.7 million, respectively. The total income tax benefit recognized in the consolidated statements of operations from stock-based compensation was $0.8 million and $1.5 million for the three and six months ended June 30, 2017, respectively. The total income tax benefit recognized in the consolidated statements of operations from stock-based compensation was $0.8 million and $1.4 million for the three and six months ended June 30, 2016, 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 six months ended June 30, 2017:

Restricted Stock	Number of Shares		Weighted Average Grant-Date Fair Value
Balance at January 1, 2017	510,041		$	52.65
Granted	161,250		$	56.15
Vested	(105,064	)	$	54.17
Forfeited	(34,374	)	$	51.50
Balance at June 30, 2017	531,853		$	53.49

As of June 30, 2017, there was $23.8 million of total unrecognized compensation cost arising from restricted stock awards under the Company's Plans. This cost is expected to be recognized over a weighted average period of 2.6 years. The total fair value of restricted stock vested during the three and six months ended June 30, 2017 was $4.5 million and $6.0 million, respectively. The total fair value of restricted stock vested during the three and six months ended June 30, 2016 was $2.3 million and $6.1 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, Free Cash Flow 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 six months ended June 30, 2017:

Performance Stock	Number of Shares		Weighted Average Grant-Date Fair Value
Balance at January 1, 2017	220,882		$	54.69
Granted	588		$	54.44
Vested	(25,168	)	$	54.84
Forfeited	(16,187	)	$	56.24
Balance at June 30, 2017	180,115		$	54.70

As of June 30, 2017, there was $0.9 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 June 30, 2017. The total fair value of performance awards vested during the six months ended June 30, 2017 was $1.4 million. No

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performance awards vested during the three months ended June 30, 2016. The total fair value of performance awards vested during the six months ended June 30, 2016 was $0.4 million.

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 six months ended June 30, 2017, the Company repurchased and retired a total of 0.1 million shares and 0.2 million respectively, of the Company's common stock for a total cost of $5.5 million and $12.3 million, respectively. During the three and six months ended June 30, 2016, the Company repurchased and retired a total of 0.1 million shares and 0.2 million shares, respectively, of the Company's common stock for a total cost of $5.1 million and $10.1 million, respectively. Through June 30, 2017, the Company has repurchased and retired a total of 4.1 million shares of the Company's common stock for a total cost of $212.1 million under this program. As of June 30, 2017, an additional $87.9 million remains available for repurchase of shares under the current authorized program.

(15) 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 June 30, 2017 and December 31, 2016, the Company had recorded reserves of $20.8 million and $22.0 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 June 30, 2017 and December 31, 2016, 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 June 30, 2017 and December 31, 2016, the $20.8 million and $22.0 million, respectively, of reserves consisted of (i) $17.7 million and $18.2 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) $3.1 million and $3.8 million, respectively, primarily related to federal, state and provincial enforcement actions, which were included in accrued expenses on the consolidated balance sheets.

As of June 30, 2017, the principal legal and administrative proceedings in which the Company was involved, or which had been terminated during 2017, 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

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to the resolution of this matter and believes this matter will not have 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 June 30, 2017 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 June 30, 2017, 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 June 30, 2017. From January 1, 2017 to June 30, 2017, 17 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, 33 are now settled, 16 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. The Company 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 Environmental Protection Agency (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.

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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 and McKesson which had shipped wastes to those sites. Accordingly, Waste Management or McKesson are paying all costs of defending those subsidiaries in those 17 cases, including legal fees and settlement costs. However, there can be no guarantee that the Company's ultimate liabilities for those sites will not exceed the amount recorded or that indemnities applicable to any of these sites will be available to pay all or a portion of related costs. Except for the indemnification agreements which the Company holds from ChemWaste, 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 June 30, 2017 and December 31, 2016, there were five proceedings for which the Company reasonably believes 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.

(16) INCOME TAXES

The Company records a tax provision or benefit on an interim basis using an estimated annual effective tax rate. This rate is applied to the current period ordinary income or loss to determine the income tax provision or benefit allocated to the interim period. Losses from jurisdictions for which no benefit can be recognized and the income tax effects of unusual or infrequent items are excluded from the estimated annual effective tax rate and are recognized in the impacted interim period. The estimated annual effective tax rate may be significantly impacted by projected earnings mix by tax jurisdiction. Adjustments to the estimated annual effective income tax rate are recognized in the period when such estimates are revised.

The Company’s effective tax rate for the three and six months ended June 30, 2017 was 47.3% and 85.2% compared to 68.7% and 57.3% for the same periods in 2016. The variations in the effective income tax rates for the three and six months ended June 30, 2017 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 and in the second quarter of 2017 the tax expense associated with the gain on the sale of the Transformer Services business.

As of June 30, 2017 and December 31, 2016, the Company had recorded $1.8 million and $1.7 million, respectively, of liabilities for unrecognized tax benefits and $0.4 million and $0.3 million of interest, respectively.

Due to expiring statute of limitation periods, the Company believes that total unrecognized tax benefits will decrease by $0.4 million within the next 12 months.

(17) 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 its business, makes operating decisions and assesses performance. The Company's operations are managed in six operating segments: Technical Services, Industrial Services, Field Services, Safety-Kleen, Oil and Gas Field Services and Lodging Services. For purposes of segment disclosure the Industrial Services and Field Services operating segments have been aggregated into a single reportable segment based upon their similar economic and other characteristics, and the Oil and Gas Field Services and Lodging Services operating segments have been combined as they do not meet the quantitative thresholds for separate presentation.

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 operating segments described above are recorded as “Corporate Items.” Corporate Items revenues consist of two different operations for which the revenues are insignificant. Corporate Items cost of revenues represents certain central services that are not allocated to the Company's operating 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 operating segments.  

The following table reconciles third party revenues to direct revenues for the three and six months ended June 30, 2017 and 2016 (in thousands):

	For the Three Months Ended June 30, 2017											For the Three Months Ended June 30, 2016
	Third party revenues		Intersegment revenues, net			Corporate Items, net			Direct revenues			Third party revenues		Intersegment revenues, net			Corporate Items, net			Direct revenues
Technical Services	$	254,487	$	40,001		$	408		$	294,896		$	229,130	$	35,578		$	667		$	265,375
Industrial and Field Services	167,899		(9,067		)	(133		)	158,699			164,641		(7,922		)	(303		)	156,416
Safety-Kleen	302,956		(31,639		)	(2		)	271,315			277,715		(29,092		)	1			248,624
Oil, Gas and Lodging Services	27,245		705			45			27,995			24,860		1,436			79			26,375
Corporate Items	201		—			(318		)	(117		)	1,164		—			(444		)	720
Total	$	752,788	$	—		$	—		$	752,788		$	697,510	$	—		$	—		$	697,510

18

	For the Six Months Ended June 30, 2017											For the Six Months Ended June 30, 2016
	Third party revenues		Intersegment revenues, net			Corporate Items, net			Direct revenues			Third party revenues		Intersegment revenues, net			Corporate Items, net			Direct revenues
Technical Services	$	484,705	$	80,045		$	1,130		$	565,880		$	448,235	$	70,422		$	1,055		$	519,712
Industrial and Field Services	301,456		(17,426		)	(29		)	284,001			294,828		(14,597		)	(316		)	279,915
Safety-Kleen	595,857		(63,708		)	1			532,150			524,676		(57,613		)	367			467,430
Oil, Gas and Lodging Services	59,377		1,089			139			60,605			63,911		1,788			183			65,882
Corporate Items	334		—			(1,241		)	(907		)	1,943		—			(1,289		)	654
Total	$	1,441,729	$	—		$	—		$	1,441,729		$	1,333,593	$	—		$	—		$	1,333,593

The primary financial measure by which the Company evaluates the performance of its segments is "Adjusted EBITDA" which consists of net income (loss) plus accretion of environmental liabilities, depreciation and amortization, other expense, interest expense, net, loss on early extinguishment of debt, provision for income taxes and excludes gain on sale of business. Transactions between the segments are accounted for at the Company’s best estimate based on similar transactions with outside customers.

The following table presents Adjusted EBITDA information used by management by reported segment (in thousands):

	For the Three Months Ended						For the Six Months Ended
	June 30,						June 30,
	2017			2016			2017			2016
Adjusted EBITDA:
Technical Services	$	73,080		$	68,891		$	131,567		$	129,289
Industrial and Field Services	21,484			19,960			23,397			20,393
Safety-Kleen	60,281			55,234			112,649			95,289
Oil, Gas and Lodging Services	268			(1,199		)	58			111
Corporate Items	(34,422		)	(32,441		)	(66,845		)	(67,317		)
Total	$	120,691		$	110,445		$	200,826		$	177,765
Reconciliation to Consolidated Statements of Operations:
Accretion of environmental liabilities	2,416			2,548			4,706			5,053
Depreciation and amortization	71,531			73,393			143,943			142,295
Income from operations	46,744			34,504			52,177			30,417
Other expense	833			189			2,382			539
Loss on early extinguishment of debt	6,045			—			6,045			—
Gain on sale of business	(31,722		)	—			(31,722		)	—
Interest expense, net of interest income	22,492			21,647			45,068			40,627
Income (loss) before provision for income taxes	$	49,096		$	12,668		$	30,404		$	(10,749	)

19

The following table presents certain assets by reportable segment and in the aggregate (in thousands):

	June 30, 2017
	Technical Services		Industrial and Field Services		Safety-Kleen		Oil, Gas and Lodging Services		Corporate Items		Totals
Property, plant and equipment, net	$	512,058	$	243,195	$	590,282	$	181,001	$	75,917	$	1,602,453
Goodwill	59,973		108,583		304,263		—		—		472,819
Permits and other intangibles, net	76,022		17,135		381,020		8,651		—		482,828
Total assets	$	851,852	$	457,253	$	1,477,660	$	246,195	$	773,322	$	3,806,282

	December 31, 2016
	Technical Services		Industrial and Field Services		Safety-Kleen		Oil, Gas and Lodging Services		Corporate Items		Totals
Property, plant and equipment, net	$	521,134	$	245,143	$	584,647	$	182,038	$	78,865	$	1,611,827
Goodwill	61,116		107,968		296,070		—		—		465,154
Permits and other intangibles, net	78,625		17,817		391,390		10,889		—		498,721
Total assets	$	862,957	$	446,826	$	1,474,755	$	253,242	$	644,140	$	3,681,920

The following table presents total assets by geographical area (in thousands):

	June 30, 2017		December 31, 2016
United States	$	3,088,199	$	2,960,337
Canada	718,083		721,583
Total	$	3,806,282	$	3,681,920

(18) GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION

The 2020 Notes and the 2021 Notes (collectively, the "Notes") are guaranteed by substantially all of the Company’s subsidiaries organized in the United States. Each guarantor for the Notes is a 100% owned subsidiary of Clean Harbors, Inc. and its guarantee is both full and unconditional and joint and several. The guarantees are, however, subject to customary release provisions under which, in particular, the guarantee of any domestic restricted subsidiary will be released if the Company sells such subsidiary to an unrelated third party in accordance with the terms of the indentures which govern the Notes. The Notes are not guaranteed by

the Company’s subsidiaries organized outside the United States. The following supplemental condensed consolidating financial information for the parent company, the guarantor subsidiaries and the non-guarantor subsidiaries, respectively, is presented in conformity with the requirements of Rule 3-10 of SEC Regulation S-X (“Rule 3-10”).

Following is the condensed consolidating balance sheet at June 30, 2017 (in thousands):

	Clean Harbors, Inc.		Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Consolidating Adjustments			Total
Assets:
Cash and cash equivalents	$	51,391	$	303,996	$	90,979	$	—		$	446,366
Intercompany receivables	220,885		314,705		38,312		(573,902		)	—
Accounts receivables, net	—		419,338		93,037		—			512,375
Other current assets	897		222,283		59,658		(6,845		)	275,993
Property, plant and equipment, net	—		1,198,630		403,823		—			1,602,453
Investments in subsidiaries	2,893,232		570,837		—		(3,464,069		)	—
Intercompany debt receivable	—		89,441		24,701		(114,142		)	—
Goodwill	—		416,775		56,044		—			472,819
Permits and other intangibles, net	—		421,793		61,035		—			482,828
Other long-term assets	2,363		7,555		4,598		(1,068		)	13,448
Total assets	$	3,168,768	$	3,965,353	$	832,187	$	(4,160,026	)	$	3,806,282
Liabilities and Stockholders’ Equity:
Current liabilities	$	123,095	$	375,919	$	127,131	$	(6,845	)	$	619,300
Intercompany payables	314,530		257,453		1,919		(573,902		)	—
Closure, post-closure and remedial liabilities, net	—		145,777		16,475		—			162,252
Long-term obligations	1,626,505		—		—		—			1,626,505
Intercompany debt payable	3,701		21,000		89,441		(114,142		)	—
Other long-term liabilities	—		278,833		19,523		(1,068		)	297,288
Total liabilities	2,067,831		1,078,982		254,489		(695,957		)	2,705,345
Stockholders’ equity	1,100,937		2,886,371		577,698		(3,464,069		)	1,100,937
Total liabilities and stockholders’ equity	$	3,168,768	$	3,965,353	$	832,187	$	(4,160,026	)	$	3,806,282

20

Following is the condensed consolidating balance sheet at December 31, 2016 (in thousands):

	Clean Harbors, Inc.		Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Consolidating Adjustments			Total
Assets:
Cash and cash equivalents	$	51,417	$	155,943	$	99,637	$	—		$	306,997
Intercompany receivables	200,337		354,836		49,055		(604,228		)	—
Accounts receivables, net	—		417,029		79,197		—			496,226
Other current assets	3,096		234,408		69,257		(17,113		)	289,648
Property, plant and equipment, net	—		1,211,210		400,617		—			1,611,827
Investments in subsidiaries	2,851,571		580,124		—		(3,431,695		)	—
Intercompany debt receivable	—		86,409		24,701		(111,110		)	—
Goodwill	—		412,638		52,516		—			465,154
Permits and other intangibles, net	—		435,594		63,127		—			498,721
Other long-term assets	2,446		7,582		4,387		(1,068		)	13,347
Total assets	$	3,108,867	$	3,895,773	$	842,494	$	(4,165,214	)	$	3,681,920
Liabilities and Stockholders’ Equity:
Current liabilities	$	21,805	$	366,831	$	133,145	$	(17,113	)	$	504,668
Intercompany payables	365,848		237,058		1,322		(604,228		)	—
Closure, post-closure and remedial liabilities, net	—		150,682		15,640		—			166,322
Long-term obligations	1,633,272		—		—		—			1,633,272
Intercompany debt payable	3,701		21,000		86,409		(111,110		)	—
Other long-term liabilities	—		275,649		18,836		(1,068		)	293,417
Total liabilities	2,024,626		1,051,220		255,352		(733,519		)	2,597,679
Stockholders’ equity	1,084,241		2,844,553		587,142		(3,431,695		)	1,084,241
Total liabilities and stockholders’ equity	$	3,108,867	$	3,895,773	$	842,494	$	(4,165,214	)	$	3,681,920

21

Following is the consolidating statement of operations for the three months ended June 30, 2017 (in thousands):

	Clean Harbors, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues
Service revenues	$	—		$	474,801		$	147,924		$	(11,785	)	$	610,940
Product revenues	—			125,859			18,730			(2,741		)	141,848
Total revenues	—			600,660			166,654			(14,526		)	752,788
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	—			306,960			117,181			(11,785		)	412,356
Product cost of revenues	—			98,645			11,543			(2,741		)	107,447
Total cost of revenues	—			405,605			128,724			(14,526		)	519,803
Selling, general and administrative expenses	27			92,504			19,763			—			112,294
Accretion of environmental liabilities	—			2,181			235			—			2,416
Depreciation and amortization	—			51,937			19,594			—			71,531
(Loss) income from operations	(27		)	48,433			(1,662		)	—			46,744
Other expense	(76		)	(406		)	(351		)	—			(833		)
Loss on early extinguishment of debt	(6,045		)	—			—			—			(6,045		)
Gain on sale of business	—			31,722			—			—			31,722
Interest (expense) income	(22,614		)	240			(118		)	—			(22,492		)
Equity in earnings of subsidiaries, net of taxes	43,167			(5,332		)	—			(37,835		)	—
Intercompany interest income (expense)	—			1,268			(1,268		)	—			—
Income (loss) before (benefit) provision for income taxes	14,405			75,925			(3,399		)	(37,835		)	49,096
(Benefit) provision for income taxes	(11,475		)	31,981			2,710			—			23,216
Net income (loss)	25,880			43,944			(6,109		)	(37,835		)	25,880
Other comprehensive income	15,098			15,098			12,837			(27,935		)	15,098
Comprehensive income	$	40,978		$	59,042		$	6,728		$	(65,770	)	$	40,978

22

Following is the consolidating statement of operations for the three months ended June 30, 2016 (in thousands):

	Clean Harbors, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues
Service revenues	$	—		$	456,013		$	139,413		$	(10,864	)	$	584,562
Product revenues	—			95,648			19,391			(2,091		)	112,948
Total revenues	—			551,661			158,804			(12,955		)	697,510
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	(587		)	292,343			107,792			(10,864		)	388,684
Product cost of revenues	—			79,108			14,301			(2,091		)	91,318
Total cost of revenues	(587		)	371,451			122,093			(12,955		)	480,002
Selling, general and administrative expenses	37			83,882			23,144			—			107,063
Accretion of environmental liabilities	—			2,313			235			—			2,548
Depreciation and amortization	—			50,696			22,697			—			73,393
Income (loss) from operations	550			43,319			(9,365		)	—			34,504
Other income (expense)	—			400			(589		)	—			(189		)
Interest (expense) income	(22,962		)	1,284			31			—			(21,647		)
Equity in earnings of subsidiaries, net of taxes	17,413			(9,195		)	—			(8,218		)	—
Intercompany interest income (expense)	—			5,497			(5,497		)	—			—
(Loss) income before (benefit) provision for income taxes	(4,999		)	41,305			(15,420		)	(8,218		)	12,668
(Benefit) provision for income taxes	(8,965		)	23,892			(6,225		)	—			8,702
Net income (loss)	3,966			17,413			(9,195		)	(8,218		)	3,966
Other comprehensive loss	(1,178		)	(1,178		)	(597		)	1,775			(1,178		)
Comprehensive income (loss)	$	2,788		$	16,235		$	(9,792	)	$	(6,443	)	$	2,788

23

Following is the consolidating statement of operations for the six months ended June 30, 2017 (in thousands):

	Clean Harbors, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues
Service revenues	$	—		$	918,106		$	278,995		$	(25,947	)	$	1,171,154
Product revenues	—			242,509			34,061			(5,995		)	270,575
Total revenues	—			1,160,615			313,056			(31,942		)	1,441,729
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	—			601,105			228,285			(25,947		)	803,443
Product cost of revenues	—			195,150			23,790			(5,995		)	212,945
Total cost of revenues	—			796,255			252,075			(31,942		)	1,016,388
Selling, general and administrative expenses	51			184,675			39,789			—			224,515
Accretion of environmental liabilities	—			4,236			470			—			4,706
Depreciation and amortization	—			103,837			40,106			—			143,943
(Loss) income from operations	(51		)	71,612			(19,384		)	—			52,177
Other expense	(222		)	(1,795		)	(365		)	—			(2,382		)
Loss on early extinguishment of debt	(6,045		)	—			—			—			(6,045		)
Gain on sale of business	—			31,722			—			—			31,722
Interest (expense) income	(45,273		)	359			(154		)	—			(45,068		)
Equity in earnings of subsidiaries, net of taxes	35,530			(27,156		)	—			(8,374		)	—
Intercompany interest income (expense)	—			2,565			(2,565		)	—			—
(Loss) income before (benefit) provision for income taxes	(16,061		)	77,307			(22,468		)	(8,374		)	30,404
(Benefit) provision for income taxes	(20,548		)	41,618			4,847			—			25,917
Net income (loss)	4,487			35,689			(27,315		)	(8,374		)	4,487
Other comprehensive income	21,149			21,149			17,869			(39,018		)	21,149
Comprehensive income (loss)	$	25,636		$	56,838		$	(9,446	)	$	(47,392	)	$	25,636

24

Following is the consolidating statement of operations for the six months ended June 30, 2016 (in thousands):

	Clean Harbors, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues
Service revenues	$	—		$	884,490		$	253,436		$	(23,133	)	$	1,114,793
Product revenues	—			185,236			38,104			(4,540		)	218,800
Total revenues	—			1,069,726			291,540			(27,673		)	1,333,593
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	(587		)	575,307			211,083			(23,133		)	762,670
Product cost of revenues	—			158,462			27,689			(4,540		)	181,611
Total cost of revenues	(587		)	733,769			238,772			(27,673		)	944,281
Selling, general and administrative expenses	61			164,537			46,949			—			211,547
Accretion of environmental liabilities	—			4,603			450			—			5,053
Depreciation and amortization	—			99,391			42,904			—			142,295
Income (loss) from operations	526			67,426			(37,535		)	—			30,417
Other income (expense)	—			312			(851		)	—			(539		)
Interest (expense) income	(43,105		)	2,395			83			—			(40,627		)
Equity in earnings of subsidiaries, net of taxes	8,642			(35,690		)	—			27,048			—
Intercompany interest income (expense)	—			10,656			(10,656		)	—			—
(Loss) income before (benefit) provision for income taxes	(33,937		)	45,099			(48,959		)	27,048			(10,749		)
(Benefit) provision for income taxes	(17,032		)	36,457			(13,269		)	—			6,156
Net (loss) income	(16,905		)	8,642			(35,690		)	27,048			(16,905		)
Other comprehensive income	44,659			44,659			28,330			(72,989		)	44,659
Comprehensive income (loss)	$	27,754		$	53,301		$	(7,360	)	$	(45,941	)	$	27,754

25

Following is the condensed consolidating statement of cash flows for the six months ended June 30, 2017 (in thousands):

	Clean Harbors, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Net cash (used in) from operating activities	$	(93,808	)	$	206,496		$	4,243		$	—		$	116,931
Cash flows from (used in) investing activities:
Additions to property, plant and equipment	—			(75,152		)	(13,590		)	—			(88,742		)
Proceeds from sales of fixed assets	—			984			1,137			—			2,121
Acquisitions, net of cash acquired	—			(9,277		)	—			—			(9,277		)
Proceeds on sale of businesses, net of transactional costs	—			46,210			181			—			46,391
Additions to intangible assets, including costs to obtain or renew permits	—			(888		)	(351		)	—			(1,239		)
Proceeds from sale of investments	376			—			—			—			376
Intercompany	—			(14,343		)	—			14,343			—
Net cash from (used in) investing activities	376			(52,466		)	(12,623		)	14,343			(50,370		)
Cash flows from (used in) financing activities:
Change in uncashed checks	—			(5,977		)	(2,384		)	—			(8,361		)
Proceeds from exercise of stock options	46			—			—			—			46
Issuance of restricted shares, net of shares remitted	(2,132		)	—			—			—			(2,132		)
Repurchases of common stock	(12,257		)	—			—			—			(12,257		)
Deferred financing costs paid	(4,727		)	—			—			—			(4,727		)
Premiums paid on early extinguishment of debt	(4,665		)	—			—			—			(4,665		)
Principal payment on debt	(296,202		)	—			—			—			(296,202		)
Issuance of senior secured notes, net of discount	399,000			—			—			—			399,000
Intercompany	14,343			—			—			(14,343		)	—
Net cash from (used in) financing activities	93,406			(5,977		)	(2,384		)	(14,343		)	70,702
Effect of exchange rate change on cash	—			—			2,106			—			2,106
(Decrease) increase in cash and cash equivalents	(26		)	148,053			(8,658		)	—			139,369
Cash and cash equivalents, beginning of period	51,417			155,943			99,637			—			306,997
Cash and cash equivalents, end of period	$	51,391		$	303,996		$	90,979		$	—		$	446,366

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Following is the condensed consolidating statement of cash flows for the six months ended June 30, 2016 (in thousands):

	Clean Harbors, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Net cash from operating activities	$	42,990		$	65,860		$	11,201		$	—		$	120,051
Cash flows used in investing activities:
Additions to property, plant and equipment	—			(105,175		)	(18,354		)	—			(123,529		)
Proceeds from sales of fixed assets	—			694			1,974			—			2,668
Acquisitions, net of cash acquired	—			(48,989		)	(10,000		)	—			(58,989		)
Additions to intangible assets, including costs to obtain or renew permits	—			(908		)	(65		)	—			(973		)
Purchases of available-for-sale securities	(102		)	—			(496		)	—			(598		)
Intercompany	—			(11,827		)	—			11,827			—
Investment in subsidiaries	(250,625		)	—			—			250,625			—
Net cash used in investing activities	(250,727		)	(166,205		)	(26,941		)	262,452			(181,421		)
Cash flows from (used in) financing activities:
Change in uncashed checks	—			(9,266		)	(1,756		)	—			(11,022		)
Proceeds from exercise of stock options	184			—			—			—			184
Issuance of restricted shares, net of shares remitted	(1,879		)	—			—			—			(1,879		)
Repurchases of common stock	(10,134		)	—			—			—			(10,134		)
Excess tax benefit of stock-based compensation	2			—			—			—			2
Deferred financing costs paid	(2,614		)	—			—			—			(2,614		)
Issuance of senior unsecured notes, including premium	250,625			250,625			—			(250,625		)	250,625
Intercompany	11,827			—			—			(11,827		)	—
Net cash from (used in) financing activities	248,011			241,359			(1,756		)	(262,452		)	225,162
Effect of exchange rate change on cash	—			—			4,423			—			4,423
Increase (decrease) in cash and cash equivalents	40,274			141,014			(13,073		)	—			168,215
Cash and cash equivalents, beginning of period	11,017			83,479			90,212			—			184,708
Cash and cash equivalents, end of period	$	51,291		$	224,493		$	77,139		$	—		$	352,923

(19) SUBSEQUENT EVENTS

On July 14, 2017, the Company acquired Lonestar West Inc. ("Lonestar"), a public company headquartered in Alberta, Canada, for approximately CAD $43.0 million ($34.0 million USD) in cash which includes an equity payout of CAD $0.72 per share to Lonestar shareholders and the assumption of approximately CAD $22.0 million ($17.4 million USD) in outstanding debt, which Clean Harbors subsequently repaid. Due to the timing of the acquisition of Lonestar, preliminary opening balance sheet amounts and purchase accounting adjustments are still being prepared and the purchase price is subject to customary post-closing adjustments. The acquisition will accelerate the Company's growth in the daylighting and hydro excavation services markets. In addition to increasing the size of the Company's hydro vac fleet, Lonestar’s network of locations will provide the Company with direct access to key geographic markets in both the United States and Canada. The acquired company will be included in the Industrial and Field Services segment.

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ITEM 2.MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Forward-Looking Statements

In addition to historical information, this Quarterly Report on Form 10-Q contains forward-looking statements, which are generally identifiable by use of the words “believes,” “expects,” “intends,” “anticipates,” “plans to,” “estimates,” “projects,” or similar expressions. These forward-looking statements are subject to certain risks and uncertainties that could cause actual results to differ materially from those reflected in these forward-looking statements. Factors that might cause such a difference include, but are not limited to, those discussed under Item 1A, “Risk Factors,” in our Annual Report on Form 10-K filed with the Securities and Exchange Commission on February 22, 2017, under Item 1A, “Risk Factors,” included in Part II—Other Information in this report, and in other documents we file from time to time with the SEC.  Readers are cautioned not to place undue reliance on these forward-looking statements, which reflect management’s opinions only as of the date hereof. We undertake no obligation to revise or publicly release the results of any revision to these forward-looking statements.

Overview

We are North America’s leading provider of environmental, energy and industrial services. We believe we operate, in the aggregate, the largest number of hazardous waste incinerators, landfills and treatment, storage and disposal facilities ("TSDFs") in North America. We serve a diverse customer base, including Fortune 500 companies, across the chemical, energy, manufacturing and additional markets, as well as numerous government agencies. These customers rely on us to deliver a broad range of services including but not limited to end-to-end hazardous waste management, emergency spill response, industrial cleaning and maintenance, and recycling services. We are also the largest re-refiner and recycler of used oil in the world and the largest provider of parts cleaning and related environmental services to commercial, industrial and automotive customers in North America.

Performance of our segments is evaluated on several factors of which the primary financial measure is Adjusted EBITDA as described more fully below. The following is a discussion of how management evaluates its segments in regards to other factors including key performance indicators that management uses to assess the segments’ results, as well as certain macroeconomic trends and influences that impact each reportable segment:

• Technical Services - Technical Services segment results are predicated upon the demand by our customers for waste services directly attributable to waste volumes generated by them and project work contracted by our Technical Services segment and/or other segments for which waste handling and/or disposal is required. In managing the business and evaluating performance, management tracks the volumes of waste handled and disposed of through our owned incinerators and landfills as well as the utilization of such incinerators. Levels of activity and ultimate performance associated with this segment can be impacted by inherent seasonality in the business and weather conditions, market conditions and overall U.S. GDP and U.S. industrial production, efficiency of our operations, competition and market pricing of our services and the management of our related operating costs.

• Industrial and Field Services - Industrial and Field Services segment results are impacted by the demand for planned and unplanned industrial related cleaning and maintenance services at customer sites and the requirement for environmental cleanup services on a scheduled or emergency basis, including response to national events such as major oil spills, natural disasters or other events where immediate and specialized services are pertinent. Management considers the number of plant sites where services are contracted and expected site turnaround schedules to be indicators of the business’ performance along with the existence of local or national events.

• Safety-Kleen - Safety-Kleen segment results are significantly impacted by the overall market pricing and product mix associated with base and blended oil products and, more specifically, the market prices of Group II base oils, which historically have correlated with overall crude oil prices. Costs incurred in connection with the collection of used oils, which are raw materials associated with the segment’s products, can also be volatile. Starting in 2015, we began charging for collection of used oils, which has allowed us to more effectively manage the profit spreads inherent in the business. The implementation of our OilPlus^TM closed loop initiative resulting in the sale of our renewable oil products directly to our end customers will also impact future operating results. In addition, this segment's results are also impacted by the number of parts washers serviced by the business and the ability to attract small quantity waste producers as customers and integrate them into the Clean Harbors waste network.

• Oil, Gas and Lodging Services - Oil, Gas and Lodging Services segment results are dependent upon levels of oil and gas related exploration, drilling and refining activity in North America. The levels of such exploration, drilling and

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refining activity are largely dependent upon the number of oil rigs in operation, which also drives the demand and related pricing for lodging and camp accommodations. In addition, global and North American crude oil prices on which such activity levels are strongly predicated have significantly declined since a high of $106.57 in 2013 to a low of $30.32 in the beginning of 2016. In the six months ended June 30, 2017, crude oil prices averaged $50.00. This oil price volatility and uncertainty relative to future prices has resulted in lower customer spending and activity levels which have negatively impacted the business’ results. To mitigate the decrease in demand experienced in the manufacturing operation of our lodging business, we have targeted more non-traditional markets such as schools, hospitals, and other municipal structures to offer our modular unit accommodations and related services. The majority of the segment's operations are in Canada, and therefore the impact of US to Canadian dollar foreign currency translation also significantly impacts the segment's results.

Highlights

Total revenues for the three and six months ended June 30, 2017 were $752.8 million and $1.4 billion compared with $697.5 million and $1.3 billion in the three and six months ended June 30, 2016. In the three and six months ended June 30, 2017, our Safety-Kleen segment increased direct revenues 9.1% and 13.8%, respectively, from the comparable periods in 2016, as a result of incremental revenues generated from recent acquisitions, improved pricing conditions related to our renewable oil products, continued organic growth related to our Safety-Kleen Environmental services business and recent success from the implementation of our OilPlus^TM closed loop initiative. In the three and six months ended June 30, 2017, our Technical Services segment increased direct revenues 11.1% and 8.9% from the comparable periods in 2016 primarily related to increased revenues associated with higher waste volumes disposed of in our network, including our new hazardous waste incinerator at our El Dorado, Arkansas site. On June 30, 2017, we completed the sale of our Transformer Services business, as part of our continuous focus on improving or divesting certain non-core operations. Because the disposition occurred on the final day of the second quarter, the results associated with this business are comparable for the periods discussed hereafter.

We reported income from operations for the three and six months ended June 30, 2017 of $46.7 million and $52.2 million, respectively, compared with $34.5 million and $30.4 million in the three and six months ended June 30, 2016. We reported net income for the three and six months ended June 30, 2017 of $25.9 million and $4.5 million, respectively, compared with net income of $4.0 million and a net loss of $16.9 million in the three and six months ended June 30, 2016. Adjusted EBITDA, which is the primary financial measure by which our segments are evaluated, increased9.3% to $120.7 million in the three months ended June 30, 2017 from $110.4 million in the three months ended June 30, 2016 and increased13.0% to $200.8 million in the six months ended June 30, 2017 from $177.8 million in the six months ended June 30, 2016. For the three months ended June 30, 2017, Adjusted EBITDA for all of our segments increased from the comparable period in 2016. Additional information, including a reconciliation of Adjusted EBITDA to net income (loss), appears below under the heading "Adjusted EBITDA."

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Segment Performance

The primary financial measure by which we evaluate the performance of our segments is Adjusted EBITDA. The following table sets forth certain financial information associated with our results of operations for the three and six months ended June 30, 2017 and 2016 (in thousands).

	Summary of Operations (in thousands)
	For the Three Months Ended										For the Six Months Ended
	June 30, 2017			June 30, 2016			$ Change			% Change	June 30, 2017			June 30, 2016			$ Change			% Change
Direct Revenues(1):
Technical Services	$	294,896		$	265,375		$	29,521		11.1%	$	565,880		$	519,712		$	46,168		8.9%
Industrial and Field Services	158,699			156,416			2,283			1.5	284,001			279,915			4,086			1.5
Safety-Kleen	271,315			248,624			22,691			9.1	532,150			467,430			64,720			13.8
Oil, Gas and Lodging Services	27,995			26,375			1,620			6.1	60,605			65,882			(5,277		)	(8.0)
Corporate Items	(117		)	720			(837		)	(116.3)	(907		)	654			(1,561		)	(238.7)
Total	752,788			697,510			55,278			7.9	1,441,729			1,333,593			108,136			8.1
Cost of Revenues(2):
Technical Services	200,096			176,908			23,188			13.1	391,219			350,954			40,265			11.5
Industrial and Field Services	122,463			120,456			2,007			1.7	229,949			227,748			2,201			1.0
Safety-Kleen	172,684			160,598			12,086			7.5	344,433			308,027			36,406			11.8
Oil, Gas and Lodging Services	24,483			24,167			316			1.3	53,735			58,322			(4,587		)	(7.9)
Corporate Items	77			(2,127		)	2,204			103.6	(2,948		)	(770		)	(2,178		)	(282.9)
Total	519,803			480,002			39,801			8.3	1,016,388			944,281			72,107			7.6
Selling, General & Administrative Expenses:
Technical Services	21,720			19,576			2,144			11.0	43,094			39,469			3,625			9.2
Industrial and Field Services	14,752			16,000			(1,248		)	(7.8)	30,655			31,774			(1,119		)	(3.5)
Safety-Kleen	38,350			32,792			5,558			16.9	75,068			64,114			10,954			17.1
Oil, Gas and Lodging Services	3,244			3,407			(163		)	(4.8)	6,812			7,449			(637		)	(8.6)
Corporate Items	34,228			35,288			(1,060		)	(3.0)	68,886			68,741			145			0.2
Total	112,294			107,063			5,231			4.9	224,515			211,547			12,968			6.1
Adjusted EBITDA:
Technical Services	73,080			68,891			4,189			6.1	131,567			129,289			2,278			1.8
Industrial and Field Services	21,484			19,960			1,524			7.6	23,397			20,393			3,004			14.7
Safety-Kleen	60,281			55,234			5,047			9.1	112,649			95,289			17,360			18.2
Oil, Gas and Lodging Services	268			(1,199		)	1,467			122.4	58			111			(53		)	(47.7)
Corporate Items	(34,422		)	(32,441		)	(1,981		)	(6.1)	(66,845		)	(67,317		)	472			0.7
Total	$	120,691		$	110,445		$	10,246		9.3%	$	200,826		$	177,765		$	23,061		13.0%

______________________

1. Direct revenue is revenue allocated to the segment performing the provided service.

2. Cost of revenue is shown exclusive of items presented separately on the statements of operations which consist of (i) accretion of environmental liabilities and (ii) depreciation and amortization.

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Direct Revenues

There are many factors which have impacted and continue to impact our revenues. These factors include, but are not limited to: overall industrial activity and growth in North America, existence of large scale environmental waste and remediation projects, general conditions of the energy related industries, competitive industry pricing, the effects of fuel prices on our fuel recovery fees, acquisitions, the level of emergency response projects and foreign currency translation. In addition, customer efforts to minimalize hazardous waste and changes in regulation can also impact our revenues.

Technical Services

	For the Three Months Ended								For the Six Months Ended
	June 30,				2017 over 2016				June 30,				2017 over 2016
	2017		2016		$ Change		% Change		2017		2016		$ Change		% Change
Direct revenues	$	294,896	$	265,375	$	29,521	11.1	%	$	565,880	$	519,712	$	46,168	8.9	%

Technical Services direct revenues for the three months ended June 30, 2017increased$29.5 million from the comparable period in 2016 primarily due to increased revenues associated with higher waste volumes disposed of in our incinerators and landfills as a result of higher industrial related waste projects. For the three months ended June 30, 2017, landfill volumes increased 22.6% from the comparable period in 2016. The utilization rate at our incinerators was 86.9% on a practical capacity of 561,721 tons for the three months ended June 30, 2017, compared with 88.1% on a practical capacity of 491,721 tons in the comparable period of 2016. The increase in practical capacity was the result of the addition of our state-of-the-art hazardous waste incinerator at our El Dorado, Arkansas site, which came online in the first quarter of 2017 and adds 70,000 tons of additional capacity to our network.

Technical Services direct revenues for the six months ended June 30, 2017increased$46.2 million from the comparable period in 2016 primarily due to increased revenues associated with higher waste volumes disposed of in our incinerators, partially offset by lower waste volumes disposed of in our landfills. For the six months ended June 30, 2017, landfill volumes decreased 2.2% from the comparable period in 2016. The utilization rate at our incinerators was 83.1% on a practical capacity of 561,721 tons for the six months ended June 30, 2017, compared with 87.3% on a practical capacity of 491,721 tons in the comparable period of 2016.

Industrial and Field Services

	For the Three Months Ended								For the Six Months Ended
	June 30,				2017 over 2016				June 30,				2017 over 2016
	2017		2016		$ Change		% Change		2017		2016		$ Change		% Change
Direct revenues	$	158,699	$	156,416	$	2,283	1.5	%	$	284,001	$	279,915	$	4,086	1.5	%

Industrial and Field Services direct revenues for the three and six months ended June 30, 2017increased$2.3 million and $4.1 million from the comparable period in 2016. Included in the three and six months ended June 30, 2016 results was $19.3 million and $30.0 million of direct revenues from our Catalyst Services business, which we sold on September 1, 2016. Excluding those direct revenues Industrial and Field Services direct revenues for the three and six months ended June 30, 2017increased $21.6 million and $34.1 million, respectively, primarily due to increased turnaround work in Western Canada and overall greater levels of project work within the industrial services business resulting in an increase to direct revenues of $15.8 million and $23.5 million, respectively. Our field services business, which has benefited from opening new locations at existing sites used by our other operating segments and increased overall demand for services, increased direct revenues in the three and six months ended June 30, 2017 $5.5 million and $13.9 million, respectively.

Safety-Kleen

	For the Three Months Ended								For the Six Months Ended
	June 30,				2017 over 2016				June 30,				2017 over 2016
	2017		2016		$ Change		% Change		2017		2016		$ Change		% Change
Direct revenues	$	271,315	$	248,624	$	22,691	9.1	%	$	532,150	$	467,430	$	64,720	13.8	%

Safety-Kleen direct revenues for the three months ended June 30, 2017increased$22.7 million from the comparable period in 2016 primarily from more favorable pricing and increases from acquisitions. Increased base and blended oil volumes from acquisitions and pricing accounted for $22.6 million of incremental direct revenue from the comparable period in 2016. Growth

31

across the rest of the business was offset by lower revenues from collections of used motor oil as prices charged for such services decreased in the current period.

Safety-Kleen direct revenues for the six months ended June 30, 2017increased$64.7 million from the comparable period in 2016 primarily from more favorable pricing, acquisitions and organic growth in the business. Increased base and blended oil volumes from acquisitions and pricing accounted for $35.1 million of incremental direct revenue from the comparable period in 2016. Growth across our other business lines, most notably our used motor oil collection, acquired packaging and blending business and containerized waste services businesses, accounted for $29.7 million of incremental growth from the comparable period in 2016.

Oil, Gas and Lodging Services

	For the Three Months Ended								For the Six Months Ended
	June 30,				2017 over 2016				June 30,				2017 over 2016
	2017		2016		$ Change		% Change		2017		2016		$ Change			% Change
Direct revenues	$	27,995	$	26,375	$	1,620	6.1	%	$	60,605	$	65,882	$	(5,277	)	(8.0	)%

Oil, Gas and Lodging Services direct revenues for the three months ended June 30, 2017increased$1.6 million from the comparable period in 2016 primarily due to increases in average rigs serviced partially offset by decreased manufacturing revenues.

Oil, Gas and Lodging Services direct revenues for the six months ended June 30, 2017decreased$5.3 million from the comparable period in 2016 primarily due to decreased manufacturing revenues and seismic support services partially offset by an increase in average rigs serviced.

Cost of Revenues

We believe that our ability to manage operating costs is important to our ability to remain price competitive. We continue to upgrade the quality and efficiency of our services through the development of new technology and continued modifications at our facilities, invest in new business opportunities and aggressively implement strategic sourcing and logistics solutions as well as other cost reduction initiatives in an effort to optimize our operating margins.

Technical Services

	For the Three Months Ended										For the Six Months Ended
	June 30,						2017 over 2016				June 30,						2017 over 2016
	2017			2016			$ Change		% Change		2017			2016			$ Change		% Change
Cost of revenues	$	200,096		$	176,908		$	23,188	13.1	%	$	391,219		$	350,954		$	40,265	11.5%
As a % of Direct Revenue	67.9		%	66.7		%			1.2	%	69.1		%	67.5		%			1.6	%

Technical Services cost of revenues for the three and six months ended June 30, 2017increased$23.2 million and $40.3 million from the comparable periods in 2016 primarily due to increases in equipment and supply costs of $7.3 million and $12.7 million, respectively, labor related costs of $5.2 million and $10.4 million, respectively, and transportation, disposal and fuel costs of $6.8 million and $11.3 million, respectively. These increases during the three and six months ended June 30, 2017 were related to higher activity levels during those periods, increases in operating costs associated with the new El Dorado incinerator and continued start-up activities related to our other strategic growth initiatives and resulted in increased costs as a percentage of direct revenues.

Industrial and Field Services

	For the Three Months Ended										For the Six Months Ended
	June 30,						2017 over 2016				June 30,						2017 over 2016
	2017			2016			$ Change		% Change		2017			2016			$ Change		% Change
Cost of revenues	$	122,463		$	120,456		$	2,007	1.7	%	$	229,949		$	227,748		$	2,201	1.0	%
As a % of Direct Revenue	77.2		%	77.0		%			0.2	%	81.0		%	81.4		%			(0.4	)%

Industrial and Field Services cost of revenues for the three months ended June 30, 2017 increased $2.0 million from the comparable period in 2016. Included in the results for the three months ended June 30, 2016 was $15.0 million of cost of revenues from our Catalyst Services business, which we sold on September 1, 2016. Excluding those costs, Industrial and Field Services cost of revenues for the three months ended June 30, 2017 increased $17.0 million from the comparable period in 2016 primarily due to

32

increases in equipment and supply costs of $8.9 million and labor related costs of $7.2 million resulting from incremental revenues generated during the period.

Industrial and Field Services cost of revenues for the six months ended June 30, 2017increased$2.2 million from the comparable period in 2016. Included in the six months ended June 30, 2016 results was $25.2 million of cost of revenues from our Catalyst Services business, which we sold on September 1, 2016. Excluding those costs, Industrial and Field Services cost of revenues for the six months ended June 30, 2017 increased $27.4 million from the comparable period in 2016 primarily due to increases in equipment and supply costs of $11.3 million, labor related costs of $11.0 million, transportation, disposal and fuel costs of $1.6 million and an additional $3.5 million spread across various expense categories as a result of incremental revenues generated during the period.

Safety-Kleen

	For the Three Months Ended										For the Six Months Ended
	June 30,						2017 over 2016				June 30,						2017 over 2016
	2017			2016			$ Change		% Change		2017			2016			$ Change		% Change
Cost of revenues	$	172,684		$	160,598		$	12,086	7.5	%	$	344,433		$	308,027		$	36,406	11.8	%
As a % of Direct Revenue	63.6		%	64.6		%			(1.0	)%	64.7		%	65.9		%			(1.2	)%

Safety-Kleen cost of revenues for the three months ended June 30, 2017increased$12.1 million from the comparable period in 2016 primarily due to increases in labor related costs of $4.7 million, transportation, disposal and fuel costs of $3.5 million and equipment and supply costs of $3.1 million. As a percentage of direct revenues, these costs decreased 1.0% primarily as a result of greater direct revenue levels being achieved partially offset by higher maintenance costs in the re-refinery network.

Safety-Kleen cost of revenues for the six months ended June 30, 2017increased$36.4 million from the comparable period in 2016 primarily due to increases in equipment and supply costs of $12.2 million, labor related costs of $9.1 million, transportation, disposal and fuel costs of $5.5 million and an additional $9.6 million spread across various expense categories. As a percentage of direct revenues, these costs decreased 1.2% primarily as a result of greater direct revenue levels being achieved partially offset by higher maintenance costs in the re-refinery network.

Oil, Gas and Lodging Services

	For the Three Months Ended										For the Six Months Ended
	June 30,						2017 over 2016				June 30,						2017 over 2016
	2017			2016			$ Change		% Change		2017			2016			$ Change			% Change
Cost of revenues	$	24,483		$	24,167		$	316	1.3	%	$	53,735		$	58,322		$	(4,587	)	(7.9	)%
As a % of Direct Revenue	87.5		%	91.6		%			(4.1	)%	88.7		%	88.5		%				0.2	%

Oil, Gas and Lodging Services cost of revenues for the three months ended June 30, 2017 remained flat from the comparable period in 2016. As a percentage of direct revenues, these costs decreased 4.1% primarily as a result of greater direct revenue levels being achieved while maintaining the businesses cost structure.

Oil, Gas and Lodging Services cost of revenues for the six months ended June 30, 2017decreased$4.6 million from the comparable period in 2016 primarily due to decreases in supplies and material costs of $4.5 million as the business generated lower direct revenues during the period.

Selling, General and Administrative ("SG&A") Expenses

Selling, General and Administrative expenses represent costs incurred in aspects of our business which are directly attributable to the sale of our services and/or products. We strive to manage such costs commensurate with the overall performance of our segments and corresponding revenue levels. We believe that our ability to properly align these costs with overall business performance is reflective of our strong management of the businesses and further promotes our ability to remain competitive in the marketplace.

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Technical Services

	For the Three Months Ended										For the Six Months Ended
	June 30,						2017 over 2016				June 30,						2017 over 2016
	2017			2016			$ Change		% Change		2017			2016			$ Change		% Change
SG&A	$	21,720		$	19,576		$	2,144	11.0	%	$	43,094		$	39,469		$	3,625	9.2	%
As a % of Direct Revenue	7.4		%	7.4		%			—	%	7.6		%	7.6		%			—	%

Technical Services selling, general and administrative expenses for the three and six months ended June 30, 2017increased$2.1 million and $3.6 million from the comparable periods in 2016 due to increased salaries, benefits and variable compensation of $2.1 million and $2.6 million, respectively. These increases were consistent with the growth of the business during those periods as compared to the comparable periods in 2016.

Industrial and Field Services

	For the Three Months Ended											For the Six Months Ended
	June 30,						2017 over 2016					June 30,						2017 over 2016
	2017			2016			$ Change			% Change		2017			2016			$ Change			% Change
SG&A	$	14,752		$	16,000		$	(1,248	)	(7.8	)%	$	30,655		$	31,774		$	(1,119	)	(3.5	)%
As a % of Direct Revenue	9.3		%	10.2		%				(0.9	)%	10.8		%	11.4		%				(0.6	)%

Industrial and Field Services selling, general and administrative expenses for the three and six months ended June 30, 2017 decreased $1.2 million and $1.1 million from the comparable periods in 2016. Included in the three and six months ended June 30, 2016 results were $1.2 million and $2.5 million, respectively, of selling, general and administrative expenses from our Catalyst Services business, which we sold on September 1, 2016. Excluding those costs, Industrial and Field Services selling, general and administrative expenses for the three and six months ended June 30, 2017 remained consistent from the comparable periods in 2016.

Safety-Kleen

	For the Three Months Ended										For the Six Months Ended
	June 30,						2017 over 2016				June 30,						2017 over 2016
	2017			2016			$ Change		% Change		2017			2016			$ Change		% Change
SG&A	$	38,350		$	32,792		$	5,558	16.9	%	$	75,068		$	64,114		$	10,954	17.1	%
As a % of Direct Revenue	14.1		%	13.2		%			0.9	%	14.1		%	13.7		%			0.4	%

Safety-Kleen selling, general and administrative expenses for the three and six months ended June 30, 2017increased$5.6 million and $11.0 million from the comparable periods in 2016 primarily due to salaries, benefits and variable compensation of $3.2 million and $5.8 million, respectively, and an additional $2.4 million and $5.2 million, respectively, primarily related to costs generated from strategic initiatives in the areas of sales and centralization activities associated with this segment.

Oil and Gas Field Services

	For the Three Months Ended											For the Six Months Ended
	June 30,						2017 over 2016					June 30,						2017 over 2016
	2017			2016			$ Change			% Change		2017			2016			$ Change			% Change
SG&A	$	3,244		$	3,407		$	(163	)	(4.8	)%	$	6,812		$	7,449		$	(637	)	(8.6	)%
As a % of Direct Revenue	11.6		%	12.9		%				(1.3	)%	11.2		%	11.3		%				(0.1	)%

Oil, Gas and Lodging Services selling, general and administrative expenses for the three and six months ended June 30, 2017 remained flat from the comparable period in 2016 as management continues to focus on proper alignment of its costs structure for this business.

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Corporate Items

	For the Three Months Ended									For the Six Months Ended
	June 30,				2017 over 2016					June 30,				2017 over 2016
	2017		2016		$ Change			% Change		2017		2016		$ Change		% Change
SG&A	$	34,228	$	35,288	$	(1,060	)	(3.0	)%	$	68,886	$	68,741	$	145	0.2	%

Corporate Items selling, general and administrative expenses for the three months ended June 30, 2017decreased$1.1 million from the comparable period in 2016 primarily due to a decrease in professional fees of $0.6 million and insurance related costs of $0.4 million.

Corporate Items selling, general and administrative expenses for the six months ended June 30, 2017increased$0.1 million from the comparable period in 2016 primarily due to an increase to variable compensation of $2.2 million partially offset by a decrease in severance costs of $2.0 million.

Adjusted Earnings Before Interest, Taxes, Depreciation and Amortization (“Adjusted EBITDA”)

Management considers Adjusted EBITDA to be a measurement of performance which provides useful information to both management and investors. Adjusted EBITDA should not be considered an alternative to net income or other measurements under generally accepted accounting principles ("GAAP"). Adjusted EBITDA is not calculated identically by all companies, and therefore our measurements of Adjusted EBITDA, while defined consistently and in accordance with our existing credit agreement, may not be comparable to similarly titled measures reported by other companies.

	For the Three Months Ended										For the Six Months Ended
	June 30, 2017			June 30, 2016			$ Change			% Change	June 30, 2017			June 30, 2016			$ Change			% Change
Adjusted EBITDA:
Technical Services	$	73,080		$	68,891		$	4,189		6.1%	$	131,567		$	129,289		$	2,278		1.8%
Industrial and Field Services	21,484			19,960			1,524			7.6	23,397			20,393			3,004			14.7
Safety-Kleen	60,281			55,234			5,047			9.1	112,649			95,289			17,360			18.2
Oil, Gas and Lodging Services	268			(1,199		)	1,467			122.4	58			111			(53		)	(47.7)
Corporate Items	(34,422		)	(32,441		)	(1,981		)	(6.1)	(66,845		)	(67,317		)	472			0.7
Total	$	120,691		$	110,445		$	10,246		9.3%	$	200,826		$	177,765		$	23,061		13.0%

We use Adjusted EBITDA to enhance our understanding of our operating performance, which represents our views concerning our performance in the ordinary, ongoing and customary course of our operations. We historically have found it helpful, and believe that investors have found it helpful, to consider an operating measure that excludes certain expenses relating to transactions not reflective of our core operations.

The information about our operating performance provided by this financial measure is used by our management for a variety of purposes. We regularly communicate Adjusted EBITDA results to our lenders since our loan covenants are based upon levels of Adjusted EBITDA achieved and to our board of directors and discuss with the board our interpretation of such results. We also compare our Adjusted EBITDA performance against internal targets as a key factor in determining cash and equity bonus compensation for executives and other employees, largely because we believe that this measure is indicative of how the fundamental business is performing and is being managed.

We also provide information relating to our Adjusted EBITDA so that analysts, investors and other interested persons have the same data that we use to assess our core operating performance. We believe that Adjusted EBITDA should be viewed only as a supplement to the GAAP financial information. We also believe, however, that providing this information in addition to, and together with, GAAP financial information permits the foregoing persons to obtain a better understanding of our core operating performance and to evaluate the efficacy of the methodology and information used by management to evaluate and measure such performance on a standalone and a comparative basis.

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The following is a reconciliation of net income (loss) to Adjusted EBITDA for the following periods (in thousands):

	For the Three Months Ended					For the Six Months Ended
	June 30,					June 30,
	2017			2016		2017			2016
Net income (loss)	$	25,880		$	3,966	$	4,487		$	(16,905	)
Accretion of environmental liabilities	2,416			2,548		4,706			5,053
Depreciation and amortization	71,531			73,393		143,943			142,295
Other expense	833			189		2,382			539
Loss on early extinguishment of debt	6,045			—		6,045			—
Gain on sale of business	(31,722		)	—		(31,722		)	—
Interest expense, net	22,492			21,647		45,068			40,627
Provision for income taxes	23,216			8,702		25,917			6,156
Adjusted EBITDA	$	120,691		$	110,445	$	200,826		$	177,765

Depreciation and Amortization

	For the Three Months Ended									For the Six Months Ended
	June 30,				2017 over 2016					June 30,				2017 over 2016
	2017		2016		$ Change			% Change		2017		2016		$ Change			% Change
Depreciation of fixed assets and landfill amortization	$	61,839	$	63,456	$	(1,617	)	(2.5	)%	$	125,166	$	122,797	$	2,369		1.9	%
Permits and other intangibles amortization	9,692		9,937		(245		)	(2.5	)	18,777		19,498		(721		)	(3.7	)
Total depreciation and amortization	$	71,531	$	73,393	$	(1,862	)	(2.5	)%	$	143,943	$	142,295	$	1,648		1.2	%

Depreciation and amortization decreased$1.9 million for the three months ended June 30, 2017 from the comparable period in 2016 and increased $1.6 million for the six months ended June 30, 2017 from the comparable period in 2016.

Loss on Early Extinguishment of Debt

	For the Three Months Ended										For the Six Months Ended
	June 30,					2017 over 2016					June 30,					2017 over 2016
	2017			2016		$ Change			% Change		2017			2016		$ Change			% Change
Loss on early extinguishment of debt	$	(6,045	)	$	—	$	(6,045	)	100	%	$	(6,045	)	$	—	$	(6,045	)	100	%

During the second quarter of 2017, we recorded a $6.0 million loss on the early extinguishment of debt in connection with the extinguishment of $296.2 million previously outstanding senior unsecured notes. The loss consisted of $4.6 million paid in excess of par in order to extinguish the debt prior to maturity and non-cash expenses of $1.4 million related to the write-off of unamortized financing costs. For additional information regarding our financing arrangements, see Note 11, "Financing Arrangements" to the accompanying financial statements.

Gain on sale of business

	For the Three Months Ended								For the Six Months Ended
	June 30,				2017 over 2016				June 30,				2017 over 2016
	2017		2016		$ Change		% Change		2017		2016		$ Change		% Change
Gain on sale of business	$	31,722	$	—	$	31,722	100	%	$	31,722	$	—	$	31,722	100	%

During the three and six months ended June 30, 2017, we recorded a $31.7 million gain on the sale of a non-core line of business within our Technical Services operating segment. For additional information regarding this gain on sale of business, see Note 4, "Disposition of Business" to the accompanying financial statements.

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Provision for Income Taxes

	For the Three Months Ended								For the Six Months Ended
	June 30,				2017 over 2016				June 30,				2017 over 2016
	2017		2016		$ Change		% Change		2017		2016		$ Change		% Change
Provision for income taxes	$	23,216	$	8,702	$	14,514	166.8	%	$	25,917	$	6,156	$	19,761	321.0	%

The income tax provision for the three and six months ended June 30, 2017 increased $14.5 million and $19.8 million, respectively, as compared to the comparable period in 2016. The increase in the provision in the three and six months ended June 30, 2017 was due to the increases in taxable income, primarily from the gain on sale of the Transformer Services business. Our effective tax rate for the three and six months ended June 30, 2017 was 47.3% and 85.2%, respectively, compared to 68.7% and 57.3%, respectively, for the same periods in 2016. The variations in the effective income tax rates for the three and six months ended June 30, 2017 as compared to more customary relationships between pre-tax income and the provision for income taxes were primarily due to not recognizing income tax benefits from current operating losses related to certain Canadian entities and in the second quarter of 2017 the tax expense associated with the gain on the sale of the Transformer Services business.

Liquidity and Capital Resources

	Six Months Ended
(in thousands)	June 30, 2017			June 30, 2016
Net cash from operating activities	$	116,931		$	120,051
Net cash used in investing activities	(50,370		)	(181,421		)
Net cash from financing activities	70,702			225,162

Net cash from operating activities

Net cash from operating activities for the six months ended June 30, 2017 was $116.9 million, a decrease of $3.1 million from the comparable period in 2016. The change was primarily due to the interest payment on June 30, 2017 of $6.4 million in connection with the early extinguishment of debt. In 2016, such interest payment was made in the third quarter. The change was also due to an increase in accounts receivable and unbilled accounts receivable as a result of increased incremental revenues during the six month ended June 30, 2017 partially offset by decreases in other current assets.

Net cash used in investing activities

Net cash used in investing activities for the six months ended June 30, 2017 was $50.4 million, a decrease of $131.1 million from the comparable period in 2016. The change was primarily driven by a decrease in cash paid for additions to property, plant and equipment, which was greater during the six months ended June 30, 2016 primarily due to the construction of our new hazardous waste incinerator at our El Dorado, Arkansas site which came online in the first quarter of 2017. During the six months ended June 30, 2017, we also had a decrease in cash paid for acquisitions as compared to the six months ended June 30, 2016 and received proceeds of $46.4 million, which consisted of $44.4 million from the sale of our Transformer Services business net of transactional costs and $2.0 million due to finalizing working capital adjustments associated with the sale of our Catalyst Services business. In the last twelve months, we have received proceeds of approximately $93.5 million from divestitures of non-core businesses, including $46.4 million in 2017.

Net cash from financing activities

Net cash from financing activities for the six months ended June 30, 2017 was $70.7 million, compared with net cash from financing activities of $225.2 million for the comparable period in 2016. On June 30, 2017, we entered into a $400.0 million senior secured Credit Agreement and used the proceeds to purchase approximately $296.2 million aggregate principal amount of our previously outstanding 2020 Notes. On March 17, 2016, we completed the issuance of $250.0 million in aggregate principle amount of 5.125% senior unsecured notes due 2021.

AdjustedFree Cash Flow

Management considers adjusted free cash flow to be a measurement of liquidity which provides useful information to both management and investors about our strength and our ability to generate cash. Additionally, adjusted free cash flow is a metric on which management incentive compensation is based. We define adjusted free cash flow as net cash from operating activities excluding cash impacts of items derived from non-operating activities, such as taxes paid in connection with divestitures less additions to property, plant and equipment plus proceeds from sales of fixed assets. Adjusted free cash flow should not be considered

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an alternative to net cash from operating activities or other measurements under GAAP. Adjusted free cash flow is not calculated identically by all companies, and therefore our measurements of adjusted free cash flow may not be comparable to similarly titled measures reported by other companies.

The following is a reconciliation from net cash from operating activities to adjusted free cash flow for the following periods (in thousands):

	Six Months Ended
	June 30,
	2017			2016
Net cash from operating activities	$	116,931		$	120,051
Additions to property, plant and equipment	(88,742		)	(123,529		)
Proceeds from sales of fixed assets	2,121			2,668
Adjusted free cash flow	$	30,310		$	(810	)

Working Capital

At June 30, 2017, cash and cash equivalents totaled $446.4 million, compared to $307.0 million at December 31, 2016. At June 30, 2017, cash and cash equivalents held by our foreign subsidiaries totaled $50.8 million and were readily convertible into other foreign currencies including U.S. dollars. At June 30, 2017, the cash and cash equivalent balance for our U.S. operations was $395.5 million, and our U.S. operations had net operating cash flow of $108.9 million for the six months ended June 30, 2017. Additionally, we have a $400.0 million revolving credit facility of which approximately $225.3 million was available to borrow at June 30, 2017. Based on the above and on our current plans, we believe that our U.S. operations have and will continue to have adequate financial resources to satisfy their liquidity needs without being required to repatriate earnings from foreign subsidiaries. We also believe that cash held by our foreign subsidiaries will be required to fund those foreign operations. Accordingly, although repatriation to the U.S. of foreign earnings would generally be subject to U.S. income taxation, net of any available foreign tax credits, we have not recorded any deferred tax liability related to such repatriation since we intend to permanently reinvest foreign earnings outside the U.S. On July 14, 2017, we acquired Lonestar West Inc. ("Lonestar"), a public company headquartered in Alberta, Canada, for approximately CAD $43.0 million ($34.0 million USD) in cash and subject to customary post-closing adjustments.

We assess our liquidity in terms of our ability to generate cash to fund our operating, investing, and financing activities. Our primary ongoing cash requirements will be to fund operations, capital expenditures, interest payments and investments in line with our business strategy. We believe our future operating cash flows will be sufficient to meet our future operating and internal investing cash needs as well as any cash needs relating to our stock repurchase program. Furthermore, our existing cash balance and the availability of additional borrowings under our revolving credit facility provide additional potential sources of liquidity should they be required.

Financing Arrangements

The financing arrangements and principal terms of our $503.8 million principal amount of 5.25% senior unsecured notes due 2020, $845.0 million principal amount of 5.125% senior unsecured notes due 2021 and $400.0 million senior secured notes due 2024 which were outstanding at June 30, 2017, and our $400.0 million revolving credit facility, are discussed further in Note 11, “Financing Arrangements,” to our consolidated financial statements included herein.

As of June 30, 2017, we were in compliance with the covenants of all of our debt agreements, and we believe it is reasonably likely that we will continue to meet such covenants.

On August 1, 2017, we redeemed approximately $103.8 million aggregate principal amount of 2020 Notes paid through the remaining net proceeds of the Term Loan financing plus available cash.

Common Stock Repurchase Program

On March 13, 2015, our board of directors authorized the repurchase of up to $300 million of our common stock. We have funded and intend to continue to fund the repurchases through available cash resources. The repurchase program authorizes us to purchase our common stock on the open market from time to time in a manner that complies with applicable U.S. securities laws. The number of shares purchased and the timing of the purchases has depended and will depend on a number of factors including share price, cash required for business plans, trading volume and other conditions. We have no obligation to repurchase stock under this program and may suspend or terminate the program at any time. During the three and six months ended June 30, 2017, we repurchased and retired a total of 0.1 million shares and 0.2 million shares, respectively, of our common stock for a total cost of $5.5 million and $12.3 million, respectively. During the three and six months ended June 30, 2016, we repurchased and retired a total of

38

0.1 million shares and 0.2 million shares, respectively, of our common stock for a total cost of $5.1 million and $10.1 million, respectively. Through June 30, 2017, we have repurchased and retired a total of 4.1 million shares of our common stock for a total cost of $212.1 million under this program. As of June 30, 2017, an additional $87.9 million remains available for repurchase of shares under the current authorized program.

Environmental Liabilities

(in thousands)	June 30, 2017		December 31, 2016		$ Change			% Change
Closure and post-closure liabilities	$	59,793	$	58,331	$	1,462		2.5	%
Remedial liabilities	126,159		128,007		(1,848		)	(1.4	)
Total environmental liabilities	$	185,952	$	186,338	$	(386	)	(0.2	)%

Total environmental liabilities as of June 30, 2017 were $186.0 million, a decrease of $0.4 million, compared to the liabilities as of December 31, 2016 primarily due to expenditures of $6.1 million and an adjustment related to the disposition of a business of $1.2 million partially offset by accretion of $4.7 million as well as new asset retirement obligations and measurement period adjustments associated with prior period acquisitions of $2.0 million.

We anticipate our environmental liabilities, substantially all of which we assumed in connection with our acquisitions, will be payable over many years and that cash flow from operations will generally be sufficient to fund the payment of such liabilities when required. However, events not anticipated (such as future changes in environmental laws and regulations) could require that such payments be made earlier or in greater amounts than currently anticipated, which could adversely affect our results of operations, cash flow and financial condition.

Capital Expenditures

We anticipate that 2017 capital spending, net of disposals, will be in the range of $160.0 million to $170.0 million. However, changes in environmental regulations or unscheduled capital needs could require us to make significant capital expenditures for our facilities and adversely affect our results of operations and cash flow.

Critical Accounting Policies and Estimates

Other than described below, there were no material changes in the first six months of 2017 to the information provided under the heading “Critical Accounting Policies and Estimates” included in our Annual Report on Form 10-K for the year ended December 31, 2016.

Goodwill. Goodwill is not amortized but is reviewed for impairment annually as of December 31 or when events or changes in the business environment indicate the carrying value of the reporting unit may exceed its fair value. This review is performed by comparing the fair value of each reporting unit to its carrying value, including goodwill. If the fair value is less than the carrying amount, a Step II analysis of the fair value of all the elements of the reporting unit is performed to determine if and to what degree goodwill is impaired. The loss, if any, is measured as the excess of the carrying value of the goodwill over the value of the goodwill implied by the results of the Step II analysis.

We determine our reporting units by identifying the components of each operating segment, and then in some circumstances aggregate components having similar economic characteristics based on quantitative and/or qualitative factors. We have determined that, as of both December 31, 2016 and June 30, 2017, we have seven reporting units. Our Technical Services, Industrial Services, Field Services, Kleen Performance Products, SK Environmental Services, Oil and Gas Field Services and Lodging Services each constitutes a reporting unit. The results of operations for our Industrial Services and Field Services reporting units are included in our Industrial and Field Services segment, the results of operations for our SK Environmental and Kleen Performance Products reporting units are included in our Safety-Kleen segment, and the results of operations for our Oil and Gas Field Services and Lodging Services reporting units are included in our Oil, Gas and Lodging Services segment.

We conducted our annual impairment test of goodwill for all of our reporting units to which goodwill is allocated as of December 31, 2016 and determined that no adjustment to the carrying value of goodwill for any reporting unit was then necessary. In all cases except for our Industrial Services and Kleen Performance Products reporting units, the estimated fair value of each reporting unit significantly exceeded its carrying value. The annual impairment test fair value for all of our reporting units is determined using an income approach (a discounted cash flow analysis) which incorporates several underlying estimates and assumptions with varying degrees of uncertainty. The discounted cash flow analyses include estimated cash flows for a discrete five year future period and for a terminal period thereafter. In all instances, we corroborate our estimated fair values by also considering

39

other factors such as the fair value of comparable companies to businesses contained in our reporting units. As part of the annual test we also perform a reconciliation of the total estimated fair values of all reporting units to our market capitalization.

During the six months ended June 30, 2017, we continued to evaluate the Industrial Services and Kleen Performance Products reporting units’ performance and monitor for events or changes in circumstances which might indicate that the estimated fair values of these reporting units were below their carrying value. No such events or changes in circumstances existed in the three months ended June 30, 2017.

As a result of the sale of the Transformer Services business, we assessed qualitative factors to determine if it was more likely than not the estimated fair value of the remaining Technical Services reporting unit was less than its carrying value. Based on our assessment of these factors, the performance of the Technical Services business to-date relative to budget, and the fact that the estimated fair value of the Technical Services reporting unit significantly exceeded its carrying value at year-end, we noted no indicators of impairment for the remaining Technical Services reporting unit as of June 30, 2017.

Other Long-Lived Assets. As of June 30, 2017, the Oil and Gas Field Services reporting unit had other long-lived assets consisting of: property, plant and equipment, net of $79.0 million and intangible assets of $3.8 million. In consideration of the reporting unit's continued lower than historical results and overall slowdown in the oil and gas related industries, we continue to monitor the carrying value of the segment's long-lived assets and assess the risk of asset impairment. As a result of analyses performed as of June 30, 2017, we concluded that no impairment of intangible or other long-lived assets then existed.

We will continue to evaluate all of our goodwill and other long lived assets impacted by economic downturns in oil and energy related markets in which they operate. If further economic difficulties resulting from depressed oil and gas related pricing and lower overall activity levels continue for a significant foreseeable period of time, impairments may result and be recorded relative to our long-lived assets held by businesses impacted by the oil and gas and industrial related markets.

ITEM 3.QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

There were no material changes in the first six months of 2017 to the information provided under Item 7A. “Quantitative and Qualitative Disclosures about Market Risk” in the Company's Annual Report on Form 10-K for the year ended December 31, 2016.

ITEM 4.CONTROLS AND PROCEDURES

Evaluation of Disclosure Controls and Procedures

Based on an evaluation under the supervision and with the participation of our Chief Executive Officer and Chief Financial Officer, as of the end of the period covered by this Quarterly Report on 10-Q, our Chief Executive Officer and Chief Financial Officer have concluded that our disclosure controls and procedures (as defined under Rule 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”)) were effective as of June 30, 2017 to ensure that information required to be disclosed by us in reports that we file or submit under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in Securities and Exchange Commission rules and forms and is accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer, as appropriate to allow timely decisions regarding required disclosure.

Changes in Internal Control over Financial Reporting

There were no changes in the Company’s internal control over financial reporting identified in connection with the evaluation required by paragraph (d) of Exchange Act Rules 13a-15 or 15d-15 that was conducted during the quarter ending June 30, 2017 that have materially affected, or are reasonably likely to materially affect, the Company’s internal control over financial reporting.

40

CLEAN HARBORS, INC. AND SUBSIDIARIES

PART II—OTHER INFORMATION

ITEM 1.LEGAL PROCEEDINGS

See Note 15, “Commitments and Contingencies,” to the financial statements included in Item 1 of this report, which description is incorporated herein by reference.

ITEM 1A.RISK FACTORS

During the six months ended June 30, 2017, there were no material changes from the risk factors as previously disclosed in Item 1A in the Company's Annual Report on Form 10-K for the year ended December 31, 2016. 

ITEM 2.UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

Common Stock Repurchase Program

The following table provides information with respect to the shares of common stock repurchased by us for the periods indicated.

Period	Total Number of Shares Purchased (1)	Average Price Paid Per Share (2)		Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs	Approximate Dollar Value of Shares that May Yet Be Purchased Under the Plans or Programs (3)
April 1, 2017 through April 30, 2017	9,685	$	55.63	—	$	93,326,988
May 1, 2017 through May 31, 2017	58,765	$	58.44	57,327	$	89,976,396
June 1, 2017 through June 30, 2017	44,769	$	58.07	36,503	$	87,866,072
Total	113,219	$	58.05	93,830	$	87,866,072

______________________

(1) Includes 19,389 shares withheld by us from employees to satisfy employee tax obligations upon vesting of restricted stock units granted to our employees under our long-term equity incentive programs.

(2) The average price paid per share of common stock repurchased under the stock repurchase program includes the commissions paid to brokers.

(3) On March 13, 2015, our board of directors authorized the repurchase of up to $300 million of our common stock. We have funded and intend to fund the repurchases through available cash resources. The stock repurchase program authorizes us to purchase our common stock on the open market from time to time in a manner that complies with applicable U.S. securities laws. The number of shares purchased and the timing of the purchases has depended and will depend on a number of factors, including share price, cash required for business plans, trading volume and other conditions. We have no obligation to repurchase stock under this program and may suspend or terminate the repurchase program at any time.

ITEM 3.DEFAULTS UPON SENIOR SECURITIES

None

ITEM 4.MINE SAFETY DISCLOSURE

Not applicable

ITEM 5.OTHER INFORMATION

None

41

ITEM 6.EXHIBITS

Item No.	Description	Location
31.1	Rule 13a-14a/15d-14(a) Certification of the CEO Alan S. McKim	Filed herewith
31.2	Rule 13a-14a/15d-14(a) Certification of the CFO Michael L. Battles	Filed herewith
32	Section 1350 Certifications	Filed herewith
101	Interactive Data Files Pursuant to Rule 405 of Regulation S-T: Financial statements from the quarterly report on Form 10-Q of Clean Harbors, Inc. for the quarter ended June 30, 2017, formatted in XBRL: (i) Consolidated Balance Sheets, (ii) Unaudited Consolidated Statements of Operations, (iii) Unaudited Consolidated Statements of Comprehensive Income, (iv) Unaudited Consolidated Statements of Cash Flows, (v) Unaudited Consolidated Statements of Stockholders’ Equity, and (vi) Notes to Unaudited Consolidated Financial Statements.	*

_______________________

* Interactive data files are furnished and deemed not filed or part of a registration statement or prospectus for purposes of Sections 11 or 12 of the Securities Act of 1933, as amended, are deemed not filed for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, and otherwise are not subject to liability under those sections.

42

CLEAN HARBORS, INC. AND SUBSIDIARIES

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized. 

		CLEAN HARBORS, INC.
		Registrant
		By:	/s/  ALAN S. MCKIM
			Alan S. McKim
			Chairman, President and Chief Executive Officer
Date:	August 2, 2017
		By:	/s/  MICHAEL L. BATTLES
			Michael L. Battles
			Executive Vice President and Chief Financial Officer
Date:	August 2, 2017

43

EX-31.1

EXHIBIT 31.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER

I, Alan S. McKim, certify that:

1.I have reviewed this Quarterly Report on Form 10-Q of Clean Harbors, Inc.;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

/s/ Alan S. McKim

Alan S. McKim

Chairman, President and Chief Executive Officer

Date: August 2, 2017

EX-31.2

Exhibit 31.2

CERTIFICATION OF CHIEF FINANCIAL OFFICER

I, Michael L. Battles, certify that:

1.I have reviewed this quarterly report on Form 10-Q of Clean Harbors, Inc.;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

/s/ Michael L. Battles

Michael L. Battles

Executive Vice President and Chief Financial Officer

Date: August 2, 2017

EX-32

EXHIBIT 32

CLEAN HARBORS, INC. AND SUBSIDIARIES

CERTIFICATION PURSUANT TO
SECTION 1350, CHAPTER 63 OF TITLE 18, UNITED STATES CODE,
AS ADOPTED PURSUANT TO
SECTION 906 OF THE SARBANES OXLEY ACT OF 2002

Pursuant to 18 U.S.C. §1350, each of the undersigned certifies that, to his knowledge, this Quarterly Report on Form 10-Q for the period ended June 30, 2017 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and the information contained in this report fairly presents, in all material respects, the financial condition and results of operations of Clean Harbors, Inc.

		By:	/s/  ALAN S. MCKIM
			Alan S. McKim
			Chairman, President and Chief Executive Officer
Date:	August 2, 2017
		By:	/s/  MICHAEL L. BATTLES
			Michael L. Battles
			Executive Vice President and Chief Financial Officer
Date:	August 2, 2017

XML

DOCUMENT AND ENTITY INFORMATION - shares	6 Months Ended
	Jun. 30, 2017	Jul. 28, 2017
Document and Entity Information [Abstract]
Entity Registrant Name	CLEAN HARBORS INC
Entity Central Index Key	0000822818
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Jun. 30, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		57,154,060

XML

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 446,366	$ 306,997
Accounts receivable, net of allowances aggregating $26,782 and $29,249, respectively	512,375	496,226
Unbilled accounts receivable	46,576	36,190
Deferred costs	21,054	18,914
Inventories and supplies	172,540	178,428
Prepaid expenses and other current assets	35,823	56,116
Total current assets	1,234,734	1,092,871
Property, plant and equipment, net	1,602,453	1,611,827
Other assets:
Goodwill	472,819	465,154
Permits and other intangibles, net	482,828	498,721
Other	13,448	13,347
Total other assets	969,095	977,222
Total assets	3,806,282	3,681,920
Current liabilities:
Current portion of long-term obligations	107,798	0
Accounts payable	224,218	229,534
Deferred revenue	72,089	64,397
Accrued expenses	191,495	190,721
Current portion of closure, post-closure and remedial liabilities	23,700	20,016
Total current liabilities	619,300	504,668
Other liabilities:
Closure and post-closure liabilities, less current portion of $6,745 and $6,220, respectively	53,048	52,111
Remedial liabilities, less current portion of $16,955 and $13,796, respectively	109,204	114,211
Long-term obligations, less current portion	1,626,505	1,633,272
Deferred taxes, unrecognized tax benefits and other long-term liabilities	297,288	293,417
Total other liabilities	2,086,045	2,093,011
Commitments and contingent liabilities (See Note 15)
Stockholders’ equity:
Authorized 80,000,000; shares issued and outstanding 57,153,687 and 57,297,978 shares, respectively	572	573
Shares held under employee participation plan	0	(469)
Additional paid-in capital	716,712	725,670
Accumulated other comprehensive loss	(193,177)	(214,326)
Accumulated earnings	576,830	572,793
Total stockholders’ equity	1,100,937	1,084,241
Total liabilities and stockholders’ equity	$ 3,806,282	$ 3,681,920

XML

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Account receivable, allowances aggregating	$ 26,782	$ 29,249
Closure and post-closure liabilities, current portion	6,745	6,220
Remedial liabilities, current portion	$ 16,955	$ 13,796
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)	57,153,687	57,297,978
Common stock, outstanding shares (in shares)	57,153,687	57,297,978

XML

UNAUDITED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenues:
Service revenues	$ 610,940	$ 584,562	$ 1,171,154	$ 1,114,793
Product revenues	141,848	112,948	270,575	218,800
Total revenues	752,788	697,510	1,441,729	1,333,593
Cost of revenues (exclusive of items shown separately below)
Service revenues	412,356	388,684	803,443	762,670
Product revenues	107,447	91,318	212,945	181,611
Total cost of revenues	519,803	480,002	1,016,388	944,281
Selling, general and administrative expenses	112,294	107,063	224,515	211,547
Accretion of environmental liabilities	2,416	2,548	4,706	5,053
Depreciation and amortization	71,531	73,393	143,943	142,295
Income from operations	46,744	34,504	52,177	30,417
Other expense	(833)	(189)	(2,382)	(539)
Loss on early extinguishment of debt	(6,045)	0	(6,045)	0
Gain on sale of business	31,722	0	31,722	0
Interest expense, net of interest income of $311, $225, $520 and $375, respectively	(22,492)	(21,647)	(45,068)	(40,627)
Income (loss) before (benefit) provision for income taxes	49,096	12,668	30,404	(10,749)
Provision for income taxes	23,216	8,702	25,917	6,156
Net income (loss)	$ 25,880	$ 3,966	$ 4,487	$ (16,905)
Earnings (loss) per share:
Basic (in USD per share)	$ 0.45	$ 0.07	$ 0.08	$ (0.29)
Diluted (in USD per share)	$ 0.45	$ 0.07	$ 0.08	$ (0.29)
Shares used to compute loss per share - Basic (in shares)	57,190	57,549	57,226	57,599
Shares used to compute loss per share - Diluted (in shares)	57,336	57,678	57,349	57,599

XML

UNAUDITED CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement [Abstract]
Interest expense	$ 311	$ 225	$ 520	$ 375

XML

UNAUDITED CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 25,880	$ 3,966	$ 4,487	$ (16,905)
Other comprehensive income (loss):
Unrealized gains on available-for-sale securities (net of taxes of $20, $0, $122 and $0, respectively)	27	0	159	0
Reclassification adjustment for losses on available-for-sale securities included in net income (loss) (net of taxes of $29, $0, $79 and $0, respectively)	47	0	143	0
Foreign currency translation adjustments	15,024	(1,178)	20,847	44,659
Other comprehensive income (loss)	15,098	(1,178)	21,149	44,659
Comprehensive income	$ 40,978	$ 2,788	$ 25,636	$ 27,754

XML

UNAUDITED CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Unrealized gains (losses) on available-for-sale securities, taxes	$ (20)	$ 0	$ (122)	$ 0
Reclassification adjustment for gains on available-for-sale securities included in net (loss) income taxes	$ (29)	$ 0	$ (79)	$ 0

XML

UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities:
Net income (loss)	$ 4,487	$ (16,905)
Adjustments to reconcile net loss to net cash from operating activities:
Depreciation and amortization	143,943	142,295
Allowance for doubtful accounts	3,580	3,228
Amortization of deferred financing costs and debt discount	1,660	1,772
Accretion of environmental liabilities	4,706	5,053
Changes in environmental liability estimates	(129)	(315)
Deferred income taxes	190	(6,521)
Stock-based compensation	5,172	4,739
Excess tax benefit of stock-based compensation	0	(2)
Net tax deficiency on stock based awards	0	(603)
Other expense	2,382	1,049
Gain on sale of business	(31,722)	0
Loss on early extinguishment of debt	6,045	0
Environmental expenditures	(6,102)	(6,454)
Changes in assets and liabilities, net of acquisitions
Accounts receivable and unbilled accounts receivable	(31,154)	993
Inventories and supplies	(6,307)	(1,113)
Other current assets	13,918	(4,789)
Accounts payable	(2,686)	(8,397)
Other current and long-term liabilities	8,948	6,021
Net cash from operating activities	116,931	120,051
Cash flows used in investing activities:
Additions to property, plant and equipment	(88,742)	(123,529)
Proceeds from sales of fixed assets	2,121	2,668
Acquisitions, net of cash acquired	(9,277)	(58,989)
Proceeds on sale of businesses, net of transactional costs	46,391	0
Additions to intangible assets, including costs to obtain or renew permits	(1,239)	(973)
Purchases of available-for-sale securities	0	(598)
Proceeds from sale of investments	376	0
Net cash used in investing activities	(50,370)	(181,421)
Cash flows from financing activities:
Change in uncashed checks	(8,361)	(11,022)
Proceeds from exercise of stock options	46	184
Issuance of restricted shares, net of shares remitted	(2,132)	(1,879)
Repurchases of common stock	(12,257)	(10,134)
Deferred financing costs paid	(4,727)	(2,614)
Excess tax benefit of stock-based compensation	0	2
Premiums paid on early extinguishment of debt	(4,665)	0
Principal payment on debt	(296,202)	0
Issuance of senior secured notes, net of discount	399,000	0
Issuance of senior unsecured notes, including premium	0	250,625
Net cash from financing activities	70,702	225,162
Effect of exchange rate change on cash	2,106	4,423
Increase in cash and cash equivalents	139,369	168,215
Cash and cash equivalents, beginning of period	306,997	184,708
Cash and cash equivalents, end of period	446,366	352,923
Cash payments for interest and income taxes:
Interest paid	50,432	44,275
Income taxes paid	13,407	23,872
Non-cash investing and financing activities:
Property, plant and equipment accrued	16,213	24,187
Transfer of inventory to property, plant and equipment	$ 12,641	$ 0

XML

UNAUDITED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - 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
Increase (Decrease) in Stockholders' Equity
Cumulative effect of change in accounting for stock based compensation	$ 231			$ 681		$ (450)
Balance at beginning of period at Dec. 31, 2016	1,084,241	$ 573	$ (469)	725,670	$ (214,326)	572,793
Balance beginning of period (in shares) at Dec. 31, 2016		57,298
Increase (Decrease) in Stockholders' Equity
Net income (loss)	4,487					4,487
Other comprehensive income	21,149				21,149
Stock-based compensation	5,172			5,172
Issuance of restricted shares, net of shares remitted	(2,132)	$ 1		(2,133)
Issuance of restricted shares, net of shares remitted (in shares)		93
Shares held under employee participation plan	0	$ 0	469	(469)
Shares held under employee participation plan (in shares)		(25)
Repurchases of common stock	$ (12,257)	$ (2)		(12,255)
Repurchases of common stock (in shares)	(200)	(214)
Exercise of stock options	$ 46			46
Exercise of stock options (in shares)		2
Balance at end of period at Jun. 30, 2017	$ 1,100,937	$ 572	$ 0	$ 716,712	$ (193,177)	$ 576,830
Balance ending of period (in shares) at Jun. 30, 2017		57,154

XML

UNAUDITED CONSOLIDATED STATEMENTS OF STOCKHOLDERS'S EQUITY (Parenthetical) - $ / shares	Jun. 30, 2017	Dec. 31, 2016
Statement of Stockholders' Equity [Abstract]
Common stock, par value (in USD per share)	$ 0.01	$ 0.01

XML

BASIS OF PRESENTATION

6 Months Ended

Jun. 30, 2017

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, 2016, which includes the audited consolidated balance sheet as of December 31, 2016 from which the one presented herein was derived.

XML

SIGNIFICANT ACCOUNTING POLICIES

6 Months Ended

Jun. 30, 2017

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, 2016. There have been no material changes in these policies or their application.

Reclassifications

As disclosed in the Company's Annual Report on Form 10-K for the year ended December 31, 2016, in the fourth quarter of 2016 the Company changed the manner in which it manages its business, makes operating decisions and assesses the Company's performance. The Company's operations are now managed in six operating segments: Technical Services, Industrial Services, Field Services, Safety-Kleen, Oil and Gas Field Services and Lodging Services. For purposes of segment disclosure the Industrial Services and Field Services operating segments have been aggregated into a single reportable segment based upon their similar economic and other characteristics, and the Oil and Gas Field Services and Lodging Services operating segments have been combined as they do not meet the quantitative thresholds for separate presentation. The amounts presented for the three and six months ended June 30, 2016 have been recast to reflect the impact of such changes. These reclassifications and adjustments had no effect on consolidated statements of operations, consolidated statements of comprehensive income, consolidated statements of cash flows or consolidated statements of stockholders' equity for any of the periods presented.

Recent Accounting Pronouncements

Standards implemented

In July 2015, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2015-11, Inventory (Topic 330). The amendment provides guidance regarding the measurement of inventory. Entities should measure inventory within the scope of this update at the lower of cost and net realizable value. The adoption of ASU 2015-11 was applied prospectively and as of January 1, 2017 did not have an impact on the Company's consolidated financial statements.

In March 2016, the FASB issued ASU 2016-09, Compensation-Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting. 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. Stock-based compensation excess tax benefits or deficiencies are now reflected in the Consolidated Statements of Operations as a component of the provision for income taxes, whereas they previously were recognized in equity. Additionally, the Consolidated Statements of Cash Flows now include excess tax benefits as an operating activity. Previously, income tax benefits at settlement of an award were reported as a reduction to operating cash flows and an increase to financing cash flows to the extent that those benefits exceeded the income tax benefits reported in earnings during the award's vesting period. The Company has elected to apply that change in cash flow classification on a prospective basis, leaving previously reported net cash from operating activities and net cash from financing activities in the accompanying consolidated statement of cash flows for the period ended June 30, 2016 unchanged. Finally, the Company has elected to account for forfeitures as they occur, rather than estimate expected forfeitures. As a result of the adoption of this update, the Company recorded a cumulative-effect adjustment that reduced beginning retained earnings by $0.5 million, net of tax.

In August 2016, the 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. The Company early adopted the amendments in the Update on a retrospective basis in the second quarter of fiscal year 2017. As a result of adoption, the Company recorded cash paid in the second quarter for debt prepayment and extinguishment costs as financing activities in the accompanying consolidated statements of cash flows.

Standard to be implemented

In May 2014, FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606). ASU 2014-09 outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry-specific guidance. In August 2015, FASB issued ASU 2015-14 which deferred the effective date of ASU 2014-09 for all entities by one year. In March 2016, FASB issued ASU 2016-08, which 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. In April 2016, FASB issued ASU 2016-10, which 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. In May 2016, FASB issued ASU 2016-12, which provided narrow scope improvements and practical expedients on assessing collectability, presentation of sales taxes, noncash consideration, and completed contracts and contract modifications at transition. ASU 2014-09 is currently effective for annual reporting periods (including interim reporting periods within those periods) beginning after December 15, 2017. The guidance permits two methods of adoption: retrospectively to each prior reporting period presented (full retrospective method), or retrospectively with the cumulative effect of initially applying the guidance recognized at the date of initial application (the cumulative catch-up transition method). The Company expects that it will adopt ASU 2014‑09 beginning in the first quarter of 2018 and continues its evaluation of the impact of the new standard on its accounting policies, disclosures, processes, and system requirements. The Company has assigned internal resources to assist in this implementation project and believes that the project is progressing timely. The Company currently anticipates adopting this ASU using the modified retrospective method. As the Company completes its evaluation of this new standard, the Company's preliminary assessments could change.

In February 2017, the FASB issued ASU 2017-05, Other Income-Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20): Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets. The amendments in this Update are meant to clarify the scope of ASC Subtopic 610-20, Other Income-Gains and Losses from the Derecognition of Nonfinancial Assets and to add guidance for partial sales of nonfinancial assets. The amendments in this Update should be applied using a full retrospective method or a modified retrospective method and are effective at the same time as ASU 2014-09. Further, the Company is required to adopt ASU 2017-05 at the same time that it adopts the guidance in ASU 2014-09. Adoption is not expected to have a material impact on the Company's consolidated financial statements.

In May 2017, the FASB issued ASU 2017-09, Compensation-Stock Compensation (Topic 718): Scope of Modification Accounting. The amendments in this Update are meant to provide guidance about which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting in Topic 718. The amendments in this Update should be applied prospectively to an award modified on or after the adoption date and are effective for annual reporting periods (including interim reporting periods within those periods) beginning after December 15, 2017. Adoption is not expected to have a material impact on the Company's consolidated financial statements.

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BUSINESS COMBINATIONS

6 Months Ended

Jun. 30, 2017

Business Combinations [Abstract]

BUSINESS COMBINATIONS

BUSINESS COMBINATIONS

2017 Acquisitions

On January 31, 2017, the Company acquired a privately held company for a purchase price of approximately $11.9 million in cash, net of cash acquired, and subject to customary post-closing adjustments. The acquired business produces and distributes oil products and therefore complements the Company's closed loop model as it relates to the sale of its oil products. The acquired company is included in the Safety-Kleen operating segment. In connection with this acquisition a preliminary goodwill amount of $4.9 million was recognized.

2016 Acquisitions

During 2016, the Company acquired seven businesses that complement the strategy to create a closed loop model as it relates to the sale of the Company's oil products. These acquisitions provided the Company with three additional oil re-refineries while also expanding its used motor oil collection network and providing greater blending and packaging capabilities. These acquisitions also provided 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 into the Safety-Kleen operating segment with certain operations also being integrated into the Technical Services and Industrial Services operating segments. The combined purchase price for the seven acquisitions was $204.8 million in cash, net of cash acquired. Upon acquisition, the acquired entities were immediately integrated into the Company's operating segments. Therefore it is impracticable to measure earnings attributable to the acquired businesses.

The allocation of the purchase price was based on estimates of the fair value of assets acquired and liabilities assumed as of the acquisition dates. 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 seven acquisitions in the second

quarter of 2017.

The components and allocation of the purchase price consist of the following amounts (in thousands):

	At Acquisition Dates As Reported December 31, 2016			Measurement Period Adjustments			Final Allocations
Accounts receivable	$	15,767		$	475		$	16,242
Inventories and supplies	12,515			173			12,688
Prepaid expenses and other current assets	777			(25		)	752
Property, plant and equipment	143,025			891			143,916
Permits and other intangibles	28,856			—			28,856
Current liabilities	(20,258		)	353			(19,905		)
Closure and post-closure liabilities	(2,408		)	(596		)	(3,004		)
Remedial liabilities, less current portion	(2,041		)	(504		)	(2,545		)
Deferred taxes, unrecognized tax benefits and other long-term liabilities	(17,019		)	(3,200		)	(20,219		)
Total identifiable net assets	159,214			(2,433		)	156,781
Goodwill	45,791			2,186			47,977
Total purchase price, net of cash acquired	$	205,005		$	(247	)	$	204,758

Pro forma revenue and earnings amounts on a combined basis as if these acquisitions had been completed on January 1, 2016 are immaterial to the consolidated financial statements of the Company since that date.

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DISPOSITION OF BUSINESS

6 Months Ended

Jun. 30, 2017

Discontinued Operations and Disposal Groups [Abstract]

DISPOSITION OF BUSINESS

DISPOSITION OF BUSINESS

2017 Disposition

On June 30, 2017, the Company completed the sale of its Transformer Services business, as part of its continuous focus on improving or divesting certain non-core operations. The Transformer Services business was a non-core business previously included within the Technical Services operating segment and has sold for approximately $46.5 million ($44.4 million net of $2.1 million in transactional related costs) subject to customary post-closing conditions. As a result of the sale, the Company recognized during the three and six months ended June 30, 2017, a pre-tax gain of $31.7 million which is included in gain on sale of business in the Company’s consolidated statement of operations.

The following table presents the carrying amounts of the Company's Transformer Services business that was disposed of on June 30, 2017 (in thousands):

	June 30, 2017
Total current assets	$	7,216
Property, plant and equipment, net	8,773
Total other assets	1,681
Total assets divested	$	17,670
Total current liabilities	3,849
Total other liabilities	1,170
Total liabilities divested	$	5,019
Net carrying value divested	$	12,651

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 entity. However, the Company determined that the disposition represented an individually significant component of the Company’s business. The following table presents income attributable to the Transformer Services business included in the Company's consolidated results of operations for each of the periods shown and through its disposition on June 30, 2017 (in thousands):

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2017		2016		2017		2016
Income before provision for income taxes	$	1,873	$	986	$	2,771	$	1,793

2016 Disposition

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. During the first quarter of 2017, the Company and the buyer of the Catalyst Services business agreed to final working capital amounts and as a result the Company received $2.0 million of final sale proceeds.

The following table presents the income before provision for income taxes attributable to the Catalyst Services business included in the Company's consolidated results of operations for three and six months ended June 30, 2016 (in thousands):

	Three Months Ended		Six Months Ended
	June 30, 2016		June 30, 2016
Income before provision for income taxes	$	2,607	$	1,508

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INVENTORIES AND SUPPLIES

6 Months Ended

Jun. 30, 2017

Inventory Disclosure [Abstract]

INVENTORIES AND SUPPLIES

INVENTORIES AND SUPPLIES

Inventories and supplies consisted of the following (in thousands):

	June 30, 2017		December 31, 2016
Oil and oil products	$	57,554	$	52,158
Supplies and drums	92,995		90,610
Solvent and solutions	8,575		8,566
Modular camp accommodations	2,699		15,255
Other	10,717		11,839
Total inventories and supplies	$	172,540	$	178,428

As of June 30, 2017 and December 31, 2016, other inventories consisted primarily of cleaning fluids, such as absorbents and wipers, and automotive fluids, such as windshield washer fluid and antifreeze. During the second quarter of 2017, $12.6 million of modular camp accommodations inventory was transferred to and included as camp equipment within the Company's property, plant and equipment amount as such assets will be utilized in the Company's ongoing camp and lodging operations.

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PROPERTY, PLANT AND EQUIPMENT

6 Months Ended

Jun. 30, 2017

Property, Plant and Equipment [Abstract]

PROPERTY, PLANT AND EQUIPMENT

PROPERTY, PLANT AND EQUIPMENT

Property, plant and equipment consisted of the following (in thousands):

	June 30, 2017		December 31, 2016
Land	$	121,114	$	120,575
Asset retirement costs (non-landfill)	14,861		14,567
Landfill assets	141,878		139,708
Buildings and improvements	406,030		373,160
Camp equipment	168,524		152,740
Vehicles	564,723		541,022
Equipment	1,605,581		1,483,736
Furniture and fixtures	5,524		5,492
Construction in progress	54,934		146,904
	3,083,169		2,977,904
Less - accumulated depreciation and amortization	1,480,716		1,366,077
Total property, plant and equipment, net	$	1,602,453	$	1,611,827

Interest in the amount of $0.1 million and $0.2 million was capitalized to fixed assets during the three and six months ended June 30, 2017, respectively. Interest in the amount of $1.3 million and $2.5 million was capitalized to fixed assets during the three and six months ended June 30, 2016, respectively. Depreciation expense, inclusive of landfill amortization, was $61.8 million and $125.2 million for the three and six months ended June 30, 2017, respectively. Depreciation expense, inclusive of landfill amortization, was $63.5 million and $122.8 million for the three and six months ended June 30, 2016, respectively.

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GOODWILL AND OTHER INTANGIBLE ASSETS

6 Months Ended

Jun. 30, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

GOODWILL AND OTHER INTANGIBLE ASSETS

GOODWILL AND OTHER INTANGIBLE ASSETS

The changes in goodwill by segment for the six months ended June 30, 2017 were as follows (in thousands):

	Technical Services			Industrial & Field Services		Safety-Kleen		Oil, Gas and Lodging Services		Totals
Balance at January 1, 2017	$	61,116		$	107,968	$	296,070	$	—	$	465,154
Increase from current period acquisitions	—			—		4,916		—		4,916
Measurement period adjustments from prior period acquisitions	—			—		2,186		—		2,186
Decrease from disposition of business	(1,300		)	—		—				(1,300		)
Foreign currency translation and other	157			615		1,091		—		1,863
Balance at June 30, 2017	$	59,973		$	108,583	$	304,263	$	—	$	472,819

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, 2016 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 a result of the sale of the Transformer Services business discussed in Note 4, "Disposition of Business," to the accompanying financial statements, the Company assessed qualitative factors to determine whether it was more likely than not that the fair value of the remaining Technical Services reporting unit was less than its carrying value. As a result of its qualitative assessment, the Company noted no indicators of impairment for the remaining Technical Services reporting unit existed as of June 30, 2017.

As of June 30, 2017 and December 31, 2016, the Company's total finite-lived and indefinite-lived intangible assets consisted of the following (in thousands):

	June 30, 2017							December 31, 2016
	Cost		Accumulated Amortization		Net		Weighted Average Remaining Amortization Period (in years)	Cost		Accumulated Amortization		Net		Weighted Average Remaining Amortization Period (in years)
Permits	$	173,174	$	70,698	$	102,476	21.4	$	171,637	$	67,301	$	104,336	18.9
Customer and supplier relationships	395,911		143,038		252,873		11.9	393,426		127,462		265,964		12.2
Other intangible assets	34,673		30,166		4,507		7.5	34,254		28,456		5,798		7.1
Total amortizable permits and other intangible assets	603,758		243,902		359,856		14.5	599,317		223,219		376,098		13.9
Trademarks and trade names	122,972		—		122,972		Indefinite	122,623		—		122,623		Indefinite
Total permits and other intangible assets	$	726,730	$	243,902	$	482,828		$	721,940	$	223,219	$	498,721

Amortization expense of permits and other intangible assets was $9.7 million and $18.8 million for the three and six months ended June 30, 2017, respectively. Amortization expense of permits and other intangible assets was $9.9 million and $19.5 million for the three and six months ended June 30, 2016, respectively.

The expected amortization of the net carrying amount of finite-lived intangible assets at June 30, 2017 was as follows (in thousands):

Years Ending December 31,	Expected Amortization
2017 (six months)	$	18,078
2018	34,091
2019	31,238
2020	28,756
2021	26,557
Thereafter	221,136
	$	359,856

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ACCRUED EXPENSES

6 Months Ended

Jun. 30, 2017

Payables and Accruals [Abstract]

ACCRUED EXPENSES

ACCRUED EXPENSES

Accrued expenses consisted of the following at June 30, 2017 and December 31, 2016 (in thousands):

	June 30, 2017		December 31, 2016
Insurance	$	58,816	$	63,061
Interest	15,006		21,536
Accrued compensation and benefits	45,159		34,641
Income, real estate, sales and other taxes	37,474		35,083
Other	35,040		36,400
	$	191,495	$	190,721

As of June 30, 2017 and December 31, 2016, other accrued expenses included accrued legal matters of $3.1 million and $3.8 million, respectively, and accrued severance charges of $1.8 million and $2.9 million, respectively.

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CLOSURE AND POST-CLOSURE LIABILITIES

6 Months Ended

Jun. 30, 2017

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, 2017 through June 30, 2017 were as follows (in thousands):

	Landfill Retirement Liability			Non-Landfill Retirement Liability			Total
Balance at January 1, 2017	$	30,630		$	27,701		$	58,331
Measurement period adjustments from prior period acquisitions	—			596			596
New asset retirement obligations	894			—			894
Adjustment related to disposition of business	—			(1,170		)	(1,170		)
Accretion	1,094			1,270			2,364
Changes in estimates recorded to statement of operations	—			(262		)	(262		)
Changes in estimates recorded to balance sheet	—			(287		)	(287		)
Expenditures	(556		)	(254		)	(810		)
Currency translation and other	82			55			137
Balance at June 30, 2017	$	32,144		$	27,649		$	59,793

All of the landfill facilities included in the above were active as of June 30, 2017. There were no significant charges (benefits) in 2017 resulting from changes in estimates for closure and post-closure liabilities.

New asset retirement obligations incurred during the first six months of 2017 were discounted at the credit-adjusted risk-free rate of 6.32%.

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REMEDIAL LIABILITIES

6 Months Ended

Jun. 30, 2017

Environmental Remediation Obligations [Abstract]

REMEDIAL LIABILITIES

REMEDIAL LIABILITIES

The changes to remedial liabilities for the six months ended June 30, 2017 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, 2017	$	1,777		$	64,151		$	62,079		$	128,007
Measurement period adjustments from prior period acquisitions	—			—			504			504
Accretion	43			1,332			967			2,342
Changes in estimates recorded to statement of operations	(36		)	(120		)	289			133
Expenditures	(19		)	(2,068		)	(3,205		)	(5,292		)
Currency translation and other	(1		)	2,712			(2,246		)	465
Balance at June 30, 2017	$	1,764		$	66,007		$	58,388		$	126,159

In the six months ended June 30, 2017, there were no significant charges (benefits) resulting from changes in estimates for remedial liabilities.

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FINANCING ARRANGEMENTS

6 Months Ended

Jun. 30, 2017

Debt Disclosure [Abstract]

FINANCING ARRANGEMENTS

FINANCING ARRANGEMENTS

The following table is a summary of the Company’s financing arrangements (in thousands):

	June 30, 2017			December 31, 2016
Senior secured notes due June 30, 2024 ("Term Loan"), current	$	4,000		$	—
Senior unsecured notes, at 5.25%, due August 1, 2020 ("2020 Notes"), current	103,798			—
Current portion of long-term obligations, at carrying value	$	107,798		$	—
Senior secured notes due June 30, 2024	$	396,000		$	—
Senior unsecured notes, at 5.25%, due August 1, 2020	400,000			800,000
Senior unsecured notes, at 5.125%, due June 1, 2021 ("2021 Notes")	845,000			845,000
Long-term obligations	$	1,641,000		$	1,645,000
Unamortized debt issuance costs and debt discount/premium, net	(14,495		)	(11,728		)
Long-term obligations, at carrying value	$	1,626,505		$	1,633,272
Total current and long-term obligations, at carrying value	$	1,734,303		$	1,633,272

On June 30, 2017, the Company, and substantially all of the Company’s domestic subsidiaries as guarantors, entered into a $400.0 million senior secured Credit Agreement (the "Term Loan agreement") with Goldman Sachs Lending Partners LLC, as administrative agent and collateral agent (the “Agent”), and certain other financial institutions. Loans under the Term Loan Agreement will mature on June 30, 2024 and may be prepaid at any time without premium or penalty other than customary breakage costs with respect to Eurodollar based loans or if the Company engages in certain repricing transactions before December 31, 2017, in which event a 1.0% prepayment premium would be due. The Company’s obligations under the Term Loan Agreement are guaranteed by all of the Company’s domestic restricted subsidiaries and secured by liens on substantially all of the assets of the Company and the guarantors.

Borrowings under the Term Loan Agreement will bear interest, at the Company’s election, at either of the following rates: (a) the sum of the Eurodollar Rate (as defined in the Term Loan Agreement) plus 2.00%, or (b) the sum of the Base Rate (as defined in the Term Loan Agreement) plus 1.00%, with the Eurodollar Rate being subject to a floor of 0.00%. The effective interest rate of the Term Loan on June 30, 2017 was 3.23%. The Term Loan Agreement contains representations and warranties, affirmative and negative covenants, and events of default, which the Company believes are usual and customary for an agreement of this type. Such covenants restrict the Company’s ability, among other matters, to incur debt, create liens on the Company’s assets, make restricted payments or investments or enter into transactions with affiliates.

Upon entering into the Term Loan Agreement on June 30, 2017, the Company used approximately $312.6 million of the proceeds to purchase approximately $296.2 million aggregate principal amount (the “Repurchased Notes”) of the Company’s previously outstanding 2020 Notes, pay accrued interest of approximately $6.4 million on the Repurchased Notes, premiums to repay the debt early of $4.7 million and expenses incurred of approximately $5.3 million in connection with the Term Loan financing and the tender offer for the 2020 Notes.

On June 30, 2017, the Company also delivered a notice of redemption to the holders of the approximately $503.8 million aggregate principal amount of 2020 Notes which remained outstanding after the purchase of the Repurchased Notes. Pursuant to that notice, the Company redeemed on August 1, 2017, approximately $103.8 million aggregate principal amount of 2020 Notes at a redemption price of 101.313%, plus accrued but unpaid interest. The Company financed the redemption through the remaining net proceeds of the Term Loan financing described above, plus available cash.

At June 30, 2017, the fair value of the Term Loan debt was $400.0 million. At June 30, 2017 and December 31, 2016, the fair value of the Company's 2020 Notes was $510.7 million and $820.0 million, respectively, based on quoted market prices for the instrument. At June 30, 2017 and December 31, 2016, the fair value of the Company's 2021 Notes was $863.0 million and $861.9 million, respectively, based on quoted market prices for the instrument. The fair value of the Term Loan debt, 2020 Notes and 2021 Notes are considered a Level 2 measure according to the fair value hierarchy.

The Company also maintains a $400.0 million revolving credit facility under which as of June 30, 2017 and December 31, 2016, the Company had no outstanding loan balances. At June 30, 2017, approximately $225.3 million was available to borrow and outstanding letters of credit were $125.9 million. At December 31, 2016, $195.2 million was available to borrow and outstanding letters of credit were $132.6 million.

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EARNINGS (LOSS) PER SHARE

6 Months Ended

Jun. 30, 2017

Earnings Per Share [Abstract]

EARNINGS (LOSS) PER SHARE

EARNINGS (LOSS) PER SHARE

The following are computations of basic and diluted earnings (loss) per share (in thousands except for per share amounts):

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2017		2016		2017		2016
Numerator for basic and diluted earnings (loss) per share:
Net income (loss)	$	25,880	$	3,966	$	4,487	$	(16,905	)
Denominator:
Basic shares outstanding	57,190		57,549		57,226		57,599
Dilutive effect of equity-based compensation awards	146		129		123		—
Dilutive shares outstanding	57,336		57,678		57,349		57,599
Basic earnings (loss) per share:	$	0.45	$	0.07	$	0.08	$	(0.29	)
Diluted earnings (loss) per share:	$	0.45	$	0.07	$	0.08	$	(0.29	)

For the three months ended June 30, 2017 and 2016, the dilutive effect of all then outstanding options, restricted stock and performance awards is included in the EPS calculations above except for 142,503 and 348,197, respectively, of outstanding performance stock awards for which the performance criteria were not attained at that time and 14,699 and 9,537, respectively, of restricted stock awards which were antidilutive at that time.

For the six months ended June 30, 2017, the dilutive effect of all then outstanding options, restricted stock and performance awards is included in the EPS calculations above except for 142,503 of outstanding performance stock awards for which the performance criteria were not attained at that time and 21,013 of restricted stock awards which were antidilutive at that time.

As a result of the net loss reported for the six months ended June 30, 2016, all then outstanding stock options, restricted stock awards and performance awards totaling 886,685 were excluded from the calculation of diluted earnings (loss) per share as their inclusion would have an antidilutive effect.

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ACCUMULATED OTHER COMPREHENSIVE LOSS

6 Months Ended

Jun. 30, 2017

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 six months ended June 30, 2017 were as follows (in thousands):    

	Foreign Currency Translation			Unrealized Gains on Available-For-Sale Securities			Unfunded Pension Liability			Total
Balance at January 1, 2017	$	(212,211	)	$	(321	)	$	(1,794	)	$	(214,326	)
Other comprehensive income before reclassifications	20,847			281			—			21,128
Amounts reclassified out of accumulated other comprehensive loss	—			222			—			222
Tax effects				(201		)	—			(201		)
Other comprehensive income	$	20,847		$	302		$	—		$	21,149
Balance at June 30, 2017	$	(191,364	)	$	(19	)	$	(1,794	)	$	(193,177	)

The amounts reclassified out of accumulated other comprehensive loss into the consolidated statements of operations, with presentation location during the three and six months ended June 30, 2017 were as follow (in thousands):

	For the Three Months Ended		For the Six Months Ended
Comprehensive (Loss) Income Components	June 30, 2017		June 30, 2017		Location
Unrealized holding gains on available-for-sale investments	$	76	$	222	Other expense

There were no reclassifications out of accumulated other comprehensive loss into the consolidated statements of operations during the three and six months ended June 30, 2016.

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STOCK-BASED COMPENSATION

6 Months Ended

Jun. 30, 2017

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 six months ended June 30, 2017 was $2.9 million and $5.2 million, respectively. Total stock-based compensation cost charged to selling, general and administrative expenses for the three and six months ended June 30, 2016 was $2.6 million and $4.7 million, respectively. The total income tax benefit recognized in the consolidated statements of operations from stock-based compensation was $0.8 million and $1.5 million for the three and six months ended June 30, 2017, respectively. The total income tax benefit recognized in the consolidated statements of operations from stock-based compensation was $0.8 million and $1.4 million for the three and six months ended June 30, 2016, 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 six months ended June 30, 2017:

Restricted Stock	Number of Shares		Weighted Average Grant-Date Fair Value
Balance at January 1, 2017	510,041		$	52.65
Granted	161,250		$	56.15
Vested	(105,064	)	$	54.17
Forfeited	(34,374	)	$	51.50
Balance at June 30, 2017	531,853		$	53.49

As of June 30, 2017, there was $23.8 million of total unrecognized compensation cost arising from restricted stock awards under the Company's Plans. This cost is expected to be recognized over a weighted average period of 2.6 years. The total fair value of restricted stock vested during the three and six months ended June 30, 2017 was $4.5 million and $6.0 million, respectively. The total fair value of restricted stock vested during the three and six months ended June 30, 2016 was $2.3 million and $6.1 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, Free Cash Flow 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 six months ended June 30, 2017:

Performance Stock	Number of Shares		Weighted Average Grant-Date Fair Value
Balance at January 1, 2017	220,882		$	54.69
Granted	588		$	54.44
Vested	(25,168	)	$	54.84
Forfeited	(16,187	)	$	56.24
Balance at June 30, 2017	180,115		$	54.70

As of June 30, 2017, there was $0.9 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 June 30, 2017. The total fair value of performance awards vested during the six months ended June 30, 2017 was $1.4 million. No performance awards vested during the three months ended June 30, 2016. The total fair value of performance awards vested during the six months ended June 30, 2016 was $0.4 million.

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 six months ended June 30, 2017, the Company repurchased and retired a total of 0.1 million shares and 0.2 million respectively, of the Company's common stock for a total cost of $5.5 million and $12.3 million, respectively. During the three and six months ended June 30, 2016, the Company repurchased and retired a total of 0.1 million shares and 0.2 million shares, respectively, of the Company's common stock for a total cost of $5.1 million and $10.1 million, respectively. Through June 30, 2017, the Company has repurchased and retired a total of 4.1 million shares of the Company's common stock for a total cost of $212.1 million under this program. As of June 30, 2017, an additional $87.9 million remains available for repurchase of shares under the current authorized program.

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COMMITMENTS AND CONTINGENCIES

6 Months Ended

Jun. 30, 2017

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 June 30, 2017 and December 31, 2016, the Company had recorded reserves of $20.8 million and $22.0 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 June 30, 2017 and December 31, 2016, 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 June 30, 2017 and December 31, 2016, the $20.8 million and $22.0 million, respectively, of reserves consisted of (i) $17.7 million and $18.2 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) $3.1 million and $3.8 million, respectively, primarily related to federal, state and provincial enforcement actions, which were included in accrued expenses on the consolidated balance sheets.

As of June 30, 2017, the principal legal and administrative proceedings in which the Company was involved, or which had been terminated during 2017, 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 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 June 30, 2017 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 June 30, 2017, 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 June 30, 2017. From January 1, 2017 to June 30, 2017, 17 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, 33 are now settled, 16 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. The Company 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 Environmental Protection Agency (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 and McKesson which had shipped wastes to those sites. Accordingly, Waste Management or McKesson are paying all costs of defending those subsidiaries in those 17 cases, including legal fees and settlement costs. However, there can be no guarantee that the Company's ultimate liabilities for those sites will not exceed the amount recorded or that indemnities applicable to any of these sites will be available to pay all or a portion of related costs. Except for the indemnification agreements which the Company holds from ChemWaste, 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 June 30, 2017 and December 31, 2016, there were five proceedings for which the Company reasonably believes 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.

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INCOME TAXES

6 Months Ended

Jun. 30, 2017

Income Tax Disclosure [Abstract]

INCOME TAXES

INCOME TAXES

The Company records a tax provision or benefit on an interim basis using an estimated annual effective tax rate. This rate is applied to the current period ordinary income or loss to determine the income tax provision or benefit allocated to the interim period. Losses from jurisdictions for which no benefit can be recognized and the income tax effects of unusual or infrequent items are excluded from the estimated annual effective tax rate and are recognized in the impacted interim period. The estimated annual effective tax rate may be significantly impacted by projected earnings mix by tax jurisdiction. Adjustments to the estimated annual effective income tax rate are recognized in the period when such estimates are revised.

The Company’s effective tax rate for the three and six months ended June 30, 2017 was 47.3% and 85.2% compared to 68.7% and 57.3% for the same periods in 2016. The variations in the effective income tax rates for the three and six months ended June 30, 2017 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 and in the second quarter of 2017 the tax expense associated with the gain on the sale of the Transformer Services business.

As of June 30, 2017 and December 31, 2016, the Company had recorded $1.8 million and $1.7 million, respectively, of liabilities for unrecognized tax benefits and $0.4 million and $0.3 million of interest, respectively.

Due to expiring statute of limitation periods, the Company believes that total unrecognized tax benefits will decrease by $0.4 million within the next 12 months.

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SEGMENT REPORTING

6 Months Ended

Jun. 30, 2017

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 its business, makes operating decisions and assesses performance. The Company's operations are managed in six operating segments: Technical Services, Industrial Services, Field Services, Safety-Kleen, Oil and Gas Field Services and Lodging Services. For purposes of segment disclosure the Industrial Services and Field Services operating segments have been aggregated into a single reportable segment based upon their similar economic and other characteristics, and the Oil and Gas Field Services and Lodging Services operating segments have been combined as they do not meet the quantitative thresholds for separate presentation.

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 operating segments described above are recorded as “Corporate Items.” Corporate Items revenues consist of two different operations for which the revenues are insignificant. Corporate Items cost of revenues represents certain central services that are not allocated to the Company's operating 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 operating segments.  

The following table reconciles third party revenues to direct revenues for the three and six months ended June 30, 2017 and 2016 (in thousands):

	For the Three Months Ended June 30, 2017											For the Three Months Ended June 30, 2016
	Third party revenues		Intersegment revenues, net			Corporate Items, net			Direct revenues			Third party revenues		Intersegment revenues, net			Corporate Items, net			Direct revenues
Technical Services	$	254,487	$	40,001		$	408		$	294,896		$	229,130	$	35,578		$	667		$	265,375
Industrial and Field Services	167,899		(9,067		)	(133		)	158,699			164,641		(7,922		)	(303		)	156,416
Safety-Kleen	302,956		(31,639		)	(2		)	271,315			277,715		(29,092		)	1			248,624
Oil, Gas and Lodging Services	27,245		705			45			27,995			24,860		1,436			79			26,375
Corporate Items	201		—			(318		)	(117		)	1,164		—			(444		)	720
Total	$	752,788	$	—		$	—		$	752,788		$	697,510	$	—		$	—		$	697,510

	For the Six Months Ended June 30, 2017											For the Six Months Ended June 30, 2016
	Third party revenues		Intersegment revenues, net			Corporate Items, net			Direct revenues			Third party revenues		Intersegment revenues, net			Corporate Items, net			Direct revenues
Technical Services	$	484,705	$	80,045		$	1,130		$	565,880		$	448,235	$	70,422		$	1,055		$	519,712
Industrial and Field Services	301,456		(17,426		)	(29		)	284,001			294,828		(14,597		)	(316		)	279,915
Safety-Kleen	595,857		(63,708		)	1			532,150			524,676		(57,613		)	367			467,430
Oil, Gas and Lodging Services	59,377		1,089			139			60,605			63,911		1,788			183			65,882
Corporate Items	334		—			(1,241		)	(907		)	1,943		—			(1,289		)	654
Total	$	1,441,729	$	—		$	—		$	1,441,729		$	1,333,593	$	—		$	—		$	1,333,593

The primary financial measure by which the Company evaluates the performance of its segments is "Adjusted EBITDA" which consists of net income (loss) plus accretion of environmental liabilities, depreciation and amortization, other expense, interest expense, net, loss on early extinguishment of debt, provision for income taxes and excludes gain on sale of business. Transactions between the segments are accounted for at the Company’s best estimate based on similar transactions with outside customers.

The following table presents Adjusted EBITDA information used by management by reported segment (in thousands):

	For the Three Months Ended						For the Six Months Ended
	June 30,						June 30,
	2017			2016			2017			2016
Adjusted EBITDA:
Technical Services	$	73,080		$	68,891		$	131,567		$	129,289
Industrial and Field Services	21,484			19,960			23,397			20,393
Safety-Kleen	60,281			55,234			112,649			95,289
Oil, Gas and Lodging Services	268			(1,199		)	58			111
Corporate Items	(34,422		)	(32,441		)	(66,845		)	(67,317		)
Total	$	120,691		$	110,445		$	200,826		$	177,765
Reconciliation to Consolidated Statements of Operations:
Accretion of environmental liabilities	2,416			2,548			4,706			5,053
Depreciation and amortization	71,531			73,393			143,943			142,295
Income from operations	46,744			34,504			52,177			30,417
Other expense	833			189			2,382			539
Loss on early extinguishment of debt	6,045			—			6,045			—
Gain on sale of business	(31,722		)	—			(31,722		)	—
Interest expense, net of interest income	22,492			21,647			45,068			40,627
Income (loss) before provision for income taxes	$	49,096		$	12,668		$	30,404		$	(10,749	)

The following table presents certain assets by reportable segment and in the aggregate (in thousands):

	June 30, 2017
	Technical Services		Industrial and Field Services		Safety-Kleen		Oil, Gas and Lodging Services		Corporate Items		Totals
Property, plant and equipment, net	$	512,058	$	243,195	$	590,282	$	181,001	$	75,917	$	1,602,453
Goodwill	59,973		108,583		304,263		—		—		472,819
Permits and other intangibles, net	76,022		17,135		381,020		8,651		—		482,828
Total assets	$	851,852	$	457,253	$	1,477,660	$	246,195	$	773,322	$	3,806,282

	December 31, 2016
	Technical Services		Industrial and Field Services		Safety-Kleen		Oil, Gas and Lodging Services		Corporate Items		Totals
Property, plant and equipment, net	$	521,134	$	245,143	$	584,647	$	182,038	$	78,865	$	1,611,827
Goodwill	61,116		107,968		296,070		—		—		465,154
Permits and other intangibles, net	78,625		17,817		391,390		10,889		—		498,721
Total assets	$	862,957	$	446,826	$	1,474,755	$	253,242	$	644,140	$	3,681,920

The following table presents total assets by geographical area (in thousands):

	June 30, 2017		December 31, 2016
United States	$	3,088,199	$	2,960,337
Canada	718,083		721,583
Total	$	3,806,282	$	3,681,920

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GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION

6 Months Ended

Jun. 30, 2017

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 (collectively, the "Notes") are guaranteed by substantially all of the Company’s subsidiaries organized in the United States. Each guarantor for the Notes is a 100% owned subsidiary of Clean Harbors, Inc. and its guarantee is both full and unconditional and joint and several. The guarantees are, however, subject to customary release provisions under which, in particular, the guarantee of any domestic restricted subsidiary will be released if the Company sells such subsidiary to an unrelated third party in accordance with the terms of the indentures which govern the Notes. The Notes are not guaranteed by the Company’s subsidiaries organized outside the United States. The following supplemental condensed consolidating financial information for the parent company, the guarantor subsidiaries and the non-guarantor subsidiaries, respectively, is presented in conformity with the requirements of Rule 3-10 of SEC Regulation S-X (“Rule 3-10”).

Following is the condensed consolidating balance sheet at June 30, 2017 (in thousands):

	Clean Harbors, Inc.		Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Consolidating Adjustments			Total
Assets:
Cash and cash equivalents	$	51,391	$	303,996	$	90,979	$	—		$	446,366
Intercompany receivables	220,885		314,705		38,312		(573,902		)	—
Accounts receivables, net	—		419,338		93,037		—			512,375
Other current assets	897		222,283		59,658		(6,845		)	275,993
Property, plant and equipment, net	—		1,198,630		403,823		—			1,602,453
Investments in subsidiaries	2,893,232		570,837		—		(3,464,069		)	—
Intercompany debt receivable	—		89,441		24,701		(114,142		)	—
Goodwill	—		416,775		56,044		—			472,819
Permits and other intangibles, net	—		421,793		61,035		—			482,828
Other long-term assets	2,363		7,555		4,598		(1,068		)	13,448
Total assets	$	3,168,768	$	3,965,353	$	832,187	$	(4,160,026	)	$	3,806,282
Liabilities and Stockholders’ Equity:
Current liabilities	$	123,095	$	375,919	$	127,131	$	(6,845	)	$	619,300
Intercompany payables	314,530		257,453		1,919		(573,902		)	—
Closure, post-closure and remedial liabilities, net	—		145,777		16,475		—			162,252
Long-term obligations	1,626,505		—		—		—			1,626,505
Intercompany debt payable	3,701		21,000		89,441		(114,142		)	—
Other long-term liabilities	—		278,833		19,523		(1,068		)	297,288
Total liabilities	2,067,831		1,078,982		254,489		(695,957		)	2,705,345
Stockholders’ equity	1,100,937		2,886,371		577,698		(3,464,069		)	1,100,937
Total liabilities and stockholders’ equity	$	3,168,768	$	3,965,353	$	832,187	$	(4,160,026	)	$	3,806,282

Following is the condensed consolidating balance sheet at December 31, 2016 (in thousands):

	Clean Harbors, Inc.		Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Consolidating Adjustments			Total
Assets:
Cash and cash equivalents	$	51,417	$	155,943	$	99,637	$	—		$	306,997
Intercompany receivables	200,337		354,836		49,055		(604,228		)	—
Accounts receivables, net	—		417,029		79,197		—			496,226
Other current assets	3,096		234,408		69,257		(17,113		)	289,648
Property, plant and equipment, net	—		1,211,210		400,617		—			1,611,827
Investments in subsidiaries	2,851,571		580,124		—		(3,431,695		)	—
Intercompany debt receivable	—		86,409		24,701		(111,110		)	—
Goodwill	—		412,638		52,516		—			465,154
Permits and other intangibles, net	—		435,594		63,127		—			498,721
Other long-term assets	2,446		7,582		4,387		(1,068		)	13,347
Total assets	$	3,108,867	$	3,895,773	$	842,494	$	(4,165,214	)	$	3,681,920
Liabilities and Stockholders’ Equity:
Current liabilities	$	21,805	$	366,831	$	133,145	$	(17,113	)	$	504,668
Intercompany payables	365,848		237,058		1,322		(604,228		)	—
Closure, post-closure and remedial liabilities, net	—		150,682		15,640		—			166,322
Long-term obligations	1,633,272		—		—		—			1,633,272
Intercompany debt payable	3,701		21,000		86,409		(111,110		)	—
Other long-term liabilities	—		275,649		18,836		(1,068		)	293,417
Total liabilities	2,024,626		1,051,220		255,352		(733,519		)	2,597,679
Stockholders’ equity	1,084,241		2,844,553		587,142		(3,431,695		)	1,084,241
Total liabilities and stockholders’ equity	$	3,108,867	$	3,895,773	$	842,494	$	(4,165,214	)	$	3,681,920

Following is the consolidating statement of operations for the three months ended June 30, 2017 (in thousands):

	Clean Harbors, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues
Service revenues	$	—		$	474,801		$	147,924		$	(11,785	)	$	610,940
Product revenues	—			125,859			18,730			(2,741		)	141,848
Total revenues	—			600,660			166,654			(14,526		)	752,788
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	—			306,960			117,181			(11,785		)	412,356
Product cost of revenues	—			98,645			11,543			(2,741		)	107,447
Total cost of revenues	—			405,605			128,724			(14,526		)	519,803
Selling, general and administrative expenses	27			92,504			19,763			—			112,294
Accretion of environmental liabilities	—			2,181			235			—			2,416
Depreciation and amortization	—			51,937			19,594			—			71,531
(Loss) income from operations	(27		)	48,433			(1,662		)	—			46,744
Other expense	(76		)	(406		)	(351		)	—			(833		)
Loss on early extinguishment of debt	(6,045		)	—			—			—			(6,045		)
Gain on sale of business	—			31,722			—			—			31,722
Interest (expense) income	(22,614		)	240			(118		)	—			(22,492		)
Equity in earnings of subsidiaries, net of taxes	43,167			(5,332		)	—			(37,835		)	—
Intercompany interest income (expense)	—			1,268			(1,268		)	—			—
Income (loss) before (benefit) provision for income taxes	14,405			75,925			(3,399		)	(37,835		)	49,096
(Benefit) provision for income taxes	(11,475		)	31,981			2,710			—			23,216
Net income (loss)	25,880			43,944			(6,109		)	(37,835		)	25,880
Other comprehensive income	15,098			15,098			12,837			(27,935		)	15,098
Comprehensive income	$	40,978		$	59,042		$	6,728		$	(65,770	)	$	40,978

Following is the consolidating statement of operations for the three months ended June 30, 2016 (in thousands):

	Clean Harbors, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues
Service revenues	$	—		$	456,013		$	139,413		$	(10,864	)	$	584,562
Product revenues	—			95,648			19,391			(2,091		)	112,948
Total revenues	—			551,661			158,804			(12,955		)	697,510
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	(587		)	292,343			107,792			(10,864		)	388,684
Product cost of revenues	—			79,108			14,301			(2,091		)	91,318
Total cost of revenues	(587		)	371,451			122,093			(12,955		)	480,002
Selling, general and administrative expenses	37			83,882			23,144			—			107,063
Accretion of environmental liabilities	—			2,313			235			—			2,548
Depreciation and amortization	—			50,696			22,697			—			73,393
Income (loss) from operations	550			43,319			(9,365		)	—			34,504
Other income (expense)	—			400			(589		)	—			(189		)
Interest (expense) income	(22,962		)	1,284			31			—			(21,647		)
Equity in earnings of subsidiaries, net of taxes	17,413			(9,195		)	—			(8,218		)	—
Intercompany interest income (expense)	—			5,497			(5,497		)	—			—
(Loss) income before (benefit) provision for income taxes	(4,999		)	41,305			(15,420		)	(8,218		)	12,668
(Benefit) provision for income taxes	(8,965		)	23,892			(6,225		)	—			8,702
Net income (loss)	3,966			17,413			(9,195		)	(8,218		)	3,966
Other comprehensive loss	(1,178		)	(1,178		)	(597		)	1,775			(1,178		)
Comprehensive income (loss)	$	2,788		$	16,235		$	(9,792	)	$	(6,443	)	$	2,788

Following is the consolidating statement of operations for the six months ended June 30, 2017 (in thousands):

	Clean Harbors, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues
Service revenues	$	—		$	918,106		$	278,995		$	(25,947	)	$	1,171,154
Product revenues	—			242,509			34,061			(5,995		)	270,575
Total revenues	—			1,160,615			313,056			(31,942		)	1,441,729
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	—			601,105			228,285			(25,947		)	803,443
Product cost of revenues	—			195,150			23,790			(5,995		)	212,945
Total cost of revenues	—			796,255			252,075			(31,942		)	1,016,388
Selling, general and administrative expenses	51			184,675			39,789			—			224,515
Accretion of environmental liabilities	—			4,236			470			—			4,706
Depreciation and amortization	—			103,837			40,106			—			143,943
(Loss) income from operations	(51		)	71,612			(19,384		)	—			52,177
Other expense	(222		)	(1,795		)	(365		)	—			(2,382		)
Loss on early extinguishment of debt	(6,045		)	—			—			—			(6,045		)
Gain on sale of business	—			31,722			—			—			31,722
Interest (expense) income	(45,273		)	359			(154		)	—			(45,068		)
Equity in earnings of subsidiaries, net of taxes	35,530			(27,156		)	—			(8,374		)	—
Intercompany interest income (expense)	—			2,565			(2,565		)	—			—
(Loss) income before (benefit) provision for income taxes	(16,061		)	77,307			(22,468		)	(8,374		)	30,404
(Benefit) provision for income taxes	(20,548		)	41,618			4,847			—			25,917
Net income (loss)	4,487			35,689			(27,315		)	(8,374		)	4,487
Other comprehensive income	21,149			21,149			17,869			(39,018		)	21,149
Comprehensive income (loss)	$	25,636		$	56,838		$	(9,446	)	$	(47,392	)	$	25,636

Following is the consolidating statement of operations for the six months ended June 30, 2016 (in thousands):

	Clean Harbors, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues
Service revenues	$	—		$	884,490		$	253,436		$	(23,133	)	$	1,114,793
Product revenues	—			185,236			38,104			(4,540		)	218,800
Total revenues	—			1,069,726			291,540			(27,673		)	1,333,593
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	(587		)	575,307			211,083			(23,133		)	762,670
Product cost of revenues	—			158,462			27,689			(4,540		)	181,611
Total cost of revenues	(587		)	733,769			238,772			(27,673		)	944,281
Selling, general and administrative expenses	61			164,537			46,949			—			211,547
Accretion of environmental liabilities	—			4,603			450			—			5,053
Depreciation and amortization	—			99,391			42,904			—			142,295
Income (loss) from operations	526			67,426			(37,535		)	—			30,417
Other income (expense)	—			312			(851		)	—			(539		)
Interest (expense) income	(43,105		)	2,395			83			—			(40,627		)
Equity in earnings of subsidiaries, net of taxes	8,642			(35,690		)	—			27,048			—
Intercompany interest income (expense)	—			10,656			(10,656		)	—			—
(Loss) income before (benefit) provision for income taxes	(33,937		)	45,099			(48,959		)	27,048			(10,749		)
(Benefit) provision for income taxes	(17,032		)	36,457			(13,269		)	—			6,156
Net (loss) income	(16,905		)	8,642			(35,690		)	27,048			(16,905		)
Other comprehensive income	44,659			44,659			28,330			(72,989		)	44,659
Comprehensive income (loss)	$	27,754		$	53,301		$	(7,360	)	$	(45,941	)	$	27,754

Following is the condensed consolidating statement of cash flows for the six months ended June 30, 2017 (in thousands):

	Clean Harbors, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Net cash (used in) from operating activities	$	(93,808	)	$	206,496		$	4,243		$	—		$	116,931
Cash flows from (used in) investing activities:
Additions to property, plant and equipment	—			(75,152		)	(13,590		)	—			(88,742		)
Proceeds from sales of fixed assets	—			984			1,137			—			2,121
Acquisitions, net of cash acquired	—			(9,277		)	—			—			(9,277		)
Proceeds on sale of businesses, net of transactional costs	—			46,210			181			—			46,391
Additions to intangible assets, including costs to obtain or renew permits	—			(888		)	(351		)	—			(1,239		)
Proceeds from sale of investments	376			—			—			—			376
Intercompany	—			(14,343		)	—			14,343			—
Net cash from (used in) investing activities	376			(52,466		)	(12,623		)	14,343			(50,370		)
Cash flows from (used in) financing activities:
Change in uncashed checks	—			(5,977		)	(2,384		)	—			(8,361		)
Proceeds from exercise of stock options	46			—			—			—			46
Issuance of restricted shares, net of shares remitted	(2,132		)	—			—			—			(2,132		)
Repurchases of common stock	(12,257		)	—			—			—			(12,257		)
Deferred financing costs paid	(4,727		)	—			—			—			(4,727		)
Premiums paid on early extinguishment of debt	(4,665		)	—			—			—			(4,665		)
Principal payment on debt	(296,202		)	—			—			—			(296,202		)
Issuance of senior secured notes, net of discount	399,000			—			—			—			399,000
Intercompany	14,343			—			—			(14,343		)	—
Net cash from (used in) financing activities	93,406			(5,977		)	(2,384		)	(14,343		)	70,702
Effect of exchange rate change on cash	—			—			2,106			—			2,106
(Decrease) increase in cash and cash equivalents	(26		)	148,053			(8,658		)	—			139,369
Cash and cash equivalents, beginning of period	51,417			155,943			99,637			—			306,997
Cash and cash equivalents, end of period	$	51,391		$	303,996		$	90,979		$	—		$	446,366

Following is the condensed consolidating statement of cash flows for the six months ended June 30, 2016 (in thousands):

	Clean Harbors, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Net cash from operating activities	$	42,990		$	65,860		$	11,201		$	—		$	120,051
Cash flows used in investing activities:
Additions to property, plant and equipment	—			(105,175		)	(18,354		)	—			(123,529		)
Proceeds from sales of fixed assets	—			694			1,974			—			2,668
Acquisitions, net of cash acquired	—			(48,989		)	(10,000		)	—			(58,989		)
Additions to intangible assets, including costs to obtain or renew permits	—			(908		)	(65		)	—			(973		)
Purchases of available-for-sale securities	(102		)	—			(496		)	—			(598		)
Intercompany	—			(11,827		)	—			11,827			—
Investment in subsidiaries	(250,625		)	—			—			250,625			—
Net cash used in investing activities	(250,727		)	(166,205		)	(26,941		)	262,452			(181,421		)
Cash flows from (used in) financing activities:
Change in uncashed checks	—			(9,266		)	(1,756		)	—			(11,022		)
Proceeds from exercise of stock options	184			—			—			—			184
Issuance of restricted shares, net of shares remitted	(1,879		)	—			—			—			(1,879		)
Repurchases of common stock	(10,134		)	—			—			—			(10,134		)
Excess tax benefit of stock-based compensation	2			—			—			—			2
Deferred financing costs paid	(2,614		)	—			—			—			(2,614		)
Issuance of senior unsecured notes, including premium	250,625			250,625			—			(250,625		)	250,625
Intercompany	11,827			—			—			(11,827		)	—
Net cash from (used in) financing activities	248,011			241,359			(1,756		)	(262,452		)	225,162
Effect of exchange rate change on cash	—			—			4,423			—			4,423
Increase (decrease) in cash and cash equivalents	40,274			141,014			(13,073		)	—			168,215
Cash and cash equivalents, beginning of period	11,017			83,479			90,212			—			184,708
Cash and cash equivalents, end of period	$	51,291		$	224,493		$	77,139		$	—		$	352,923

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SUBSEQUENT EVENTS

6 Months Ended

Jun. 30, 2017

Subsequent Events [Abstract]

SUBSEQUENT EVENTS

SUBSEQUENT EVENTS

On July 14, 2017, the Company acquired Lonestar West Inc. ("Lonestar"), a public company headquartered in Alberta, Canada, for approximately CAD $43.0 million ($34.0 million USD) in cash which includes an equity payout of CAD $0.72 per share to Lonestar shareholders and the assumption of approximately CAD $22.0 million ($17.4 million USD) in outstanding debt, which Clean Harbors subsequently repaid. Due to the timing of the acquisition of Lonestar, preliminary opening balance sheet amounts and purchase accounting adjustments are still being prepared and the purchase price is subject to customary post-closing adjustments. The acquisition will accelerate the Company's growth in the daylighting and hydro excavation services markets. In addition to increasing the size of the Company's hydro vac fleet, Lonestar’s network of locations will provide the Company with direct access to key geographic markets in both the United States and Canada. The acquired company will be included in the Industrial and Field Services segment.

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SIGNIFICANT ACCOUNTING POLICIES (Policies)

6 Months Ended

Jun. 30, 2017

Accounting Policies [Abstract]

Reclassifications

As disclosed in the Company's Annual Report on Form 10-K for the year ended December 31, 2016, in the fourth quarter of 2016 the Company changed the manner in which it manages its business, makes operating decisions and assesses the Company's performance. The Company's operations are now managed in six operating segments: Technical Services, Industrial Services, Field Services, Safety-Kleen, Oil and Gas Field Services and Lodging Services. For purposes of segment disclosure the Industrial Services and Field Services operating segments have been aggregated into a single reportable segment based upon their similar economic and other characteristics, and the Oil and Gas Field Services and Lodging Services operating segments have been combined as they do not meet the quantitative thresholds for separate presentation. The amounts presented for the three and six months ended June 30, 2016 have been recast to reflect the impact of such changes. These reclassifications and adjustments had no effect on consolidated statements of operations, consolidated statements of comprehensive income, consolidated statements of cash flows or consolidated statements of stockholders' equity for any of the periods presented.

Recent Accounting Pronouncements

In July 2015, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2015-11, Inventory (Topic 330). The amendment provides guidance regarding the measurement of inventory. Entities should measure inventory within the scope of this update at the lower of cost and net realizable value. The adoption of ASU 2015-11 was applied prospectively and as of January 1, 2017 did not have an impact on the Company's consolidated financial statements.

In March 2016, the FASB issued ASU 2016-09, Compensation-Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting. 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. Stock-based compensation excess tax benefits or deficiencies are now reflected in the Consolidated Statements of Operations as a component of the provision for income taxes, whereas they previously were recognized in equity. Additionally, the Consolidated Statements of Cash Flows now include excess tax benefits as an operating activity. Previously, income tax benefits at settlement of an award were reported as a reduction to operating cash flows and an increase to financing cash flows to the extent that those benefits exceeded the income tax benefits reported in earnings during the award's vesting period. The Company has elected to apply that change in cash flow classification on a prospective basis, leaving previously reported net cash from operating activities and net cash from financing activities in the accompanying consolidated statement of cash flows for the period ended June 30, 2016 unchanged. Finally, the Company has elected to account for forfeitures as they occur, rather than estimate expected forfeitures. As a result of the adoption of this update, the Company recorded a cumulative-effect adjustment that reduced beginning retained earnings by $0.5 million, net of tax.

In August 2016, the 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. The Company early adopted the amendments in the Update on a retrospective basis in the second quarter of fiscal year 2017. As a result of adoption, the Company recorded cash paid in the second quarter for debt prepayment and extinguishment costs as financing activities in the accompanying consolidated statements of cash flows.

Standard to be implemented

In May 2014, FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606). ASU 2014-09 outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry-specific guidance. In August 2015, FASB issued ASU 2015-14 which deferred the effective date of ASU 2014-09 for all entities by one year. In March 2016, FASB issued ASU 2016-08, which 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. In April 2016, FASB issued ASU 2016-10, which 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. In May 2016, FASB issued ASU 2016-12, which provided narrow scope improvements and practical expedients on assessing collectability, presentation of sales taxes, noncash consideration, and completed contracts and contract modifications at transition. ASU 2014-09 is currently effective for annual reporting periods (including interim reporting periods within those periods) beginning after December 15, 2017. The guidance permits two methods of adoption: retrospectively to each prior reporting period presented (full retrospective method), or retrospectively with the cumulative effect of initially applying the guidance recognized at the date of initial application (the cumulative catch-up transition method). The Company expects that it will adopt ASU 2014‑09 beginning in the first quarter of 2018 and continues its evaluation of the impact of the new standard on its accounting policies, disclosures, processes, and system requirements. The Company has assigned internal resources to assist in this implementation project and believes that the project is progressing timely. The Company currently anticipates adopting this ASU using the modified retrospective method. As the Company completes its evaluation of this new standard, the Company's preliminary assessments could change.

In February 2017, the FASB issued ASU 2017-05, Other Income-Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20): Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets. The amendments in this Update are meant to clarify the scope of ASC Subtopic 610-20, Other Income-Gains and Losses from the Derecognition of Nonfinancial Assets and to add guidance for partial sales of nonfinancial assets. The amendments in this Update should be applied using a full retrospective method or a modified retrospective method and are effective at the same time as ASU 2014-09. Further, the Company is required to adopt ASU 2017-05 at the same time that it adopts the guidance in ASU 2014-09. Adoption is not expected to have a material impact on the Company's consolidated financial statements.

In May 2017, the FASB issued ASU 2017-09, Compensation-Stock Compensation (Topic 718): Scope of Modification Accounting. The amendments in this Update are meant to provide guidance about which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting in Topic 718. The amendments in this Update should be applied prospectively to an award modified on or after the adoption date and are effective for annual reporting periods (including interim reporting periods within those periods) beginning after December 15, 2017. Adoption is not expected to have a material impact on the Company's consolidated financial statements.

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BUSINESS COMBINATIONS (Tables)

6 Months Ended

Jun. 30, 2017

Business Combinations [Abstract]

Schedule of Business Acquisitions, by Acquisition

The components and allocation of the purchase price consist of the following amounts (in thousands):

	At Acquisition Dates As Reported December 31, 2016			Measurement Period Adjustments			Final Allocations
Accounts receivable	$	15,767		$	475		$	16,242
Inventories and supplies	12,515			173			12,688
Prepaid expenses and other current assets	777			(25		)	752
Property, plant and equipment	143,025			891			143,916
Permits and other intangibles	28,856			—			28,856
Current liabilities	(20,258		)	353			(19,905		)
Closure and post-closure liabilities	(2,408		)	(596		)	(3,004		)
Remedial liabilities, less current portion	(2,041		)	(504		)	(2,545		)
Deferred taxes, unrecognized tax benefits and other long-term liabilities	(17,019		)	(3,200		)	(20,219		)
Total identifiable net assets	159,214			(2,433		)	156,781
Goodwill	45,791			2,186			47,977
Total purchase price, net of cash acquired	$	205,005		$	(247	)	$	204,758

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DISPOSITION OF BUSINESS (Tables)

6 Months Ended

Jun. 30, 2017

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Disposition of Business

The following table presents the carrying amounts of the Company's Transformer Services business that was disposed of on June 30, 2017 (in thousands):

	June 30, 2017
Total current assets	$	7,216
Property, plant and equipment, net	8,773
Total other assets	1,681
Total assets divested	$	17,670
Total current liabilities	3,849
Total other liabilities	1,170
Total liabilities divested	$	5,019
Net carrying value divested	$	12,651

Transformer Services

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Disposition of Business

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2017		2016		2017		2016
Income before provision for income taxes	$	1,873	$	986	$	2,771	$	1,793

Catalyst Services

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Disposition of Business

The following table presents the income before provision for income taxes attributable to the Catalyst Services business included in the Company's consolidated results of operations for three and six months ended June 30, 2016 (in thousands):

	Three Months Ended		Six Months Ended
	June 30, 2016		June 30, 2016
Income before provision for income taxes	$	2,607	$	1,508

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INVENTORIES AND SUPPLIES (Tables)

6 Months Ended

Jun. 30, 2017

Inventory Disclosure [Abstract]

Schedule of Inventory

Inventories and supplies consisted of the following (in thousands):

	June 30, 2017		December 31, 2016
Oil and oil products	$	57,554	$	52,158
Supplies and drums	92,995		90,610
Solvent and solutions	8,575		8,566
Modular camp accommodations	2,699		15,255
Other	10,717		11,839
Total inventories and supplies	$	172,540	$	178,428

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PROPERTY, PLANT AND EQUIPMENT (Tables)

6 Months Ended

Jun. 30, 2017

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

Property, plant and equipment consisted of the following (in thousands):

	June 30, 2017		December 31, 2016
Land	$	121,114	$	120,575
Asset retirement costs (non-landfill)	14,861		14,567
Landfill assets	141,878		139,708
Buildings and improvements	406,030		373,160
Camp equipment	168,524		152,740
Vehicles	564,723		541,022
Equipment	1,605,581		1,483,736
Furniture and fixtures	5,524		5,492
Construction in progress	54,934		146,904
	3,083,169		2,977,904
Less - accumulated depreciation and amortization	1,480,716		1,366,077
Total property, plant and equipment, net	$	1,602,453	$	1,611,827

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GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)

6 Months Ended

Jun. 30, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of changes to goodwill

The changes in goodwill by segment for the six months ended June 30, 2017 were as follows (in thousands):

	Technical Services			Industrial & Field Services		Safety-Kleen		Oil, Gas and Lodging Services		Totals
Balance at January 1, 2017	$	61,116		$	107,968	$	296,070	$	—	$	465,154
Increase from current period acquisitions	—			—		4,916		—		4,916
Measurement period adjustments from prior period acquisitions	—			—		2,186		—		2,186
Decrease from disposition of business	(1,300		)	—		—				(1,300		)
Foreign currency translation and other	157			615		1,091		—		1,863
Balance at June 30, 2017	$	59,973		$	108,583	$	304,263	$	—	$	472,819

Summary of indefinite-lived intangible assets

As of June 30, 2017 and December 31, 2016, the Company's total finite-lived and indefinite-lived intangible assets consisted of the following (in thousands):

	June 30, 2017							December 31, 2016
	Cost		Accumulated Amortization		Net		Weighted Average Remaining Amortization Period (in years)	Cost		Accumulated Amortization		Net		Weighted Average Remaining Amortization Period (in years)
Permits	$	173,174	$	70,698	$	102,476	21.4	$	171,637	$	67,301	$	104,336	18.9
Customer and supplier relationships	395,911		143,038		252,873		11.9	393,426		127,462		265,964		12.2
Other intangible assets	34,673		30,166		4,507		7.5	34,254		28,456		5,798		7.1
Total amortizable permits and other intangible assets	603,758		243,902		359,856		14.5	599,317		223,219		376,098		13.9
Trademarks and trade names	122,972		—		122,972		Indefinite	122,623		—		122,623		Indefinite
Total permits and other intangible assets	$	726,730	$	243,902	$	482,828		$	721,940	$	223,219	$	498,721

Schedule of finite-lived intangible assets

As of June 30, 2017 and December 31, 2016, the Company's total finite-lived and indefinite-lived intangible assets consisted of the following (in thousands):

	June 30, 2017							December 31, 2016
	Cost		Accumulated Amortization		Net		Weighted Average Remaining Amortization Period (in years)	Cost		Accumulated Amortization		Net		Weighted Average Remaining Amortization Period (in years)
Permits	$	173,174	$	70,698	$	102,476	21.4	$	171,637	$	67,301	$	104,336	18.9
Customer and supplier relationships	395,911		143,038		252,873		11.9	393,426		127,462		265,964		12.2
Other intangible assets	34,673		30,166		4,507		7.5	34,254		28,456		5,798		7.1
Total amortizable permits and other intangible assets	603,758		243,902		359,856		14.5	599,317		223,219		376,098		13.9
Trademarks and trade names	122,972		—		122,972		Indefinite	122,623		—		122,623		Indefinite
Total permits and other intangible assets	$	726,730	$	243,902	$	482,828		$	721,940	$	223,219	$	498,721

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 June 30, 2017 was as follows (in thousands):

Years Ending December 31,	Expected Amortization
2017 (six months)	$	18,078
2018	34,091
2019	31,238
2020	28,756
2021	26,557
Thereafter	221,136
	$	359,856

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ACCRUED EXPENSES (Tables)

6 Months Ended

Jun. 30, 2017

Payables and Accruals [Abstract]

Accrued expenses

Accrued expenses consisted of the following at June 30, 2017 and December 31, 2016 (in thousands):

	June 30, 2017		December 31, 2016
Insurance	$	58,816	$	63,061
Interest	15,006		21,536
Accrued compensation and benefits	45,159		34,641
Income, real estate, sales and other taxes	37,474		35,083
Other	35,040		36,400
	$	191,495	$	190,721

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CLOSURE AND POST-CLOSURE LIABILITIES (Tables)

6 Months Ended

Jun. 30, 2017

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, 2017 through June 30, 2017 were as follows (in thousands):

	Landfill Retirement Liability			Non-Landfill Retirement Liability			Total
Balance at January 1, 2017	$	30,630		$	27,701		$	58,331
Measurement period adjustments from prior period acquisitions	—			596			596
New asset retirement obligations	894			—			894
Adjustment related to disposition of business	—			(1,170		)	(1,170		)
Accretion	1,094			1,270			2,364
Changes in estimates recorded to statement of operations	—			(262		)	(262		)
Changes in estimates recorded to balance sheet	—			(287		)	(287		)
Expenditures	(556		)	(254		)	(810		)
Currency translation and other	82			55			137
Balance at June 30, 2017	$	32,144		$	27,649		$	59,793

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REMEDIAL LIABILITIES (Tables)

6 Months Ended

Jun. 30, 2017

Environmental Remediation Obligations [Abstract]

Changes to remedial liabilities

The changes to remedial liabilities for the six months ended June 30, 2017 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, 2017	$	1,777		$	64,151		$	62,079		$	128,007
Measurement period adjustments from prior period acquisitions	—			—			504			504
Accretion	43			1,332			967			2,342
Changes in estimates recorded to statement of operations	(36		)	(120		)	289			133
Expenditures	(19		)	(2,068		)	(3,205		)	(5,292		)
Currency translation and other	(1		)	2,712			(2,246		)	465
Balance at June 30, 2017	$	1,764		$	66,007		$	58,388		$	126,159

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FINANCING ARRANGEMENTS (Tables)

6 Months Ended

Jun. 30, 2017

Debt Disclosure [Abstract]

Summary of the entity's financial arrangements

The following table is a summary of the Company’s financing arrangements (in thousands):

	June 30, 2017			December 31, 2016
Senior secured notes due June 30, 2024 ("Term Loan"), current	$	4,000		$	—
Senior unsecured notes, at 5.25%, due August 1, 2020 ("2020 Notes"), current	103,798			—
Current portion of long-term obligations, at carrying value	$	107,798		$	—
Senior secured notes due June 30, 2024	$	396,000		$	—
Senior unsecured notes, at 5.25%, due August 1, 2020	400,000			800,000
Senior unsecured notes, at 5.125%, due June 1, 2021 ("2021 Notes")	845,000			845,000
Long-term obligations	$	1,641,000		$	1,645,000
Unamortized debt issuance costs and debt discount/premium, net	(14,495		)	(11,728		)
Long-term obligations, at carrying value	$	1,626,505		$	1,633,272
Total current and long-term obligations, at carrying value	$	1,734,303		$	1,633,272

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EARNINGS (LOSS) PER SHARE (Tables)

6 Months Ended

Jun. 30, 2017

Earnings Per Share [Abstract]

Reconciliation of basic and diluted earnings per share computations

The following are computations of basic and diluted earnings (loss) per share (in thousands except for per share amounts):

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2017		2016		2017		2016
Numerator for basic and diluted earnings (loss) per share:
Net income (loss)	$	25,880	$	3,966	$	4,487	$	(16,905	)
Denominator:
Basic shares outstanding	57,190		57,549		57,226		57,599
Dilutive effect of equity-based compensation awards	146		129		123		—
Dilutive shares outstanding	57,336		57,678		57,349		57,599
Basic earnings (loss) per share:	$	0.45	$	0.07	$	0.08	$	(0.29	)
Diluted earnings (loss) per share:	$	0.45	$	0.07	$	0.08	$	(0.29	)

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ACCUMULATED OTHER COMPREHENSIVE LOSS (Tables)

6 Months Ended

Jun. 30, 2017

Equity [Abstract]

Schedule of accumulated other comprehensive loss

The changes in accumulated other comprehensive loss by component and related tax effects for the six months ended June 30, 2017 were as follows (in thousands):    

	Foreign Currency Translation			Unrealized Gains on Available-For-Sale Securities			Unfunded Pension Liability			Total
Balance at January 1, 2017	$	(212,211	)	$	(321	)	$	(1,794	)	$	(214,326	)
Other comprehensive income before reclassifications	20,847			281			—			21,128
Amounts reclassified out of accumulated other comprehensive loss	—			222			—			222
Tax effects				(201		)	—			(201		)
Other comprehensive income	$	20,847		$	302		$	—		$	21,149
Balance at June 30, 2017	$	(191,364	)	$	(19	)	$	(1,794	)	$	(193,177	)

Reclassification out of accumulated other comprehensive loss

The amounts reclassified out of accumulated other comprehensive loss into the consolidated statements of operations, with presentation location during the three and six months ended June 30, 2017 were as follow (in thousands):

	For the Three Months Ended		For the Six Months Ended
Comprehensive (Loss) Income Components	June 30, 2017		June 30, 2017		Location
Unrealized holding gains on available-for-sale investments	$	76	$	222	Other expense

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STOCK-BASED COMPENSATION (Tables)

6 Months Ended

Jun. 30, 2017

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 six months ended June 30, 2017:

Restricted Stock	Number of Shares		Weighted Average Grant-Date Fair Value
Balance at January 1, 2017	510,041		$	52.65
Granted	161,250		$	56.15
Vested	(105,064	)	$	54.17
Forfeited	(34,374	)	$	51.50
Balance at June 30, 2017	531,853		$	53.49

Summary of performance stock awards

The following table summarizes information about performance stock awards for the six months ended June 30, 2017:

Performance Stock	Number of Shares		Weighted Average Grant-Date Fair Value
Balance at January 1, 2017	220,882		$	54.69
Granted	588		$	54.44
Vested	(25,168	)	$	54.84
Forfeited	(16,187	)	$	56.24
Balance at June 30, 2017	180,115		$	54.70

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SEGMENT REPORTING (Tables)

6 Months Ended

Jun. 30, 2017

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 six months ended June 30, 2017 and 2016 (in thousands):

	For the Three Months Ended June 30, 2017											For the Three Months Ended June 30, 2016
	Third party revenues		Intersegment revenues, net			Corporate Items, net			Direct revenues			Third party revenues		Intersegment revenues, net			Corporate Items, net			Direct revenues
Technical Services	$	254,487	$	40,001		$	408		$	294,896		$	229,130	$	35,578		$	667		$	265,375
Industrial and Field Services	167,899		(9,067		)	(133		)	158,699			164,641		(7,922		)	(303		)	156,416
Safety-Kleen	302,956		(31,639		)	(2		)	271,315			277,715		(29,092		)	1			248,624
Oil, Gas and Lodging Services	27,245		705			45			27,995			24,860		1,436			79			26,375
Corporate Items	201		—			(318		)	(117		)	1,164		—			(444		)	720
Total	$	752,788	$	—		$	—		$	752,788		$	697,510	$	—		$	—		$	697,510

	For the Six Months Ended June 30, 2017											For the Six Months Ended June 30, 2016
	Third party revenues		Intersegment revenues, net			Corporate Items, net			Direct revenues			Third party revenues		Intersegment revenues, net			Corporate Items, net			Direct revenues
Technical Services	$	484,705	$	80,045		$	1,130		$	565,880		$	448,235	$	70,422		$	1,055		$	519,712
Industrial and Field Services	301,456		(17,426		)	(29		)	284,001			294,828		(14,597		)	(316		)	279,915
Safety-Kleen	595,857		(63,708		)	1			532,150			524,676		(57,613		)	367			467,430
Oil, Gas and Lodging Services	59,377		1,089			139			60,605			63,911		1,788			183			65,882
Corporate Items	334		—			(1,241		)	(907		)	1,943		—			(1,289		)	654
Total	$	1,441,729	$	—		$	—		$	1,441,729		$	1,333,593	$	—		$	—		$	1,333,593

Reconciliation to consolidated statements of income from adjusted EBITDA

The following table presents Adjusted EBITDA information used by management by reported segment (in thousands):

	For the Three Months Ended						For the Six Months Ended
	June 30,						June 30,
	2017			2016			2017			2016
Adjusted EBITDA:
Technical Services	$	73,080		$	68,891		$	131,567		$	129,289
Industrial and Field Services	21,484			19,960			23,397			20,393
Safety-Kleen	60,281			55,234			112,649			95,289
Oil, Gas and Lodging Services	268			(1,199		)	58			111
Corporate Items	(34,422		)	(32,441		)	(66,845		)	(67,317		)
Total	$	120,691		$	110,445		$	200,826		$	177,765
Reconciliation to Consolidated Statements of Operations:
Accretion of environmental liabilities	2,416			2,548			4,706			5,053
Depreciation and amortization	71,531			73,393			143,943			142,295
Income from operations	46,744			34,504			52,177			30,417
Other expense	833			189			2,382			539
Loss on early extinguishment of debt	6,045			—			6,045			—
Gain on sale of business	(31,722		)	—			(31,722		)	—
Interest expense, net of interest income	22,492			21,647			45,068			40,627
Income (loss) before provision for income taxes	$	49,096		$	12,668		$	30,404		$	(10,749	)

PP&E, intangible assets and total assets by segment

The following table presents certain assets by reportable segment and in the aggregate (in thousands):

	June 30, 2017
	Technical Services		Industrial and Field Services		Safety-Kleen		Oil, Gas and Lodging Services		Corporate Items		Totals
Property, plant and equipment, net	$	512,058	$	243,195	$	590,282	$	181,001	$	75,917	$	1,602,453
Goodwill	59,973		108,583		304,263		—		—		472,819
Permits and other intangibles, net	76,022		17,135		381,020		8,651		—		482,828
Total assets	$	851,852	$	457,253	$	1,477,660	$	246,195	$	773,322	$	3,806,282

	December 31, 2016
	Technical Services		Industrial and Field Services		Safety-Kleen		Oil, Gas and Lodging Services		Corporate Items		Totals
Property, plant and equipment, net	$	521,134	$	245,143	$	584,647	$	182,038	$	78,865	$	1,611,827
Goodwill	61,116		107,968		296,070		—		—		465,154
Permits and other intangibles, net	78,625		17,817		391,390		10,889		—		498,721
Total assets	$	862,957	$	446,826	$	1,474,755	$	253,242	$	644,140	$	3,681,920

Total assets by geographical area

The following table presents total assets by geographical area (in thousands):

	June 30, 2017		December 31, 2016
United States	$	3,088,199	$	2,960,337
Canada	718,083		721,583
Total	$	3,806,282	$	3,681,920

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GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION (Tables)

6 Months Ended

Jun. 30, 2017

Guarantor and Non-Guarantor Subsidiaries Financial Information [Abstract]

Schedule of condensed consolidating balance sheet

Following is the condensed consolidating balance sheet at June 30, 2017 (in thousands):

	Clean Harbors, Inc.		Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Consolidating Adjustments			Total
Assets:
Cash and cash equivalents	$	51,391	$	303,996	$	90,979	$	—		$	446,366
Intercompany receivables	220,885		314,705		38,312		(573,902		)	—
Accounts receivables, net	—		419,338		93,037		—			512,375
Other current assets	897		222,283		59,658		(6,845		)	275,993
Property, plant and equipment, net	—		1,198,630		403,823		—			1,602,453
Investments in subsidiaries	2,893,232		570,837		—		(3,464,069		)	—
Intercompany debt receivable	—		89,441		24,701		(114,142		)	—
Goodwill	—		416,775		56,044		—			472,819
Permits and other intangibles, net	—		421,793		61,035		—			482,828
Other long-term assets	2,363		7,555		4,598		(1,068		)	13,448
Total assets	$	3,168,768	$	3,965,353	$	832,187	$	(4,160,026	)	$	3,806,282
Liabilities and Stockholders’ Equity:
Current liabilities	$	123,095	$	375,919	$	127,131	$	(6,845	)	$	619,300
Intercompany payables	314,530		257,453		1,919		(573,902		)	—
Closure, post-closure and remedial liabilities, net	—		145,777		16,475		—			162,252
Long-term obligations	1,626,505		—		—		—			1,626,505
Intercompany debt payable	3,701		21,000		89,441		(114,142		)	—
Other long-term liabilities	—		278,833		19,523		(1,068		)	297,288
Total liabilities	2,067,831		1,078,982		254,489		(695,957		)	2,705,345
Stockholders’ equity	1,100,937		2,886,371		577,698		(3,464,069		)	1,100,937
Total liabilities and stockholders’ equity	$	3,168,768	$	3,965,353	$	832,187	$	(4,160,026	)	$	3,806,282

Following is the condensed consolidating balance sheet at December 31, 2016 (in thousands):

	Clean Harbors, Inc.		Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Consolidating Adjustments			Total
Assets:
Cash and cash equivalents	$	51,417	$	155,943	$	99,637	$	—		$	306,997
Intercompany receivables	200,337		354,836		49,055		(604,228		)	—
Accounts receivables, net	—		417,029		79,197		—			496,226
Other current assets	3,096		234,408		69,257		(17,113		)	289,648
Property, plant and equipment, net	—		1,211,210		400,617		—			1,611,827
Investments in subsidiaries	2,851,571		580,124		—		(3,431,695		)	—
Intercompany debt receivable	—		86,409		24,701		(111,110		)	—
Goodwill	—		412,638		52,516		—			465,154
Permits and other intangibles, net	—		435,594		63,127		—			498,721
Other long-term assets	2,446		7,582		4,387		(1,068		)	13,347
Total assets	$	3,108,867	$	3,895,773	$	842,494	$	(4,165,214	)	$	3,681,920
Liabilities and Stockholders’ Equity:
Current liabilities	$	21,805	$	366,831	$	133,145	$	(17,113	)	$	504,668
Intercompany payables	365,848		237,058		1,322		(604,228		)	—
Closure, post-closure and remedial liabilities, net	—		150,682		15,640		—			166,322
Long-term obligations	1,633,272		—		—		—			1,633,272
Intercompany debt payable	3,701		21,000		86,409		(111,110		)	—
Other long-term liabilities	—		275,649		18,836		(1,068		)	293,417
Total liabilities	2,024,626		1,051,220		255,352		(733,519		)	2,597,679
Stockholders’ equity	1,084,241		2,844,553		587,142		(3,431,695		)	1,084,241
Total liabilities and stockholders’ equity	$	3,108,867	$	3,895,773	$	842,494	$	(4,165,214	)	$	3,681,920

Schedule of condensed consolidating statement of income

Following is the consolidating statement of operations for the three months ended June 30, 2017 (in thousands):

	Clean Harbors, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues
Service revenues	$	—		$	474,801		$	147,924		$	(11,785	)	$	610,940
Product revenues	—			125,859			18,730			(2,741		)	141,848
Total revenues	—			600,660			166,654			(14,526		)	752,788
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	—			306,960			117,181			(11,785		)	412,356
Product cost of revenues	—			98,645			11,543			(2,741		)	107,447
Total cost of revenues	—			405,605			128,724			(14,526		)	519,803
Selling, general and administrative expenses	27			92,504			19,763			—			112,294
Accretion of environmental liabilities	—			2,181			235			—			2,416
Depreciation and amortization	—			51,937			19,594			—			71,531
(Loss) income from operations	(27		)	48,433			(1,662		)	—			46,744
Other expense	(76		)	(406		)	(351		)	—			(833		)
Loss on early extinguishment of debt	(6,045		)	—			—			—			(6,045		)
Gain on sale of business	—			31,722			—			—			31,722
Interest (expense) income	(22,614		)	240			(118		)	—			(22,492		)
Equity in earnings of subsidiaries, net of taxes	43,167			(5,332		)	—			(37,835		)	—
Intercompany interest income (expense)	—			1,268			(1,268		)	—			—
Income (loss) before (benefit) provision for income taxes	14,405			75,925			(3,399		)	(37,835		)	49,096
(Benefit) provision for income taxes	(11,475		)	31,981			2,710			—			23,216
Net income (loss)	25,880			43,944			(6,109		)	(37,835		)	25,880
Other comprehensive income	15,098			15,098			12,837			(27,935		)	15,098
Comprehensive income	$	40,978		$	59,042		$	6,728		$	(65,770	)	$	40,978

Following is the consolidating statement of operations for the three months ended June 30, 2016 (in thousands):

	Clean Harbors, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues
Service revenues	$	—		$	456,013		$	139,413		$	(10,864	)	$	584,562
Product revenues	—			95,648			19,391			(2,091		)	112,948
Total revenues	—			551,661			158,804			(12,955		)	697,510
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	(587		)	292,343			107,792			(10,864		)	388,684
Product cost of revenues	—			79,108			14,301			(2,091		)	91,318
Total cost of revenues	(587		)	371,451			122,093			(12,955		)	480,002
Selling, general and administrative expenses	37			83,882			23,144			—			107,063
Accretion of environmental liabilities	—			2,313			235			—			2,548
Depreciation and amortization	—			50,696			22,697			—			73,393
Income (loss) from operations	550			43,319			(9,365		)	—			34,504
Other income (expense)	—			400			(589		)	—			(189		)
Interest (expense) income	(22,962		)	1,284			31			—			(21,647		)
Equity in earnings of subsidiaries, net of taxes	17,413			(9,195		)	—			(8,218		)	—
Intercompany interest income (expense)	—			5,497			(5,497		)	—			—
(Loss) income before (benefit) provision for income taxes	(4,999		)	41,305			(15,420		)	(8,218		)	12,668
(Benefit) provision for income taxes	(8,965		)	23,892			(6,225		)	—			8,702
Net income (loss)	3,966			17,413			(9,195		)	(8,218		)	3,966
Other comprehensive loss	(1,178		)	(1,178		)	(597		)	1,775			(1,178		)
Comprehensive income (loss)	$	2,788		$	16,235		$	(9,792	)	$	(6,443	)	$	2,788

Following is the consolidating statement of operations for the six months ended June 30, 2017 (in thousands):

	Clean Harbors, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues
Service revenues	$	—		$	918,106		$	278,995		$	(25,947	)	$	1,171,154
Product revenues	—			242,509			34,061			(5,995		)	270,575
Total revenues	—			1,160,615			313,056			(31,942		)	1,441,729
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	—			601,105			228,285			(25,947		)	803,443
Product cost of revenues	—			195,150			23,790			(5,995		)	212,945
Total cost of revenues	—			796,255			252,075			(31,942		)	1,016,388
Selling, general and administrative expenses	51			184,675			39,789			—			224,515
Accretion of environmental liabilities	—			4,236			470			—			4,706
Depreciation and amortization	—			103,837			40,106			—			143,943
(Loss) income from operations	(51		)	71,612			(19,384		)	—			52,177
Other expense	(222		)	(1,795		)	(365		)	—			(2,382		)
Loss on early extinguishment of debt	(6,045		)	—			—			—			(6,045		)
Gain on sale of business	—			31,722			—			—			31,722
Interest (expense) income	(45,273		)	359			(154		)	—			(45,068		)
Equity in earnings of subsidiaries, net of taxes	35,530			(27,156		)	—			(8,374		)	—
Intercompany interest income (expense)	—			2,565			(2,565		)	—			—
(Loss) income before (benefit) provision for income taxes	(16,061		)	77,307			(22,468		)	(8,374		)	30,404
(Benefit) provision for income taxes	(20,548		)	41,618			4,847			—			25,917
Net income (loss)	4,487			35,689			(27,315		)	(8,374		)	4,487
Other comprehensive income	21,149			21,149			17,869			(39,018		)	21,149
Comprehensive income (loss)	$	25,636		$	56,838		$	(9,446	)	$	(47,392	)	$	25,636

Following is the consolidating statement of operations for the six months ended June 30, 2016 (in thousands):

	Clean Harbors, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues
Service revenues	$	—		$	884,490		$	253,436		$	(23,133	)	$	1,114,793
Product revenues	—			185,236			38,104			(4,540		)	218,800
Total revenues	—			1,069,726			291,540			(27,673		)	1,333,593
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	(587		)	575,307			211,083			(23,133		)	762,670
Product cost of revenues	—			158,462			27,689			(4,540		)	181,611
Total cost of revenues	(587		)	733,769			238,772			(27,673		)	944,281
Selling, general and administrative expenses	61			164,537			46,949			—			211,547
Accretion of environmental liabilities	—			4,603			450			—			5,053
Depreciation and amortization	—			99,391			42,904			—			142,295
Income (loss) from operations	526			67,426			(37,535		)	—			30,417
Other income (expense)	—			312			(851		)	—			(539		)
Interest (expense) income	(43,105		)	2,395			83			—			(40,627		)
Equity in earnings of subsidiaries, net of taxes	8,642			(35,690		)	—			27,048			—
Intercompany interest income (expense)	—			10,656			(10,656		)	—			—
(Loss) income before (benefit) provision for income taxes	(33,937		)	45,099			(48,959		)	27,048			(10,749		)
(Benefit) provision for income taxes	(17,032		)	36,457			(13,269		)	—			6,156
Net (loss) income	(16,905		)	8,642			(35,690		)	27,048			(16,905		)
Other comprehensive income	44,659			44,659			28,330			(72,989		)	44,659
Comprehensive income (loss)	$	27,754		$	53,301		$	(7,360	)	$	(45,941	)	$	27,754

Schedule of condensed consolidating statement of cash flows

Following is the condensed consolidating statement of cash flows for the six months ended June 30, 2017 (in thousands):

	Clean Harbors, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Net cash (used in) from operating activities	$	(93,808	)	$	206,496		$	4,243		$	—		$	116,931
Cash flows from (used in) investing activities:
Additions to property, plant and equipment	—			(75,152		)	(13,590		)	—			(88,742		)
Proceeds from sales of fixed assets	—			984			1,137			—			2,121
Acquisitions, net of cash acquired	—			(9,277		)	—			—			(9,277		)
Proceeds on sale of businesses, net of transactional costs	—			46,210			181			—			46,391
Additions to intangible assets, including costs to obtain or renew permits	—			(888		)	(351		)	—			(1,239		)
Proceeds from sale of investments	376			—			—			—			376
Intercompany	—			(14,343		)	—			14,343			—
Net cash from (used in) investing activities	376			(52,466		)	(12,623		)	14,343			(50,370		)
Cash flows from (used in) financing activities:
Change in uncashed checks	—			(5,977		)	(2,384		)	—			(8,361		)
Proceeds from exercise of stock options	46			—			—			—			46
Issuance of restricted shares, net of shares remitted	(2,132		)	—			—			—			(2,132		)
Repurchases of common stock	(12,257		)	—			—			—			(12,257		)
Deferred financing costs paid	(4,727		)	—			—			—			(4,727		)
Premiums paid on early extinguishment of debt	(4,665		)	—			—			—			(4,665		)
Principal payment on debt	(296,202		)	—			—			—			(296,202		)
Issuance of senior secured notes, net of discount	399,000			—			—			—			399,000
Intercompany	14,343			—			—			(14,343		)	—
Net cash from (used in) financing activities	93,406			(5,977		)	(2,384		)	(14,343		)	70,702
Effect of exchange rate change on cash	—			—			2,106			—			2,106
(Decrease) increase in cash and cash equivalents	(26		)	148,053			(8,658		)	—			139,369
Cash and cash equivalents, beginning of period	51,417			155,943			99,637			—			306,997
Cash and cash equivalents, end of period	$	51,391		$	303,996		$	90,979		$	—		$	446,366

Following is the condensed consolidating statement of cash flows for the six months ended June 30, 2016 (in thousands):

	Clean Harbors, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Net cash from operating activities	$	42,990		$	65,860		$	11,201		$	—		$	120,051
Cash flows used in investing activities:
Additions to property, plant and equipment	—			(105,175		)	(18,354		)	—			(123,529		)
Proceeds from sales of fixed assets	—			694			1,974			—			2,668
Acquisitions, net of cash acquired	—			(48,989		)	(10,000		)	—			(58,989		)
Additions to intangible assets, including costs to obtain or renew permits	—			(908		)	(65		)	—			(973		)
Purchases of available-for-sale securities	(102		)	—			(496		)	—			(598		)
Intercompany	—			(11,827		)	—			11,827			—
Investment in subsidiaries	(250,625		)	—			—			250,625			—
Net cash used in investing activities	(250,727		)	(166,205		)	(26,941		)	262,452			(181,421		)
Cash flows from (used in) financing activities:
Change in uncashed checks	—			(9,266		)	(1,756		)	—			(11,022		)
Proceeds from exercise of stock options	184			—			—			—			184
Issuance of restricted shares, net of shares remitted	(1,879		)	—			—			—			(1,879		)
Repurchases of common stock	(10,134		)	—			—			—			(10,134		)
Excess tax benefit of stock-based compensation	2			—			—			—			2
Deferred financing costs paid	(2,614		)	—			—			—			(2,614		)
Issuance of senior unsecured notes, including premium	250,625			250,625			—			(250,625		)	250,625
Intercompany	11,827			—			—			(11,827		)	—
Net cash from (used in) financing activities	248,011			241,359			(1,756		)	(262,452		)	225,162
Effect of exchange rate change on cash	—			—			4,423			—			4,423
Increase (decrease) in cash and cash equivalents	40,274			141,014			(13,073		)	—			168,215
Cash and cash equivalents, beginning of period	11,017			83,479			90,212			—			184,708
Cash and cash equivalents, end of period	$	51,291		$	224,493		$	77,139		$	—		$	352,923

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SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2017 segment	Dec. 31, 2016 USD ($)
Accounting Policies [Abstract]
Number of operating segments | segment	6
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of change in accounting for stock based compensation		$ 231
Accumulated Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of change in accounting for stock based compensation		(450)
Accumulated Earnings | Accounting Standards Updated 2016-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of change in accounting for stock based compensation		$ (500)

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BUSINESS COMBINATIONS (Narrative) (Details) $ in Thousands		6 Months Ended	12 Months Ended
	Jan. 31, 2017 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2016 USD ($) rerefinery acquisition
Business Acquisition [Line Items]
Goodwill recognized		$ 4,916
2017 Acquisitions
Business Acquisition [Line Items]
Purchase price	$ 11,900
Goodwill recognized	$ 4,900
2016 Acquisitions
Business Acquisition [Line Items]
Purchase price			$ 204,800
Number of acquisitions | acquisition			7
Number of re-refineries acquired | rerefinery			3

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BUSINESS COMBINATIONS (Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Goodwill	$ 472,819	$ 465,154
2016 Acquisitions
Business Acquisition [Line Items]
Accounts receivable	16,242
Measurement period adjustments, accounts receivable	475
Inventories and supplies	12,688
Measurement period adjustment, inventories and supplies	173
Prepaid and other current assets	752
Measurement period adjustment, prepaid and other current assets	(25)
Property, plant and equipment	143,916
Measurement period adjustments, property, plant and equipment	891
Permits and other intangibles	28,856
Measurement period adjustments, permits and other intangibles	0
Current liabilities	(19,905)
Measurement period adjustments, current liabilities	353
Closure and post-closure liabilities	(3,004)
Measurement period adjustments, closure and post-closure liabilities	(596)
Remedial liabilities, less current portion	(2,545)
Measurement period adjustments, remedial liabilities, less current portion	(504)
Deferred taxes, unrecognized tax benefits and other long-term liabilities	(20,219)
Measurement period adjustments, deferred taxes, unrecognized tax benefits and other long-term liabilities	(3,200)
Total identifiable net assets	156,781
Measurement period adjustments, total identifiable net assets	(2,433)
Goodwill	47,977
Measurement period adjustments, goodwill	2,186
Total purchase price, net of cash acquired	204,758
Measurement period adjustments, total purchase price, net of cash acquired	$ (247)
At Acquisition Dates As Reported December 31, 2016 | 2016 Acquisitions
Business Acquisition [Line Items]
Accounts receivable		15,767
Inventories and supplies		12,515
Prepaid and other current assets		777
Property, plant and equipment		143,025
Permits and other intangibles		28,856
Current liabilities		(20,258)
Closure and post-closure liabilities		(2,408)
Remedial liabilities, less current portion		(2,041)
Deferred taxes, unrecognized tax benefits and other long-term liabilities		(17,019)
Total identifiable net assets		159,214
Goodwill		45,791
Total purchase price, net of cash acquired		$ 205,005

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DISPOSITION OF BUSINESS (Narrative) (Details) - Transformer Services $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds, net of transactional related costs		$ 44.4
Transactional related costs		2.1
Pre-tax gain		31.7
Disposal Group, Disposed of by Sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Final sale proceeds	$ 46.5	$ 46.5
Proceeds, net of transactional related costs	44.4
Transactional related costs	2.1
Pre-tax gain	$ 31.7

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DISPOSITION OF BUSINESS (Summary of Carry Amounts of Transformer Services) (Details) - Transformer Services - Disposal Group, Disposed of by Sale, Not Discontinued Operations $ in Thousands	Jun. 30, 2017 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total current assets	$ 7,216
Property, plant and equipment, net	8,773
Total other assets	1,681
Total assets divested	17,670
Total current liabilities	3,849
Total other liabilities	1,170
Total liabilities divested	5,019
Net carrying value divested	$ 12,651

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DISPOSITION OF BUSINESS (Income (Loss) Attributable to Transformer Services) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Transformer 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]
Income before provision for income taxes	$ 1,873	$ 986	$ 2,771	$ 1,793

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DISPOSITION OF BUSINESS (Income (Loss) Attributable to Catalyst Services) (Details) - Catalyst Services - Disposal Group, Disposed of by Sale, Not Discontinued Operations - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2016	Jun. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Final sale proceeds			$ 2,000
Income before provision for income taxes	$ 2,607	$ 1,508

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INVENTORIES AND SUPPLIES (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Inventory Disclosure [Abstract]
Oil and oil products	$ 57,554	$ 57,554		$ 52,158
Supplies and drums	92,995	92,995		90,610
Solvent and solutions	8,575	8,575		8,566
Modular camp accommodations	2,699	2,699		15,255
Other	10,717	10,717		11,839
Total inventories and supplies	172,540	172,540		$ 178,428
Transfer of inventory to property, plant and equipment	$ 12,600	$ 12,641	$ 0

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PROPERTY, PLANT AND EQUIPMENT (Schedule of Property, Plant and Equipment) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	$ 3,083,169	$ 2,977,904
Less - accumulated depreciation and amortization	1,480,716	1,366,077
Total property, plant and equipment, net	1,602,453	1,611,827
Land
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	121,114	120,575
Asset retirement costs (non-landfill)
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	14,861	14,567
Landfill assets
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	141,878	139,708
Buildings and improvements
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	406,030	373,160
Camp equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	168,524	152,740
Vehicles
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	564,723	541,022
Equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	1,605,581	1,483,736
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	5,524	5,492
Construction in progress
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	$ 54,934	$ 146,904

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PROPERTY, PLANT AND EQUIPMENT (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Property, Plant and Equipment [Abstract]
Interest costs capitalized adjustment	$ 0.1	$ 1.3	$ 0.2	$ 2.5
Depreciation inclusive of amortization	$ 61.8	$ 63.5	$ 125.2	$ 122.8

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GOODWILL AND OTHER INTANGIBLE ASSETS (Rollforward of Goodwill) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2017 USD ($)
Goodwill [Roll Forward]
Balance at beginning of year	$ 465,154
Increase from current period acquisitions	4,916
Measurement period adjustments from prior period acquisitions	2,186
Decrease from disposition of business	(1,300)
Foreign currency translation and other	1,863
Balance at end of year	472,819
Technical Services
Goodwill [Roll Forward]
Balance at beginning of year	61,116
Balance at end of year	59,973
Industrial and Field Services
Goodwill [Roll Forward]
Balance at beginning of year	107,968
Balance at end of year	108,583
Safety-Kleen
Goodwill [Roll Forward]
Balance at beginning of year	296,070
Balance at end of year	304,263
Oil, Gas and Lodging Services
Goodwill [Roll Forward]
Balance at beginning of year	0
Balance at end of year	0
Operating Segments | Technical Services
Goodwill [Roll Forward]
Balance at beginning of year	61,116
Increase from current period acquisitions	0
Measurement period adjustments from prior period acquisitions	0
Decrease from disposition of business	(1,300)
Foreign currency translation and other	157
Balance at end of year	59,973
Operating Segments | Industrial and Field Services
Goodwill [Roll Forward]
Balance at beginning of year	107,968
Increase from current period acquisitions	0
Measurement period adjustments from prior period acquisitions	0
Decrease from disposition of business	0
Foreign currency translation and other	615
Balance at end of year	108,583
Operating Segments | Safety-Kleen
Goodwill [Roll Forward]
Balance at beginning of year	296,070
Increase from current period acquisitions	4,916
Measurement period adjustments from prior period acquisitions	2,186
Decrease from disposition of business	0
Foreign currency translation and other	1,091
Balance at end of year	304,263
Operating Segments | Oil, Gas and Lodging Services
Goodwill [Roll Forward]
Balance at beginning of year	0
Increase from current period acquisitions	0
Measurement period adjustments from prior period acquisitions	0
Decrease from disposition of business
Foreign currency translation and other	0
Balance at end of year	$ 0

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GOODWILL AND OTHER INTANGIBLE ASSETS (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of permits and other intangible assets	$ 9.7	$ 9.9	$ 18.8	$ 19.5

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GOODWILL AND OTHER INTANGIBLE ASSETS (Amortizable Other Intangible Assets) (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Cost	$ 603,758	$ 599,317
Accumulated Amortization	243,902	223,219
Net	$ 359,856	$ 376,098
Weighted Average Remaining Amortization Period (in years)	14 years 165 days	13 years 9 months 40 days
Total permits and other intangible assets, Cost	$ 726,730	$ 721,940
Total permits and other intangible assets, Net	482,828	498,721
Trademarks and trade names
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Trademarks and trade names	122,972	122,623
Permits
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Cost	173,174	171,637
Accumulated Amortization	70,698	67,301
Net	$ 102,476	$ 104,336
Weighted Average Remaining Amortization Period (in years)	21 years 130 days	18 years 9 months 40 days
Customer and supplier relationships
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Cost	$ 395,911	$ 393,426
Accumulated Amortization	143,038	127,462
Net	$ 252,873	$ 265,964
Weighted Average Remaining Amortization Period (in years)	11 years 340 days	12 years 2 months
Other intangible assets
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Cost	$ 34,673	$ 34,254
Accumulated Amortization	30,166	28,456
Net	$ 4,507	$ 5,798
Weighted Average Remaining Amortization Period (in years)	7 years 175 days	7 years 1 month

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GOODWILL AND OTHER INTANGIBLE ASSETS (Expected Future Amortization) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
2017 (six months)	$ 18,078
2018	34,091
2019	31,238
2020	28,756
2021	26,557
Thereafter	221,136
Net	$ 359,856	$ 376,098

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ACCRUED EXPENSES (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Payables and Accruals [Abstract]
Insurance	$ 58,816	$ 63,061
Interest	15,006	21,536
Accrued compensation and benefits	45,159	34,641
Income, real estate, sales and other taxes	37,474	35,083
Other	35,040	36,400
Total accrued expenses	191,495	190,721
Accrued legal matters	3,100	3,800
Accrued severance charges	$ 1,800	$ 2,900

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CLOSURE AND POST-CLOSURE LIABILITIES (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2017 USD ($)
Changes to post-closure liabilities
Beginning balance	$ 58,331
Measurement period adjustments from prior period acquisitions	596
New asset retirement obligations	894
Adjustment related to disposition of business	(1,170)
Accretion	2,364
Changes in estimates recorded to statement of operations	(262)
Changes in estimates recorded to balance sheet	(287)
Expenditures	(810)
Currency translation and other	137
Ending balance	$ 59,793
Credit-adjusted risk-free rate	6.32%
Landfill Retirement Liability
Changes to post-closure liabilities
Beginning balance	$ 30,630
Measurement period adjustments from prior period acquisitions	0
New asset retirement obligations	894
Adjustment related to disposition of business	0
Accretion	1,094
Changes in estimates recorded to statement of operations	0
Changes in estimates recorded to balance sheet	0
Expenditures	(556)
Currency translation and other	82
Ending balance	32,144
Non-Landfill Retirement Liability
Changes to post-closure liabilities
Beginning balance	27,701
Measurement period adjustments from prior period acquisitions	596
New asset retirement obligations	0
Adjustment related to disposition of business	(1,170)
Accretion	1,270
Changes in estimates recorded to statement of operations	(262)
Changes in estimates recorded to balance sheet	(287)
Expenditures	(254)
Currency translation and other	55
Ending balance	$ 27,649

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REMEDIAL LIABILITIES (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2017 USD ($)
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at beginning of year	$ 128,007
Measurement period adjustments from prior period acquisitions	504
Accretion	2,342
Changes in estimates recorded to statement of operations	133
Expenditures	(5,292)
Currency translation and other	465
Balance at end of year	126,159
Remedial Liabilities for Landfill Sites
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at beginning of year	1,777
Measurement period adjustments from prior period acquisitions	0
Accretion	43
Changes in estimates recorded to statement of operations	(36)
Expenditures	(19)
Currency translation and other	(1)
Balance at end of year	1,764
Remedial Liabilities for Inactive Sites
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at beginning of year	64,151
Measurement period adjustments from prior period acquisitions	0
Accretion	1,332
Changes in estimates recorded to statement of operations	(120)
Expenditures	(2,068)
Currency translation and other	2,712
Balance at end of year	66,007
Remedial Liabilities (Including Superfund) for Non-Landfill Operations
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at beginning of year	62,079
Measurement period adjustments from prior period acquisitions	504
Accretion	967
Changes in estimates recorded to statement of operations	289
Expenditures	(3,205)
Currency translation and other	(2,246)
Balance at end of year	$ 58,388

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FINANCING ARRANGEMENTS (Summary of Financing Arrangements) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Current portion of long-term obligations	$ 107,798	$ 0
Long-term obligations	1,641,000	1,645,000
Unamortized debt issuance costs and debt discount/premium, net	(14,495)	(11,728)
Long-term obligations, at carrying value	1,626,505	1,633,272
Total current and long-term obligations, at carrying value	1,734,303	1,633,272
Secured debt | Term Loan Agreement
Debt Instrument [Line Items]
Current portion of long-term obligations	4,000	0
Long-term obligations	396,000	0
Unsecured debt | Senior unsecured notes, at 5.25%, due August 1, 2020
Debt Instrument [Line Items]
Current portion of long-term obligations	103,798	0
Long-term obligations	$ 400,000	800,000
Senior unsecured notes interest rate percentage	5.25%
Unsecured debt | Senior unsecured notes, at 5.125%, due June 1, 2021 (2021 Notes)
Debt Instrument [Line Items]
Long-term obligations	$ 845,000	$ 845,000
Senior unsecured notes interest rate percentage	5.125%

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FINANCING ARRANGEMENTS (Narrative) (Details) - USD ($)	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Debt Instrument [Line Items]
Premiums to repay debt early	$ 4,665,000	$ 0
Outstanding loan balances	0		$ 0
Available to borrow and outstanding letters of credit	225,300,000		195,200,000
Outstanding letters of credit	125,900,000		132,600,000
Secured debt | Term Loan Agreement
Debt Instrument [Line Items]
Senior secured credit agreement amount	$ 400,000,000.0
Prepayment premium	1.00%
Effective interest rate	3.23%
Amount used to repurchase notes	$ 312,600,000
Repurchased amount	296,200,000
Accrued interest paid	6,400,000
Premiums to repay debt early	4,700,000
Expenses incurred from financing	5,300,000
Debt fair value	400,000,000
Unsecured debt | Senior unsecured notes, at 5.25%, due August 1, 2020
Debt Instrument [Line Items]
Senior secured credit agreement amount	503,800,000
Repurchased amount	$ 103,800,000
Redemption price percentage	101.313%
Debt fair value	$ 510,700,000		820,000,000
Unsecured debt | Senior unsecured notes, at 5.125%, due June 1, 2021 (2021 Notes)
Debt Instrument [Line Items]
Debt fair value	863,000,000		861,900,000
Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Revolving credit facility maximum borrowing capacity	$ 400,000,000		$ 400,000,000
Eurodollar | Term Loan Agreement
Debt Instrument [Line Items]
Basis spread on variable rate	2.00%
Base Rate | Term Loan Agreement
Debt Instrument [Line Items]
Basis spread on variable rate	1.00%
Minimum | Base Rate | Term Loan Agreement
Debt Instrument [Line Items]
Basis spread on variable rate	0.00%

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EARNINGS (LOSS) PER SHARE (Computation of Basic and Diluted Earnings Per Share)(Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Numerator for basic and diluted earnings (loss) per share:
Net income (loss)	$ 25,880	$ 3,966	$ 4,487	$ (16,905)
Denominator:
Basic shares outstanding (in shares)	57,190	57,549	57,226	57,599
Dilutive effect of equity-based compensation awards (in shares)	146	129	123	0
Dilutive shares outstanding (in shares)	57,336	57,678	57,349	57,599
Basic loss per share (in USD per share)	$ 0.45	$ 0.07	$ 0.08	$ (0.29)
Diluted loss per share (in USD per share)	$ 0.45	$ 0.07	$ 0.08	$ (0.29)

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EARNINGS (LOSS) PER SHARE (Narrative) (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from computation of earning per share (in shares)				886,685
Performance Shares [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from computation of earning per share (in shares)	142,503	348,197	142,503
Restricted Stock Units (RSUs) [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from computation of earning per share (in shares)	14,699	9,537	21,013

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ACCUMULATED OTHER COMPREHENSIVE LOSS (Changes in Accumulated Other Comprehensive Loss by Component) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2017 USD ($)
Components of Other Accumulated Income, Net of Tax [Roll Forward]
Balance at beginning of period	$ 1,084,241
Other comprehensive income before reclassifications	21,128
Amounts reclassified out of accumulated other comprehensive loss	222
Tax effects	(201)
Other comprehensive income	21,149
Balance at end of period	1,100,937
Foreign Currency Translation
Components of Other Accumulated Income, Net of Tax [Roll Forward]
Balance at beginning of period	(212,211)
Other comprehensive income before reclassifications	20,847
Amounts reclassified out of accumulated other comprehensive loss	0
Tax effects
Other comprehensive income	20,847
Balance at end of period	(191,364)
Unrealized Gains on Available-For-Sale Securities
Components of Other Accumulated Income, Net of Tax [Roll Forward]
Balance at beginning of period	(321)
Other comprehensive income before reclassifications	281
Amounts reclassified out of accumulated other comprehensive loss	222
Tax effects	(201)
Other comprehensive income	302
Balance at end of period	(19)
Unfunded Pension Liability
Components of Other Accumulated Income, Net of Tax [Roll Forward]
Balance at beginning of period	(1,794)
Other comprehensive income before reclassifications	0
Amounts reclassified out of accumulated other comprehensive loss	0
Tax effects	0
Other comprehensive income	0
Balance at end of period	(1,794)
Total
Components of Other Accumulated Income, Net of Tax [Roll Forward]
Balance at beginning of period	(214,326)
Balance at end of period	$ (193,177)

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ACCUMULATED OTHER COMPREHENSIVE LOSS (Reclassified Out of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Unrealized holding gains on available-for-sale investments	$ (833)	$ (189)	$ (2,382)	$ (539)
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Unrealized holding gains on available-for-sale investments	$ 76	$ 0	$ 222	$ 0

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STOCK-BASED COMPENSATION (Narrative) (Details) - USD ($) shares in Millions	3 Months Ended		6 Months Ended		28 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Mar. 13, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	$ 2,900,000	$ 2,600,000	$ 5,200,000	$ 4,700,000
Income tax benefit	$ 800,000	$ 800,000	$ 1,500,000	$ 1,400,000
Share repurchase program authorized						$ 300,000,000
Repurchases of common stock (in shares)	0.1	0.1	0.2	0.2	4.1
Repurchases of common stock	$ 5,500,000	$ 5,100,000	$ 12,257,000	$ 10,100,000	$ 212,100,000
Stock repurchase program, remaining authorized repurchase amount	87,900,000		87,900,000		87,900,000
Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	23,800,000		$ 23,800,000		23,800,000
Period for recognition (in years)			2 years 225 days
Fair value restricted stock	4,500,000	2,300,000	$ 6,000,000	6,100,000
Performance stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	900,000		900,000		$ 900,000
Fair value restricted stock	$ 0	$ 0	$ 1,400,000	$ 400,000
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)			3 years
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)			5 years

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STOCK-BASED COMPENSATION (Restricted Stock) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Restricted stock awards
Number of Shares
Beginning balance (in shares)			510,041
Granted (in shares)			161,250
Vested (in shares)			(105,064)
Forfeited (in shares)			(34,374)
Ending balance (in shares)	531,853		531,853
Weighted Average Grant-Date Fair Value
Beginning of period (in USD per share)			$ 52.65
Granted (in USD per share)			56.15
Vested (in USD per share)			54.17
Forfeited (in USD per share)			51.50
End of period (in USD per share)	$ 53.49		$ 53.49
Unrecognized compensation cost	$ 23.8		$ 23.8
Period for recognition (in years)			2 years 225 days
Fair value restricted stock	$ 4.5	$ 2.3	$ 6.0	$ 6.1
Minimum
Weighted Average Grant-Date Fair Value
Vesting period (in years)			3 years
Maximum
Weighted Average Grant-Date Fair Value
Vesting period (in years)			5 years

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STOCK-BASED COMPENSATION (Performance Stock Awards (Details) - Performance stock awards - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Number of Shares
Beginning balance (in shares)			220,882
Granted (in shares)			588
Vested (in shares)			(25,168)
Forfeited (in shares)			(16,187)
Ending balance (in shares)	180,115		180,115
Weighted Average Grant-Date Fair Value
Beginning of period (in USD per share)			$ 54.69
Granted (in USD per share)			54.44
Vested (in USD per share)			54.84
Forfeited (in USD per share)			56.24
End of period (in USD per share)	$ 54.70		$ 54.70
Unrecognized compensation cost	$ 0.9		$ 0.9
Fair value restricted stock	$ 0.0	$ 0.0	$ 1.4	$ 0.4

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COMMITMENTS AND CONTINGENCIES (Details) CAD in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2017 USD ($) site proceeding claim	Dec. 31, 2012 CAD	Dec. 31, 1999 municipality	Dec. 31, 1968 permit	Dec. 31, 2016 USD ($)
Contingencies [Line Items]
Recorded reserves for actual or probable liabilities | $	$ 20,800,000				$ 22,000,000
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	17
Legal and Administrative Proceedings
Contingencies [Line Items]
Recorded reserves for actual or probable liabilities | $	$ 17,700,000				18,200,000
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 10.0
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	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	33
Third party sites requiring expenditure on remediation	16
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
Safety-Kleen
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 | $	$ 3,100,000				$ 3,800,000
Number of pending personal injury claims allegedly resulting from the use of Safety-Kleen's products | proceeding	5
Federal and State Enforcement Actions | Minimum
Contingencies [Line Items]
Minimum potential liability | $	$ 100,000

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INCOME TAXES (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Effective income tax rate	47.30%	68.70%	85.20%	(57.30%)
Unrecognized tax benefits	$ 1.8		$ 1.8		$ 1.7
Interest on unrecognized tax benefits	$ 0.4		0.4		$ 0.3
Reduction in unrecognized tax benefits from expiring statue of limitations			$ 0.4

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SEGMENT REPORTING (Narrative) (Details)	6 Months Ended
	Jun. 30, 2017 segment
Segment Reporting [Abstract]
Number of operating segments	6

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SEGMENT REPORTING (Third Party Revenues to Direct Revenues) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information [Line Items]
Total revenues	$ 752,788	$ 697,510	$ 1,441,729	$ 1,333,593
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	752,788	697,510	1,441,729	1,333,593
Technical Services
Segment Reporting Information [Line Items]
Total revenues	254,487	229,130	484,705	448,235
Technical Services | Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	40,001	35,578	80,045	70,422
Technical Services | Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	408	667	1,130	1,055
Technical Services | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	294,896	265,375	565,880	519,712
Industrial and Field Services
Segment Reporting Information [Line Items]
Total revenues	167,899	164,641	301,456	294,828
Industrial and Field Services | Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	(9,067)	(7,922)	(17,426)	(14,597)
Industrial and Field Services | Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	(133)	(303)	(29)	(316)
Industrial and Field Services | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	158,699	156,416	284,001	279,915
Safety-Kleen
Segment Reporting Information [Line Items]
Total revenues	302,956	277,715	595,857	524,676
Safety-Kleen | Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	(31,639)	(29,092)	(63,708)	(57,613)
Safety-Kleen | Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	(2)	1	1	367
Safety-Kleen | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	271,315	248,624	532,150	467,430
Oil, Gas and Lodging Services
Segment Reporting Information [Line Items]
Total revenues	27,245	24,860	59,377	63,911
Oil, Gas and Lodging Services | Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	705	1,436	1,089	1,788
Oil, Gas and Lodging Services | Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	45	79	139	183
Oil, Gas and Lodging Services | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	27,995	26,375	60,605	65,882
Corporate Items
Segment Reporting Information [Line Items]
Total revenues	201	1,164	334	1,943
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	(318)	(444)	(1,241)	(1,289)
Corporate Items | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	$ (117)	$ 720	$ (907)	$ 654

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SEGMENT REPORTING (Adjusted EBITDA Information) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information [Line Items]
Adjusted EBITDA	$ 120,691	$ 110,445	$ 200,826	$ 177,765
Reconciliation to Consolidated Statements of Operations:
Accretion of environmental liabilities	2,416	2,548	4,706	5,053
Depreciation and amortization	71,531	73,393	143,943	142,295
Income from operations	46,744	34,504	52,177	30,417
Other expense	833	189	2,382	539
Loss on early extinguishment of debt	6,045	0	6,045	0
Gain on sale of business	(31,722)	0	(31,722)	0
Interest expense, net of interest income	22,492	21,647	45,068	40,627
Income (loss) before (benefit) provision for income taxes	49,096	12,668	30,404	(10,749)
Technical Services
Segment Reporting Information [Line Items]
Adjusted EBITDA	73,080	68,891	131,567	129,289
Industrial and Field Services
Segment Reporting Information [Line Items]
Adjusted EBITDA	21,484	19,960	23,397	20,393
Safety-Kleen
Segment Reporting Information [Line Items]
Adjusted EBITDA	60,281	55,234	112,649	95,289
Oil, Gas and Lodging Services
Segment Reporting Information [Line Items]
Adjusted EBITDA	268	(1,199)	58	111
Corporate Items
Segment Reporting Information [Line Items]
Adjusted EBITDA	$ (34,422)	$ (32,441)	$ (66,845)	$ (67,317)

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SEGMENT REPORTING (Assets by Reportable Segment) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Property, plant and equipment, net	$ 1,602,453	$ 1,611,827
Goodwill	472,819	465,154
Permits and other intangibles, net	482,828	498,721
Total assets	3,806,282	3,681,920
Technical Services
Segment Reporting Information [Line Items]
Property, plant and equipment, net	512,058	521,134
Goodwill	59,973	61,116
Permits and other intangibles, net	76,022	78,625
Total assets	851,852	862,957
Industrial and Field Services
Segment Reporting Information [Line Items]
Property, plant and equipment, net	243,195	245,143
Goodwill	108,583	107,968
Permits and other intangibles, net	17,135	17,817
Total assets	457,253	446,826
Safety-Kleen
Segment Reporting Information [Line Items]
Property, plant and equipment, net	590,282	584,647
Goodwill	304,263	296,070
Permits and other intangibles, net	381,020	391,390
Total assets	1,477,660	1,474,755
Oil, Gas and Lodging Services
Segment Reporting Information [Line Items]
Property, plant and equipment, net	181,001	182,038
Goodwill	0	0
Permits and other intangibles, net	8,651	10,889
Total assets	246,195	253,242
Corporate Items
Segment Reporting Information [Line Items]
Property, plant and equipment, net	75,917	78,865
Goodwill	0	0
Permits and other intangibles, net	0	0
Total assets	$ 773,322	$ 644,140

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SEGMENT REPORTING (Total Assets by Geographical Area) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Total assets	$ 3,806,282	$ 3,681,920
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total assets	3,088,199	2,960,337
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Total assets	$ 718,083	$ 721,583

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GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION (Narrative) (Details)	6 Months Ended
	Jun. 30, 2017
Guarantor and Non-Guarantor Subsidiaries Financial Information [Abstract]
Ownership percentage of U.S. guarantor subsidiaries	100.00%

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GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION (Condensed Consolidating Balance Sheets) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015
ASSETS
Cash and cash equivalents	$ 446,366	$ 306,997	$ 352,923	$ 184,708
Intercompany receivables	0	0
Accounts receivables, net	512,375	496,226
Other current assets	275,993	289,648
Property, plant and equipment, net	1,602,453	1,611,827
Investments in subsidiaries	0	0
Intercompany debt receivable	0	0
Goodwill	472,819	465,154
Permits and other intangibles, net	482,828	498,721
Other long-term assets	13,448	13,347
Total assets	3,806,282	3,681,920
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities	619,300	504,668
Intercompany payables	0	0
Closure, post-closure and remedial liabilities, net	162,252	166,322
Long-term obligations, less current portion	1,626,505	1,633,272
Intercompany debt payable	0	0
Other long-term liabilities	297,288	293,417
Total liabilities	2,705,345	2,597,679
Stockholders’ equity	1,100,937	1,084,241
Total liabilities and stockholders’ equity	3,806,282	3,681,920
Reportable Legal Entities | Clean Harbors, Inc.
ASSETS
Cash and cash equivalents	51,391	51,417	51,291	11,017
Intercompany receivables	220,885	200,337
Accounts receivables, net	0	0
Other current assets	897	3,096
Property, plant and equipment, net	0	0
Investments in subsidiaries	2,893,232	2,851,571
Intercompany debt receivable	0	0
Goodwill	0	0
Permits and other intangibles, net	0	0
Other long-term assets	2,363	2,446
Total assets	3,168,768	3,108,867
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities	123,095	21,805
Intercompany payables	314,530	365,848
Closure, post-closure and remedial liabilities, net	0	0
Long-term obligations, less current portion	1,626,505	1,633,272
Intercompany debt payable	3,701	3,701
Other long-term liabilities	0	0
Total liabilities	2,067,831	2,024,626
Stockholders’ equity	1,100,937	1,084,241
Total liabilities and stockholders’ equity	3,168,768	3,108,867
Reportable Legal Entities | Guarantor Subsidiaries
ASSETS
Cash and cash equivalents	303,996	155,943	224,493	83,479
Intercompany receivables	314,705	354,836
Accounts receivables, net	419,338	417,029
Other current assets	222,283	234,408
Property, plant and equipment, net	1,198,630	1,211,210
Investments in subsidiaries	570,837	580,124
Intercompany debt receivable	89,441	86,409
Goodwill	416,775	412,638
Permits and other intangibles, net	421,793	435,594
Other long-term assets	7,555	7,582
Total assets	3,965,353	3,895,773
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities	375,919	366,831
Intercompany payables	257,453	237,058
Closure, post-closure and remedial liabilities, net	145,777	150,682
Long-term obligations, less current portion	0	0
Intercompany debt payable	21,000	21,000
Other long-term liabilities	278,833	275,649
Total liabilities	1,078,982	1,051,220
Stockholders’ equity	2,886,371	2,844,553
Total liabilities and stockholders’ equity	3,965,353	3,895,773
Reportable Legal Entities | Non-Guarantor Subsidiaries
ASSETS
Cash and cash equivalents	90,979	99,637	77,139	90,212
Intercompany receivables	38,312	49,055
Accounts receivables, net	93,037	79,197
Other current assets	59,658	69,257
Property, plant and equipment, net	403,823	400,617
Investments in subsidiaries	0	0
Intercompany debt receivable	24,701	24,701
Goodwill	56,044	52,516
Permits and other intangibles, net	61,035	63,127
Other long-term assets	4,598	4,387
Total assets	832,187	842,494
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities	127,131	133,145
Intercompany payables	1,919	1,322
Closure, post-closure and remedial liabilities, net	16,475	15,640
Long-term obligations, less current portion	0	0
Intercompany debt payable	89,441	86,409
Other long-term liabilities	19,523	18,836
Total liabilities	254,489	255,352
Stockholders’ equity	577,698	587,142
Total liabilities and stockholders’ equity	832,187	842,494
Consolidating Adjustments
ASSETS
Cash and cash equivalents	0	0	$ 0	$ 0
Intercompany receivables	(573,902)	(604,228)
Accounts receivables, net	0	0
Other current assets	(6,845)	(17,113)
Property, plant and equipment, net	0	0
Investments in subsidiaries	(3,464,069)	(3,431,695)
Intercompany debt receivable	(114,142)	(111,110)
Goodwill	0	0
Permits and other intangibles, net	0	0
Other long-term assets	(1,068)	(1,068)
Total assets	(4,160,026)	(4,165,214)
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities	(6,845)	(17,113)
Intercompany payables	(573,902)	(604,228)
Closure, post-closure and remedial liabilities, net	0	0
Long-term obligations, less current portion	0	0
Intercompany debt payable	(114,142)	(111,110)
Other long-term liabilities	(1,068)	(1,068)
Total liabilities	(695,957)	(733,519)
Stockholders’ equity	(3,464,069)	(3,431,695)
Total liabilities and stockholders’ equity	$ (4,160,026)	$ (4,165,214)

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GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION (Consolidating Statement of Operations) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenues:
Service revenues	$ 610,940	$ 584,562	$ 1,171,154	$ 1,114,793
Product revenues	141,848	112,948	270,575	218,800
Total revenues	752,788	697,510	1,441,729	1,333,593
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	412,356	388,684	803,443	762,670
Product cost of revenues	107,447	91,318	212,945	181,611
Total cost of revenues	519,803	480,002	1,016,388	944,281
Selling, general and administrative expenses	112,294	107,063	224,515	211,547
Accretion of environmental liabilities	2,416	2,548	4,706	5,053
Depreciation and amortization	71,531	73,393	143,943	142,295
(Loss) income from operations	46,744	34,504	52,177	30,417
Unrealized holding gains on available-for-sale investments	(833)	(189)	(2,382)	(539)
Loss on early extinguishment of debt	(6,045)	0	(6,045)	0
Gain on sale of business	31,722	0	31,722	0
Interest (expense) income	(22,492)	(21,647)	(45,068)	(40,627)
Equity in earnings of subsidiaries, net of taxes	0	0	0	0
Intercompany interest income (expense)	0	0	0	0
Income (loss) before (benefit) provision for income taxes	49,096	12,668	30,404	(10,749)
(Benefit) provision for income taxes	23,216	8,702	25,917	6,156
Net income (loss)	25,880	3,966	4,487	(16,905)
Other comprehensive income	15,098	(1,178)	21,149	44,659
Comprehensive income	40,978	2,788	25,636	27,754
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	0	(587)	0	(587)
Product cost of revenues	0	0	0	0
Total cost of revenues	0	(587)	0	(587)
Selling, general and administrative expenses	27	37	51	61
Accretion of environmental liabilities	0	0	0	0
Depreciation and amortization	0	0	0	0
(Loss) income from operations	(27)	550	(51)	526
Unrealized holding gains on available-for-sale investments	(76)	0	(222)	0
Loss on early extinguishment of debt	(6,045)		(6,045)
Gain on sale of business	0		0
Interest (expense) income	(22,614)	(22,962)	(45,273)	(43,105)
Equity in earnings of subsidiaries, net of taxes	43,167	17,413	35,530	8,642
Intercompany interest income (expense)	0	0	0	0
Income (loss) before (benefit) provision for income taxes	14,405	(4,999)	(16,061)	(33,937)
(Benefit) provision for income taxes	(11,475)	(8,965)	(20,548)	(17,032)
Net income (loss)	25,880	3,966	4,487	(16,905)
Other comprehensive income	15,098	(1,178)	21,149	44,659
Comprehensive income	40,978	2,788	25,636	27,754
Reportable Legal Entities | Guarantor Subsidiaries
Revenues:
Service revenues	474,801	456,013	918,106	884,490
Product revenues	125,859	95,648	242,509	185,236
Total revenues	600,660	551,661	1,160,615	1,069,726
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	306,960	292,343	601,105	575,307
Product cost of revenues	98,645	79,108	195,150	158,462
Total cost of revenues	405,605	371,451	796,255	733,769
Selling, general and administrative expenses	92,504	83,882	184,675	164,537
Accretion of environmental liabilities	2,181	2,313	4,236	4,603
Depreciation and amortization	51,937	50,696	103,837	99,391
(Loss) income from operations	48,433	43,319	71,612	67,426
Unrealized holding gains on available-for-sale investments	(406)	400	(1,795)	312
Loss on early extinguishment of debt	0		0
Gain on sale of business	31,722		31,722
Interest (expense) income	240	1,284	359	2,395
Equity in earnings of subsidiaries, net of taxes	(5,332)	(9,195)	(27,156)	(35,690)
Intercompany interest income (expense)	1,268	5,497	2,565	10,656
Income (loss) before (benefit) provision for income taxes	75,925	41,305	77,307	45,099
(Benefit) provision for income taxes	31,981	23,892	41,618	36,457
Net income (loss)	43,944	17,413	35,689	8,642
Other comprehensive income	15,098	(1,178)	21,149	44,659
Comprehensive income	59,042	16,235	56,838	53,301
Reportable Legal Entities | Non-Guarantor Subsidiaries
Revenues:
Service revenues	147,924	139,413	278,995	253,436
Product revenues	18,730	19,391	34,061	38,104
Total revenues	166,654	158,804	313,056	291,540
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	117,181	107,792	228,285	211,083
Product cost of revenues	11,543	14,301	23,790	27,689
Total cost of revenues	128,724	122,093	252,075	238,772
Selling, general and administrative expenses	19,763	23,144	39,789	46,949
Accretion of environmental liabilities	235	235	470	450
Depreciation and amortization	19,594	22,697	40,106	42,904
(Loss) income from operations	(1,662)	(9,365)	(19,384)	(37,535)
Unrealized holding gains on available-for-sale investments	(351)	(589)	(365)	(851)
Loss on early extinguishment of debt	0		0
Gain on sale of business	0		0
Interest (expense) income	(118)	31	(154)	83
Equity in earnings of subsidiaries, net of taxes	0	0	0	0
Intercompany interest income (expense)	(1,268)	(5,497)	(2,565)	(10,656)
Income (loss) before (benefit) provision for income taxes	(3,399)	(15,420)	(22,468)	(48,959)
(Benefit) provision for income taxes	2,710	(6,225)	4,847	(13,269)
Net income (loss)	(6,109)	(9,195)	(27,315)	(35,690)
Other comprehensive income	12,837	(597)	17,869	28,330
Comprehensive income	6,728	(9,792)	(9,446)	(7,360)
Consolidating Adjustments
Revenues:
Service revenues	(11,785)	(10,864)	(25,947)	(23,133)
Product revenues	(2,741)	(2,091)	(5,995)	(4,540)
Total revenues	(14,526)	(12,955)	(31,942)	(27,673)
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	(11,785)	(10,864)	(25,947)	(23,133)
Product cost of revenues	(2,741)	(2,091)	(5,995)	(4,540)
Total cost of revenues	(14,526)	(12,955)	(31,942)	(27,673)
Selling, general and administrative expenses	0	0	0	0
Accretion of environmental liabilities	0	0	0	0
Depreciation and amortization	0	0	0	0
(Loss) income from operations	0	0	0	0
Unrealized holding gains on available-for-sale investments	0	0	0	0
Loss on early extinguishment of debt	0		0
Gain on sale of business	0		0
Interest (expense) income	0	0	0	0
Equity in earnings of subsidiaries, net of taxes	(37,835)	(8,218)	(8,374)	27,048
Intercompany interest income (expense)	0	0	0	0
Income (loss) before (benefit) provision for income taxes	(37,835)	(8,218)	(8,374)	27,048
(Benefit) provision for income taxes	0	0	0	0
Net income (loss)	(37,835)	(8,218)	(8,374)	27,048
Other comprehensive income	(27,935)	1,775	(39,018)	(72,989)
Comprehensive income	$ (65,770)	$ (6,443)	$ (47,392)	$ (45,941)

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GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION (Condensed Consolidating Statements of Cash Flows) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Condensed consolidating statement of cash flows
Net cash (used in) from operating activities	$ 116,931	$ 120,051
Cash flows from (used in) investing activities:
Additions to property, plant and equipment	(88,742)	(123,529)
Proceeds from sales of fixed assets	2,121	2,668
Acquisitions, net of cash acquired	(9,277)	(58,989)
Proceeds on sale of businesses, net of transactional costs	46,391	0
Additions to intangible assets, including costs to obtain or renew permits	(1,239)	(973)
Purchases of available-for-sale securities	0	(598)
Proceeds from sale of investments	376	0
Intercompany	0	0
Investment in subsidiaries		0
Net cash used in investing activities	(50,370)	(181,421)
Cash flows from (used in) financing activities:
Change in uncashed checks	(8,361)	(11,022)
Proceeds from exercise of stock options	46	184
Issuance of restricted shares, net of shares remitted	(2,132)	(1,879)
Repurchases of common stock	(12,257)	(10,134)
Deferred financing costs paid	(4,727)	(2,614)
Excess tax benefit of stock-based compensation	0	2
Premiums paid on early extinguishment of debt	(4,665)	0
Principal payment on debt	(296,202)	0
Issuance of senior secured notes, net of discount	399,000	0
Issuance of senior unsecured notes, including premium	0	250,625
Intercompany	0	0
Net cash from financing activities	70,702	225,162
Effect of exchange rate change on cash	2,106	4,423
(Decrease) increase in cash and cash equivalents	139,369	168,215
Cash and cash equivalents, beginning of period	306,997	184,708
Cash and cash equivalents, end of period	446,366	352,923
Consolidating Adjustments
Condensed consolidating statement of cash flows
Net cash (used in) from operating activities	0	0
Cash flows from (used in) investing activities:
Additions to property, plant and equipment	0	0
Proceeds from sales of fixed assets	0	0
Acquisitions, net of cash acquired	0	0
Proceeds on sale of businesses, net of transactional costs	0
Additions to intangible assets, including costs to obtain or renew permits	0	0
Purchases of available-for-sale securities		0
Proceeds from sale of investments	0
Intercompany	14,343	11,827
Investment in subsidiaries		250,625
Net cash used in investing activities	14,343	262,452
Cash flows from (used in) financing activities:
Change in uncashed checks	0	0
Proceeds from exercise of stock options	0	0
Issuance of restricted shares, net of shares remitted	0	0
Repurchases of common stock	0	0
Deferred financing costs paid	0	0
Excess tax benefit of stock-based compensation		0
Premiums paid on early extinguishment of debt	0
Principal payment on debt	0
Issuance of senior secured notes, net of discount	0
Issuance of senior unsecured notes, including premium		(250,625)
Intercompany	(14,343)	(11,827)
Net cash from financing activities	(14,343)	(262,452)
Effect of exchange rate change on cash	0	0
(Decrease) increase 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 (used in) from operating activities	(93,808)	42,990
Cash flows from (used in) investing activities:
Additions to property, plant and equipment	0	0
Proceeds from sales of fixed assets	0	0
Acquisitions, net of cash acquired	0	0
Proceeds on sale of businesses, net of transactional costs	0
Additions to intangible assets, including costs to obtain or renew permits	0	0
Purchases of available-for-sale securities		(102)
Proceeds from sale of investments	376
Intercompany	0	0
Investment in subsidiaries		(250,625)
Net cash used in investing activities	376	(250,727)
Cash flows from (used in) financing activities:
Change in uncashed checks	0	0
Proceeds from exercise of stock options	46	184
Issuance of restricted shares, net of shares remitted	(2,132)	(1,879)
Repurchases of common stock	(12,257)	(10,134)
Deferred financing costs paid	(4,727)	(2,614)
Excess tax benefit of stock-based compensation		2
Premiums paid on early extinguishment of debt	(4,665)
Principal payment on debt	(296,202)
Issuance of senior secured notes, net of discount	399,000
Issuance of senior unsecured notes, including premium		250,625
Intercompany	14,343	11,827
Net cash from financing activities	93,406	248,011
Effect of exchange rate change on cash	0	0
(Decrease) increase in cash and cash equivalents	(26)	40,274
Cash and cash equivalents, beginning of period	51,417	11,017
Cash and cash equivalents, end of period	51,391	51,291
Guarantor Subsidiaries | Reportable Legal Entities
Condensed consolidating statement of cash flows
Net cash (used in) from operating activities	206,496	65,860
Cash flows from (used in) investing activities:
Additions to property, plant and equipment	(75,152)	(105,175)
Proceeds from sales of fixed assets	984	694
Acquisitions, net of cash acquired	(9,277)	(48,989)
Proceeds on sale of businesses, net of transactional costs	46,210
Additions to intangible assets, including costs to obtain or renew permits	(888)	(908)
Purchases of available-for-sale securities		0
Proceeds from sale of investments	0
Intercompany	(14,343)	(11,827)
Investment in subsidiaries		0
Net cash used in investing activities	(52,466)	(166,205)
Cash flows from (used in) financing activities:
Change in uncashed checks	(5,977)	(9,266)
Proceeds from exercise of stock options	0	0
Issuance of restricted shares, net of shares remitted	0	0
Repurchases of common stock	0	0
Deferred financing costs paid	0	0
Excess tax benefit of stock-based compensation		0
Premiums paid on early extinguishment of debt	0
Principal payment on debt	0
Issuance of senior secured notes, net of discount	0
Issuance of senior unsecured notes, including premium		250,625
Intercompany	0	0
Net cash from financing activities	(5,977)	241,359
Effect of exchange rate change on cash	0	0
(Decrease) increase in cash and cash equivalents	148,053	141,014
Cash and cash equivalents, beginning of period	155,943	83,479
Cash and cash equivalents, end of period	303,996	224,493
Non-Guarantor Subsidiaries | Reportable Legal Entities
Condensed consolidating statement of cash flows
Net cash (used in) from operating activities	4,243	11,201
Cash flows from (used in) investing activities:
Additions to property, plant and equipment	(13,590)	(18,354)
Proceeds from sales of fixed assets	1,137	1,974
Acquisitions, net of cash acquired	0	(10,000)
Proceeds on sale of businesses, net of transactional costs	181
Additions to intangible assets, including costs to obtain or renew permits	(351)	(65)
Purchases of available-for-sale securities		(496)
Proceeds from sale of investments	0
Intercompany	0	0
Investment in subsidiaries		0
Net cash used in investing activities	(12,623)	(26,941)
Cash flows from (used in) financing activities:
Change in uncashed checks	(2,384)	(1,756)
Proceeds from exercise of stock options	0	0
Issuance of restricted shares, net of shares remitted	0	0
Repurchases of common stock	0	0
Deferred financing costs paid	0	0
Excess tax benefit of stock-based compensation		0
Premiums paid on early extinguishment of debt	0
Principal payment on debt	0
Issuance of senior secured notes, net of discount	0
Issuance of senior unsecured notes, including premium		0
Intercompany	0	0
Net cash from financing activities	(2,384)	(1,756)
Effect of exchange rate change on cash	2,106	4,423
(Decrease) increase in cash and cash equivalents	(8,658)	(13,073)
Cash and cash equivalents, beginning of period	99,637	90,212
Cash and cash equivalents, end of period	$ 90,979	$ 77,139

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SUBSEQUENT EVENTS (Details) - Jul. 14, 2017 - Subsequent event - Lonestar CAD / shares in Millions, CAD in Millions, $ in Millions	USD ($)	CAD	CAD CAD / shares
Business Acquisition [Line Items]
Cash paid to acquire Lonestar	$ 34.0	CAD 43.0
Equity payout (in CAD per share)			CAD 0.0
Debt outstanding assumed	$ 17.4		CAD 22.0