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 MARCH 31, 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	57,209,487
(Class)	(Outstanding as of April 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 (Loss) 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	25
ITEM 3: Quantitative and Qualitative Disclosures About Market Risk	36
ITEM 4: Controls and Procedures	36
PART II: OTHER INFORMATION
ITEM 1: Legal Proceedings	37
ITEM 1A: Risk Factors	37
ITEM 2: Unregistered Sales of Equity Securities and Use of Proceeds	37
ITEM 3: Defaults Upon Senior Securities	37
ITEM 4: Mine Safety Disclosures	37
ITEM 5: Other Information	37
ITEM 6: Exhibits	38
Signatures	39

CLEAN HARBORS, INC. AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS

(in thousands)

	March 31, 2017			December 31, 2016
ASSETS	(unaudited)
Current assets:
Cash and cash equivalents	$	297,366		$	306,997
Accounts receivable, net of allowances aggregating $27,144 and $29,249, respectively	480,044			496,226
Unbilled accounts receivable	28,106			36,190
Deferred costs	19,037			18,914
Inventories and supplies	182,038			178,428
Prepaid expenses and other current assets	55,180			56,116
Total current assets	1,061,771			1,092,871
Property, plant and equipment, net	1,609,490			1,611,827
Other assets:
Goodwill	469,860			465,154
Permits and other intangibles, net	490,952			498,721
Other	13,580			13,347
Total other assets	974,392			977,222
Total assets	$	3,645,653		$	3,681,920
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
Accounts payable	$	218,676		$	229,534
Deferred revenue	64,379			64,397
Accrued expenses	183,957			190,721
Current portion of closure, post-closure and remedial liabilities	21,569			20,016
Total current liabilities	488,581			504,668
Other liabilities:
Closure and post-closure liabilities, less current portion of $6,019 and $6,220, respectively	54,332			52,111
Remedial liabilities, less current portion of $15,550 and $13,796, respectively	111,057			114,211
Long-term obligations	1,633,968			1,633,272
Deferred taxes, unrecognized tax benefits and other long-term liabilities	294,085			293,417
Total other liabilities	2,093,442			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 57,188,805 and 57,297,978 shares, respectively	572			573
Shares held under employee participation plan	—			(469		)
Additional paid-in capital	720,383			725,670
Accumulated other comprehensive loss	(208,275		)	(214,326		)
Accumulated earnings	550,950			572,793
Total stockholders’ equity	1,063,630			1,084,241
Total liabilities and stockholders’ equity	$	3,645,653		$	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
	March 31,
	2017			2016
Revenues:
Service revenues	$	560,214		$	530,231
Product revenues	128,727			105,852
Total revenues	688,941			636,083
Cost of revenues (exclusive of items shown separately below)
Service revenues	391,087			373,986
Product revenues	105,498			90,293
Total cost of revenues	496,585			464,279
Selling, general and administrative expenses	112,221			104,484
Accretion of environmental liabilities	2,290			2,505
Depreciation and amortization	72,412			68,902
Income (loss) from operations	5,433			(4,087		)
Other expense	(1,549		)	(350		)
Interest expense, net of interest income of $215 and $150, respectively	(22,576		)	(18,980		)
Loss before provision (benefit) for income taxes	(18,692		)	(23,417		)
Provision (benefit) for income taxes	2,701			(2,546		)
Net loss	$	(21,393	)	$	(20,871	)
Loss per share:
Basic	$	(0.37	)	$	(0.36	)
Diluted	$	(0.37	)	$	(0.36	)
Shares used to compute loss per share - Basic	57,262			57,617
Shares used to compute loss per share - Diluted	57,262			57,617

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

2

CLEAN HARBORS, INC. AND SUBSIDIARIES

UNAUDITED CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME

(in thousands)

	Three Months Ended
	March 31,
	2017			2016
Net loss	$	(21,393	)	$	(20,871	)
Other comprehensive income:
Unrealized gains on available-for-sale securities (net of taxes of $152 and $0, respectively)	82			—
Reclassification adjustment for losses on available-for-sale securities included in net loss (net of taxes of $0 and $0, respectively)	146			—
Foreign currency translation adjustments	5,823			45,837
Other comprehensive income	6,051			45,837
Comprehensive (loss) income	$	(15,342	)	$	24,966

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)

	Three Months Ended
	March 31,
	2017			2016
Cash flows from operating activities:
Net loss	$	(21,393	)	$	(20,871	)
Adjustments to reconcile net loss to net cash from operating activities:
Depreciation and amortization	72,412			68,902
Allowance for doubtful accounts	1,935			1,072
Amortization of deferred financing costs and debt discount	829			872
Accretion of environmental liabilities	2,290			2,505
Changes in environmental liability estimates	102			(95		)
Deferred income taxes	196			7
Stock-based compensation	2,271			2,093
Net tax deficiency on stock based awards	—			(345		)
Other expense	1,549			350
Environmental expenditures	(2,938		)	(3,518		)
Changes in assets and liabilities, net of acquisitions
Accounts receivable and unbilled accounts receivable	24,301			35,839
Inventories and supplies	(2,676		)	(2,882		)
Other current assets	(1,277		)	1,838
Accounts payable	(13,609		)	(36,195		)
Other current and long-term liabilities	(6,873		)	(10,283		)
Net cash from operating activities	57,119			39,289
Cash flows used in investing activities:
Additions to property, plant and equipment	(42,462		)	(75,781		)
Proceeds from sales of fixed assets	1,030			1,273
Acquisitions, net of cash acquired	(11,946		)	(34,993		)
Proceeds on sale of business	2,018			—
Additions to intangible assets, including costs to obtain or renew permits	(751		)	(512		)
Proceeds from sale of investments	243			—
Net cash used in investing activities	(51,868		)	(110,013		)
Cash flows (used in) from financing activities:
Change in uncashed checks	(7,557		)	(5,218		)
Proceeds from exercise of stock options	46			—
Issuance of restricted shares, net of shares remitted	(1,021		)	(1,425		)
Repurchases of common stock	(6,796		)	(4,998		)
Deferred financing costs paid	(108		)	(2,190		)
Issuance of senior secured notes, including premium	—			250,625
Net cash (used in) from financing activities	(15,436		)	236,794
Effect of exchange rate change on cash	554			4,567
(Decrease) increase in cash and cash equivalents	(9,631		)	170,637
Cash and cash equivalents, beginning of period	306,997			184,708
Cash and cash equivalents, end of period	$	297,366		$	355,345
Supplemental information:
Cash payments for interest and income taxes:
Interest paid	$	21,717		$	21,808
Income taxes paid	5,519			5,848
Non-cash investing and financing activities:
Property, plant and equipment accrued	19,270			14,947
Receivable for estimated purchase price adjustment	1,972			250

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 loss	—		—			—			—			—			(21,393		)	(21,393		)
Other comprehensive income	—		—			—			—			6,051			—			6,051
Stock-based compensation	—		—			—			2,271			—			—			2,271
Issuance of restricted shares, net of shares remitted	34		—			—			(1,021		)	—			—			(1,021		)
Shares held under employee participation plan	(25	)	—			469			(469		)	—			—			—
Repurchases of common stock	(120	)	(1		)	—			(6,795		)	—			—			(6,796		)
Exercise of stock options	2		—			—			46			—			—			46
Balance at March 31, 2017	57,189		$	572		$	—		$	720,383		$	(208,275	)	$	550,950		$	1,063,630

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 months ended March 31, 2016 have been recast to reflect the impact of such changes. These reclassifications and adjustments had no effect on consolidated net loss, comprehensive (loss) income, cash flows or 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 March 31, 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

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, processes, and system requirements. The Company has assigned internal resources to assist in this implementation project and believes that the project is progressing timely. A final decision regarding the adoption method has not been finalized at this time. The Company’s final determination will depend on a number of factors, such as the significance of the impact of the new standard on its financial results, system readiness, and its ability to accumulate and analyze the information necessary to assess the impact on prior period financial statements, as necessary.

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.

(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.

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 provide the Company with greater access to customers in the West Coast region of the United States and additional locations with Part B permits. Operations of these acquisitions are primarily being integrated into the Safety-Kleen operating segment with certain operations also being integrated into the Technical Services and Industrial Services operating segments.

7

The combined purchase price for the seven acquisitions was approximately $205.0 million in cash, net of cash acquired, and subject to customary post-closing adjustments. The purchase price allocation for acquisitions may reflect various fair value estimates and analysis, including preliminary work performed by third-party valuation specialists. In addition, purchase prices for acquisitions may reflect preliminary working capital based adjustments. These estimates are subject to change within the measurement period as valuations and working capital adjustments are finalized. The primary areas of the preliminary purchase price allocation that are subject to change relate to the fair values of certain tangible assets and liabilities acquired, the valuation of intangible assets acquired, certain legal matters, income and income based taxes, and residual goodwill. Measurement period adjustments are recorded in the reporting period in which the estimates are finalized and adjustment amounts are determined.

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

	At Acquisition Dates As Reported December 31, 2016			Measurement Period Adjustments			At Acquisition Dates As Reported March 31, 2017
Accounts receivable	$	15,767		$	629		$	16,396
Inventories and supplies	12,515			173			12,688
Prepaid expenses and other current assets	777			(25		)	752
Property, plant and equipment	143,025			625			143,650
Permits and other intangibles	28,856			—			28,856
Current liabilities	(20,258		)	392			(19,866		)
Closure and post-closure liabilities	(2,408		)	(596		)	(3,004		)
Remedial liabilities, less current portion	(2,041		)	16			(2,025		)
Deferred taxes, unrecognized tax benefits and other long-term liabilities	(17,019		)	(456		)	(17,475		)
Total identifiable net assets	159,214			758			159,972
Goodwill	45,791			(731		)	45,060
Total purchase price, net of cash acquired	$	205,005		$	27		$	205,032

The excess of the total purchase price, which includes the aggregate cash consideration paid in excess of the fair value of the tangible net assets and intangible asset acquired, was recorded as goodwill. The goodwill recognized is attributable to the expected operating synergies and growth potential that the Company expects to realize from these acquisitions. Goodwill generated from the acquisitions was not deductible for tax purposes.

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

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 loss before benefit for income taxes attributable to the Catalyst Services business included in the Company's consolidated results of operations for three months ended March 31, 2016 (in thousands):

	Three Months Ended
	March 31, 2016
Loss before benefit for income taxes	1,099

8

(5) INVENTORIES AND SUPPLIES

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

	March 31, 2017		December 31, 2016
Oil and oil products	$	55,872	$	52,158
Supplies and drums	91,210		90,610
Solvent and solutions	8,865		8,566
Modular camp accommodations	14,859		15,255
Other	11,232		11,839
Total inventories and supplies	$	182,038	$	178,428

As of March 31, 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.

(6) PROPERTY, PLANT AND EQUIPMENT

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

	March 31, 2017		December 31, 2016
Land	$	122,184	$	120,575
Asset retirement costs (non-landfill)	15,173		14,567
Landfill assets	140,518		139,708
Buildings and improvements	406,562		373,160
Camp equipment	151,561		152,740
Vehicles	558,175		541,022
Equipment	1,591,511		1,483,736
Furniture and fixtures	5,507		5,492
Construction in progress	42,305		146,904
	3,033,496		2,977,904
Less - accumulated depreciation and amortization	1,424,006		1,366,077
Total property, plant and equipment, net	$	1,609,490	$	1,611,827

Interest in the amount of $0.1 million and $1.2 million was capitalized to fixed assets during the three months ended March 31, 2017 and March 31, 2016, respectively. Depreciation expense, inclusive of landfill amortization, was $63.3 million and $59.3 million for the three months ended March 31, 2017 and March 31, 2016, respectively.

(7) GOODWILL AND OTHER INTANGIBLE ASSETS

The changes in goodwill for the three months ended March 31, 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	—		—		4,938			—		4,938
Measurement period adjustments from prior period acquisitions	—		—		(731		)	—		(731		)
Foreign currency translation and other	42		163		294			—		499
Balance at March 31, 2017	$	61,158	$	108,131	$	300,571		$	—	$	469,860

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.

9

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

	March 31, 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	$	172,666	$	69,151	$	103,515	19.8	$	171,637	$	67,301	$	104,336	18.9
Customer and supplier relationships	394,086		134,599		259,487		11.9	393,426		127,462		265,964		12.2
Other intangible assets	34,463		29,228		5,235		7.1	34,254		28,456		5,798		7.1
Total amortizable permits and other intangible assets	601,215		232,978		368,237		14.9	599,317		223,219		376,098		13.9
Trademarks and trade names	122,715		—		122,715		Indefinite	122,623		—		122,623		Indefinite
Total permits and other intangible assets	$	723,930	$	232,978	$	490,952		$	721,940	$	223,219	$	498,721

Amortization expense of permits and other intangible assets was $9.1 million and $9.6 million for the three months ended March 31, 2017 and March 31, 2016, respectively.

The expected amortization of the net carrying amount of finite-lived intangible assets at March 31, 2017 was as follows (in thousands):

Years Ending December 31,	Expected Amortization
2017 (nine months)	$	27,392
2018	34,072
2019	31,275
2020	29,067
2021	26,640
Thereafter	219,791
	$	368,237

(8) ACCRUED EXPENSES

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

	March 31, 2017		December 31, 2016
Insurance	$	56,603	$	63,061
Interest	21,770		21,536
Accrued compensation and benefits	41,109		34,641
Income, real estate, sales and other taxes	29,814		35,083
Other	34,661		36,400
	$	183,957	$	190,721

As of March 31, 2017 and December 31, 2016, other accrued expenses included accrued legal matters of $4.2 million and $3.8 million, respectively, and accrued severance charges of $2.3 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 March 31, 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	431			—			431
Accretion	534			623			1,157
Changes in estimates recorded to statement of operations	—			(6		)	(6		)
Expenditures	(119		)	(73		)	(192		)
Currency translation and other	20			14			34
Balance at March 31, 2017	$	31,496		$	28,855		$	60,351

All of the landfill facilities included in the above were active as of March 31, 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 three months of 2017 were discounted at the credit-adjusted risk-free rate of 6.12%.

(10) REMEDIAL LIABILITIES

The changes to remedial liabilities for the three months ended March 31, 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	—			—			(16		)	(16		)
Accretion	21			615			497			1,133
Changes in estimates recorded to statement of operations	(38		)	(94		)	240			108
Expenditures	(7		)	(720		)	(2,019		)	(2,746		)
Currency translation and other	—			8			113			121
Balance at March 31, 2017	$	1,753		$	63,960		$	60,894		$	126,607

In the three months ended March 31, 2017, there were no significant charges (benefits) resulting from changes in estimates for remedial liabilities.

(11) FINANCING ARRANGEMENTS

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

	March 31, 2017			December 31, 2016
Senior unsecured notes, at 5.25%, due August 1, 2020 ("2020 Notes")	$	800,000		$	800,000
Senior unsecured notes, at 5.125%, due June 1, 2021 ("2021 Notes")	845,000			845,000
Long-term obligations, at par	$	1,645,000		$	1,645,000
Unamortized debt issuance costs and premium, net	(11,032		)	(11,728		)
Long-term obligations, at carrying value	$	1,633,968		$	1,633,272

At March 31, 2017 and December 31, 2016, the fair value of the Company's 2020 Notes was $814.0 million and $820.0 million, respectively, based on quoted market prices for the instrument. At both March 31, 2017 and December 31, 2016, the fair value of the Company's 2021 Notes was $861.9 million based on quoted market prices for the instrument. The fair value of the 2020 Notes and 2021 Notes are considered a Level 2 measure according to the fair value hierarchy.

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The Company also maintains a revolving credit facility which as of March 31, 2017 and December 31, 2016, had no outstanding loan balances. At March 31, 2017, approximately $194.0 million was available to borrow and outstanding letters of credit were $126.0 million. At December 31, 2016, $195.2 million was available to borrow and outstanding letters of credit were $132.6 million.        

(12) LOSS PER SHARE

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

	Three Months Ended
	March 31,
	2017			2016
Numerator for basic and diluted loss per share:
Net loss	$	(21,393	)	$	(20,871	)
Denominator:
Basic shares outstanding	57,262			57,617
Dilutive effect of equity-based compensation awards	—			—
Dilutive shares outstanding	57,262			57,617
Basic loss per share:	$	(0.37	)	$	(0.36	)
Diluted loss per share:	$	(0.37	)	$	(0.36	)

As a result of the net loss reported for the three months ended March 31, 2017 and 2016, all then outstanding restricted stock awards and performance awards totaling 659,558 and 474,318, respectively, were excluded from the calculation of diluted 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 three months ended March 31, 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	5,823			234			—			6,057
Amounts reclassified out of accumulated other comprehensive loss	—			146			—			146
Tax effects	—			(152		)	—			(152		)
Other comprehensive income	$	5,823		$	228		$	—		$	6,051
Balance at March 31, 2017	$	(206,388	)	$	(93	)	$	(1,794	)	$	(208,275	)

There were no reclassifications out of accumulated other comprehensive loss during the three months ended March 31, 2016.

(14) STOCK-BASED COMPENSATION

Total stock-based compensation cost charged to selling, general and administrative expenses for the three months ended March 31, 2017 and March 31, 2016 was $2.3 million and $2.1 million, respectively. The total income tax benefit recognized in the consolidated statements of operations from stock-based compensation was $0.8 million and $0.5 million for the three months ended March 31, 2017 and March 31, 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

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generally lapse upon the achievement of continued employment over a three-to-five-year period or service as a director until the following annual meeting of shareholders. The fair value of each restricted stock grant is based on the closing price of the Company's common stock on the date of grant and is amortized to expense over its vesting period.

The following table summarizes information about restricted stock awards for the three months ended March 31, 2017:

Restricted Stock	Number of Shares		Weighted Average Grant-Date Fair Value
Balance at January 1, 2017	510,041		$	52.65
Granted	22,794		$	55.64
Vested	(26,963	)	$	54.45
Forfeited	(29,218	)	$	50.97
Balance at March 31, 2017	476,654		$	52.80

As of March 31, 2017, there was $18.5 million of total unrecognized compensation cost arising from restricted stock awards under the Company's Plans. This cost is expected to be recognized over a weighted average period of 3.0 years. The total fair value of restricted stock vested during the three months ended March 31, 2017 and March 31, 2016 was $1.5 million and $3.8 million, respectively.

Performance Stock Awards

The following information relates to performance stock awards that have been granted to employees under the Company's Plans. Performance stock awards are subject to performance criteria established by the compensation committee of the Company's board of directors prior to or at the date of grant. The vesting of the performance stock awards is based on achieving such targets typically based on revenue, Adjusted EBITDA margin, return on invested capital percentage and Total Recordable Incident Rate. In addition, performance stock awards include continued service conditions. The fair value of each performance stock award is based on the closing price of the Company's common stock on the date of grant and is amortized to expense over the service period if achievement of performance measures is considered probable.

The following table summarizes information about performance stock awards for the three months ended March 31, 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	(13,398	)	$	56.26
Balance at March 31, 2017	182,904		$	54.69

As of March 31, 2017, there was $1.0 million of total unrecognized compensation cost arising from unvested performance stock awards deemed probable of vesting under the Company's Plans. The total fair value of performance awards vested during the three months ended March 31, 2017 and March 31, 2016 was $1.4 million and $0.4 million, respectively.

Common Stock Repurchases

On March 13, 2015, the Company's board of directors authorized the repurchase of up to $300 million of the Company's common stock. During the three months ended March 31, 2017, the Company repurchased and retired a total of 0.1 million shares of the Company's common stock for a total cost of $6.8 million. Through March 31, 2017, the Company has repurchased and retired a total of 4.0 million shares of the Company's common stock for a total cost of $206.7 million under this program. As of March 31, 2017, an additional $93.3 million remains available for repurchase of shares under the current authorized program.

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(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 March 31, 2017 and December 31, 2016, the Company had recorded reserves of $21.9 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 March 31, 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 $1.7 million and $1.9 million more, respectively. The Company periodically adjusts the aggregate amount of these reserves when actual or probable liabilities are paid or otherwise discharged, new claims arise, or additional relevant information about existing or probable claims becomes available. As of March 31, 2017 and December 31, 2016, the $21.9 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) $4.2 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 March 31, 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 March 31, 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 58 proceedings (excluding cases which have been settled but not formally dismissed) as of March 31, 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

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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 March 31, 2017. From January 1, 2017 to March 31, 2017, 9 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 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.

15

Federal, State and Provincial Enforcement Actions

From time to time, the Company pays fines or penalties in regulatory proceedings relating primarily to waste treatment, storage or disposal facilities. As of March 31, 2017 and December 31, 2016, there were four and five proceedings, respectively, 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 months ended March 31, 2017 was (14.5)% compared to 10.9% for the same periods in 2016. The variations in the effective income tax rates for the three months ended March 31, 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.

As of both March 31, 2017 and December 31, 2016, the Company had recorded $1.7 million of liabilities for unrecognized tax benefits and $0.3 million of interest.

Due to expiring statute of limitation periods, the Company believes that total unrecognized tax benefits will decrease by $0.5 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. 

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The following table reconciles third party revenues to direct revenues for the three months ended March 31, 2017 and 2016 (in thousands):

	For the Three Months Ended March 31, 2017											For the Three Months Ended March 31, 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	$	230,218	$	40,044		$	722		$	270,984		$	219,105	$	34,844		$	388		$	254,337
Industrial and Field Services	133,557		(8,359		)	104			125,302			130,187		(6,675		)	(13		)	123,499
Safety-Kleen	292,901		(32,069		)	3			260,835			246,961		(28,521		)	366			218,806
Oil, Gas and Lodging Services	32,132		384			94			32,610			39,051		352			104			39,507
Corporate Items	133		—			(923		)	(790		)	779		—			(845		)	(66		)
Total	$	688,941	$	—		$	—		$	688,941		$	636,083	$	—		$	—		$	636,083

The primary financial measure by which the Company evaluates the performance of its segments is Adjusted EBITDA which consists of net loss plus accretion of environmental liabilities, depreciation and amortization, net interest expense, provision (benefit) for income taxes and excludes other expense, net. 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
	March 31,
	2017			2016
Adjusted EBITDA:
Technical Services	$	58,488		$	60,398
Industrial and Field Services	1,913			433
Safety-Kleen	52,368			40,055
Oil, Gas and Lodging Services	(211		)	1,310
Corporate Items	(32,423		)	(34,876		)
Total	$	80,135		$	67,320
Reconciliation to Consolidated Statements of Operations:
Accretion of environmental liabilities	2,290			2,505
Depreciation and amortization	72,412			68,902
Income (loss) from operations	5,433			(4,087		)
Other expense	1,549			350
Interest expense, net of interest income	22,576			18,980
Loss before provision (benefit) for income taxes	$	(18,692	)	$	(23,417	)

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

	March 31, 2017
	Technical Services		Industrial and Field Services		Safety-Kleen		Oil, Gas and Lodging Services		Corporate Items		Totals
Property, plant and equipment, net	$	521,726	$	245,250	$	589,782	$	173,347	$	79,385	$	1,609,490
Goodwill	61,158		108,131		300,571		—		—		469,860
Permits and other intangibles, net	77,131		17,973		386,125		9,723		—		490,952
Total assets	$	856,324	$	446,757	$	1,477,851	$	246,910	$	617,811	$	3,645,653

	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):

	March 31, 2017		December 31, 2016
United States	$	2,947,064	$	2,960,337
Canada	698,589		721,583
Total	$	3,645,653	$	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”).

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Following is the condensed consolidating balance sheet at March 31, 2017 (in thousands):

	Clean Harbors, Inc.		Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Consolidating Adjustments			Total
Assets:
Cash and cash equivalents	$	51,726	$	139,160	$	106,480	$	—		$	297,366
Intercompany receivables	209,410		396,286		40,235		(645,931		)	—
Accounts receivable, net	—		400,764		79,280		—			480,044
Other current assets	1,033		235,715		59,592		(11,979		)	284,361
Property, plant and equipment, net	—		1,214,176		395,314		—			1,609,490
Investments in subsidiaries	2,849,584		563,331		—		(3,412,915		)	—
Intercompany debt receivable	—		87,215		24,701		(111,916		)	—
Goodwill	—		417,224		52,636		—			469,860
Permits and other intangibles, net	—		429,311		61,641		—			490,952
Other long-term assets	2,421		7,661		4,566		(1,068		)	13,580
Total assets	$	3,114,174	$	3,890,843	$	824,445	$	(4,183,809	)	$	3,645,653
Liabilities and Stockholders’ Equity:
Current liabilities	$	22,063	$	356,914	$	121,583	$	(11,979	)	$	488,581
Intercompany payables	390,812		245,871		9,248		(645,931		)	—
Closure, post-closure and remedial liabilities, net	—		148,992		16,397		—			165,389
Long-term obligations	1,633,968		—		—		—			1,633,968
Intercompany debt payable	3,701		21,000		87,215		(111,916		)	—
Other long-term liabilities	—		276,118		19,035		(1,068		)	294,085
Total liabilities	2,050,544		1,048,895		253,478		(770,894		)	2,582,023
Stockholders’ equity	1,063,630		2,841,948		570,967		(3,412,915		)	1,063,630
Total liabilities and stockholders’ equity	$	3,114,174	$	3,890,843	$	824,445	$	(4,183,809	)	$	3,645,653

19

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

20

Following is the consolidating statement of operations for the three months ended March 31, 2017 (in thousands):

	Clean Harbors, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues
Service revenues	$	—		$	443,305		$	131,071		$	(14,162	)	$	560,214
Product revenues	—			116,650			15,331			(3,254		)	128,727
Total revenues	—			559,955			146,402			(17,416		)	688,941
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	—			294,145			111,104			(14,162		)	391,087
Product cost of revenues	—			96,505			12,247			(3,254		)	105,498
Total cost of revenues	—			390,650			123,351			(17,416		)	496,585
Selling, general and administrative expenses	24			92,171			20,026			—			112,221
Accretion of environmental liabilities	—			2,055			235			—			2,290
Depreciation and amortization	—			51,900			20,512			—			72,412
(Loss) income from operations	(24		)	23,179			(17,722		)	—			5,433
Other expense	(146		)	(1,389		)	(14		)	—			(1,549		)
Interest (expense) income	(22,659		)	119			(36		)	—			(22,576		)
Equity in earnings of subsidiaries, net of taxes	(7,637		)	(21,824		)	—			29,461			—
Intercompany interest income (expense)	—			1,297			(1,297		)	—			—
(Loss) income before (benefit) provision for income taxes	(30,466		)	1,382			(19,069		)	29,461			(18,692		)
(Benefit) provision for income taxes	(9,073		)	9,637			2,137			—			2,701
Net loss	(21,393		)	(8,255		)	(21,206		)	29,461			(21,393		)
Other comprehensive income	6,051			6,051			5,032			(11,083		)	6,051
Comprehensive loss	$	(15,342	)	$	(2,204	)	$	(16,174	)	$	18,378		$	(15,342	)

21

Following is the consolidating statement of operations for the three months ended March 31, 2016 (in thousands):

	Clean Harbors, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues
Service revenues	$	—		$	428,477		$	114,023		$	(12,269	)	$	530,231
Product revenues	—			89,588			18,713			(2,449		)	105,852
Total revenues	—			518,065			132,736			(14,718		)	636,083
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	—			282,964			103,291			(12,269		)	373,986
Product cost of revenues	—			79,354			13,388			(2,449		)	90,293
Total cost of revenues	—			362,318			116,679			(14,718		)	464,279
Selling, general and administrative expenses	24			80,655			23,805			—			104,484
Accretion of environmental liabilities	—			2,290			215			—			2,505
Depreciation and amortization	—			48,695			20,207			—			68,902
(Loss) income from operations	(24		)	24,107			(28,170		)	—			(4,087		)
Other expense	—			(88		)	(262		)	—			(350		)
Interest (expense) income	(20,143		)	1,111			52			—			(18,980		)
Equity in earnings of subsidiaries, net of taxes	(8,771		)	(26,495		)	—			35,266			—
Intercompany interest income (expense)	—			5,159			(5,159		)	—			—
(Loss) income before (benefit) provision for income taxes	(28,938		)	3,794			(33,539		)	35,266			(23,417		)
(Benefit) provision for income taxes	(8,067		)	12,565			(7,044		)	—			(2,546		)
Net loss	(20,871		)	(8,771		)	(26,495		)	35,266			(20,871		)
Other comprehensive income	45,837			45,837			28,927			(74,764		)	45,837
Comprehensive income	$	24,966		$	37,066		$	2,432		$	(39,498	)	$	24,966

22

Following is the condensed consolidating statement of cash flows for the three months ended March 31, 2017 (in thousands):

	Clean Harbors, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Net cash (used in) from operating activities	$	(1,663	)	$	41,144		$	17,638		$	—		$	57,119
Cash flows from (used in) investing activities:
Additions to property, plant and equipment	—			(33,136		)	(9,326		)	—			(42,462		)
Proceeds from sales of fixed assets	—			664			366			—			1,030
Acquisitions, net of cash acquired	—			(11,946		)	—			—			(11,946		)
Proceeds on sale of business	1,837			—			181			—			2,018
Costs to obtain or renew permits	—			(573		)	(178		)	—			(751		)
Proceeds from sale of investments	243			—			—			—			243
Intercompany	—			(7,771		)	—			7,771			—
Net cash from (used in) investing activities	2,080			(52,762		)	(8,957		)	7,771			(51,868		)
Cash flows used in financing activities:
Change in uncashed checks	—			(5,165		)	(2,392		)	—			(7,557		)
Proceeds from exercise of stock options	46			—			—			—			46
Issuance of restricted shares, net of shares remitted	(1,021		)	—			—			—			(1,021		)
Repurchases of common stock	(6,796		)	—			—			—			(6,796		)
Deferred financing costs paid	(108		)	—			—			—			(108		)
Intercompany	7,771			—			—			(7,771		)	—
Net cash used in financing activities	(108		)	(5,165		)	(2,392		)	(7,771		)	(15,436		)
Effect of exchange rate change on cash	—			—			554			—			554
Increase (decrease) in cash and cash equivalents	309			(16,783		)	6,843			—			(9,631		)
Cash and cash equivalents, beginning of period	51,417			155,943			99,637			—			306,997
Cash and cash equivalents, end of period	$	51,726		$	139,160		$	106,480		$	—		$	297,366

23

Following is the condensed consolidating statement of cash flows for the three months ended March 31, 2016 (in thousands):

	Clean Harbors, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Net cash from (used in) operating activities	$	47,201		$	(3,361	)	$	(4,551	)	$	—		$	39,289
Cash flows used in investing activities:
Additions to property, plant and equipment	—			(64,754		)	(11,027		)	—			(75,781		)
Proceeds from sales of fixed assets	—			277			996			—			1,273
Acquisitions, net of cash acquired	—			(34,993		)	—			—			(34,993		)
Costs to obtain or renew permits	—			(465		)	(47		)	—			(512		)
Intercompany	—			(6,423		)	—			6,423			—
Investment in subsidiaries	(250,625		)	—			—			250,625			—
Net cash used in investing activities	(250,625		)	(106,358		)	(10,078		)	257,048			(110,013		)
Cash flows from (used in) financing activities:
Change in uncashed checks	—			(4,529		)	(689		)	—			(5,218		)
Issuance of restricted shares, net of shares remitted	(1,425		)	—			—			—			(1,425		)
Repurchases of common stock	(4,998		)	—			—			—			(4,998		)
Deferred financing costs paid	(2,190		)	—			—			—			(2,190		)
Issuance of senior secured notes, including premium	250,625			250,625			—			(250,625		)	250,625
Intercompany	6,423			—			—			(6,423		)	—
Net cash from (used in) financing activities	248,435			246,096			(689		)	(257,048		)	236,794
Effect of exchange rate change on cash	—			—			4,567			—			4,567
Increase (decrease) in cash and cash equivalents	45,011			136,377			(10,751		)	—			170,637
Cash and cash equivalents, beginning of period	11,017			83,479			90,212			—			184,708
Cash and cash equivalents, end of period	$	56,028		$	219,856		$	79,461		$	—		$	355,345

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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, treatment facilities and 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.

25

• 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 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 three months ended March 31, 2017, crude oil prices averaged $51.77. This oil price volatility and future price uncertainty 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 months ended March 31, 2017 were $688.9 million compared with $636.1 million in the three months ended March 31, 2016. Revenue growth was realized in our Technical Services, Industrial and Field Services and Safety-Kleen segments. Our Safety-Kleen segment increased direct revenues 19.2% in the three months ended March 31, 2017 from the comparable period 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 the Safety-Kleen Environmental related services and recent success from the implementation of our OilPlus closed loop initiative. Technical Services segment increased direct revenues 6.5% in the three months ended March 31, 2017 from the comparable period in 2016 primarily related to increased revenues associated with higher waste volumes disposed of in our incinerators, including our new hazardous waste incinerator at our El Dorado, Arkansas site.

We reported income from operations for the three months ended March 31, 2017 of $5.4 million compared with a loss from operations of $4.1 million in the comparable period in 2016. We reported a net loss for the three months ended March 31, 2017 and March 31, 2016 of $21.4 million and $20.9 million, respectively. Adjusted EBITDA, which is the primary financial measure by which our segments are evaluated, increased19.0% to $80.1 million from $67.3 million in the three months ended March 31, 2016. Additional information, including a reconciliation of Adjusted EBITDA to net loss, appears below under the heading "Adjusted EBITDA."

26

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 months ended March 31, 2017 and 2016 (in thousands).

	Summary of Operations (in thousands)
	For the Three Months Ended
	March 31, 2017			March 31, 2016			$ Change			% Change
Direct Revenues(1):
Technical Services	$	270,984		$	254,337		$	16,647		6.5%
Industrial and Field Services	125,302			123,499			1,803			1.5
Safety-Kleen	260,835			218,806			42,029			19.2
Oil, Gas and Lodging Services	32,610			39,507			(6,897		)	(17.5)
Corporate Items	(790		)	(66		)	(724		)	(1,097.0)
Total	688,941			636,083			52,858			8.3
Cost of Revenues(2):
Technical Services	191,122			174,046			17,076			9.8
Industrial and Field Services	107,486			107,292			194			0.2
Safety-Kleen	171,748			147,429			24,319			16.5
Oil, Gas and Lodging Services	29,253			34,155			(4,902		)	(14.4)
Corporate Items	(3,024		)	1,357			(4,381		)	(322.8)
Total	496,585			464,279			32,306			7.0
Selling, General & Administrative Expenses:
Technical Services	21,374			19,893			1,481			7.4
Industrial and Field Services	15,903			15,774			129			0.8
Safety-Kleen	36,719			31,322			5,397			17.2
Oil, Gas and Lodging Services	3,568			4,042			(474		)	(11.7)
Corporate Items	34,657			33,453			1,204			3.6
Total	112,221			104,484			7,737			7.4
Adjusted EBITDA:
Technical Services	58,488			60,398			(1,910		)	(3.2)
Industrial and Field Services	1,913			433			1,480			341.8
Safety-Kleen	52,368			40,055			12,313			30.7
Oil, Gas and Lodging Services	(211		)	1,310			(1,521		)	(116.1)
Corporate Items	(32,423		)	(34,876		)	2,453			7.0
Total	$	80,135		$	67,320		$	12,815		19.0%

______________________

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.

27

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, 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
	March 31,				2017 over 2016
	2017		2016		$ Change		% Change
Direct revenues	$	270,984	$	254,337	$	16,647	6.5	%

Technical Services direct revenues for the three months ended March 31, 2017increased$16.6 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. The utilization rate at our incinerators was 79.2% on a practical capacity of 561,721 tons for the three months ended March 31, 2017, compared with 86.6% 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 approximately 70,000 tons of additional capacity to our network.

Industrial and Field Services

	For the Three Months Ended
	March 31,				2017 over 2016
	2017		2016		$ Change		% Change
Direct revenues	$	125,302	$	123,499	$	1,803	1.5	%

Industrial and Field Services direct revenues for the three months ended March 31, 2017increased$1.8 million from the comparable period in 2016 primarily due to increased revenues of $8.4 million in our field services business, which has benefited from opening new locations at existing sites used by our other operating segments. Also in the three months ended March 31, 2017, greater levels of project work at our production services business accounted for increases to direct revenue of $3.9 million from the comparable period in 2016. Included in the three months ended March 31, 2016 results is $10.7 million of direct revenues from our Catalyst Services business, which was sold on September 1, 2016.

Safety-Kleen

	For the Three Months Ended
	March 31,				2017 over 2016
	2017		2016		$ Change		% Change
Direct revenues	$	260,835	$	218,806	$	42,029	19.2	%

Safety-Kleen direct revenues for the three months ended March 31, 2017increased$42.0 million from the comparable period in 2016 primarily from recent acquisitions, more favorable pricing and growth in the business. Increased base and blended oil volumes and pricing accounted for $20.1 million of incremental direct revenue from the comparable period in 2016. Our packaging and blending business generated $10.6 million of direct revenue. Growth across our other business lines, most notably our used motor oil collection and containerized waste services businesses, accounted for $7.2 million of incremental growth from the comparable period in 2016.

28

Oil, Gas and Lodging Services

	For the Three Months Ended
	March 31,				2017 over 2016
	2017		2016		$ Change			% Change
Direct revenues	$	32,610	$	39,507	$	(6,897	)	(17.5	)%

Oil, Gas and Lodging Services direct revenues for the three months ended March 31, 2017decreased$6.9 million from the comparable period in 2016 primarily due to lower business activity resulting in lower exploration budgets of our customers, decreased manufacturing revenues, and reduced customer spending which is consistent with overall market conditions.

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 improve our operating margins.

Technical Services

	For the Three Months Ended
	March 31,						2017 over 2016
	2017			2016			$ Change		% Change
Cost of revenues	$	191,122		$	174,046		$	17,076	9.8	%
As a % of Direct Revenue	70.5		%	68.4		%			2.1	%

Technical Services cost of revenues for the three months ended March 31, 2017increased$17.1 million from the comparable period in 2016 primarily due to increases in equipment and supply costs of $5.4 million, labor related costs of $5.2 million and transportation, disposal and fuel costs of $4.5 million. These increases were related to higher activity levels experienced during the quarter, operating costs associated with the new El Dorado incinerator and continued start-up activities related to our other strategic growth initiatives. With the increased costs devoted to our strategic growth initiatives these costs increased 2.1% as a percentage of direct revenues.

Industrial and Field Services

	For the Three Months Ended
	March 31,						2017 over 2016
	2017			2016			$ Change		% Change
Cost of revenues	$	107,486		$	107,292		$	194	0.2	%
As a % of Direct Revenue	85.8		%	86.9		%			(1.1	)%

Industrial and Field Services cost of revenues for the three months ended March 31, 2017 increased $0.2 million from the comparable period in 2016. Included in the three months ended March 31, 2016 results is $10.2 million of cost of revenues from our Catalyst Services business, which was sold on September 1, 2016. Excluding those costs, Industrial and Field Services cost of revenues for the three months ended March 31, 2017 increased $10.4 million from the comparable period in 2016 primarily due to increases in labor related costs of $3.4 million, disposal and fuel costs of $2.6 million as well as an additional $4.4 million increase spread across multiple expense categories. As a percentage of direct revenues, these costs decreased 1.1% primarily as a result of greater direct revenue levels being achieved in the current period while successfully managing the costs associated with those revenues.

29

Safety-Kleen

	For the Three Months Ended
	March 31,						2017 over 2016
	2017			2016			$ Change		% Change
Cost of revenues	$	171,748		$	147,429		$	24,319	16.5	%
As a % of Direct Revenue	65.8		%	67.4		%			(1.6	)%

Safety-Kleen cost of revenues for the three months ended March 31, 2017increased$24.3 million from the comparable period in 2016 primarily due to increases in oil additives and other raw material costs of $7.8 million, labor related costs of $4.0 million, transportation and fuel costs of $3.3 million as well as an additional $9.2 million increase spread across multiple expense categories and attributable to overall growth of the business. These increases are the result of our recent acquisitions which took place primarily during the second half of 2016 and contributed to the implementation of our OilPlus close loop initiative. As a percentage of direct revenues, these costs decreased 1.6% primarily as a result of greater direct revenue levels being achieved.

Oil, Gas and Lodging Services

	For the Three Months Ended
	March 31,						2017 over 2016
	2017			2016			$ Change			% Change
Cost of revenues	$	29,253		$	34,155		$	(4,902	)	(14.4	)%
As a % of Direct Revenue	89.7		%	86.5		%				3.2	%

Oil, Gas and Lodging Services cost of revenues for the three months ended March 31, 2017decreased$4.9 million from the comparable period in 2016 primarily due to decreases in supplies and material costs of $4.2 million driven by lower direct revenues. As a percentage of direct revenues, these costs increased 3.2% as certain fixed costs incurred could not be reduced proportionate to the overall lower revenue generated combined with reduced margins resulting from pricing pressures seen in the overall business environment.

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

Selling, General and Administrative expenses represent costs incurred in aspects of our business which are not 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.

Technical Services

	For the Three Months Ended
	March 31,						2017 over 2016
	2017			2016			$ Change		% Change
SG&A	$	21,374		$	19,893		$	1,481	7.4	%
As a % of Direct Revenue	7.9		%	7.8		%			0.1	%

Technical Services selling, general and administrative expenses for the three months ended March 31, 2017increased$1.5 million from the comparable period in 2016 due to increases in labor related costs and variable compensation.

30

Industrial and Field Services

	For the Three Months Ended
	March 31,						2017 over 2016
	2017			2016			$ Change		% Change
SG&A	$	15,903		$	15,774		$	129	0.8	%
As a % of Direct Revenue	12.7		%	12.8		%			(0.1	)%

Industrial and Field Services selling, general and administrative expenses for the three months ended March 31, 2017 increased $0.1 million from the comparable period in 2016. Included in the three months ended March 31, 2016 results is $1.2 million of selling, general and administrative expenses from our Catalyst Services business, which was sold on September 1, 2016. Excluding those costs, Industrial and Field Services selling, general and administrative expenses for the three months ended March 31, 2017 increased $1.3 million from the comparable period in 2016 primarily due to increases in labor related costs and variable compensation.

Safety-Kleen

	For the Three Months Ended
	March 31,						2017 over 2016
	2017			2016			$ Change		% Change
SG&A	$	36,719		$	31,322		$	5,397	17.2	%
As a % of Direct Revenue	14.1		%	14.3		%			(0.2	)%

Safety-Kleen selling, general and administrative expenses for the three months ended March 31, 2017increased$5.4 million from the comparable period in 2016 primarily due to increases in labor related costs of $3.0 million. This increase reflects the growth in the business resulting primarily from our 2016 acquisitions.

Oil and Gas Field Services

	For the Three Months Ended
	March 31,						2017 over 2016
	2017			2016			$ Change			% Change
SG&A	$	3,568		$	4,042		$	(474	)	(11.7	)%
As a % of Direct Revenue	10.9		%	10.2		%				0.7	%

Oil, Gas and Lodging Services selling, general and administrative expenses for the three months ended March 31, 2017 remained flat from the comparable period in 2016 as management continues to focus on proper alignment of its costs structure for this business.

Corporate Items

	For the Three Months Ended
	March 31,				2017 over 2016
	2017		2016		$ Change		% Change
SG&A	$	34,657	$	33,453	$	1,204	3.6	%

Corporate Items selling, general and administrative expenses for the three months ended March 31, 2017increased$1.2 million from the comparable period in 2016 primarily due to increases to variable compensation of $2.9 million and professional fees of $0.6 million partially offset by decreases in severance costs of $2.2 million.

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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
	March 31, 2017			March 31, 2016			$ Change			% Change
Adjusted EBITDA:
Technical Services	$	58,488		$	60,398		$	(1,910	)	(3.2)%
Industrial and Field Services	1,913			433			1,480			341.8
Safety-Kleen	52,368			40,055			12,313			30.7
Oil, Gas and Lodging Services	(211		)	1,310			(1,521		)	(116.1)
Corporate Items	(32,423		)	(34,876		)	2,453			7.0
Total	$	80,135		$	67,320		$	12,815		19.0%

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 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.

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

	For the Three Months Ended
	March 31,
	2017			2016
Net loss	$	(21,393	)	$	(20,871	)
Accretion of environmental liabilities	2,290			2,505
Depreciation and amortization	72,412			68,902
Other expense	1,549			350
Interest expense, net	22,576			18,980
Provision (benefit) for income taxes	2,701			(2,546		)
Adjusted EBITDA	$	80,135		$	67,320

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Depreciation and Amortization

	For the Three Months Ended
	March 31,				2017 over 2016
	2017		2016		$ Change			% Change
Depreciation of fixed assets and landfill amortization	$	63,327	$	59,341	$	3,986		6.7	%
Permits and other intangibles amortization	9,085		9,561		(476		)	(5.0	)
Total depreciation and amortization	$	72,412	$	68,902	$	3,510		5.1	%

Depreciation and amortization increased$3.5 million for the three months ended March 31, 2017 from the comparable period in 2016 primarily due to a larger fixed asset base resulting from our recent acquisitions as well as our new El Dorado incinerator.

Provision (benefit) for Income Taxes

	For the Three Months Ended
	March 31,					2017 over 2016
	2017		2016			$ Change		% Change
Provision (benefit) for income taxes	$	2,701	$	(2,546	)	$	5,247	(206.1	)%

The income tax provision (benefit) for the three months ended March 31, 2017 increased $5.2 million as compared to the comparable period in 2016. The increase in the provision in the three months ended March 31, 2017 was primarily due to the inability to recognize benefits from pre-tax operating losses being generated by certain of our Canadian operations. The Company’s effective tax rate for the three months ended March 31, 2017 was (14.5)% compared to 10.9% for the same period in 2016. The variations in the effective income tax rates for the three months ended March 31, 2017 as compared to more customary relationships between pre-tax income and the provision for income taxes was primarily due to the impacts of not recognizing benefits from these aforementioned pre-tax losses in Canada.

Liquidity and Capital Resources

	For the Three Months Ended
(in thousands)	March 31, 2017			March 31, 2016
Net cash from operating activities	$	57,119		$	39,289
Net cash used in investing activities	(51,868		)	(110,013		)
Net cash (used in) from financing activities	(15,436		)	236,794

Net cash from operating activities

Net cash from operating activities for the three months ended March 31, 2017 was $57.1 million, an increase of $17.8 million, compared with net cash from operating activities for the comparable period in 2016. The change was primarily the result of improved management of working capital, more specifically from lower payments associated with liabilities during the three months ended March 31, 2017 from the comparable period in 2016.

Net cash used in investing activities

Net cash used in investing activities for the three months ended March 31, 2017 was $51.9 million, a decrease of $58.1 million, compared with cash used in investing activities for 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 three months ended March 31, 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 three months ended March 31, 2017 we also had a decrease in cash paid for acquisitions as compared to the three months ended March 31, 2016 and received proceeds of $2.0 million due to finalizing working capital adjustments associated with the sale of our Catalyst Services business.

Net cash (used in) from financing activities

Net cash used in financing activities for the three months ended March 31, 2017 was $15.4 million, compared with net cash from financing activities of $236.8 million for the comparable period in 2016. The change was due to the issuance of $250.0 million in aggregate principle amount of 5.125% senior notes due 2021 which we completed on March 17, 2016.

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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 and cash payments made in connection with early extinguishment of debt, less additions to property, plant and equipment plus proceeds from sales of fixed assets. Adjusted free cash flow should not be considered 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):

	For the Three Months Ended
	March 31,
	2017			2016
Net cash from operating activities	$	57,119		$	39,289
Additions to property, plant and equipment	(42,462		)	(75,781		)
Proceeds from sales of fixed assets	1,030			1,273
Adjusted free cash flow	$	15,687		$	(35,219	)

Working Capital

At March 31, 2017, cash and cash equivalents totaled $297.4 million, compared to $307.0 million at December 31, 2016. At March 31, 2017, cash and cash equivalents held by our foreign subsidiaries totaled $62.2 million and were readily convertible into other foreign currencies including U.S. dollars. At March 31, 2017, the cash and cash equivalent balance for our U.S. operations was $235.2 million, and our U.S. operations had net operating cash flow of $35.7 million for the three months ended March 31, 2017. Additionally, we have a $400.0 million revolving credit facility of which approximately $194.0 million was available to borrow at March 31, 2017. Based on the above and on our current plans, we believe that our U.S. operations have adequate financial resources to satisfy their liquidity needs without being required to repatriate earnings from foreign subsidiaries. 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.

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 $800.0 million principal amount of 5.25% senior unsecured notes due 2020 and $845.0 million principal amount of 5.125% senior unsecured notes due 2021 which were outstanding at March 31, 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 March 31, 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.

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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 months ended March 31, 2017, we repurchased and retired a total of 0.1 million shares of our common stock for a total cost of $6.8 million. Through March 31, 2017, we have repurchased and retired a total of 4.0 million shares of our common stock for a total cost of $206.7 million under this program. As of March 31, 2017, an additional $93.3 million remains available for repurchase of shares under the current authorized program.

Environmental Liabilities

(in thousands)	March 31, 2017		December 31, 2016		$ Change			% Change
Closure and post-closure liabilities	$	60,351	$	58,331	$	2,020		3.5	%
Remedial liabilities	126,607		128,007		(1,400		)	(1.1	)
Total environmental liabilities	$	186,958	$	186,338	$	620		0.3	%

Total environmental liabilities as of March 31, 2017 were $187.0 million, an increase of $0.6 million, compared to the liabilities as of December 31, 2016 primarily due to accretion of $2.3 million as well as new asset retirement obligations and measurement period adjustments associated with prior period acquisitions of $1.0 million offset by expenditures of $2.9 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 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 three 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 March 31, 2017, we have seven reporting units. Our Technical Services, Kleen Performance Products, SK Environmental Services, Lodging Services and Oil and Gas Field Services segments each constitute a reporting unit. Our Industrial and Field Services segment includes two separate reporting units: Industrial Services and Field Services.

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 values of each reporting unit significantly exceeded their carrying values. 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

35

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 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 three months ended March 31, 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 March 31, 2017.

Other Long-Lived Assets. As of March 31, 2017, the Oil and Gas Field Services reporting unit had other long-lived assets consisting of: property, plant and equipment, net of $81.9 million and intangible assets of $4.6 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 March 31, 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 three 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 March 31, 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 March 31, 2017 that have materially affected, or are reasonably likely to materially affect, the Company’s internal control over financial reporting.

36

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 three months ended March 31, 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)
January 1, 2017 through January 31, 2017	757	$	55.35	—	$	100,123,458
February 1, 2017 through February 28, 2017	11,387	$	57.31	10,000	$	99,546,396
March 1, 2017 through March 31, 2017	126,076	$	56.50	110,000	$	93,326,988
Total	138,220	$	56.56	120,000	$	93,326,988

______________________

(1) Includes 18,220 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

37

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 March 31, 2017, formatted in XBRL: (i) Consolidated Balance Sheets, (ii) Unaudited Consolidated Statements of Operations, (iii) Unaudited Consolidated Statements of Comprehensive (Loss) 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.

38

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:	May 3, 2017
		By:	/s/  MICHAEL L. BATTLES
			Michael L. Battles
			Executive Vice President and Chief Financial Officer
Date:	May 3, 2017

39

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: May 3, 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: May 3, 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 March 31, 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:	May 3, 2017
		By:	/s/  MICHAEL L. BATTLES
			Michael L. Battles
			Executive Vice President and Chief Financial Officer
Date:	May 3, 2017

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DOCUMENT AND ENTITY INFORMATION - shares	3 Months Ended
	Mar. 31, 2017	Apr. 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	Mar. 31, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Common Stock, Shares Outstanding		57,209,487

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CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 297,366	$ 306,997
Accounts receivable, net of allowances aggregating $27,144 and $29,249, respectively	480,044	496,226
Unbilled accounts receivable	28,106	36,190
Deferred costs	19,037	18,914
Inventories and supplies	182,038	178,428
Prepaid expenses and other current assets	55,180	56,116
Total current assets	1,061,771	1,092,871
Property, plant and equipment, net	1,609,490	1,611,827
Other assets:
Goodwill	469,860	465,154
Permits and other intangibles, net	490,952	498,721
Other	13,580	13,347
Total other assets	974,392	977,222
Total assets	3,645,653	3,681,920
Current liabilities:
Accounts payable	218,676	229,534
Deferred revenue	64,379	64,397
Accrued expenses	183,957	190,721
Current portion of closure, post-closure and remedial liabilities	21,569	20,016
Total current liabilities	488,581	504,668
Other liabilities:
Closure and post-closure liabilities, less current portion of $6,019 and $6,220, respectively	54,332	52,111
Remedial liabilities, less current portion of $15,550 and $13,796, respectively	111,057	114,211
Long-term obligations	1,633,968	1,633,272
Deferred taxes, unrecognized tax benefits and other long-term liabilities	294,085	293,417
Total other liabilities	2,093,442	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 57,188,805 and 57,297,978 shares, respectively	572	573
Shares held under employee participation plan	0	(469)
Additional paid-in capital	720,383	725,670
Accumulated other comprehensive loss	(208,275)	(214,326)
Accumulated earnings	550,950	572,793
Total stockholders’ equity	1,063,630	1,084,241
Total liabilities and stockholders’ equity	$ 3,645,653	$ 3,681,920

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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Account receivable, allowances aggregating	$ 27,144	$ 29,249
Closure and post-closure liabilities, current portion	6,019	6,220
Remedial liabilities, current portion	$ 15,550	$ 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)	57,188,805	57,297,978
Common stock, outstanding shares (in shares)	57,188,805	57,297,978

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UNAUDITED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Revenues:
Service revenues	$ 560,214	$ 530,231
Product revenues	128,727	105,852
Total revenues	688,941	636,083
Cost of revenues (exclusive of items shown separately below)
Service revenues	391,087	373,986
Product revenues	105,498	90,293
Total cost of revenues	496,585	464,279
Selling, general and administrative expenses	112,221	104,484
Accretion of environmental liabilities	2,290	2,505
Depreciation and amortization	72,412	68,902
(Loss) income from operations	5,433	(4,087)
Other expense	(1,549)	(350)
Interest expense, net of interest income of $215 and $150, respectively	(22,576)	(18,980)
(Loss) income before (benefit) provision for income taxes	(18,692)	(23,417)
Provision (benefit) for income taxes	2,701	(2,546)
Net loss	$ (21,393)	$ (20,871)
Loss per share:
Basic (in USD per share)	$ (0.37)	$ (0.36)
Diluted (in USD per share)	$ (0.37)	$ (0.36)
Shares used to compute loss per share - Basic (in shares)	57,262	57,617
Shares used to compute loss per share - Diluted (in shares)	57,262	57,617

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UNAUDITED CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Statement [Abstract]
Interest expense	$ 215	$ 150

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UNAUDITED CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Net loss	$ (21,393)	$ (20,871)
Other comprehensive income:
Unrealized gains on available-for-sale securities (net of taxes of $152 and $0, respectively)	82	0
Reclassification adjustment for losses on available-for-sale securities included in net loss (net of taxes of $0 and $0, respectively)	146	0
Foreign currency translation adjustments	5,823	45,837
Other comprehensive income	6,051	45,837
Comprehensive (loss) income	$ (15,342)	$ 24,966

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UNAUDITED CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Unrealized gains (losses) on available-for-sale securities, taxes	$ 152	$ 0
Reclassification adjustment for gains on available-for-sale securities included in net (loss) income taxes	$ 0	$ 0

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UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities:
Net loss	$ (21,393)	$ (20,871)
Adjustments to reconcile net loss to net cash from operating activities:
Depreciation and amortization	72,412	68,902
Allowance for doubtful accounts	1,935	1,072
Amortization of deferred financing costs and debt discount	829	872
Accretion of environmental liabilities	2,290	2,505
Changes in environmental liability estimates	102	(95)
Deferred income taxes	196	7
Stock-based compensation	2,271	2,093
Net tax deficiency on stock based awards	0	(345)
Other expense	1,549	350
Environmental expenditures	(2,938)	(3,518)
Changes in assets and liabilities, net of acquisitions
Accounts receivable and unbilled accounts receivable	24,301	35,839
Inventories and supplies	(2,676)	(2,882)
Other current assets	(1,277)	1,838
Accounts payable	(13,609)	(36,195)
Other current and long-term liabilities	(6,873)	(10,283)
Net cash from operating activities	57,119	39,289
Cash flows used in investing activities:
Additions to property, plant and equipment	(42,462)	(75,781)
Proceeds from sales of fixed assets	1,030	1,273
Acquisitions, net of cash acquired	(11,946)	(34,993)
Proceeds on sale of business	2,018	0
Additions to intangible assets, including costs to obtain or renew permits	(751)	(512)
Proceeds from sale of investments	243	0
Net cash used in investing activities	(51,868)	(110,013)
Cash flows (used in) from financing activities:
Change in uncashed checks	(7,557)	(5,218)
Proceeds from exercise of stock options	46	0
Issuance of restricted shares, net of shares remitted	(1,021)	(1,425)
Repurchases of common stock	(6,796)	(4,998)
Deferred financing costs paid	(108)	(2,190)
Issuance of senior secured notes, including premium	0	250,625
Net cash (used in) from financing activities	(15,436)	236,794
Effect of exchange rate change on cash	554	4,567
(Decrease) increase in cash and cash equivalents	(9,631)	170,637
Cash and cash equivalents, beginning of period	306,997	184,708
Cash and cash equivalents, end of period	297,366	355,345
Cash payments for interest and income taxes:
Interest paid	21,717	21,808
Income taxes paid	5,519	5,848
Non-cash investing and financing activities:
Property, plant and equipment accrued	19,270	14,947
Receivable for estimated purchase price adjustment	$ 1,972	$ 250

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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 loss	(21,393)					(21,393)
Other comprehensive income	6,051				6,051
Stock-based compensation	2,271			2,271
Issuance of restricted shares, net of shares remitted	(1,021)	$ 0		(1,021)
Issuance of restricted shares, net of shares remitted (in shares)		34
Shares held under employee participation plan	0	$ 0	469	(469)
Shares held under employee participation plan (in shares)		(25)
Repurchases of common stock	$ (6,796)	$ (1)		(6,795)
Repurchases of common stock (in shares)	(100)	(120)
Exercise of stock options	$ 46			46
Exercise of stock options (in shares)		2
Balance at end of period at Mar. 31, 2017	$ 1,063,630	$ 572	$ 0	$ 720,383	$ (208,275)	$ 550,950
Balance ending of period (in shares) at Mar. 31, 2017		57,189

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

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BASIS OF PRESENTATION

3 Months Ended

Mar. 31, 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.

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SIGNIFICANT ACCOUNTING POLICIES

3 Months Ended

Mar. 31, 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 months ended March 31, 2016 have been recast to reflect the impact of such changes. These reclassifications and adjustments had no effect on consolidated net loss, comprehensive (loss) income, cash flows or 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 March 31, 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.

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, processes, and system requirements. The Company has assigned internal resources to assist in this implementation project and believes that the project is progressing timely. A final decision regarding the adoption method has not been finalized at this time. The Company’s final determination will depend on a number of factors, such as the significance of the impact of the new standard on its financial results, system readiness, and its ability to accumulate and analyze the information necessary to assess the impact on prior period financial statements, as necessary.

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.

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BUSINESS COMBINATIONS

3 Months Ended

Mar. 31, 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 provide the Company with greater access to customers in the West Coast region of the United States and additional locations with Part B permits. Operations of these acquisitions are primarily being integrated 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 approximately $205.0 million in cash, net of cash acquired, and subject to customary post-closing adjustments. The purchase price allocation for acquisitions may reflect various fair value estimates and analysis, including preliminary work performed by third-party valuation specialists. In addition, purchase prices for acquisitions may reflect preliminary working capital based adjustments. These estimates are subject to change within the measurement period as valuations and working capital adjustments are finalized. The primary areas of the preliminary purchase price allocation that are subject to change relate to the fair values of certain tangible assets and liabilities acquired, the valuation of intangible assets acquired, certain legal matters, income and income based taxes, and residual goodwill. Measurement period adjustments are recorded in the reporting period in which the estimates are finalized and adjustment amounts are determined.

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

	At Acquisition Dates As Reported December 31, 2016			Measurement Period Adjustments			At Acquisition Dates As Reported March 31, 2017
Accounts receivable	$	15,767		$	629		$	16,396
Inventories and supplies	12,515			173			12,688
Prepaid expenses and other current assets	777			(25		)	752
Property, plant and equipment	143,025			625			143,650
Permits and other intangibles	28,856			—			28,856
Current liabilities	(20,258		)	392			(19,866		)
Closure and post-closure liabilities	(2,408		)	(596		)	(3,004		)
Remedial liabilities, less current portion	(2,041		)	16			(2,025		)
Deferred taxes, unrecognized tax benefits and other long-term liabilities	(17,019		)	(456		)	(17,475		)
Total identifiable net assets	159,214			758			159,972
Goodwill	45,791			(731		)	45,060
Total purchase price, net of cash acquired	$	205,005		$	27		$	205,032

The excess of the total purchase price, which includes the aggregate cash consideration paid in excess of the fair value of the tangible net assets and intangible asset acquired, was recorded as goodwill. The goodwill recognized is attributable to the expected operating synergies and growth potential that the Company expects to realize from these acquisitions. Goodwill generated from the acquisitions was not deductible for tax purposes.

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

3 Months Ended

Mar. 31, 2017

Discontinued Operations and Disposal Groups [Abstract]

DISPOSITION OF BUSINESS

DISPOSITION OF BUSINESS

On September 1, 2016, the Company completed the sale of its Catalyst Services business, which was a non-core business previously included within the Industrial and Field Services segment. 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 loss before benefit for income taxes attributable to the Catalyst Services business included in the Company's consolidated results of operations for three months ended March 31, 2016 (in thousands):

	Three Months Ended
	March 31, 2016
Loss before benefit for income taxes	1,099

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INVENTORIES AND SUPPLIES

3 Months Ended

Mar. 31, 2017

Inventory Disclosure [Abstract]

INVENTORIES AND SUPPLIES

INVENTORIES AND SUPPLIES

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

	March 31, 2017		December 31, 2016
Oil and oil products	$	55,872	$	52,158
Supplies and drums	91,210		90,610
Solvent and solutions	8,865		8,566
Modular camp accommodations	14,859		15,255
Other	11,232		11,839
Total inventories and supplies	$	182,038	$	178,428

As of March 31, 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.

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PROPERTY, PLANT AND EQUIPMENT

3 Months Ended

Mar. 31, 2017

Property, Plant and Equipment [Abstract]

PROPERTY, PLANT AND EQUIPMENT

PROPERTY, PLANT AND EQUIPMENT

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

	March 31, 2017		December 31, 2016
Land	$	122,184	$	120,575
Asset retirement costs (non-landfill)	15,173		14,567
Landfill assets	140,518		139,708
Buildings and improvements	406,562		373,160
Camp equipment	151,561		152,740
Vehicles	558,175		541,022
Equipment	1,591,511		1,483,736
Furniture and fixtures	5,507		5,492
Construction in progress	42,305		146,904
	3,033,496		2,977,904
Less - accumulated depreciation and amortization	1,424,006		1,366,077
Total property, plant and equipment, net	$	1,609,490	$	1,611,827

Interest in the amount of $0.1 million and $1.2 million was capitalized to fixed assets during the three months ended March 31, 2017 and March 31, 2016, respectively. Depreciation expense, inclusive of landfill amortization, was $63.3 million and $59.3 million for the three months ended March 31, 2017 and March 31, 2016, respectively.

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GOODWILL AND OTHER INTANGIBLE ASSETS

3 Months Ended

Mar. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

GOODWILL AND OTHER INTANGIBLE ASSETS

GOODWILL AND OTHER INTANGIBLE ASSETS

The changes in goodwill for the three months ended March 31, 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	—		—		4,938			—		4,938
Measurement period adjustments from prior period acquisitions	—		—		(731		)	—		(731		)
Foreign currency translation and other	42		163		294			—		499
Balance at March 31, 2017	$	61,158	$	108,131	$	300,571		$	—	$	469,860

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

	March 31, 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	$	172,666	$	69,151	$	103,515	19.8	$	171,637	$	67,301	$	104,336	18.9
Customer and supplier relationships	394,086		134,599		259,487		11.9	393,426		127,462		265,964		12.2
Other intangible assets	34,463		29,228		5,235		7.1	34,254		28,456		5,798		7.1
Total amortizable permits and other intangible assets	601,215		232,978		368,237		14.9	599,317		223,219		376,098		13.9
Trademarks and trade names	122,715		—		122,715		Indefinite	122,623		—		122,623		Indefinite
Total permits and other intangible assets	$	723,930	$	232,978	$	490,952		$	721,940	$	223,219	$	498,721

Amortization expense of permits and other intangible assets was $9.1 million and $9.6 million for the three months ended March 31, 2017 and March 31, 2016, respectively.

The expected amortization of the net carrying amount of finite-lived intangible assets at March 31, 2017 was as follows (in thousands):

Years Ending December 31,	Expected Amortization
2017 (nine months)	$	27,392
2018	34,072
2019	31,275
2020	29,067
2021	26,640
Thereafter	219,791
	$	368,237

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ACCRUED EXPENSES

3 Months Ended

Mar. 31, 2017

Payables and Accruals [Abstract]

ACCRUED EXPENSES

ACCRUED EXPENSES

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

	March 31, 2017		December 31, 2016
Insurance	$	56,603	$	63,061
Interest	21,770		21,536
Accrued compensation and benefits	41,109		34,641
Income, real estate, sales and other taxes	29,814		35,083
Other	34,661		36,400
	$	183,957	$	190,721

As of March 31, 2017 and December 31, 2016, other accrued expenses included accrued legal matters of $4.2 million and $3.8 million, respectively, and accrued severance charges of $2.3 million and $2.9 million, respectively.

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CLOSURE AND POST-CLOSURE LIABILITIES

3 Months Ended

Mar. 31, 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 March 31, 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	431			—			431
Accretion	534			623			1,157
Changes in estimates recorded to statement of operations	—			(6		)	(6		)
Expenditures	(119		)	(73		)	(192		)
Currency translation and other	20			14			34
Balance at March 31, 2017	$	31,496		$	28,855		$	60,351

All of the landfill facilities included in the above were active as of March 31, 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 three months of 2017 were discounted at the credit-adjusted risk-free rate of 6.12%.

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REMEDIAL LIABILITIES

3 Months Ended

Mar. 31, 2017

Environmental Remediation Obligations [Abstract]

REMEDIAL LIABILITIES

REMEDIAL LIABILITIES

The changes to remedial liabilities for the three months ended March 31, 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	—			—			(16		)	(16		)
Accretion	21			615			497			1,133
Changes in estimates recorded to statement of operations	(38		)	(94		)	240			108
Expenditures	(7		)	(720		)	(2,019		)	(2,746		)
Currency translation and other	—			8			113			121
Balance at March 31, 2017	$	1,753		$	63,960		$	60,894		$	126,607

In the three months ended March 31, 2017, there were no significant charges (benefits) resulting from changes in estimates for remedial liabilities.

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FINANCING ARRANGEMENTS

3 Months Ended

Mar. 31, 2017

Debt Disclosure [Abstract]

FINANCING ARRANGEMENTS

FINANCING ARRANGEMENTS

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

	March 31, 2017			December 31, 2016
Senior unsecured notes, at 5.25%, due August 1, 2020 ("2020 Notes")	$	800,000		$	800,000
Senior unsecured notes, at 5.125%, due June 1, 2021 ("2021 Notes")	845,000			845,000
Long-term obligations, at par	$	1,645,000		$	1,645,000
Unamortized debt issuance costs and premium, net	(11,032		)	(11,728		)
Long-term obligations, at carrying value	$	1,633,968		$	1,633,272

At March 31, 2017 and December 31, 2016, the fair value of the Company's 2020 Notes was $814.0 million and $820.0 million, respectively, based on quoted market prices for the instrument. At both March 31, 2017 and December 31, 2016, the fair value of the Company's 2021 Notes was $861.9 million based on quoted market prices for the instrument. The fair value of the 2020 Notes and 2021 Notes are considered a Level 2 measure according to the fair value hierarchy.

The Company also maintains a revolving credit facility which as of March 31, 2017 and December 31, 2016, had no outstanding loan balances. At March 31, 2017, approximately $194.0 million was available to borrow and outstanding letters of credit were $126.0 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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LOSS PER SHARE

3 Months Ended

Mar. 31, 2017

Earnings Per Share [Abstract]

LOSS PER SHARE

LOSS PER SHARE

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

	Three Months Ended
	March 31,
	2017			2016
Numerator for basic and diluted loss per share:
Net loss	$	(21,393	)	$	(20,871	)
Denominator:
Basic shares outstanding	57,262			57,617
Dilutive effect of equity-based compensation awards	—			—
Dilutive shares outstanding	57,262			57,617
Basic loss per share:	$	(0.37	)	$	(0.36	)
Diluted loss per share:	$	(0.37	)	$	(0.36	)

As a result of the net loss reported for the three months ended March 31, 2017 and 2016, all then outstanding restricted stock awards and performance awards totaling 659,558 and 474,318, respectively, were excluded from the calculation of diluted loss per share as their inclusion would have an antidilutive effect.

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ACCUMULATED OTHER COMPREHENSIVE LOSS

3 Months Ended

Mar. 31, 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 three months ended March 31, 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	5,823			234			—			6,057
Amounts reclassified out of accumulated other comprehensive loss	—			146			—			146
Tax effects	—			(152		)	—			(152		)
Other comprehensive income	$	5,823		$	228		$	—		$	6,051
Balance at March 31, 2017	$	(206,388	)	$	(93	)	$	(1,794	)	$	(208,275	)

There were no reclassifications out of accumulated other comprehensive loss during the three months ended March 31, 2016.

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STOCK-BASED COMPENSATION

3 Months Ended

Mar. 31, 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 months ended March 31, 2017 and March 31, 2016 was $2.3 million and $2.1 million, respectively. The total income tax benefit recognized in the consolidated statements of operations from stock-based compensation was $0.8 million and $0.5 million for the three months ended March 31, 2017 and March 31, 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 three months ended March 31, 2017:

Restricted Stock	Number of Shares		Weighted Average Grant-Date Fair Value
Balance at January 1, 2017	510,041		$	52.65
Granted	22,794		$	55.64
Vested	(26,963	)	$	54.45
Forfeited	(29,218	)	$	50.97
Balance at March 31, 2017	476,654		$	52.80

As of March 31, 2017, there was $18.5 million of total unrecognized compensation cost arising from restricted stock awards under the Company's Plans. This cost is expected to be recognized over a weighted average period of 3.0 years. The total fair value of restricted stock vested during the three months ended March 31, 2017 and March 31, 2016 was $1.5 million and $3.8 million, respectively.

Performance Stock Awards

The following information relates to performance stock awards that have been granted to employees under the Company's Plans. Performance stock awards are subject to performance criteria established by the compensation committee of the Company's board of directors prior to or at the date of grant. The vesting of the performance stock awards is based on achieving such targets typically based on revenue, Adjusted EBITDA margin, return on invested capital percentage and Total Recordable Incident Rate. In addition, performance stock awards include continued service conditions. The fair value of each performance stock award is based on the closing price of the Company's common stock on the date of grant and is amortized to expense over the service period if achievement of performance measures is considered probable.

The following table summarizes information about performance stock awards for the three months ended March 31, 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	(13,398	)	$	56.26
Balance at March 31, 2017	182,904		$	54.69

As of March 31, 2017, there was $1.0 million of total unrecognized compensation cost arising from unvested performance stock awards deemed probable of vesting under the Company's Plans. The total fair value of performance awards vested during the three months ended March 31, 2017 and March 31, 2016 was $1.4 million and $0.4 million, respectively.

Common Stock Repurchases

On March 13, 2015, the Company's board of directors authorized the repurchase of up to $300 million of the Company's common stock. During the three months ended March 31, 2017, the Company repurchased and retired a total of 0.1 million shares of the Company's common stock for a total cost of $6.8 million. Through March 31, 2017, the Company has repurchased and retired a total of 4.0 million shares of the Company's common stock for a total cost of $206.7 million under this program. As of March 31, 2017, an additional $93.3 million remains available for repurchase of shares under the current authorized program.

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COMMITMENTS AND CONTINGENCIES

3 Months Ended

Mar. 31, 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 March 31, 2017 and December 31, 2016, the Company had recorded reserves of $21.9 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 March 31, 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 $1.7 million and $1.9 million more, respectively. The Company periodically adjusts the aggregate amount of these reserves when actual or probable liabilities are paid or otherwise discharged, new claims arise, or additional relevant information about existing or probable claims becomes available. As of March 31, 2017 and December 31, 2016, the $21.9 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) $4.2 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 March 31, 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 March 31, 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 58 proceedings (excluding cases which have been settled but not formally dismissed) as of March 31, 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 March 31, 2017. From January 1, 2017 to March 31, 2017, 9 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 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 March 31, 2017 and December 31, 2016, there were four and five proceedings, respectively, 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

3 Months Ended

Mar. 31, 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 months ended March 31, 2017 was (14.5)% compared to 10.9% for the same periods in 2016. The variations in the effective income tax rates for the three months ended March 31, 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.

As of both March 31, 2017 and December 31, 2016, the Company had recorded $1.7 million of liabilities for unrecognized tax benefits and $0.3 million of interest.

Due to expiring statute of limitation periods, the Company believes that total unrecognized tax benefits will decrease by $0.5 million within the next 12 months.

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SEGMENT REPORTING

3 Months Ended

Mar. 31, 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 months ended March 31, 2017 and 2016 (in thousands):

	For the Three Months Ended March 31, 2017											For the Three Months Ended March 31, 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	$	230,218	$	40,044		$	722		$	270,984		$	219,105	$	34,844		$	388		$	254,337
Industrial and Field Services	133,557		(8,359		)	104			125,302			130,187		(6,675		)	(13		)	123,499
Safety-Kleen	292,901		(32,069		)	3			260,835			246,961		(28,521		)	366			218,806
Oil, Gas and Lodging Services	32,132		384			94			32,610			39,051		352			104			39,507
Corporate Items	133		—			(923		)	(790		)	779		—			(845		)	(66		)
Total	$	688,941	$	—		$	—		$	688,941		$	636,083	$	—		$	—		$	636,083

The primary financial measure by which the Company evaluates the performance of its segments is Adjusted EBITDA which consists of net loss plus accretion of environmental liabilities, depreciation and amortization, net interest expense, provision (benefit) for income taxes and excludes other expense, net. 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
	March 31,
	2017			2016
Adjusted EBITDA:
Technical Services	$	58,488		$	60,398
Industrial and Field Services	1,913			433
Safety-Kleen	52,368			40,055
Oil, Gas and Lodging Services	(211		)	1,310
Corporate Items	(32,423		)	(34,876		)
Total	$	80,135		$	67,320
Reconciliation to Consolidated Statements of Operations:
Accretion of environmental liabilities	2,290			2,505
Depreciation and amortization	72,412			68,902
Income (loss) from operations	5,433			(4,087		)
Other expense	1,549			350
Interest expense, net of interest income	22,576			18,980
Loss before provision (benefit) for income taxes	$	(18,692	)	$	(23,417	)

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

	March 31, 2017
	Technical Services		Industrial and Field Services		Safety-Kleen		Oil, Gas and Lodging Services		Corporate Items		Totals
Property, plant and equipment, net	$	521,726	$	245,250	$	589,782	$	173,347	$	79,385	$	1,609,490
Goodwill	61,158		108,131		300,571		—		—		469,860
Permits and other intangibles, net	77,131		17,973		386,125		9,723		—		490,952
Total assets	$	856,324	$	446,757	$	1,477,851	$	246,910	$	617,811	$	3,645,653

	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):

	March 31, 2017		December 31, 2016
United States	$	2,947,064	$	2,960,337
Canada	698,589		721,583
Total	$	3,645,653	$	3,681,920

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GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION

3 Months Ended

Mar. 31, 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 March 31, 2017 (in thousands):

	Clean Harbors, Inc.		Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Consolidating Adjustments			Total
Assets:
Cash and cash equivalents	$	51,726	$	139,160	$	106,480	$	—		$	297,366
Intercompany receivables	209,410		396,286		40,235		(645,931		)	—
Accounts receivable, net	—		400,764		79,280		—			480,044
Other current assets	1,033		235,715		59,592		(11,979		)	284,361
Property, plant and equipment, net	—		1,214,176		395,314		—			1,609,490
Investments in subsidiaries	2,849,584		563,331		—		(3,412,915		)	—
Intercompany debt receivable	—		87,215		24,701		(111,916		)	—
Goodwill	—		417,224		52,636		—			469,860
Permits and other intangibles, net	—		429,311		61,641		—			490,952
Other long-term assets	2,421		7,661		4,566		(1,068		)	13,580
Total assets	$	3,114,174	$	3,890,843	$	824,445	$	(4,183,809	)	$	3,645,653
Liabilities and Stockholders’ Equity:
Current liabilities	$	22,063	$	356,914	$	121,583	$	(11,979	)	$	488,581
Intercompany payables	390,812		245,871		9,248		(645,931		)	—
Closure, post-closure and remedial liabilities, net	—		148,992		16,397		—			165,389
Long-term obligations	1,633,968		—		—		—			1,633,968
Intercompany debt payable	3,701		21,000		87,215		(111,916		)	—
Other long-term liabilities	—		276,118		19,035		(1,068		)	294,085
Total liabilities	2,050,544		1,048,895		253,478		(770,894		)	2,582,023
Stockholders’ equity	1,063,630		2,841,948		570,967		(3,412,915		)	1,063,630
Total liabilities and stockholders’ equity	$	3,114,174	$	3,890,843	$	824,445	$	(4,183,809	)	$	3,645,653

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 March 31, 2017 (in thousands):

	Clean Harbors, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues
Service revenues	$	—		$	443,305		$	131,071		$	(14,162	)	$	560,214
Product revenues	—			116,650			15,331			(3,254		)	128,727
Total revenues	—			559,955			146,402			(17,416		)	688,941
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	—			294,145			111,104			(14,162		)	391,087
Product cost of revenues	—			96,505			12,247			(3,254		)	105,498
Total cost of revenues	—			390,650			123,351			(17,416		)	496,585
Selling, general and administrative expenses	24			92,171			20,026			—			112,221
Accretion of environmental liabilities	—			2,055			235			—			2,290
Depreciation and amortization	—			51,900			20,512			—			72,412
(Loss) income from operations	(24		)	23,179			(17,722		)	—			5,433
Other expense	(146		)	(1,389		)	(14		)	—			(1,549		)
Interest (expense) income	(22,659		)	119			(36		)	—			(22,576		)
Equity in earnings of subsidiaries, net of taxes	(7,637		)	(21,824		)	—			29,461			—
Intercompany interest income (expense)	—			1,297			(1,297		)	—			—
(Loss) income before (benefit) provision for income taxes	(30,466		)	1,382			(19,069		)	29,461			(18,692		)
(Benefit) provision for income taxes	(9,073		)	9,637			2,137			—			2,701
Net loss	(21,393		)	(8,255		)	(21,206		)	29,461			(21,393		)
Other comprehensive income	6,051			6,051			5,032			(11,083		)	6,051
Comprehensive loss	$	(15,342	)	$	(2,204	)	$	(16,174	)	$	18,378		$	(15,342	)

Following is the consolidating statement of operations for the three months ended March 31, 2016 (in thousands):

	Clean Harbors, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues
Service revenues	$	—		$	428,477		$	114,023		$	(12,269	)	$	530,231
Product revenues	—			89,588			18,713			(2,449		)	105,852
Total revenues	—			518,065			132,736			(14,718		)	636,083
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	—			282,964			103,291			(12,269		)	373,986
Product cost of revenues	—			79,354			13,388			(2,449		)	90,293
Total cost of revenues	—			362,318			116,679			(14,718		)	464,279
Selling, general and administrative expenses	24			80,655			23,805			—			104,484
Accretion of environmental liabilities	—			2,290			215			—			2,505
Depreciation and amortization	—			48,695			20,207			—			68,902
(Loss) income from operations	(24		)	24,107			(28,170		)	—			(4,087		)
Other expense	—			(88		)	(262		)	—			(350		)
Interest (expense) income	(20,143		)	1,111			52			—			(18,980		)
Equity in earnings of subsidiaries, net of taxes	(8,771		)	(26,495		)	—			35,266			—
Intercompany interest income (expense)	—			5,159			(5,159		)	—			—
(Loss) income before (benefit) provision for income taxes	(28,938		)	3,794			(33,539		)	35,266			(23,417		)
(Benefit) provision for income taxes	(8,067		)	12,565			(7,044		)	—			(2,546		)
Net loss	(20,871		)	(8,771		)	(26,495		)	35,266			(20,871		)
Other comprehensive income	45,837			45,837			28,927			(74,764		)	45,837
Comprehensive income	$	24,966		$	37,066		$	2,432		$	(39,498	)	$	24,966

Following is the condensed consolidating statement of cash flows for the three months ended March 31, 2017 (in thousands):

	Clean Harbors, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Net cash (used in) from operating activities	$	(1,663	)	$	41,144		$	17,638		$	—		$	57,119
Cash flows from (used in) investing activities:
Additions to property, plant and equipment	—			(33,136		)	(9,326		)	—			(42,462		)
Proceeds from sales of fixed assets	—			664			366			—			1,030
Acquisitions, net of cash acquired	—			(11,946		)	—			—			(11,946		)
Proceeds on sale of business	1,837			—			181			—			2,018
Costs to obtain or renew permits	—			(573		)	(178		)	—			(751		)
Proceeds from sale of investments	243			—			—			—			243
Intercompany	—			(7,771		)	—			7,771			—
Net cash from (used in) investing activities	2,080			(52,762		)	(8,957		)	7,771			(51,868		)
Cash flows used in financing activities:
Change in uncashed checks	—			(5,165		)	(2,392		)	—			(7,557		)
Proceeds from exercise of stock options	46			—			—			—			46
Issuance of restricted shares, net of shares remitted	(1,021		)	—			—			—			(1,021		)
Repurchases of common stock	(6,796		)	—			—			—			(6,796		)
Deferred financing costs paid	(108		)	—			—			—			(108		)
Intercompany	7,771			—			—			(7,771		)	—
Net cash used in financing activities	(108		)	(5,165		)	(2,392		)	(7,771		)	(15,436		)
Effect of exchange rate change on cash	—			—			554			—			554
Increase (decrease) in cash and cash equivalents	309			(16,783		)	6,843			—			(9,631		)
Cash and cash equivalents, beginning of period	51,417			155,943			99,637			—			306,997
Cash and cash equivalents, end of period	$	51,726		$	139,160		$	106,480		$	—		$	297,366

Following is the condensed consolidating statement of cash flows for the three months ended March 31, 2016 (in thousands):

	Clean Harbors, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Net cash from (used in) operating activities	$	47,201		$	(3,361	)	$	(4,551	)	$	—		$	39,289
Cash flows used in investing activities:
Additions to property, plant and equipment	—			(64,754		)	(11,027		)	—			(75,781		)
Proceeds from sales of fixed assets	—			277			996			—			1,273
Acquisitions, net of cash acquired	—			(34,993		)	—			—			(34,993		)
Costs to obtain or renew permits	—			(465		)	(47		)	—			(512		)
Intercompany	—			(6,423		)	—			6,423			—
Investment in subsidiaries	(250,625		)	—			—			250,625			—
Net cash used in investing activities	(250,625		)	(106,358		)	(10,078		)	257,048			(110,013		)
Cash flows from (used in) financing activities:
Change in uncashed checks	—			(4,529		)	(689		)	—			(5,218		)
Issuance of restricted shares, net of shares remitted	(1,425		)	—			—			—			(1,425		)
Repurchases of common stock	(4,998		)	—			—			—			(4,998		)
Deferred financing costs paid	(2,190		)	—			—			—			(2,190		)
Issuance of senior secured notes, including premium	250,625			250,625			—			(250,625		)	250,625
Intercompany	6,423			—			—			(6,423		)	—
Net cash from (used in) financing activities	248,435			246,096			(689		)	(257,048		)	236,794
Effect of exchange rate change on cash	—			—			4,567			—			4,567
Increase (decrease) in cash and cash equivalents	45,011			136,377			(10,751		)	—			170,637
Cash and cash equivalents, beginning of period	11,017			83,479			90,212			—			184,708
Cash and cash equivalents, end of period	$	56,028		$	219,856		$	79,461		$	—		$	355,345

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SIGNIFICANT ACCOUNTING POLICIES (Policies)

3 Months Ended

Mar. 31, 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 months ended March 31, 2016 have been recast to reflect the impact of such changes. These reclassifications and adjustments had no effect on consolidated net loss, comprehensive (loss) income, cash flows or 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 March 31, 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.

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, processes, and system requirements. The Company has assigned internal resources to assist in this implementation project and believes that the project is progressing timely. A final decision regarding the adoption method has not been finalized at this time. The Company’s final determination will depend on a number of factors, such as the significance of the impact of the new standard on its financial results, system readiness, and its ability to accumulate and analyze the information necessary to assess the impact on prior period financial statements, as necessary.

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.

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BUSINESS COMBINATIONS (Tables)

3 Months Ended

Mar. 31, 2017

Business Combinations [Abstract]

Schedule of Business Acquisitions, by Acquisition

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

	At Acquisition Dates As Reported December 31, 2016			Measurement Period Adjustments			At Acquisition Dates As Reported March 31, 2017
Accounts receivable	$	15,767		$	629		$	16,396
Inventories and supplies	12,515			173			12,688
Prepaid expenses and other current assets	777			(25		)	752
Property, plant and equipment	143,025			625			143,650
Permits and other intangibles	28,856			—			28,856
Current liabilities	(20,258		)	392			(19,866		)
Closure and post-closure liabilities	(2,408		)	(596		)	(3,004		)
Remedial liabilities, less current portion	(2,041		)	16			(2,025		)
Deferred taxes, unrecognized tax benefits and other long-term liabilities	(17,019		)	(456		)	(17,475		)
Total identifiable net assets	159,214			758			159,972
Goodwill	45,791			(731		)	45,060
Total purchase price, net of cash acquired	$	205,005		$	27		$	205,032

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DISPOSITION OF BUSINESS (Tables)

3 Months Ended

Mar. 31, 2017

Discontinued Operations and Disposal Groups [Abstract]

Disposition of Business

The following table presents the loss before benefit for income taxes attributable to the Catalyst Services business included in the Company's consolidated results of operations for three months ended March 31, 2016 (in thousands):

	Three Months Ended
	March 31, 2016
Loss before benefit for income taxes	1,099

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INVENTORIES AND SUPPLIES (Tables)

3 Months Ended

Mar. 31, 2017

Inventory Disclosure [Abstract]

Schedule of Inventory

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

	March 31, 2017		December 31, 2016
Oil and oil products	$	55,872	$	52,158
Supplies and drums	91,210		90,610
Solvent and solutions	8,865		8,566
Modular camp accommodations	14,859		15,255
Other	11,232		11,839
Total inventories and supplies	$	182,038	$	178,428

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PROPERTY, PLANT AND EQUIPMENT (Tables)

3 Months Ended

Mar. 31, 2017

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

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

	March 31, 2017		December 31, 2016
Land	$	122,184	$	120,575
Asset retirement costs (non-landfill)	15,173		14,567
Landfill assets	140,518		139,708
Buildings and improvements	406,562		373,160
Camp equipment	151,561		152,740
Vehicles	558,175		541,022
Equipment	1,591,511		1,483,736
Furniture and fixtures	5,507		5,492
Construction in progress	42,305		146,904
	3,033,496		2,977,904
Less - accumulated depreciation and amortization	1,424,006		1,366,077
Total property, plant and equipment, net	$	1,609,490	$	1,611,827

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GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)

3 Months Ended

Mar. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of changes to goodwill

The changes in goodwill for the three months ended March 31, 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	—		—		4,938			—		4,938
Measurement period adjustments from prior period acquisitions	—		—		(731		)	—		(731		)
Foreign currency translation and other	42		163		294			—		499
Balance at March 31, 2017	$	61,158	$	108,131	$	300,571		$	—	$	469,860

Summary of indefinite-lived intangible assets

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

	March 31, 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	$	172,666	$	69,151	$	103,515	19.8	$	171,637	$	67,301	$	104,336	18.9
Customer and supplier relationships	394,086		134,599		259,487		11.9	393,426		127,462		265,964		12.2
Other intangible assets	34,463		29,228		5,235		7.1	34,254		28,456		5,798		7.1
Total amortizable permits and other intangible assets	601,215		232,978		368,237		14.9	599,317		223,219		376,098		13.9
Trademarks and trade names	122,715		—		122,715		Indefinite	122,623		—		122,623		Indefinite
Total permits and other intangible assets	$	723,930	$	232,978	$	490,952		$	721,940	$	223,219	$	498,721

Schedule of finite-Lived intangible assets

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

	March 31, 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	$	172,666	$	69,151	$	103,515	19.8	$	171,637	$	67,301	$	104,336	18.9
Customer and supplier relationships	394,086		134,599		259,487		11.9	393,426		127,462		265,964		12.2
Other intangible assets	34,463		29,228		5,235		7.1	34,254		28,456		5,798		7.1
Total amortizable permits and other intangible assets	601,215		232,978		368,237		14.9	599,317		223,219		376,098		13.9
Trademarks and trade names	122,715		—		122,715		Indefinite	122,623		—		122,623		Indefinite
Total permits and other intangible assets	$	723,930	$	232,978	$	490,952		$	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 March 31, 2017 was as follows (in thousands):

Years Ending December 31,	Expected Amortization
2017 (nine months)	$	27,392
2018	34,072
2019	31,275
2020	29,067
2021	26,640
Thereafter	219,791
	$	368,237

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ACCRUED EXPENSES (Tables)

3 Months Ended

Mar. 31, 2017

Payables and Accruals [Abstract]

Accrued expenses

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

	March 31, 2017		December 31, 2016
Insurance	$	56,603	$	63,061
Interest	21,770		21,536
Accrued compensation and benefits	41,109		34,641
Income, real estate, sales and other taxes	29,814		35,083
Other	34,661		36,400
	$	183,957	$	190,721

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CLOSURE AND POST-CLOSURE LIABILITIES (Tables)

3 Months Ended

Mar. 31, 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 March 31, 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	431			—			431
Accretion	534			623			1,157
Changes in estimates recorded to statement of operations	—			(6		)	(6		)
Expenditures	(119		)	(73		)	(192		)
Currency translation and other	20			14			34
Balance at March 31, 2017	$	31,496		$	28,855		$	60,351

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REMEDIAL LIABILITIES (Tables)

3 Months Ended

Mar. 31, 2017

Environmental Remediation Obligations [Abstract]

Changes to remedial liabilities

The changes to remedial liabilities for the three months ended March 31, 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	—			—			(16		)	(16		)
Accretion	21			615			497			1,133
Changes in estimates recorded to statement of operations	(38		)	(94		)	240			108
Expenditures	(7		)	(720		)	(2,019		)	(2,746		)
Currency translation and other	—			8			113			121
Balance at March 31, 2017	$	1,753		$	63,960		$	60,894		$	126,607

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FINANCING ARRANGEMENTS (Tables)

3 Months Ended

Mar. 31, 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):

	March 31, 2017			December 31, 2016
Senior unsecured notes, at 5.25%, due August 1, 2020 ("2020 Notes")	$	800,000		$	800,000
Senior unsecured notes, at 5.125%, due June 1, 2021 ("2021 Notes")	845,000			845,000
Long-term obligations, at par	$	1,645,000		$	1,645,000
Unamortized debt issuance costs and premium, net	(11,032		)	(11,728		)
Long-term obligations, at carrying value	$	1,633,968		$	1,633,272

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LOSS PER SHARE (Tables)

3 Months Ended

Mar. 31, 2017

Earnings Per Share [Abstract]

Reconciliation of basic and diluted earnings per share computations

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

	Three Months Ended
	March 31,
	2017			2016
Numerator for basic and diluted loss per share:
Net loss	$	(21,393	)	$	(20,871	)
Denominator:
Basic shares outstanding	57,262			57,617
Dilutive effect of equity-based compensation awards	—			—
Dilutive shares outstanding	57,262			57,617
Basic loss per share:	$	(0.37	)	$	(0.36	)
Diluted loss per share:	$	(0.37	)	$	(0.36	)

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ACCUMULATED OTHER COMPREHENSIVE LOSS (Tables)

3 Months Ended

Mar. 31, 2017

Equity [Abstract]

Schedule of accumulated other comprehensive loss

The changes in accumulated other comprehensive loss by component and related tax effects for the three months ended March 31, 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	5,823			234			—			6,057
Amounts reclassified out of accumulated other comprehensive loss	—			146			—			146
Tax effects	—			(152		)	—			(152		)
Other comprehensive income	$	5,823		$	228		$	—		$	6,051
Balance at March 31, 2017	$	(206,388	)	$	(93	)	$	(1,794	)	$	(208,275	)

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STOCK-BASED COMPENSATION (Tables)

3 Months Ended

Mar. 31, 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 three months ended March 31, 2017:

Restricted Stock	Number of Shares		Weighted Average Grant-Date Fair Value
Balance at January 1, 2017	510,041		$	52.65
Granted	22,794		$	55.64
Vested	(26,963	)	$	54.45
Forfeited	(29,218	)	$	50.97
Balance at March 31, 2017	476,654		$	52.80

Summary of performance stock awards

The following table summarizes information about performance stock awards for the three months ended March 31, 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	(13,398	)	$	56.26
Balance at March 31, 2017	182,904		$	54.69

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SEGMENT REPORTING (Tables)

3 Months Ended

Mar. 31, 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 months ended March 31, 2017 and 2016 (in thousands):

	For the Three Months Ended March 31, 2017											For the Three Months Ended March 31, 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	$	230,218	$	40,044		$	722		$	270,984		$	219,105	$	34,844		$	388		$	254,337
Industrial and Field Services	133,557		(8,359		)	104			125,302			130,187		(6,675		)	(13		)	123,499
Safety-Kleen	292,901		(32,069		)	3			260,835			246,961		(28,521		)	366			218,806
Oil, Gas and Lodging Services	32,132		384			94			32,610			39,051		352			104			39,507
Corporate Items	133		—			(923		)	(790		)	779		—			(845		)	(66		)
Total	$	688,941	$	—		$	—		$	688,941		$	636,083	$	—		$	—		$	636,083

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
	March 31,
	2017			2016
Adjusted EBITDA:
Technical Services	$	58,488		$	60,398
Industrial and Field Services	1,913			433
Safety-Kleen	52,368			40,055
Oil, Gas and Lodging Services	(211		)	1,310
Corporate Items	(32,423		)	(34,876		)
Total	$	80,135		$	67,320
Reconciliation to Consolidated Statements of Operations:
Accretion of environmental liabilities	2,290			2,505
Depreciation and amortization	72,412			68,902
Income (loss) from operations	5,433			(4,087		)
Other expense	1,549			350
Interest expense, net of interest income	22,576			18,980
Loss before provision (benefit) for income taxes	$	(18,692	)	$	(23,417	)

PP&E, intangible assets and total assets by segment

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

	March 31, 2017
	Technical Services		Industrial and Field Services		Safety-Kleen		Oil, Gas and Lodging Services		Corporate Items		Totals
Property, plant and equipment, net	$	521,726	$	245,250	$	589,782	$	173,347	$	79,385	$	1,609,490
Goodwill	61,158		108,131		300,571		—		—		469,860
Permits and other intangibles, net	77,131		17,973		386,125		9,723		—		490,952
Total assets	$	856,324	$	446,757	$	1,477,851	$	246,910	$	617,811	$	3,645,653

	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):

	March 31, 2017		December 31, 2016
United States	$	2,947,064	$	2,960,337
Canada	698,589		721,583
Total	$	3,645,653	$	3,681,920

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GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION (Tables)

3 Months Ended

Mar. 31, 2017

Guarantor and Non-Guarantor Subsidiaries Financial Information [Abstract]

Schedule of condensed consolidating balance sheet

Following is the condensed consolidating balance sheet at March 31, 2017 (in thousands):

	Clean Harbors, Inc.		Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Consolidating Adjustments			Total
Assets:
Cash and cash equivalents	$	51,726	$	139,160	$	106,480	$	—		$	297,366
Intercompany receivables	209,410		396,286		40,235		(645,931		)	—
Accounts receivable, net	—		400,764		79,280		—			480,044
Other current assets	1,033		235,715		59,592		(11,979		)	284,361
Property, plant and equipment, net	—		1,214,176		395,314		—			1,609,490
Investments in subsidiaries	2,849,584		563,331		—		(3,412,915		)	—
Intercompany debt receivable	—		87,215		24,701		(111,916		)	—
Goodwill	—		417,224		52,636		—			469,860
Permits and other intangibles, net	—		429,311		61,641		—			490,952
Other long-term assets	2,421		7,661		4,566		(1,068		)	13,580
Total assets	$	3,114,174	$	3,890,843	$	824,445	$	(4,183,809	)	$	3,645,653
Liabilities and Stockholders’ Equity:
Current liabilities	$	22,063	$	356,914	$	121,583	$	(11,979	)	$	488,581
Intercompany payables	390,812		245,871		9,248		(645,931		)	—
Closure, post-closure and remedial liabilities, net	—		148,992		16,397		—			165,389
Long-term obligations	1,633,968		—		—		—			1,633,968
Intercompany debt payable	3,701		21,000		87,215		(111,916		)	—
Other long-term liabilities	—		276,118		19,035		(1,068		)	294,085
Total liabilities	2,050,544		1,048,895		253,478		(770,894		)	2,582,023
Stockholders’ equity	1,063,630		2,841,948		570,967		(3,412,915		)	1,063,630
Total liabilities and stockholders’ equity	$	3,114,174	$	3,890,843	$	824,445	$	(4,183,809	)	$	3,645,653

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 March 31, 2017 (in thousands):

	Clean Harbors, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues
Service revenues	$	—		$	443,305		$	131,071		$	(14,162	)	$	560,214
Product revenues	—			116,650			15,331			(3,254		)	128,727
Total revenues	—			559,955			146,402			(17,416		)	688,941
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	—			294,145			111,104			(14,162		)	391,087
Product cost of revenues	—			96,505			12,247			(3,254		)	105,498
Total cost of revenues	—			390,650			123,351			(17,416		)	496,585
Selling, general and administrative expenses	24			92,171			20,026			—			112,221
Accretion of environmental liabilities	—			2,055			235			—			2,290
Depreciation and amortization	—			51,900			20,512			—			72,412
(Loss) income from operations	(24		)	23,179			(17,722		)	—			5,433
Other expense	(146		)	(1,389		)	(14		)	—			(1,549		)
Interest (expense) income	(22,659		)	119			(36		)	—			(22,576		)
Equity in earnings of subsidiaries, net of taxes	(7,637		)	(21,824		)	—			29,461			—
Intercompany interest income (expense)	—			1,297			(1,297		)	—			—
(Loss) income before (benefit) provision for income taxes	(30,466		)	1,382			(19,069		)	29,461			(18,692		)
(Benefit) provision for income taxes	(9,073		)	9,637			2,137			—			2,701
Net loss	(21,393		)	(8,255		)	(21,206		)	29,461			(21,393		)
Other comprehensive income	6,051			6,051			5,032			(11,083		)	6,051
Comprehensive loss	$	(15,342	)	$	(2,204	)	$	(16,174	)	$	18,378		$	(15,342	)

Following is the consolidating statement of operations for the three months ended March 31, 2016 (in thousands):

	Clean Harbors, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues
Service revenues	$	—		$	428,477		$	114,023		$	(12,269	)	$	530,231
Product revenues	—			89,588			18,713			(2,449		)	105,852
Total revenues	—			518,065			132,736			(14,718		)	636,083
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	—			282,964			103,291			(12,269		)	373,986
Product cost of revenues	—			79,354			13,388			(2,449		)	90,293
Total cost of revenues	—			362,318			116,679			(14,718		)	464,279
Selling, general and administrative expenses	24			80,655			23,805			—			104,484
Accretion of environmental liabilities	—			2,290			215			—			2,505
Depreciation and amortization	—			48,695			20,207			—			68,902
(Loss) income from operations	(24		)	24,107			(28,170		)	—			(4,087		)
Other expense	—			(88		)	(262		)	—			(350		)
Interest (expense) income	(20,143		)	1,111			52			—			(18,980		)
Equity in earnings of subsidiaries, net of taxes	(8,771		)	(26,495		)	—			35,266			—
Intercompany interest income (expense)	—			5,159			(5,159		)	—			—
(Loss) income before (benefit) provision for income taxes	(28,938		)	3,794			(33,539		)	35,266			(23,417		)
(Benefit) provision for income taxes	(8,067		)	12,565			(7,044		)	—			(2,546		)
Net loss	(20,871		)	(8,771		)	(26,495		)	35,266			(20,871		)
Other comprehensive income	45,837			45,837			28,927			(74,764		)	45,837
Comprehensive income	$	24,966		$	37,066		$	2,432		$	(39,498	)	$	24,966

Schedule of condensed consolidating statement of cash flows

Following is the condensed consolidating statement of cash flows for the three months ended March 31, 2017 (in thousands):

	Clean Harbors, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Net cash (used in) from operating activities	$	(1,663	)	$	41,144		$	17,638		$	—		$	57,119
Cash flows from (used in) investing activities:
Additions to property, plant and equipment	—			(33,136		)	(9,326		)	—			(42,462		)
Proceeds from sales of fixed assets	—			664			366			—			1,030
Acquisitions, net of cash acquired	—			(11,946		)	—			—			(11,946		)
Proceeds on sale of business	1,837			—			181			—			2,018
Costs to obtain or renew permits	—			(573		)	(178		)	—			(751		)
Proceeds from sale of investments	243			—			—			—			243
Intercompany	—			(7,771		)	—			7,771			—
Net cash from (used in) investing activities	2,080			(52,762		)	(8,957		)	7,771			(51,868		)
Cash flows used in financing activities:
Change in uncashed checks	—			(5,165		)	(2,392		)	—			(7,557		)
Proceeds from exercise of stock options	46			—			—			—			46
Issuance of restricted shares, net of shares remitted	(1,021		)	—			—			—			(1,021		)
Repurchases of common stock	(6,796		)	—			—			—			(6,796		)
Deferred financing costs paid	(108		)	—			—			—			(108		)
Intercompany	7,771			—			—			(7,771		)	—
Net cash used in financing activities	(108		)	(5,165		)	(2,392		)	(7,771		)	(15,436		)
Effect of exchange rate change on cash	—			—			554			—			554
Increase (decrease) in cash and cash equivalents	309			(16,783		)	6,843			—			(9,631		)
Cash and cash equivalents, beginning of period	51,417			155,943			99,637			—			306,997
Cash and cash equivalents, end of period	$	51,726		$	139,160		$	106,480		$	—		$	297,366

Following is the condensed consolidating statement of cash flows for the three months ended March 31, 2016 (in thousands):

	Clean Harbors, Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Net cash from (used in) operating activities	$	47,201		$	(3,361	)	$	(4,551	)	$	—		$	39,289
Cash flows used in investing activities:
Additions to property, plant and equipment	—			(64,754		)	(11,027		)	—			(75,781		)
Proceeds from sales of fixed assets	—			277			996			—			1,273
Acquisitions, net of cash acquired	—			(34,993		)	—			—			(34,993		)
Costs to obtain or renew permits	—			(465		)	(47		)	—			(512		)
Intercompany	—			(6,423		)	—			6,423			—
Investment in subsidiaries	(250,625		)	—			—			250,625			—
Net cash used in investing activities	(250,625		)	(106,358		)	(10,078		)	257,048			(110,013		)
Cash flows from (used in) financing activities:
Change in uncashed checks	—			(4,529		)	(689		)	—			(5,218		)
Issuance of restricted shares, net of shares remitted	(1,425		)	—			—			—			(1,425		)
Repurchases of common stock	(4,998		)	—			—			—			(4,998		)
Deferred financing costs paid	(2,190		)	—			—			—			(2,190		)
Issuance of senior secured notes, including premium	250,625			250,625			—			(250,625		)	250,625
Intercompany	6,423			—			—			(6,423		)	—
Net cash from (used in) financing activities	248,435			246,096			(689		)	(257,048		)	236,794
Effect of exchange rate change on cash	—			—			4,567			—			4,567
Increase (decrease) in cash and cash equivalents	45,011			136,377			(10,751		)	—			170,637
Cash and cash equivalents, beginning of period	11,017			83,479			90,212			—			184,708
Cash and cash equivalents, end of period	$	56,028		$	219,856		$	79,461		$	—		$	355,345

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SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) $ in Thousands	3 Months Ended
	Mar. 31, 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		3 Months Ended	12 Months Ended
	Jan. 31, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($) aquisition rerefinery
Business Acquisition [Line Items]
Goodwill recognized		$ 4,938
2017 Acquisitions
Business Acquisition [Line Items]
Purchase price	$ 11,900
Goodwill recognized	$ 4,900
2016 Acquisitions
Business Acquisition [Line Items]
Purchase price			$ 205,000
Number of acquisitions | aquisition			7
Number of re-refineries acquired | rerefinery			3

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BUSINESS COMBINATIONS (Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Goodwill	$ 469,860	$ 465,154
2016 Acquisitions
Business Acquisition [Line Items]
Accounts receivable	16,396
Measurement period adjustments, accounts receivable	629
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	143,650
Measurement period adjustments, property, plant and equipment	625
Permits and other intangibles	28,856
Measurement period adjustments, permits and other intangibles	0
Current liabilities	(19,866)
Measurement period adjustments, current liabilities	392
Closure and post-closure liabilities	(3,004)
Measurement period adjustments, closure and post-closure liabilities	(596)
Remedial liabilities, less current portion	(2,025)
Measurement period adjustments, remedial liabilities, less current portion	16
Deferred taxes, unrecognized tax benefits and other long-term liabilities	(17,475)
Measurement period adjustments, deferred taxes, unrecognized tax benefits and other long-term liabilities	(456)
Total identifiable net assets	159,972
Measurement period adjustments, total identifiable net assets	758
Goodwill	45,060
Measurement period adjustments, goodwill	(731)
Total purchase price, net of cash acquired	205,032
Measurement period adjustments, total purchase price, net of cash acquired	$ 27
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 (Income (Loss) Attributable to Catalyst Services) (Details) - Catalyst Services - Disposal Group, Disposed of by Sale, Not Discontinued Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Final sale proceeds		$ 2,000
Loss before benefit for income taxes	$ 1,099

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INVENTORIES AND SUPPLIES (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Inventory Disclosure [Abstract]
Oil and oil products	$ 55,872	$ 52,158
Supplies and drums	91,210	90,610
Solvent and solutions	8,865	8,566
Modular camp accommodations	14,859	15,255
Other	11,232	11,839
Total inventories and supplies	$ 182,038	$ 178,428

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PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	$ 3,033,496		$ 2,977,904
Less - accumulated depreciation and amortization	1,424,006		1,366,077
Total property, plant and equipment, net	1,609,490		1,611,827
Interest costs capitalized adjustment	100	$ 1,200
Depreciation inclusive of amortization	63,300	$ 59,300
Land
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	122,184		120,575
Asset retirement costs (non-landfill)
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	15,173		14,567
Landfill assets
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	140,518		139,708
Buildings and improvements
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	406,562		373,160
Camp equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	151,561		152,740
Vehicles
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	558,175		541,022
Equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	1,591,511		1,483,736
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	5,507		5,492
Construction in progress
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	$ 42,305		$ 146,904

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GOODWILL AND OTHER INTANGIBLE ASSETS (Rollforward of Goodwill) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($)
Goodwill [Roll Forward]
Balance at beginning of year	$ 465,154
Increase from current period acquisitions	4,938
Measurement period adjustments from prior period acquisitions	(731)
Foreign currency translation and other	499
Balance at end of year	469,860
Technical Services
Goodwill [Roll Forward]
Balance at beginning of year	61,116
Balance at end of year	61,158
Industrial and Field Services
Goodwill [Roll Forward]
Balance at beginning of year	107,968
Balance at end of year	108,131
Safety-Kleen
Goodwill [Roll Forward]
Balance at beginning of year	296,070
Balance at end of year	300,571
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
Foreign currency translation and other	42
Balance at end of year	61,158
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
Foreign currency translation and other	163
Balance at end of year	108,131
Operating Segments | Safety-Kleen
Goodwill [Roll Forward]
Balance at beginning of year	296,070
Increase from current period acquisitions	4,938
Measurement period adjustments from prior period acquisitions	(731)
Foreign currency translation and other	294
Balance at end of year	300,571
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
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
	Mar. 31, 2017	Mar. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of permits and other intangible assets	$ 9.1	$ 9.6

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GOODWILL AND OTHER INTANGIBLE ASSETS (Amortizable Other Intangible Assets) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Cost	$ 601,215	$ 599,317
Accumulated Amortization	232,978	223,219
Net	$ 368,237	$ 376,098
Weighted Average Remaining Amortization Period (in years)	14 years 329 days	13 years 9 months 40 days
Total permits and other intangible assets, Cost	$ 723,930	$ 721,940
Total permits and other intangible assets, Net	490,952	498,721
Trademarks and trade names
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Trademarks and trade names	122,715	122,623
Permits
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Cost	172,666	171,637
Accumulated Amortization	69,151	67,301
Net	$ 103,515	$ 104,336
Weighted Average Remaining Amortization Period (in years)	19 years 277 days	18 years 9 months 40 days
Customer and supplier relationships
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Cost	$ 394,086	$ 393,426
Accumulated Amortization	134,599	127,462
Net	$ 259,487	$ 265,964
Weighted Average Remaining Amortization Period (in years)	11 years 318 days	12 years 2 months
Other intangible assets
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Cost	$ 34,463	$ 34,254
Accumulated Amortization	29,228	28,456
Net	$ 5,235	$ 5,798
Weighted Average Remaining Amortization Period (in years)	7 years 36 days	7 years 1 month

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GOODWILL AND OTHER INTANGIBLE ASSETS (Expected Future Amortization) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
2017 (nine months)	$ 27,392
2018	34,072
2019	31,275
2020	29,067
2021	26,640
Thereafter	219,791
Net	$ 368,237	$ 376,098

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ACCRUED EXPENSES (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Payables and Accruals [Abstract]
Insurance	$ 56,603	$ 63,061
Interest	21,770	21,536
Accrued compensation and benefits	41,109	34,641
Income, real estate, sales and other taxes	29,814	35,083
Other	34,661	36,400
Total accrued expenses	183,957	190,721
Accrued legal matters	4,200	3,800
Accrued severance charges	$ 2,300	$ 2,900

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CLOSURE AND POST-CLOSURE LIABILITIES (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($)
Changes to post-closure liabilities
Beginning balance	$ 58,331
Measurement period adjustments from prior period acquisitions	596
New asset retirement obligations	431
Accretion	1,157
Changes in estimates recorded to statement of operations	(6)
Expenditures	(192)
Currency translation and other	34
Ending balance	$ 60,351
Credit-adjusted risk-free rate	6.12%
Landfill Retirement Liability
Changes to post-closure liabilities
Beginning balance	$ 30,630
Measurement period adjustments from prior period acquisitions	0
New asset retirement obligations	431
Accretion	534
Changes in estimates recorded to statement of operations	0
Expenditures	(119)
Currency translation and other	20
Ending balance	31,496
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
Accretion	623
Changes in estimates recorded to statement of operations	(6)
Expenditures	(73)
Currency translation and other	14
Ending balance	$ 28,855

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REMEDIAL LIABILITIES (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($)
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at beginning of year	$ 128,007
Measurement period adjustments from prior period acquisitions	(16)
Accretion	1,133
Changes in estimates recorded to statement of operations	108
Expenditures	(2,746)
Currency translation and other	121
Balance at end of year	126,607
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	21
Changes in estimates recorded to statement of operations	(38)
Expenditures	(7)
Currency translation and other	0
Balance at end of year	1,753
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	615
Changes in estimates recorded to statement of operations	(94)
Expenditures	(720)
Currency translation and other	8
Balance at end of year	63,960
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	(16)
Accretion	497
Changes in estimates recorded to statement of operations	240
Expenditures	(2,019)
Currency translation and other	113
Balance at end of year	$ 60,894

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FINANCING ARRANGEMENTS (Details) - USD ($)	Mar. 31, 2017	Dec. 31, 2016
Financing arrangements
Long-term obligations, at par	$ 1,645,000,000	$ 1,645,000,000
Unamortized debt issuance costs and premium, net	(11,032,000)	(11,728,000)
Long-term obligations, at carrying value	1,633,968,000	1,633,272,000
Revolving credit facility, amount outstanding	0	0
Revolving credit facility, available borrowing capacity	194,000,000	195,200,000
Letters of credit amount outstanding	126,000,000	132,600,000
Unsecured debt | Senior unsecured notes, at 5.25%, due August 1, 2020 (2020 Notes)
Financing arrangements
Long-term obligations, at par	$ 800,000,000	800,000,000
Stated interest rate	5.25%
Fair value	$ 814,000,000	820,000,000
Unsecured debt | Senior unsecured notes, at 5.125%, due June 1, 2021 (2021 Notes)
Financing arrangements
Long-term obligations, at par	$ 845,000,000	845,000,000
Stated interest rate	5.125%
Fair value	$ 861,900,000	$ 861,900,000

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LOSS PER SHARE (Computation of Basic and Diluted Earnings Per Share)(Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Numerator for basic and diluted loss per share:
Net loss	$ (21,393)	$ (20,871)
Denominator:
Basic shares outstanding (in shares)	57,262	57,617
Dilutive effect of equity-based compensation awards (in shares)	0	0
Dilutive shares outstanding (in shares)	57,262	57,617
Basic loss per share (in USD per share)	$ (0.37)	$ (0.36)
Diluted loss per share (in USD per share)	$ (0.37)	$ (0.36)

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LOSS PER SHARE (Narrative) (Details) - shares	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Earnings Per Share [Abstract]
Shares excluded from computation of earning per share (in shares)	659,558	474,318

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ACCUMULATED OTHER COMPREHENSIVE LOSS (Changes in Accumulated Other Comprehensive Loss by Component) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Components of Other Accumulated Income, Net of Tax [Roll Forward]
Balance at beginning of period	$ 1,084,241,000
Other comprehensive income before reclassifications	6,057,000
Amounts reclassified out of accumulated other comprehensive loss	146,000	$ 0
Tax effects	(152,000)
Other comprehensive income	6,051,000
Balance at end of period	1,063,630,000
Foreign Currency Translation
Components of Other Accumulated Income, Net of Tax [Roll Forward]
Balance at beginning of period	(212,211,000)
Other comprehensive income before reclassifications	5,823,000
Amounts reclassified out of accumulated other comprehensive loss	0
Tax effects	0
Other comprehensive income	5,823,000
Balance at end of period	(206,388,000)
Unrealized Gains on Available-For-Sale Securities
Components of Other Accumulated Income, Net of Tax [Roll Forward]
Balance at beginning of period	(321,000)
Other comprehensive income before reclassifications	234,000
Amounts reclassified out of accumulated other comprehensive loss	146,000
Tax effects	(152,000)
Other comprehensive income	228,000
Balance at end of period	(93,000)
Unfunded Pension Liability
Components of Other Accumulated Income, Net of Tax [Roll Forward]
Balance at beginning of period	(1,794,000)
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	(1,794,000)
Total
Components of Other Accumulated Income, Net of Tax [Roll Forward]
Balance at beginning of period	(214,326,000)
Balance at end of period	$ (208,275,000)

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ACCUMULATED OTHER COMPREHENSIVE LOSS (Amount Reclassified Out of Accumulated Other Comprehensive Loss) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Equity [Abstract]
Amounts reclassified out of accumulated other comprehensive loss	$ (146,000)	$ 0

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STOCK-BASED COMPENSATION (Narrative) (Details) - USD ($) shares in Millions	3 Months Ended		25 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 13, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	$ 2,300,000	$ 2,100,000
Income tax benefit	$ 800,000	500,000
Share repurchase program authorized				$ 300,000,000
Repurchases of common stock (in shares)	0.1		4.0
Repurchases of common stock	$ 6,796,000		$ 206,700,000
Stock repurchase program, remaining authorized repurchase amount	93,300,000		93,300,000
Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	$ 18,500,000		18,500,000
Period for recognition	3 years
Fair value restricted stock	$ 1,500,000	3,800,000
Performance stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	1,000,000		$ 1,000,000
Fair value restricted stock	$ 1,400,000	$ 400,000
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	5 years

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STOCK-BASED COMPENSATION (Restricted Stock) (Details) - Restricted stock awards	3 Months Ended
	Mar. 31, 2017 $ / shares shares
Number of Shares
Beginning balance (in shares) | shares	510,041
Granted (in shares) | shares	22,794
Vested (in shares) | shares	(26,963)
Forfeited (in shares) | shares	(29,218)
Ending balance (in shares) | shares	476,654
Weighted Average Grant-Date Fair Value
Beginning of period (in USD per share) | $ / shares	$ 52.65
Granted (in USD per share) | $ / shares	55.64
Vested (in USD per share) | $ / shares	54.45
Forfeited (in USD per share) | $ / shares	50.97
End of period (in USD per share) | $ / shares	$ 52.80

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STOCK-BASED COMPENSATION (Performance Stock Awards (Details) - Performance stock awards	3 Months Ended
	Mar. 31, 2017 $ / shares shares
Number of Shares
Beginning balance (in shares) | shares	220,882
Granted (in shares) | shares	588
Vested (in shares) | shares	(25,168)
Forfeited (in shares) | shares	(13,398)
Ending balance (in shares) | shares	182,904
Weighted Average Grant-Date Fair Value
Beginning of period (in USD per share) | $ / shares	$ 54.69
Granted (in USD per share) | $ / shares	54.44
Vested (in USD per share) | $ / shares	54.84
Forfeited (in USD per share) | $ / shares	56.26
End of period (in USD per share) | $ / shares	$ 54.69

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COMMITMENTS AND CONTINGENCIES (Details) CAD in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2017 USD ($) site proceeding claim	Dec. 31, 2012 CAD	Dec. 31, 1999 municipality	Dec. 31, 1968 permit	Dec. 31, 2016 USD ($) proceeding
Contingencies [Line Items]
Recorded reserves for actual or probable liabilities | $	$ 21,900,000				$ 22,000,000
Number of pending personal injury claims allegedly resulting from the use of Safety-Kleen's products | proceeding	58
Number of product liability claims settled or dismissed | claim	9
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 | $	$ 1,700,000				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 | $	$ 4,200,000				$ 3,800,000
Number of pending personal injury claims allegedly resulting from the use of Safety-Kleen's products | proceeding	4				5
Federal and State Enforcement Actions | Minimum
Contingencies [Line Items]
Minimum potential liability | $	$ 100,000				$ 100,000

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INCOME TAXES (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Effective income tax rate	(14.50%)	10.90%
Unrecognized tax benefits	$ 1.7		$ 1.7
Interest on unrecognized tax benefits	0.3		$ 0.3
Reduction in unrecognized tax benefits from expiring statue of limitations	$ 0.5

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SEGMENT REPORTING (Narrative) (Details)	3 Months Ended
	Mar. 31, 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
	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Total revenues	$ 688,941	$ 636,083
Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	0	0
Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	0	0
Direct revenues
Segment Reporting Information [Line Items]
Total revenues	688,941	636,083
Technical Services
Segment Reporting Information [Line Items]
Total revenues	230,218	219,105
Technical Services | Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	40,044	34,844
Technical Services | Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	722	388
Technical Services | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	270,984	254,337
Industrial and Field Services
Segment Reporting Information [Line Items]
Total revenues	133,557	130,187
Industrial and Field Services | Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	(8,359)	(6,675)
Industrial and Field Services | Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	104	(13)
Industrial and Field Services | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	125,302	123,499
Safety-Kleen
Segment Reporting Information [Line Items]
Total revenues	292,901	246,961
Safety-Kleen | Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	(32,069)	(28,521)
Safety-Kleen | Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	3	366
Safety-Kleen | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	260,835	218,806
Oil, Gas and Lodging Services
Segment Reporting Information [Line Items]
Total revenues	32,132	39,051
Oil, Gas and Lodging Services | Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	384	352
Oil, Gas and Lodging Services | Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	94	104
Oil, Gas and Lodging Services | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	32,610	39,507
Corporate Items
Segment Reporting Information [Line Items]
Total revenues	133	779
Corporate Items | Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	0	0
Corporate Items | Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	(923)	(845)
Corporate Items | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	$ (790)	$ (66)

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SEGMENT REPORTING (Adjusted EBITDA Information) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Adjusted EBITDA	$ 80,135	$ 67,320
Reconciliation to Consolidated Statements of Operations:
Accretion of environmental liabilities	2,290	2,505
Depreciation and amortization	72,412	68,902
Income (loss) from operations	5,433	(4,087)
Other expense	1,549	350
Interest expense, net of interest income	22,576	18,980
(Loss) income before (benefit) provision for income taxes	(18,692)	(23,417)
Technical Services
Segment Reporting Information [Line Items]
Adjusted EBITDA	58,488	60,398
Industrial and Field Services
Segment Reporting Information [Line Items]
Adjusted EBITDA	1,913	433
Safety-Kleen
Segment Reporting Information [Line Items]
Adjusted EBITDA	52,368	40,055
Oil, Gas and Lodging Services
Segment Reporting Information [Line Items]
Adjusted EBITDA	(211)	1,310
Corporate Items
Segment Reporting Information [Line Items]
Adjusted EBITDA	$ (32,423)	$ (34,876)

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SEGMENT REPORTING (Assets by Reportable Segment) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Property, plant and equipment, net	$ 1,609,490	$ 1,611,827
Goodwill	469,860	465,154
Permits and other intangibles, net	490,952	498,721
Total assets	3,645,653	3,681,920
Technical Services
Segment Reporting Information [Line Items]
Property, plant and equipment, net	521,726	521,134
Goodwill	61,158	61,116
Permits and other intangibles, net	77,131	78,625
Total assets	856,324	862,957
Industrial and Field Services
Segment Reporting Information [Line Items]
Property, plant and equipment, net	245,250	245,143
Goodwill	108,131	107,968
Permits and other intangibles, net	17,973	17,817
Total assets	446,757	446,826
Safety-Kleen
Segment Reporting Information [Line Items]
Property, plant and equipment, net	589,782	584,647
Goodwill	300,571	296,070
Permits and other intangibles, net	386,125	391,390
Total assets	1,477,851	1,474,755
Oil, Gas and Lodging Services
Segment Reporting Information [Line Items]
Property, plant and equipment, net	173,347	182,038
Goodwill	0	0
Permits and other intangibles, net	9,723	10,889
Total assets	246,910	253,242
Corporate Items
Segment Reporting Information [Line Items]
Property, plant and equipment, net	79,385	78,865
Goodwill	0	0
Permits and other intangibles, net	0	0
Total assets	$ 617,811	$ 644,140

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SEGMENT REPORTING (Total Assets by Geographical Area) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Total assets	$ 3,645,653	$ 3,681,920
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total assets	2,947,064	2,960,337
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Total assets	$ 698,589	$ 721,583

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GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION (Narrative) (Details)	3 Months Ended
	Mar. 31, 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	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
ASSETS
Cash and cash equivalents	$ 297,366	$ 306,997	$ 355,345	$ 184,708
Intercompany receivables	0	0
Accounts receivable, net	480,044	496,226
Other current assets	284,361	289,648
Property, plant and equipment, net	1,609,490	1,611,827
Investments in subsidiaries	0	0
Intercompany debt receivable	0	0
Goodwill	469,860	465,154
Permits and other intangibles, net	490,952	498,721
Other long-term assets	13,580	13,347
Total assets	3,645,653	3,681,920
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities	488,581	504,668
Intercompany payables	0	0
Closure, post-closure and remedial liabilities, net	165,389	166,322
Long-term obligations	1,633,968	1,633,272
Intercompany debt payable	0	0
Other long-term liabilities	294,085	293,417
Total liabilities	2,582,023	2,597,679
Stockholders’ equity	1,063,630	1,084,241
Total liabilities and stockholders’ equity	3,645,653	3,681,920
Reportable Legal Entities | Clean Harbors, Inc.
ASSETS
Cash and cash equivalents	51,726	51,417	56,028	11,017
Intercompany receivables	209,410	200,337
Accounts receivable, net	0	0
Other current assets	1,033	3,096
Property, plant and equipment, net	0	0
Investments in subsidiaries	2,849,584	2,851,571
Intercompany debt receivable	0	0
Goodwill	0	0
Permits and other intangibles, net	0	0
Other long-term assets	2,421	2,446
Total assets	3,114,174	3,108,867
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities	22,063	21,805
Intercompany payables	390,812	365,848
Closure, post-closure and remedial liabilities, net	0	0
Long-term obligations	1,633,968	1,633,272
Intercompany debt payable	3,701	3,701
Other long-term liabilities	0	0
Total liabilities	2,050,544	2,024,626
Stockholders’ equity	1,063,630	1,084,241
Total liabilities and stockholders’ equity	3,114,174	3,108,867
Reportable Legal Entities | Guarantor Subsidiaries
ASSETS
Cash and cash equivalents	139,160	155,943	219,856	83,479
Intercompany receivables	396,286	354,836
Accounts receivable, net	400,764	417,029
Other current assets	235,715	234,408
Property, plant and equipment, net	1,214,176	1,211,210
Investments in subsidiaries	563,331	580,124
Intercompany debt receivable	87,215	86,409
Goodwill	417,224	412,638
Permits and other intangibles, net	429,311	435,594
Other long-term assets	7,661	7,582
Total assets	3,890,843	3,895,773
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities	356,914	366,831
Intercompany payables	245,871	237,058
Closure, post-closure and remedial liabilities, net	148,992	150,682
Long-term obligations	0	0
Intercompany debt payable	21,000	21,000
Other long-term liabilities	276,118	275,649
Total liabilities	1,048,895	1,051,220
Stockholders’ equity	2,841,948	2,844,553
Total liabilities and stockholders’ equity	3,890,843	3,895,773
Reportable Legal Entities | Non-Guarantor Subsidiaries
ASSETS
Cash and cash equivalents	106,480	99,637	79,461	90,212
Intercompany receivables	40,235	49,055
Accounts receivable, net	79,280	79,197
Other current assets	59,592	69,257
Property, plant and equipment, net	395,314	400,617
Investments in subsidiaries	0	0
Intercompany debt receivable	24,701	24,701
Goodwill	52,636	52,516
Permits and other intangibles, net	61,641	63,127
Other long-term assets	4,566	4,387
Total assets	824,445	842,494
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities	121,583	133,145
Intercompany payables	9,248	1,322
Closure, post-closure and remedial liabilities, net	16,397	15,640
Long-term obligations	0	0
Intercompany debt payable	87,215	86,409
Other long-term liabilities	19,035	18,836
Total liabilities	253,478	255,352
Stockholders’ equity	570,967	587,142
Total liabilities and stockholders’ equity	824,445	842,494
Consolidating Adjustments
ASSETS
Cash and cash equivalents	0	0	$ 0	$ 0
Intercompany receivables	(645,931)	(604,228)
Accounts receivable, net	0	0
Other current assets	(11,979)	(17,113)
Property, plant and equipment, net	0	0
Investments in subsidiaries	(3,412,915)	(3,431,695)
Intercompany debt receivable	(111,916)	(111,110)
Goodwill	0	0
Permits and other intangibles, net	0	0
Other long-term assets	(1,068)	(1,068)
Total assets	(4,183,809)	(4,165,214)
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities	(11,979)	(17,113)
Intercompany payables	(645,931)	(604,228)
Closure, post-closure and remedial liabilities, net	0	0
Long-term obligations	0	0
Intercompany debt payable	(111,916)	(111,110)
Other long-term liabilities	(1,068)	(1,068)
Total liabilities	(770,894)	(733,519)
Stockholders’ equity	(3,412,915)	(3,431,695)
Total liabilities and stockholders’ equity	$ (4,183,809)	$ (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
	Mar. 31, 2017	Mar. 31, 2016
Revenues:
Service revenues	$ 560,214	$ 530,231
Product revenues	128,727	105,852
Total revenues	688,941	636,083
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	391,087	373,986
Product cost of revenues	105,498	90,293
Total cost of revenues	496,585	464,279
Selling, general and administrative expenses	112,221	104,484
Accretion of environmental liabilities	2,290	2,505
Depreciation and amortization	72,412	68,902
(Loss) income from operations	5,433	(4,087)
Other expense	(1,549)	(350)
Interest (expense) income	(22,576)	(18,980)
Equity in earnings of subsidiaries, net of taxes	0	0
Intercompany interest income (expense)	0	0
(Loss) income before (benefit) provision for income taxes	(18,692)	(23,417)
(Benefit) provision for income taxes	2,701	(2,546)
Net loss	(21,393)	(20,871)
Other comprehensive income	6,051	45,837
Comprehensive (loss) income	(15,342)	24,966
Reportable Legal Entities | Clean Harbors, Inc.
Revenues:
Service revenues	0	0
Product revenues	0	0
Total revenues	0	0
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	0	0
Product cost of revenues	0	0
Total cost of revenues	0	0
Selling, general and administrative expenses	24	24
Accretion of environmental liabilities	0	0
Depreciation and amortization	0	0
(Loss) income from operations	(24)	(24)
Other expense	(146)	0
Interest (expense) income	(22,659)	(20,143)
Equity in earnings of subsidiaries, net of taxes	(7,637)	(8,771)
Intercompany interest income (expense)	0	0
(Loss) income before (benefit) provision for income taxes	(30,466)	(28,938)
(Benefit) provision for income taxes	(9,073)	(8,067)
Net loss	(21,393)	(20,871)
Other comprehensive income	6,051	45,837
Comprehensive (loss) income	(15,342)	24,966
Reportable Legal Entities | Guarantor Subsidiaries
Revenues:
Service revenues	443,305	428,477
Product revenues	116,650	89,588
Total revenues	559,955	518,065
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	294,145	282,964
Product cost of revenues	96,505	79,354
Total cost of revenues	390,650	362,318
Selling, general and administrative expenses	92,171	80,655
Accretion of environmental liabilities	2,055	2,290
Depreciation and amortization	51,900	48,695
(Loss) income from operations	23,179	24,107
Other expense	(1,389)	(88)
Interest (expense) income	119	1,111
Equity in earnings of subsidiaries, net of taxes	(21,824)	(26,495)
Intercompany interest income (expense)	1,297	5,159
(Loss) income before (benefit) provision for income taxes	1,382	3,794
(Benefit) provision for income taxes	9,637	12,565
Net loss	(8,255)	(8,771)
Other comprehensive income	6,051	45,837
Comprehensive (loss) income	(2,204)	37,066
Reportable Legal Entities | Non-Guarantor Subsidiaries
Revenues:
Service revenues	131,071	114,023
Product revenues	15,331	18,713
Total revenues	146,402	132,736
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	111,104	103,291
Product cost of revenues	12,247	13,388
Total cost of revenues	123,351	116,679
Selling, general and administrative expenses	20,026	23,805
Accretion of environmental liabilities	235	215
Depreciation and amortization	20,512	20,207
(Loss) income from operations	(17,722)	(28,170)
Other expense	(14)	(262)
Interest (expense) income	(36)	52
Equity in earnings of subsidiaries, net of taxes	0	0
Intercompany interest income (expense)	(1,297)	(5,159)
(Loss) income before (benefit) provision for income taxes	(19,069)	(33,539)
(Benefit) provision for income taxes	2,137	(7,044)
Net loss	(21,206)	(26,495)
Other comprehensive income	5,032	28,927
Comprehensive (loss) income	(16,174)	2,432
Consolidating Adjustments
Revenues:
Service revenues	(14,162)	(12,269)
Product revenues	(3,254)	(2,449)
Total revenues	(17,416)	(14,718)
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	(14,162)	(12,269)
Product cost of revenues	(3,254)	(2,449)
Total cost of revenues	(17,416)	(14,718)
Selling, general and administrative expenses	0	0
Accretion of environmental liabilities	0	0
Depreciation and amortization	0	0
(Loss) income from operations	0	0
Other expense	0	0
Interest (expense) income	0	0
Equity in earnings of subsidiaries, net of taxes	29,461	35,266
Intercompany interest income (expense)	0	0
(Loss) income before (benefit) provision for income taxes	29,461	35,266
(Benefit) provision for income taxes	0	0
Net loss	29,461	35,266
Other comprehensive income	(11,083)	(74,764)
Comprehensive (loss) income	$ 18,378	$ (39,498)

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GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION (Condensed Consolidating Statements of Cash Flows) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Condensed consolidating statement of cash flows
Net cash (used in) from operating activities	$ 57,119	$ 39,289
Cash flows from (used in) investing activities:
Additions to property, plant and equipment	(42,462)	(75,781)
Proceeds from sales of fixed assets	1,030	1,273
Acquisitions, net of cash acquired	(11,946)	(34,993)
Proceeds on sale of business	2,018	0
Costs to obtain or renew permits	(751)	(512)
Proceeds from sale of investments	243	0
Intercompany	0	0
Investment in subsidiaries		0
Net cash used in investing activities	(51,868)	(110,013)
Cash flows used in financing activities:
Change in uncashed checks	(7,557)	(5,218)
Proceeds from exercise of stock options	46	0
Issuance of restricted shares, net of shares remitted	(1,021)	(1,425)
Repurchases of common stock	(6,796)	(4,998)
Deferred financing costs paid	(108)	(2,190)
Issuance of senior secured notes, including premium	0	250,625
Intercompany	0	0
Net cash (used in) from financing activities	(15,436)	236,794
Effect of exchange rate change on cash	554	4,567
Increase (decrease) in cash and cash equivalents	(9,631)	170,637
Cash and cash equivalents, beginning of period	306,997	184,708
Cash and cash equivalents, end of period	297,366	355,345
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 business	0
Costs to obtain or renew permits	0	0
Proceeds from sale of investments	0
Intercompany	7,771	6,423
Investment in subsidiaries		250,625
Net cash used in investing activities	7,771	257,048
Cash flows used in financing activities:
Change in uncashed checks	0	0
Proceeds from exercise of stock options	0
Issuance of restricted shares, net of shares remitted	0	0
Repurchases of common stock	0	0
Deferred financing costs paid	0	0
Issuance of senior secured notes, including premium		(250,625)
Intercompany	(7,771)	(6,423)
Net cash (used in) from financing activities	(7,771)	(257,048)
Effect of exchange rate change on cash	0	0
Increase (decrease) in cash and cash equivalents	0	0
Cash and cash equivalents, beginning of period	0	0
Cash and cash equivalents, end of period	0	0
Clean Harbors, Inc. | Reportable Legal Entities
Condensed consolidating statement of cash flows
Net cash (used in) from operating activities	(1,663)	47,201
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 business	1,837
Costs to obtain or renew permits	0	0
Proceeds from sale of investments	243
Intercompany	0	0
Investment in subsidiaries		(250,625)
Net cash used in investing activities	2,080	(250,625)
Cash flows used in financing activities:
Change in uncashed checks	0	0
Proceeds from exercise of stock options	46
Issuance of restricted shares, net of shares remitted	(1,021)	(1,425)
Repurchases of common stock	(6,796)	(4,998)
Deferred financing costs paid	(108)	(2,190)
Issuance of senior secured notes, including premium		250,625
Intercompany	7,771	6,423
Net cash (used in) from financing activities	(108)	248,435
Effect of exchange rate change on cash	0	0
Increase (decrease) in cash and cash equivalents	309	45,011
Cash and cash equivalents, beginning of period	51,417	11,017
Cash and cash equivalents, end of period	51,726	56,028
Guarantor Subsidiaries | Reportable Legal Entities
Condensed consolidating statement of cash flows
Net cash (used in) from operating activities	41,144	(3,361)
Cash flows from (used in) investing activities:
Additions to property, plant and equipment	(33,136)	(64,754)
Proceeds from sales of fixed assets	664	277
Acquisitions, net of cash acquired	(11,946)	(34,993)
Proceeds on sale of business	0
Costs to obtain or renew permits	(573)	(465)
Proceeds from sale of investments	0
Intercompany	(7,771)	(6,423)
Investment in subsidiaries		0
Net cash used in investing activities	(52,762)	(106,358)
Cash flows used in financing activities:
Change in uncashed checks	(5,165)	(4,529)
Proceeds from exercise of stock options	0
Issuance of restricted shares, net of shares remitted	0	0
Repurchases of common stock	0	0
Deferred financing costs paid	0	0
Issuance of senior secured notes, including premium		250,625
Intercompany	0	0
Net cash (used in) from financing activities	(5,165)	246,096
Effect of exchange rate change on cash	0	0
Increase (decrease) in cash and cash equivalents	(16,783)	136,377
Cash and cash equivalents, beginning of period	155,943	83,479
Cash and cash equivalents, end of period	139,160	219,856
Non-Guarantor Subsidiaries | Reportable Legal Entities
Condensed consolidating statement of cash flows
Net cash (used in) from operating activities	17,638	(4,551)
Cash flows from (used in) investing activities:
Additions to property, plant and equipment	(9,326)	(11,027)
Proceeds from sales of fixed assets	366	996
Acquisitions, net of cash acquired	0	0
Proceeds on sale of business	181
Costs to obtain or renew permits	(178)	(47)
Proceeds from sale of investments	0
Intercompany	0	0
Investment in subsidiaries		0
Net cash used in investing activities	(8,957)	(10,078)
Cash flows used in financing activities:
Change in uncashed checks	(2,392)	(689)
Proceeds from exercise of stock options	0
Issuance of restricted shares, net of shares remitted	0	0
Repurchases of common stock	0	0
Deferred financing costs paid	0	0
Issuance of senior secured notes, including premium		0
Intercompany	0	0
Net cash (used in) from financing activities	(2,392)	(689)
Effect of exchange rate change on cash	554	4,567
Increase (decrease) in cash and cash equivalents	6,843	(10,751)
Cash and cash equivalents, beginning of period	99,637	90,212
Cash and cash equivalents, end of period	$ 106,480	$ 79,461