10-Q

UNITED STATES OF AMERICA

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

_______________________

FORM 10-Q

x	QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
FOR THE QUARTERLY PERIOD ENDED JUNE 30, 2014
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, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer,” and “smaller reporting 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)

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	60,640,103
(Class)	(Outstanding as of August 4, 2014)

CLEAN HARBORS, INC.

QUARTERLY REPORT ON FORM 10-Q

TABLE OF CONTENTS

	Page No.
PART I: FINANCIAL INFORMATION
ITEM 1: Unaudited Financial Statements
Unaudited Consolidated Balance Sheets	1
Unaudited Consolidated Statements of Income	2
Unaudited Consolidated Statements of Comprehensive Income (Loss)	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	26
ITEM 3: Quantitative and Qualitative Disclosures About Market Risk	34
ITEM 4: Controls and Procedures	34
PART II: OTHER INFORMATION
ITEM 1: Legal Proceedings	35
ITEM 1A: Risk Factors	35
ITEM 2: Unregistered Sales of Equity Securities and Use of Proceeds	35
ITEM 3: Defaults Upon Senior Securities	35
ITEM 4: Mine Safety Disclosures	35
ITEM 5: Other Information	35
ITEM 6: Exhibits	36
Signatures	37

CLEAN HARBORS, INC. AND SUBSIDIARIES

UNAUDITED CONSOLIDATED BALANCE SHEETS

(in thousands)

	June 30, 2014			December 31, 2013
ASSETS
Current assets:
Cash and cash equivalents	$	278,644		$	310,073
Marketable securities	—			12,435
Accounts receivable, net of allowances aggregating $21,446 and $18,106, respectively	575,187			579,394
Unbilled accounts receivable	35,529			26,568
Deferred costs	17,909			16,134
Inventories and supplies	161,792			152,096
Prepaid expenses and other current assets	48,991			41,962
Deferred tax assets	32,239			32,517
Total current assets	1,150,291			1,171,179
Property, plant and equipment, net	1,611,298			1,602,170
Other assets:
Deferred financing costs	19,284			20,860
Goodwill	578,974			570,960
Permits and other intangibles, net	553,658			569,973
Other	18,938			18,536
Total other assets	1,170,854			1,180,329
Total assets	$	3,932,443		$	3,953,678
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
Current portion of capital lease obligations	$	709		$	1,329
Accounts payable	262,553			316,462
Deferred revenue	61,593			55,454
Accrued expenses	245,368			236,829
Current portion of closure, post-closure and remedial liabilities	36,043			29,471
Total current liabilities	606,266			639,545
Other liabilities:
Closure and post-closure liabilities, less current portion of $6,252 and $5,884, respectively	43,630			41,201
Remedial liabilities, less current portion of $29,791 and $23,587, respectively	138,036			148,911
Long-term obligations	1,395,000			1,400,000
Capital lease obligations, less current portion	827			1,435
Deferred taxes, unrecognized tax benefits and other long-term liabilities	249,968			246,947
Total other liabilities	1,827,461			1,838,494
Stockholders’ equity:
Common stock, $.01 par value:
Authorized 80,000,000; shares issued and outstanding 60,579,425 and 60,672,180  shares, respectively	606			607
Shares held under employee participation plan	(469		)	(469		)
Additional paid-in capital	889,080			898,165
Accumulated other comprehensive loss	(25,025		)	(19,556		)
Accumulated earnings	634,524			596,892
Total stockholders’ equity	1,498,716			1,475,639
Total liabilities and stockholders’ equity	$	3,932,443		$	3,953,678

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

1

CLEAN HARBORS, INC. AND SUBSIDIARIES

UNAUDITED CONSOLIDATED STATEMENTS OF INCOME

(in thousands except per share amounts)

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2014			2013			2014			2013
Revenues:
Service revenues	$	665,275		$	673,872		$	1,325,370		$	1,346,494
Product revenues	193,205			186,656			379,777			376,197
Total revenues	858,480			860,528			1,705,147			1,722,691
Cost of revenues (exclusive of items shown separately below)
Service revenues	445,757			455,603			912,556			923,975
Product revenues	161,193			158,723			320,113			326,375
Total cost of revenues	606,950			614,326			1,232,669			1,250,350
Selling, general and administrative expenses	115,731			122,612			234,693			251,082
Accretion of environmental liabilities	2,609			2,879			5,333			5,714
Depreciation and amortization	66,075			67,468			135,431			127,474
Income from operations	67,115			53,243			97,021			88,071
Other (expense) income	(655		)	1,655			3,523			2,180
Interest expense, net of interest income of $211, $155, $416 and $266, respectively	(19,382		)	(19,585		)	(38,936		)	(39,458		)
Income before provision for income taxes	47,078			35,313			61,608			50,793
Provision for income taxes	18,406			12,411			23,976			17,389
Net income	$	28,672		$	22,902		$	37,632		$	33,404
Earnings per share:
Basic	$	0.47		$	0.38		$	0.62		$	0.55
Diluted	$	0.47		$	0.38		$	0.62		$	0.55
Shares used to compute earnings per share - Basic	60,665			60,550			60,695			60,507
Shares used to compute earnings per share - Diluted	60,778			60,687			60,822			60,658

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

2

CLEAN HARBORS, INC. AND SUBSIDIARIES

UNAUDITED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)

(in thousands)

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2014			2013			2014			2013
Net income	$	28,672		$	22,902		$	37,632		$	33,404
Other comprehensive income (loss):
Unrealized (losses) gains on available-for-sale securities (net of taxes of $11, $22, $141 and $92respectively)	(61		)	(166		)	799			(715		)
Reclassification adjustment for gains on available-for-sale securities included in net income (net of taxes of $8, $0, $504 and $0 respectively)	(45		)	—			(2,857		)	—
Foreign currency translation adjustments	36,162			(35,340		)	(3,411		)	(58,652		)
Other comprehensive income (loss)	36,056			(35,506		)	(5,469		)	(59,367		)
Comprehensive income (loss)	$	64,728		$	(12,604	)	$	32,163		$	(25,963	)

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

3

CLEAN HARBORS, INC. AND SUBSIDIARIES

UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS

(in thousands)

	Six Months Ended
	June 30,
	2014			2013
Cash flows from operating activities:
Net income	$	37,632		$	33,404
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	135,431			127,474
Pre-tax, non-cash acquisition accounting inventory adjustments	—			13,559
Allowance for doubtful accounts	4,605			3,618
Amortization of deferred financing costs and debt discount	1,576			1,692
Accretion of environmental liabilities	5,333			5,714
Changes in environmental liability estimates	(1,429		)	(393		)
Deferred income taxes	(1		)	(8		)
Stock-based compensation	4,340			3,924
Excess tax benefit of stock-based compensation	(644		)	(1,326		)
Income tax benefit related to stock option exercises	644			1,316
Other expense (income)	(3,523		)	(2,180		)
Environmental expenditures	(7,443		)	(9,793		)
Changes in assets and liabilities, net of acquisitions
Accounts receivable	(689		)	(20,783		)
Inventories and supplies	(9,556		)	1,128
Other current assets	(17,574		)	5,027
Accounts payable	(46,421		)	(33,426		)
Other current and long-term liabilities	12,663			8,665
Net cash from operating activities	114,944			137,612
Cash flows from investing activities:
Additions to property, plant and equipment	(138,186		)	(141,466		)
Proceeds from sales of fixed assets	2,986			2,194
Proceeds from sales of marketable securities	12,947			—
Acquisitions, net of cash acquired	(6,150		)	—
Additions to intangible assets, including costs to obtain or renew permits	(2,891		)	(2,169		)
Net cash used in investing activities	(131,294		)	(141,441		)
Cash flows from financing activities:
Change in uncashed checks	3,162			40,356
Proceeds from exercise of stock options	—			399
Remittance of shares, net	(2,215		)	(169		)
Repurchases of common stock	(14,657		)	—
Proceeds from employee stock purchase plan	4,364			3,391
Deferred financing costs paid	—			(2,446		)
Repayment of long-term obligations	(5,000		)	—
Payments on capital leases	(1,190		)	(2,588		)
Issuance costs related to 2012 issuance of common stock	—			(250		)
Excess tax benefit of stock-based compensation	644			1,326
Net cash from financing activities	(14,892		)	40,019
Effect of exchange rate change on cash	(187		)	(2,548		)
(Decrease) increase in cash and cash equivalents	(31,429		)	33,642
Cash and cash equivalents, beginning of period	310,073			229,836
Cash and cash equivalents, end of period	$	278,644		$	263,478
Supplemental information:
Cash payments for interest and income taxes:
Interest paid	$	37,070		$	36,841
Income taxes paid	14,304			7,275
Non-cash investing and financing activities:
Payable for repurchased shares	1,562			—
Property, plant and equipment accrued	21,934			38,650
Transfer of inventory to property, plant and equipment	—			11,369

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, 2014	60,672		$	607		$	(469	)	$	898,165		$	(19,556	)	$	596,892	$	1,475,639
Net income	—		—			—			—			—			37,632		37,632
Other comprehensive loss	—		—			—			—			(5,469		)	—		(5,469		)
Stock-based compensation	—		—			—			4,340			—			—		4,340
Issuance of restricted shares, net of shares remitted	89		1			—			(2,216		)	—			—		(2,215		)
Repurchases of common stock	(273	)	(3		)	—			(16,216		)	—			—		(16,219		)
Net tax benefit on exercise of stock-based awards	—		—			—			644			—			—		644
Employee stock purchase plan	91		1			—			4,363			—			—		4,364
Balance at June 30, 2014	60,579		$	606		$	(469	)	$	889,080		$	(25,025	)	$	634,524	$	1,498,716

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, 2013.

Reclassifications

During the second quarter of 2014, the Company made changes to the manner in which it manages its business, makes operating decisions and assesses performance. These changes included the reassignment of certain departments among its operating segments consistent with management reporting changes as well as the identification of Lodging Services as an additional segment. Under the new structure, the Company's operations are managed in six reportable segments: Technical Services, Industrial and Field Services, Oil Re-refining and Recycling, SK Environmental Services, Lodging Services and Oil and Gas Field Services. The prior year segment information has been recast to conform to the current year presentation. See Note 17, “Segment Reporting.”    

(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, 2013. There have been no material changes in these policies or their application.

Recent Accounting Pronouncements

Standards implemented

On January 1, 2014, the Company adopted the Financial Accounting Standards Board (“FASB”) Accounting Standard Update (“ASU”) 2013-11 Income Taxes (Topic 740) - Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists. This standard provides guidance regarding when an unrecognized tax benefit should be classified as a reduction to a deferred tax asset or when it should be classified as a liability in the consolidated balance sheet. The adoption of ASU 2013-11 did not have an impact on the Company's consolidated balance sheets.

Standards 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. This new guidance is effective for annual reporting periods (including interim reporting periods within those periods) beginning after December 15, 2016.    

In April 2014, FASB issued ASU 2014-08, Presentation of Financial Statements (Topic 205) and Property, Plant, and Equipment (Topic 360). The amendments in ASU 2014-08 provide guidance for the recognition and disclosure of discontinued operations. ASU 2014-08 is effective for fiscal years, and interim periods within those years, beginning after December 15, 2014.

The Company is currently evaluating the impact that the above standards to be implemented will have on the Company's consolidated financial statements.

6

(3) BUSINESS COMBINATIONS

Evergreen

On September 13, 2013, the Company acquired 100% of the outstanding common shares of Evergreen Oil, Inc. (“Evergreen”) for a final purchase price of $56.3 million in cash, net of cash acquired. Evergreen, headquartered in Irvine, California, specializes in the recovery and re-refining of used oil. Evergreen owns and operates one of the only oil re-refining operations in the western United States and also offers other ancillary environmental services, including parts cleaning and containerized waste services, vacuum services and hazardous waste management services. The acquisition of Evergreen enables the Company to further penetrate the small quantity waste generator market and further expand its oil re-refining, oil recycling and waste treatment capabilities. Financial information and results of Evergreen have been recorded in our consolidated financial statements since acquisition and are primarily included in the Oil Re-refining and Recycling segment.

Management determined the purchase price allocations based on estimates of the fair values of all tangible and intangible assets acquired and liabilities assumed. The Company believes that such information provides a reasonable basis for estimating the fair values of assets acquired and liabilities assumed. As of June 30, 2014, the Company has finalized the purchase accounting for the acquisition of Evergreen, except for environmental liabilities and taxes. The impact of the purchase price measurement period adjustments and related tax impacts recorded in the current period was not material to the consolidated financial statements and accordingly, the effects have not been retrospectively applied.

The following table summarizes the recognized amounts of assets acquired and liabilities assumed at September 13, 2013 (in thousands):

	At acquisition date as reported at December 31, 2013			Measurement Period Adjustments			At acquisition date as reported at June 30, 2014
Inventories and supplies	$	1,089		$	—		$	1,089
Prepaid and other current assets	1,291			(273		)	1,018
Property, plant and equipment	40,563			—			40,563
Permits and other intangibles	17,100			—			17,100
Deferred tax assets, less current portion	2,368			(2,368		)	—
Other assets	3,607			(239		)	3,368
Current liabilities	(6,198		)	218			(5,980		)
Closure and post-closure liabilities	(659		)	—			(659		)
Remedial liabilities, less current portion	(2,103		)	463			(1,640		)
Deferred taxes, unrecognized tax benefits and other long-term liabilities	(1,139		)	(920		)	(2,059		)
Total identifiable net assets	55,919			(3,119		)	52,800
Goodwill	—			3,518			3,518
Total	$	55,919		$	399		$	56,318

2014 Acquisitions

On May 30, 2014 the Company acquired certain assets of a privately owned U.S. company which provides carbon treatment systems and rental remediation equipment for approximately $6.2 million in cash. The purchase price is subject to customary post-closing adjustments based upon finalized working capital amounts. The acquired company has been integrated into the Technical Services segment.

(4) MARKETABLE SECURITIES

The Company classifies its marketable securities as available-for-sale and, accordingly, carries such securities at fair value based upon readily available quoted market prices of the securities. Unrealized gains and losses are reported, net of tax, as a component of other comprehensive income. On June 30, 2014 the Company did not hold any marketable securities. On December 31, 2013, marketable securities held by the Company were recorded at $12.4 million. Marketable securities were classified as Level 1 in the fair value hierarchy.

During the three and six months ended June 30, 2014 the Company sold marketable securities and recognized a gain of $0.1 million and $3.4 million, respectively, recorded as other income in the consolidated statement of income. There were no realized gains or losses from the sale of marketable securities in the three and six months ended June 30, 2013.

7

(5) INVENTORIES AND SUPPLIES

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

	June 30, 2014		December 31, 2013
Oil and oil products	$	62,563	$	59,639
Supplies and drums	72,172		64,471
Solvent and solutions	9,639		10,100
Other	17,418		17,886
Total inventories and supplies	$	161,792	$	152,096

(6) PROPERTY, PLANT AND EQUIPMENT

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

	June 30, 2014		December 31, 2013
Land	$	100,194	$	99,794
Asset retirement costs (non-landfill)	10,936		10,938
Landfill assets	105,569		100,983
Buildings and improvements	333,930		327,956
Camp equipment	186,622		187,831
Vehicles	459,594		425,296
Equipment	1,272,036		1,201,296
Furniture and fixtures	5,471		5,260
Construction in progress	64,259		58,010
	2,538,611		2,417,364
Less - accumulated depreciation and amortization	927,313		815,194
Total property, plant and equipment, net	$	1,611,298	$	1,602,170

(7) GOODWILL AND OTHER INTANGIBLE ASSETS

The changes to goodwill for the six months ended June 30, 2014 were as follows (in thousands):

	2014
Balance at January 1, 2014	$	570,960
Acquired from acquisitions	4,852
Increase from adjustments during the measurement period related to Evergreen	3,518
Foreign currency translation	(356		)
Balance at June 30, 2014	$	578,974

The Company assesses goodwill for impairment on an annual basis as of December 31, or 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, 2013 and determined that no adjustment to the carrying value of goodwill for any reporting unit was necessary because the fair values of the reporting units exceeded their respective carrying values.

The fair value of the Oil Re-refining and Recycling reporting unit exceeded the carrying value by less than 10% at December 31, 2013. During the first six months of fiscal 2014 the reporting unit has experienced lower than anticipated financial results primarily due to lower sales mix between base oils and higher priced blended oils as well as higher utilities and shutdown related costs. The lower sales prices reflected general economic conditions in the oil industry during the period. The financial performance of this reporting unit, which had a goodwill balance of approximately $174.7 million at June 30, 2014, is affected by fluctuations in oil prices overall market supply of refined oil and sales mix.

The fair value of the Oil and Gas Field Services reporting unit exceeded its carrying value by more than 10% at December 31, 2013. The financial performance of this reporting unit, which had a goodwill balance of approximately $36.4 million at June 30, 2014, was affected in the six months ended June 30, 2014 by pricing pressures and lower levels of overall activity in the markets and regions that the business serves.

8

Significant judgments are inherent in the annual impairment tests performed and include assumptions about the amount and timing of expected future cash flows, growth rates, and the determination of appropriate discount rates. The Company believes that the assumptions used in its annual impairment analysis are reasonable, but variations in any of the assumptions may result in different calculations of fair values that could result in a material impairment charge. The annual impairment tests performed as of December 31, 2013 utilized future annual budgeted amounts and discount rate assumptions based on an assessment of the Company's weighted average cost of capital as well as other significant assumptions believed to be reasonable at that time.

During the interim periods of fiscal year 2014 and with respect to the Oil Re-Refining and Recycling and Oil and Gas Field Services reporting units, the Company has considered whether (i) the lower than anticipated results (ii) general economic and industry conditions, and (iii) reporting unit specific factors would more likely than not reduce the estimated fair values of its reporting units below their carrying values. The Company has not performed an interim test for impairment of goodwill for any of its reporting units as it does not believe the factors impacting the performance of the reporting units through June 30, 2014 would more likely than not reduce the fair value below carrying value.

The performance of the Oil Re-Refining and Recycling and Oil and Gas Field Services reporting units will continue to be monitored. If these reporting units do not achieve the financial performance that the Company expects, it is possible that a goodwill impairment charge may result. There can be no assurance that future events will not result in an impairment of goodwill.

Below is a summary of amortizable other intangible assets (in thousands):

	June 30, 2014							December 31, 2013
	Cost		Accumulated Amortization		Net		Weighted Average Remaining Amortization Period (in years)	Cost		Accumulated Amortization		Net		Weighted Average Remaining Amortization Period (in years)
Permits	$	158,633	$	53,278	$	105,355	19.9	$	157,327	$	50,858	$	106,469	19.6
Customer and supplier relationships	377,686		66,925		310,761		11.4	377,899		52,814		325,085		12.1
Other intangible assets	30,787		17,842		12,945		3.1	29,299		15,518		13,781		3.3
Total amortizable permits and other intangible assets	567,106		138,045		429,061		11.7	564,525		119,190		445,335		12.2
Trademarks and trade names	124,597		—		124,597		Indefinite	124,638		—		124,638		Indefinite
Total permits and other intangible assets	$	691,703	$	138,045	$	553,658		$	689,163	$	119,190	$	569,973

Amortization expense for the three and six months ended June 30, 2014 was $8.9 million and $18.4 million, respectively. Amortization expense for the three and six months ended June 30, 2013 was $8.8 million and $17.1 million, respectively.

Below is the expected future amortization of the net carrying amount of finite lived intangible assets at June 30, 2014 (in thousands):

Years Ending December 31,	Expected Amortization
2014 (six months)	$	17,932
2015	35,607
2016	34,789
2017	32,743
2018	30,038
Thereafter	277,952
	$	429,061

9

(8) ACCRUED EXPENSES

Accrued expenses consisted of the following (in thousands):

	June 30, 2014		December 31, 2013
Insurance	$	62,969	$	57,993
Interest	20,666		20,731
Accrued compensation and benefits	62,032		60,902
Income, real estate, sales and other taxes	46,838		38,938
Other	52,863		58,265
Total accrued expenses	$	245,368	$	236,829

(9) CLOSURE AND POST-CLOSURE LIABILITIES

The changes to closure and post-closure liabilities (also referred to as “asset retirement obligations”) for the six months ended June 30, 2014 were as follows (in thousands):

	Landfill Retirement Liability			Non-Landfill Retirement Liability			Total
Balance at January 1, 2014	$	27,604		$	19,481		$	47,085
New asset retirement obligations	1,914			—			1,914
Accretion	1,278			921			2,199
Changes in estimates recorded to statement of income	(142		)	238			96
Changes in estimates recorded to balance sheet	363			—			363
Expenditures	(1,322		)	(444		)	(1,766		)
Currency translation and other	1			(10		)	(9		)
Balance at June 30, 2014	$	29,696		$	20,186		$	49,882

All of the landfill facilities included in the above were active as of June 30, 2014. New asset retirement obligations incurred during the first six months of 2014 were discounted at the credit-adjusted risk-free rate of 6.54%. There were no significant charges (benefits) in 2014 resulting from changes in estimates for closure and post-closure liabilities.

(10) REMEDIAL LIABILITIES

The changes to remedial liabilities for the six months ended June 30, 2014 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, 2014	$	5,624		$	74,262		$	92,612		$	172,498
Adjustments during the measurement period related to Evergreen	—			—			(518		)	(518		)
Accretion	133			1,534			1,467			3,134
Changes in estimates recorded to statement of income	(126		)	(2,467		)	1,068			(1,525		)
Expenditures	(57		)	(2,489		)	(3,131		)	(5,677		)
Currency translation and other	(10		)	7			(82		)	(85		)
Balance at June 30, 2014	$	5,564		$	70,847		$	91,416		$	167,827

In the six months ended June 30, 2014, the reduction in changes in estimates recorded to the statement of income was $1.5 million and primarily related to estimated cost adjustments for remediation across various sites.

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(11) FINANCING ARRANGEMENTS

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

	June 30, 2014		December 31, 2013
Senior unsecured notes, at 5.25%, due August 1, 2020	$	800,000	$	800,000
Senior unsecured notes, at 5.125%, due June 1, 2021	595,000		600,000
Long-term obligations	$	1,395,000	$	1,400,000

On July 30, 2012, the Company issued through a private placement $800.0 million aggregate principal amount of 5.25% senior unsecured notes due August 1, 2020 ("2020 Notes") with semi-annually fixed interest payments on February 1 and August 1 of each year, which commenced on February 1, 2013. At June 30, 2014 and December 31, 2013, the fair value of the Company's 2020 Notes was $806.5 million and $804.2 million, respectively, based on quoted market prices for the instrument and accrued interest. The fair value of the 2020 Notes is considered a Level 2 measure according to the fair value hierarchy.

On December 7, 2012, the Company issued through a private placement $600.0 million aggregate principal amount of 5.125% senior unsecured notes due 2021 ("2021 Notes") with semi-annually fixed interest payments on June 1 and December 1 of each year, which commenced on June 1, 2013. At June 30, 2014 and December 31, 2013, the fair value of the Company's 2021 Notes was $607.3 million and $601.6 million, respectively, based on quoted market prices for the instrument and accrued interest. The fair value of the 2021 Notes is considered a Level 2 measure according to the fair value hierarchy.

The Company also maintains a revolving credit facility which as of June 30, 2014 and December 31, 2013 had no outstanding loan balances. At June 30, 2014, $287.8 million was available to borrow and outstanding letters of credit were $112.2 million. At December 31, 2013, $259.7 million was available to borrow and outstanding letters of credit were $140.3 million.    

(12) INCOME TAXES

The Company’s effective tax rate for the three and six months ended June 30, 2014 was 39.1% and 38.9%, respectively, compared to 35.1% and 34.2% for the same period in 2013.

As of June 30, 2014 and December 31, 2013, the Company had recorded $1.3 million of liabilities for unrecognized tax benefits and $0.2 million of interest, respectively.

Due to expiring statute of limitation periods, the Company believes that total unrecognized tax benefits will decrease by approximately $0.1 million within the next twelve months. 

(13) EARNINGS PER SHARE

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

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2014		2013		2014		2013
Numerator for basic and diluted earnings per share:
Net income	$	28,672	$	22,902	$	37,632	$	33,404
Denominator:
Basic shares outstanding	60,665		60,550		60,695		60,507
Dilutive effect of equity-based compensation awards	113		137		127		151
Dilutive shares outstanding	60,778		60,687		60,822		60,658
Basic earnings per share:	$	0.47	$	0.38	$	0.62	$	0.55
Diluted earnings per share:	$	0.47	$	0.38	$	0.62	$	0.55

For the three and six months ended June 30, 2014, the dilutive effect of all then outstanding options, restricted stock and performance awards is included in the EPS calculations above except for 228,000 of outstanding performance stock awards for which the performance criteria were not attained at that time and 5,270 restricted stock awards which were antidilutive at June 30, 2014. For the three and six months ended June 30, 2013, the EPS calculations above include the dilutive effects of all then outstanding options,

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restricted stock, and performance awards except for 171,000 of outstanding performance stock awards for which the performance criteria were not attained at that time.

(14) ACCUMULATED OTHER COMPREHENSIVE LOSS

The changes in accumulated other comprehensive loss by component and related tax effects for the six months ended June 30, 2014 were as follows (in thousands):    

	Foreign Currency Translation			Unrealized (Losses) Gains on Available-For-Sale Securities			Unfunded Pension Liability			Total
Balance at January 1, 2014	$	(20,164	)	$	1,904		$	(1,296	)	$	(19,556	)
Other comprehensive (loss) gain before reclassifications	(3,411		)	940			—			(2,471		)
Amounts reclassified out of accumulated other comprehensive loss	—			(3,361		)	—			(3,361		)
Tax effects	—			363			—			363
Other comprehensive loss	$	(3,411	)	$	(2,058	)	$	—		$	(5,469	)
Balance at June 30, 2014	$	(23,575	)	$	(154	)	$	(1,296	)	$	(25,025	)

The amounts reclassified out of accumulated other comprehensive loss into the consolidated statement of income, with presentation location during the six months ended June 30, 2014 were as follows (in thousands):

	For the Three Months Ended		For the Six Months Ended
Comprehensive Loss Components	June 30, 2014		June 30, 2014		Location
Unrealized gains on available-for-sale investments	$	53	$	3,361	Other (expense) income

There were no reclassifications out of accumulated other comprehensive loss into the consolidated statement of income during the three and six months ended June 30, 2013.

(15) STOCK-BASED COMPENSATION

Stock Option Awards

The following table summarizes the total number and type of awards granted during the three and six months ended June 30, 2014, as well as the related weighted-average grant-date fair values:

	Three Months Ended			Six Months Ended
	June 30, 2014			June 30, 2014
	Shares	Weighted Average Grant-Date Fair Value		Shares	Weighted Average Grant-Date Fair Value
Restricted stock awards	103,130	$	61.85	107,630	$	61.55
Performance stock awards	130,107	$	62.20	130,107	$	62.20
Total awards	233,237			237,737

Restricted stock awards issued during the three and six months ended June 30, 2014 carry terms which are consistent with historical grants. For the performance stock awards granted during the three and six months ended June 30, 2014, the Compensation Committee of the Company's Board of Directors established two-year performance targets which could potentially be achieved in either 2014 or 2015.

Common Stock Repurchases

On February 25, 2014, the Company's Board of Directors authorized the repurchase of up to $150 million of the Company's common stock. As of June 30, 2014, we had repurchased and retired a total of approximately 273,000 shares of our common stock for approximately $16.2 million under this program. As of June 30, 2014, an additional $133.8 million remains available for repurchase of shares under the current authorized program.

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(16) COMMITMENTS AND CONTINGENCIES

Legal and Administrative Proceedings

The Company and its subsidiaries are subject to legal proceedings and claims arising in the ordinary course of business. Actions filed against the Company arise from commercial and employment-related claims including alleged class actions related to sales practices and wage and hour claims. The plaintiffs in these actions may be seeking damages or injunctive relief or both. These actions are in various jurisdictions and stages of proceedings, and some are covered in part by insurance. In addition, the Company’s waste management services operations are regulated by federal, state, provincial and local laws enacted to regulate discharge of materials into the environment, remediation of contaminated soil and groundwater or otherwise protect the environment. This ongoing regulation results in the Company frequently becoming a party to legal or administrative proceedings involving all levels of governmental authorities and other interested parties. The issues involved in such proceedings generally relate to alleged violations of existing permits and licenses or alleged responsibility under federal or state Superfund laws to remediate contamination at properties owned either by the Company or by other parties (“third party sites”) to which either the Company or the prior owners of certain of the Company’s facilities shipped wastes.

At June 30, 2014 and December 31, 2013, the Company had recorded reserves of $44.4 million and $41.7 million, respectively, in the Company's financial statements for actual or probable liabilities related to the legal and administrative proceedings in which the Company was then involved, the principal of which are described below. At June 30, 2014 and December 31, 2013, the Company also believed that it was reasonably possible that the amount of these potential liabilities could be as much as $3.5 million more. The Company periodically adjusts the aggregate amount of these reserves when actual or probable liabilities are paid or otherwise discharged, new claims arise, or additional relevant information about existing or probable claims becomes available. As of June 30, 2014, the $44.4 million of reserves consisted of (i) $35.2 million related to pending legal or administrative proceedings, including Superfund liabilities, which were included in remedial liabilities on the consolidated balance sheets, and (ii) $9.2 million primarily related to federal, state and provincial enforcement actions, which were included in accrued expenses on the consolidated balance sheets.

As of June 30, 2014, the principal legal and administrative proceedings in which the Company was involved, or which had been terminated during 2014, 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 that are scheduled to be heard in September of 2014. 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 Mercier Subsidiary continues to assert that it has no responsibility for the groundwater contamination in the region and will contest any action by the Ministry to impose costs for remedial measures on the Mercier Subsidiary. The Company also continues to pursue settlement options. At June 30, 2014 and December 31, 2013, the Company had accrued $13.9 million and $13.6 million, respectively, for remedial liabilities relating to the Ville Mercier legal proceedings.

Safety-Kleen Legal Proceedings. On December 28, 2012, the Company acquired Safety-Kleen and thereby became subject to the legal proceedings in which Safety-Kleen was a party on that date. In addition to certain Superfund proceedings in which Safety-Kleen has been named as a potentially responsible party as described below under “Superfund Proceedings,” the principal such legal proceedings involving Safety-Kleen which were outstanding as of June 30, 2014 were as follows:

Product Liability Cases. Safety-Kleen is named as a defendant in various lawsuits that are currently pending in various courts and jurisdictions throughout the United States, including approximately 64 proceedings (excluding cases which have been settled but not formally dismissed) as of June 30, 2014, 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

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remove the contaminants that become entrained in the solvent during their use. In addition, certain claimants assert that Safety-Kleen failed to warn adequately the product user of potential risks, including an historic failure to warn that solvent contains trace amounts of toxic or hazardous substances such as benzene. Safety-Kleen maintains insurance that it believes will provide coverage for these claims (over amounts accrued for self-insured retentions and deductibles in certain limited cases), except for punitive damages to the extent not insurable under state law or excluded from insurance coverage. Safety-Kleen believes that these claims lack merit and has historically vigorously defended, and intends to continue to vigorously defend, itself and the safety of its products against all of these claims. Such matters are subject to many uncertainties and outcomes are not predictable with assurance. Consequently, Safety-Kleen is unable to ascertain the ultimate aggregate amount of monetary liability or financial impact with respect to these matters as of June 30, 2014. From December 31, 2013 to June 30, 2014, eight 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.    

Fee Class Action Claims. In October 2010, two customers filed a complaint, individually and on behalf of all similarly situated customers in the State of Alabama, alleging that Safety-Kleen improperly assessed fuel surcharges and extended area service fees. In 2012, similar lawsuits were filed by the same law firm in California and Missouri. It is Safety-Kleen's position that it had the right to assess fuel surcharges, that the customers were contractually obligated or otherwise consented to the charges and that the surcharges were voluntarily paid by the customers when presented with an invoice. A class has not been certified in any of these cases, and no reserve has been recorded.

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 125 sites which are subject to or are proposed to become subject to proceedings under federal or state Superfund laws. Of the 125 sites, two (the Wichita Facility and the BR Facility described below) involve facilities that are now owned by the Company and 123 involve third party sites to which either the Company or the prior owners of certain of the Company’s facilities shipped wastes. Of the 123 third party sites, 29 are now settled, 20 are currently requiring expenditures on remediation and 74 are not currently requiring expenditures on remediation.

In connection with each site, the Company has estimated the extent, if any, to which it may be subject, either directly or as a result of any indemnification obligations, for cleanup and remediation costs, related legal and consulting costs associated with PRP investigations, settlements, and related legal and administrative proceedings. The amount of such actual and potential liability is inherently difficult to estimate because of, among other relevant factors, uncertainties as to the legal liability (if any) of the Company or the prior owners of certain of the Company's facilities to contribute a portion of the cleanup costs, the assumptions that must be made in calculating the estimated cost and timing of remediation, the identification of other PRPs and their respective capability and obligation to contribute to remediation efforts, and the existence and legal standing of indemnification agreements (if any) with prior owners, which may either benefit the Company or subject the Company to potential indemnification obligations. In addition to the Wichita Property and the BR Facility, Clean Harbors believes its potential liability could exceed $100,000 at 15 of the 123 third party sites.

Wichita Property.    The Company acquired in 2002 as part of the CSD assets a service center located in Wichita, Kansas (the "Wichita Property"). The Wichita Property is one of several properties located within the boundaries of a 1,400 acre state-designated Superfund site in an old industrial section of Wichita known as the North Industrial Corridor Site. Along with numerous other PRPs, the former owner executed a consent decree relating to such site with the U.S. Environmental Protection Agency (the "EPA"), and the Company is continuing an ongoing remediation program for the Wichita Property in accordance with that consent decree. The Company also acquired rights under an indemnification agreement between the former owner and an earlier owner of the Wichita Property which the Company anticipates but cannot guarantee will be available to reimburse certain such cleanup costs.

BR Facility.    The Company acquired in 2002 a former hazardous waste incinerator and landfill in Baton Rouge (the "BR Facility"), for which operations had been previously discontinued by the prior owner. In September 2007, the EPA issued a special notice letter to the Company related to the Devil's Swamp Lake Site ("Devil's Swamp") in East Baton Rouge Parish, Louisiana. Devil's Swamp includes a lake located downstream of an outfall ditch where wastewater and stormwater have been discharged, and Devil's Swamp is proposed to be included on the National Priorities List due to the presence of Contaminants of Concern ("COC") cited by the EPA. These COCs include substances of the kind found in wastewater and storm water discharged from the BR Facility in past operations. The EPA originally requested COC generators to submit a good faith offer to conduct a remedial investigation feasibility study directed towards the eventual remediation of the site. The Company is currently performing corrective actions at the BR Facility under an order issued by the Louisiana Department of Environmental Quality (the "LDEQ"), and has begun conducting

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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 123 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 five 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 16 sites for waste disposed prior to the Company's (or Safety-Kleen's) acquisition of the former subsidiaries of Waste Management or McKesson which had shipped wastes to those sites. Accordingly, Waste Management or McKesson are paying all costs of defending those subsidiaries in those 16 cases, including legal fees and settlement costs. However, there can be no guarantee that the Company's ultimate liabilities for those sites will not exceed the amount recorded or that indemnities applicable to any of these sites will be available to pay all or a portion of related costs. Except for the indemnification agreements which the Company holds from ChemWaste and McKesson, the Company does not have an indemnity agreement with respect to any of the 123 third party sites discussed above.

Federal, State and Provincial Enforcement Actions

From time to time, the Company pays fines or penalties in regulatory proceedings relating primarily to waste treatment, storage or disposal facilities. As of June 30, 2014 and December 31, 2013, there were three and five proceedings, respectively, for which the Company reasonably believed that the sanctions could equal or exceed $100,000. The Company believes that the fines or other penalties in these or any of the other regulatory proceedings will, individually or in the aggregate, not have a material effect on its financial condition, results of operations or cash flows.

(17) SEGMENT REPORTING

During the second quarter of 2014, the Company made changes to the manner in which it manages its business, makes operating decisions and assesses performance. These changes included the reassignment of certain departments among its operating segments consistent with management reporting changes as well as the identification of Lodging Services as an additional segment. Under the new structure, the Company's operations are managed in six reportable segments based primarily upon the nature of the various operations and services provided: Technical Services, Industrial and Field Services which consists of the Industrial Services and Field Services operating segments, Oil Re-refining and Recycling, SK Environmental Services, Lodging Services and Oil and Gas Field Services. The prior year segment information has been recast to conform to the current year presentation.

The following table reconciles third party revenues to direct revenues for the three and six months ended June 30, 2014 and 2013 (in thousands):

	For the Three Months Ended June 30, 2014											For the Six Months Ended June 30, 2014
	Third party revenues		Intersegment revenues, net			Corporate Items, net			Direct revenues			Third party revenues		Intersegment revenues, net			Corporate Items, net			Direct revenues
Technical Services	$	256,798	$	40,082		$	778		$	297,658		$	493,579	$	77,516		$	1,177		$	572,272
Industrial and Field Services	185,154		(11,047		)	36			174,143			347,114		(22,805		)	191			324,500
Oil Re-refining and Recycling	144,016		(54,861		)	(5		)	89,150			272,937		(102,977		)	(5		)	169,955
SK Environmental Services	171,324		23,307			—			194,631			332,712		43,264			(58		)	375,918
Lodging Services	42,872		900			25			43,797			99,566		1,294			26			100,886
Oil and Gas Field Services	58,177		1,619			(22		)	59,774			158,949		3,708			(10		)	162,647
Corporate Items	139		—			(812		)	(673		)	290		—			(1,321		)	(1,031		)
Total	$	858,480	$	—		$	—		$	858,480		$	1,705,147	$	—		$	—		$	1,705,147

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	For the Three Months Ended June 30, 2013											For the Six Months Ended June 30, 2013
	Third party revenues		Intersegment revenues, net			Corporate Items, net			Direct revenues			Third party revenues			Intersegment revenues, net			Corporate Items, net			Direct revenues
Technical Services	$	256,262	$	25,789		$	1,339		$	283,390		$	490,201		$	50,208		$	2,191		$	542,600
Industrial and Field Services	199,225		(12,680		)	(128		)	186,417			368,846			(26,440		)	(106		)	342,300
Oil Re-refining and Recycling	123,008		(48,261		)	—			74,747			263,092			(98,287		)	—			164,805
SK Environmental Services	166,523		32,207			—			198,730			326,325			67,077			84			393,486
Lodging Services	46,685		1,207			101			47,993			100,015			1,809			217			102,041
Oil and Gas Field Services	68,444		1,738			(49		)	70,133			183,607			5,633			(200		)	189,040
Corporate Items	381		—			(1,263		)	(882		)	(9,395		)	—			(2,186		)	(11,581		)
Total	$	860,528	$	—		$	—		$	860,528		$	1,722,691		$	—		$	—		$	1,722,691

Third party revenue is revenue billed to outside customers by a particular segment. Direct revenue is revenue allocated to the segment performing the provided service. Intersegment revenues represent the sharing of third party revenues among the segments based on products and services provided by each segment as if the products and services were sold directly to the third party. The intersegment revenues are shown net. The negative intersegment revenues are due to more transfers out of customer revenues to other segments than transfers in of customer revenues from other segments. The operations not managed through the Company’s six reportable segments are recorded as “Corporate Items.” Corporate Items revenues consist of two different operations for which the revenues are insignificant. Corporate Items cost of revenues represents certain central services that are not allocated to the six segments for internal reporting purposes. Corporate Items selling, general and administrative expenses include typical corporate items such as legal, accounting and other items of a general corporate nature that are not allocated to the Company’s six reportable segments. Performance of the segments is evaluated on several factors, of which the primary financial measure is “Adjusted EBITDA,” which consists of net income plus accretion of environmental liabilities, depreciation and amortization, net interest expense, provision for income taxes and pre-tax, non-cash acquisition accounting adjustments. Also excluded is other income as it is not considered part of usual business operations. Transactions between the segments are accounted for at the Company’s estimate based on similar transactions with outside customers. 

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The following table presents Adjusted EBITDA information used by management for each reportable segment (in thousands). The Company does not allocate interest expense, income taxes, depreciation, amortization, accretion of environmental liabilities, pre-tax, non-cash acquisition accounting inventory adjustment, and other expense (income) to its segments.    

	For the Three Months Ended						For the Six Months Ended
	June 30,						June 30,
	2014			2013			2014			2013
Adjusted EBITDA:
Technical Services	$	84,297		$	69,390		$	146,474		$	129,435
Industrial and Field Services	30,716			34,760			47,088			48,572
Oil Re-refining and Recycling	15,196			12,752			27,779			28,098
SK Environmental Services	31,307			34,076			54,132			61,082
Lodging Services	15,487			19,259			33,224			41,560
Oil and Gas Field Services	1,812			4,144			18,143			31,928
Corporate Items	(43,016		)	(50,791		)	(89,055		)	(105,857		)
Total	$	135,799		$	123,590		$	237,785		$	234,818
Reconciliation to Consolidated Statements of Income:
Pre-tax, non-cash acquisition accounting inventory adjustment	—			—			—			13,559
Accretion of environmental liabilities	2,609			2,879			5,333			5,714
Depreciation and amortization	66,075			67,468			135,431			127,474
Income from operations	67,115			53,243			97,021			88,071
Other expense (income)	655			(1,655		)	(3,523		)	(2,180		)
Interest expense, net of interest income	19,382			19,585			38,936			39,458
Income before provision for income taxes	$	47,078		$	35,313		$	61,608		$	50,793

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

	June 30, 2014
	Technical Services		Industrial and Field Services		Oil Re-refining and Recycling		SK Environmental Services		Lodging Services		Oil and Gas Field Services		Corporate Items		Totals
Property, plant and equipment, net	$	408,977	$	260,083	$	208,630	$	245,513	$	156,730	$	229,017	$	102,348	$	1,611,298
Goodwill	50,432		109,785		174,739		172,223		35,395		36,400		—		578,974
Permits and other intangible, net	78,669		19,747		156,882		259,691		12,936		25,733		—		553,658
Total assets	$	751,444	$	416,912	$	670,797	$	742,795	$	237,671	$	390,314	$	722,510	$	3,932,443

	December 31, 2013
	Technical Services		Industrial and Field Services		Oil Re-refining and Recycling		SK Environmental Services		Lodging Services		Oil and Gas Field Services		Corporate Items		Totals
Property, plant and equipment, net	$	400,544	$	251,826	$	211,458	$	239,650	$	166,252	$	224,585	$	107,855	$	1,602,170
Goodwill	45,599		109,873		171,161		172,309		35,512		36,506		—		570,960
Permits and other intangible, net	80,302		21,147		160,807		265,106		14,730		27,881		—		569,973
Total assets	$	699,675	$	410,233	$	642,901	$	774,756	$	239,056	$	381,057	$	806,000	$	3,953,678

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

	June 30, 2014		December 31, 2013
United States	$	2,695,931	$	2,684,686
Canada	1,233,547		1,266,505
Other foreign	2,965		2,487
Total	$	3,932,443	$	3,953,678

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(18) GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION

The 2020 Notes and 2021 Notes are guaranteed by substantially all of the Company's subsidiaries organized in the United States. Each guarantor for the 2020 Notes and 2021 Notes is a 100% owned subsidiary of the Company and its guarantee is both full and unconditional and joint and several.  The 2020 Notes and 2021 Notes are not guaranteed by the Company’s Canadian or other foreign subsidiaries. The following presents supplemental condensed consolidating financial information for the parent company, the guarantor subsidiaries and the non-guarantor subsidiaries, respectively.

Following is the condensed consolidating balance sheet at June 30, 2014 (in thousands):

	Clean Harbors, Inc.		U.S. Guarantor Subsidiaries		Foreign Non-Guarantor Subsidiaries		Consolidating Adjustments			Total
Assets:
Cash and cash equivalents	$	1,006	$	193,821	$	83,817	$	—		$	278,644
Intercompany receivables	237,556		2,446		84,029		(324,031		)	—
Accounts receivable, net	—		399,423		175,764					575,187
Other current assets	24,087		194,211		78,162		—			296,460
Property, plant and equipment, net	—		961,240		650,058		—			1,611,298
Investments in subsidiaries	2,762,237		760,718		—		(3,522,955		)	—
Intercompany debt receivable	—		379,428		3,701		(383,129		)	—
Goodwill			424,057		154,917					578,974
Permits and other intangibles, net			447,638		106,020					553,658
Other long-term assets	25,457		3,759		9,006		—			38,222
Total assets	$	3,050,343	$	3,766,741	$	1,345,474	$	(4,230,115	)	$	3,932,443
Liabilities and Stockholders’ Equity:
Current liabilities	$	61,029	$	429,490	$	115,747	$	—		$	606,266
Intercompany payables	—		321,533		2,498		(324,031		)	—
Closure, post-closure and remedial liabilities, net	—		150,250		31,416		—			181,666
Long-term obligations	1,395,000		—		—		—			1,395,000
Capital lease obligations, net	—		129		698		—			827
Intercompany debt payable	3,701		—		379,428		(383,129		)	—
Other long-term liabilities	91,897		103,102		54,969		—			249,968
Total liabilities	1,551,627		1,004,504		584,756		(707,160		)	2,433,727
Stockholders’ equity	1,498,716		2,762,237		760,718		(3,522,955		)	1,498,716
Total liabilities and stockholders’ equity	$	3,050,343	$	3,766,741	$	1,345,474	$	(4,230,115	)	$	3,932,443

18

Following is the condensed consolidating balance sheet at December 31, 2013 (in thousands):

	Clean Harbors, Inc.		U.S. Guarantor Subsidiaries		Foreign Non-Guarantor Subsidiaries		Consolidating Adjustments			Total
Assets:
Cash and cash equivalents	$	1,006	$	235,445	$	73,622	$	—		$	310,073
Intercompany receivables	269,580		2,448		230,224		(502,252		)	—
Accounts receivables	—		387,006		192,388		—			579,394
Other current assets	24,087		182,881		74,744		—			281,712
Property, plant and equipment, net	—		945,280		656,890		—			1,602,170
Investments in subsidiaries	2,683,158		967,186		144,953		(3,795,297		)	—
Intercompany debt receivable	—		493,402		3,701		(497,103		)	—
Goodwill	—		415,541		155,419		—			570,960
Permits and other intangibles, net	—		458,917		111,056		—			569,973
Other long-term assets	23,770		7,018		8,608		—			39,396
Total assets	$	3,001,601	$	4,095,124	$	1,651,605	$	(4,794,652	)	$	3,953,678
Liabilities and Stockholders’ Equity:
Current liabilities	$	33,626	$	466,454	$	139,465	$	—		$	639,545
Intercompany payables	—		499,749		2,503		(502,252		)	—
Closure, post-closure and remedial liabilities, net	—		158,298		31,814		—			190,112
Long-term obligations	1,400,000		—		—		—			1,400,000
Capital lease obligations, net	—		191		1,244		—			1,435
Intercompany debt payable	3,701		—		493,402		(497,103		)	—
Other long-term liabilities	88,635		103,125		55,187		—			246,947
Total liabilities	1,525,962		1,227,817		723,615		(999,355		)	2,478,039
Stockholders’ equity	1,475,639		2,867,307		927,990		(3,795,297		)	1,475,639
Total liabilities and stockholders’ equity	$	3,001,601	$	4,095,124	$	1,651,605	$	(4,794,652	)	$	3,953,678

19

Following is the consolidating statement of income (loss) for the three months ended June 30, 2014 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues
Service revenues				$	476,268		$	194,579		$	(5,572	)	$	665,275
Product revenues				151,667			43,136			(1,598		)	193,205
Total revenues	—			627,935			237,715			(7,170		)	858,480
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues				317,861			133,468			(5,572		)	445,757
Product cost of revenues				118,560			44,231			(1,598		)	161,193
Total cost of revenues	—			436,421			177,699			(7,170		)	606,950
Selling, general and administrative expenses	25			82,513			33,193			—			115,731
Accretion of environmental liabilities	—			2,219			390			—			2,609
Depreciation and amortization	—			41,289			24,786			—			66,075
Income from operations	(25		)	65,493			1,647			—			67,115
Other income	—			(123		)	(532		)	—			(655		)
Interest (expense) income	(19,612		)	216			14			—			(19,382		)
Equity in earnings of subsidiaries	54,436			3,393			—			(57,829		)	—
Intercompany dividend income	—						3,138			(3,138		)	—
Intercompany interest income (expense)				9,497			(9,497		)				—
Income before provision for income taxes	34,799			78,476			(5,230		)	(60,967		)	47,078
Provision (benefit) for income taxes	6,127			13,586			(1,307		)				18,406
Net income (loss)	28,672			64,890			(3,923		)	(60,967		)	28,672
Other comprehensive income (loss)	36,056			36,056			(42,927		)	6,871			36,056
Comprehensive income (loss)	$	64,728		$	100,946		$	(46,850	)	$	(54,096	)	$	64,728

20

Following is the consolidating statement of (loss) income for the three months ended June 30, 2013 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues
Service revenues	$	—		$	497,731		$	171,019		$	5,122		$	673,872
Product revenues	—			89,740			95,465			1,451			186,656
Total revenues	—			587,471			266,484			6,573			860,528
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	—			341,768			108,713			5,122			455,603
Product cost of revenues	—			73,712			83,560			1,451			158,723
Total cost of revenues	—			415,480			192,273			6,573			614,326
Selling, general and administrative expenses	30			89,884			32,698			—			122,612
Accretion of environmental liabilities	—			2,437			442			—			2,879
Depreciation and amortization	—			44,220			23,248			—			67,468
Income from operations	(30		)	35,450			17,823			—			53,243
Other income (expense)	—			2,249			(594		)	—			1,655
Interest (expense) income	(19,764		)	—			179			—			(19,585		)
Equity in earnings of subsidiaries	45,106			14,563			—			(59,669		)	—
Intercompany dividend income	—			—			3,323			(3,323		)	—
Intercompany interest income (expense)	—			9,969			(9,969		)	—			—
Income before provision for income taxes	25,312			62,231			10,762			(62,992		)	35,313
Provision for income taxes	2,410			7,009			2,992			—			12,411
Net income	22,902			55,222			7,770			(62,992		)	22,902
Other comprehensive (loss) income	(35,506		)	(35,506		)	18,685			16,821			(35,506		)
Comprehensive (loss) income	$	(12,604	)	$	19,716		$	26,455		$	(46,171	)	$	(12,604	)

21

Following is the consolidating statement of income (loss) for the six months ended June 30, 2014 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues
Service revenues				$	920,142		$	413,584		$	(8,356	)	$	1,325,370
Product revenues				286,542			95,629			(2,394		)	379,777
Total revenues	—			1,206,684			509,213			(10,750		)	1,705,147
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues				622,502			298,410			(8,356		)	912,556
Product cost of revenues				233,488			89,019			(2,394		)	320,113
Total cost of revenues	—			855,990			387,429			(10,750		)	1,232,669
Selling, general and administrative expenses	56			170,066			64,571			—			234,693
Accretion of environmental liabilities				4,567			766						5,333
Depreciation and amortization				84,021			51,410			—			135,431
Income from operations	(56		)	92,040			5,037			—			97,021
Other income				786			2,737						3,523
Interest (expense) income	(39,346		)	446			(36		)				(38,936		)
Equity in earnings of subsidiaries	84,545			11,855						(96,400		)	—
Intercompany dividend income	—						6,238			(6,238		)	—
Intercompany interest income (expense)				18,881			(18,881		)				—
Income before provision for income taxes	45,143			124,008			(4,905		)	(102,638		)	61,608
Provision (benefit) for income taxes	7,511			17,691			(1,226		)				23,976
Net income (loss)	37,632			106,317			(3,679		)	(102,638		)	37,632
Other comprehensive loss	(5,469		)	(5,469		)	(23,245		)	28,714			(5,469		)
Comprehensive income (loss)	$	32,163		$	100,848		$	(26,924	)	$	(73,924	)	$	32,163

22

Following is the consolidating statement of (loss) income for the six months ended June 30, 2013 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues
Service revenues	$	—		$	896,966		$	452,438		$	(2,910	)	$	1,346,494
Product revenues	—			250,603			126,407			(813		)	376,197
Total revenues	—			1,147,569			578,845			(3,723		)	1,722,691
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	—			615,940			310,945			(2,910		)	923,975
Product cost of revenues	—			217,353			109,835			(813		)	326,375
Total cost of revenues	—			833,293			420,780			(3,723		)	1,250,350
Selling, general and administrative expenses	55			185,445			65,582			—			251,082
Accretion of environmental liabilities	—			4,837			877			—			5,714
Depreciation and amortization	—			81,509			45,965			—			127,474
Income from operations	(55		)	42,485			45,641			—			88,071
Other income (expense)	—			2,969			(789		)	—			2,180
Interest (expense) income	(39,564		)	—			106			—			(39,458		)
Equity in earnings of subsidiaries	75,327			35,976			—			(111,303		)	—
Intercompany dividend income	—			—			6,968			(6,968		)	—
Intercompany interest income (expense)	—			20,307			(20,307		)	—			—
Income before provision for income taxes	35,708			101,737			31,619			(118,271		)	50,793
Provision for income taxes	2,304			6,535			8,550			—			17,389
Net income	33,404			95,202			23,069			(118,271		)	33,404
Other comprehensive (loss) income	(59,367		)	(59,367		)	30,457			28,910			(59,367		)
Comprehensive (loss) income	$	(25,963	)	$	35,835		$	53,526		$	(89,361	)	$	(25,963	)

23

Following is the condensed consolidating statement of cash flows for the six months ended June 30, 2014 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Total
Net cash from operating activities	$	16,864		$	35,046		$	63,034		$	114,944
Cash flows from investing activities:
Additions to property, plant and equipment	—			(90,515		)	(47,671		)	(138,186		)
Proceeds from sales of fixed assets	—			1,015			1,971			2,986
Acquisitions, net of cash acquired	—			(6,150		)	—			(6,150		)
Costs to obtain or renew permits	—			(477		)	(2,414		)	(2,891		)
Proceeds from sales of marketable securities	—			—			12,947			12,947
Net cash used in investing activities	—			(96,127		)	(35,167		)	(131,294		)
Cash flows from financing activities:
Change in uncashed checks	—			4,595			(1,433		)	3,162
Proceeds from employee stock purchase plan	4,364			—			—			4,364
Remittance of shares, net	(2,215		)	—			—			(2,215		)
Repurchases of common stock	(14,657		)	—			—			(14,657		)
Excess tax benefit of stock-based compensation	644			—			—			644
Payments on capital leases	—			(87		)	(1,103		)	(1,190		)
Repayment of long-term obligations	(5,000		)	—			—			(5,000		)
Dividends (paid) / received	—			(7,412		)	7,412			—
Interest received / (payments)	—			22,361			(22,361		)	—
Net cash from financing activities	(16,864		)	19,457			(17,485		)	(14,892		)
Effect of exchange rate change on cash	—			—			(187		)	(187		)
(Decrease) increase in cash and cash equivalents	—			(41,624		)	10,195			(31,429		)
Cash and cash equivalents, beginning of period	1,006			235,445			73,622			310,073
Cash and cash equivalents, end of period	$	1,006		$	193,821		$	83,817		$	278,644

24

Following is the condensed consolidating statement of cash flows for the six months ended June 30, 2013 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Total
Net cash from operating activities	$	(36,459	)	$	84,226		$	89,845		$	137,612
Cash flows from investing activities:
Additions to property, plant and equipment	—			(62,818		)	(78,648		)	(141,466		)
Proceeds from sale of fixed assets	—			803			1,391			2,194
Acquisitions, net of cash acquired	—			—			—			—
Costs to obtain or renew permits	—			(212		)	(1,957		)	(2,169		)
Net cash used in investing activities	—			(62,227		)	(79,214		)	(141,441		)
Cash flows from financing activities:
Change in uncashed checks	—			37,118			3,238			40,356
Proceeds from exercise of stock options	399			—			—			399
Proceeds from employee stock purchase plan	3,391			—			—			3,391
Remittance of shares, net	(169		)	—			—			(169		)
Excess tax benefit of stock-based compensation	1,326			—			—			1,326
Deferred financing costs paid	(2,446		)	—			—			(2,446		)
Payments of capital leases	—			(164		)	(2,424		)	(2,588		)
Issuance costs related to 2012 issuance of common stock	(250		)	—			—			(250		)
Dividends (paid) / received	—			(6,989		)	6,989			—
Interest received / (payments)	—			21,780			(21,780		)	—
Net cash from financing activities	2,251			51,745			(13,977		)	40,019
Effect of exchange rate change on cash	—			—			(2,548		)	(2,548		)
(Decrease) increase in cash and cash equivalents	(34,208		)	73,744			(5,894		)	33,642
Cash and cash equivalents, beginning of period	35,214			140,683			53,939			229,836
Cash and cash equivalents, end of period	$	1,006		$	214,427		$	48,045		$	263,478

25

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 March 3, 2014, 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.

Highlights

Total revenues in the three and six months ended June 30, 2014 was $858.5 million and $1.71 billion, respectively, compared with $860.5 million and $1.72 billion in the three and six months ended June 30, 2013, respectively. These decreases in total revenues were primarily attributable to the effects of foreign currency translation which reduced revenue by approximately 2% in the three and six months ended June 30, 2014 from the comparable periods in 2013 partially offset by incremental revenues generated from the operations acquired as part of the September 2013 acquisition of Evergreen Oil, Inc. ("Evergreen"). Changes in segment revenues are more fully described in our Segment Performance section below under the heading "Direct Revenues." Income from operations in the three and six months ended June 30, 2014 was $67.1 million and $97.0 million, respectively, compared with $53.2 million and $88.1 million in the three and six months ended June 30, 2013, respectively. Increases in income from operations were primarily due to cost savings generated from corporate initiatives implemented in 2014 across several expense categories. Adjusted EBITDA for the three months ended June 30, 2014increased9.9% to $135.8 million from $123.6 million in the three months ended June 30, 2013 and increased1.3% to $237.8 million in the six months ended June 30, 2014 from $234.8 million in the six months ended June 30, 2013. Additional information, including a reconciliation of Adjusted EBITDA to Net Income, appears below under the heading "Adjusted EBITDA."

Acquisitions

On September 13, 2013, we acquired 100% of the outstanding common shares of Evergreen for a final purchase price of $56.3 million in cash, net of cash acquired. Evergreen, headquartered in Irvine, California, specializes in the recovery and re-refining of used oil. Evergreen owns and operates one of the only oil re-refining operations in the western United States and also offers other ancillary environmental services, including parts cleaning and containerized waste services, vacuum services and hazardous waste management services. The acquisition of Evergreen enables us to further penetrate the small quantity waste generator market and further expand its oil re-refining, oil recycling and waste treatment capabilities. Financial information and results of Evergreen have been recorded in our consolidated financial statements since acquisition and are primarily included in the Oil Re-refining and Recycling segment.

On May 30, 2014, the Company acquired certain assets of a privately owned U.S. company which provides carbon treatment systems and rental remediation equipment. The purchase price for the acquisition was $6.1 million and is subject to customary post-closing purchase price adjustments based upon finalized working capital amounts. The acquired company has been integrated into the Technical Services segment.

Environmental Liabilities

(in thousands)	June 30, 2014		December 31, 2013		$ Change			% Change
Closure and post-closure liabilities	$	49,882	$	47,085	$	2,797		5.9	%
Remedial liabilities	167,827		172,498		(4,671		)	(2.7	)%
Total environmental liabilities	$	217,709	$	219,583	$	(1,874	)	(0.9	)%

Total environmental liabilities as of June 30, 2014 were $217.7 million, a decrease of 0.9%, or $1.9 million, compared to December 31, 2013 primarily due to expenditures and changes in estimates recorded to the statement of income partially offset by accretion.

26

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.

In the six months ended June 30, 2014, the net reduction in our environmental liabilities from changes in estimates recorded as a benefit within the statement of income was $1.4 million and primarily related to estimated cost adjustments for remediation across various sites.

Segment data

During the second quarter of 2014, we made changes to the manner in which we manage our business, make operating decisions and assess performance. These changes included the reassignment of certain departments among our operating segments in line with management reporting changes as well as the identification of Lodging Services as an additional segment. Under the new structure, our operations are managed in six reportable segments: Technical Services, Industrial and Field Services, Oil Re-refining and Recycling, SK Environmental Services, Lodging Services and Oil and Gas Field Services. The following discussion and related prior year segment information has been recast to conform to the current year presentation.

Performance of our segments is evaluated on several factors of which the primary financial measure is Adjusted EBITDA. The following tables set forth certain operating data associated with our results of operations and summarize Adjusted EBITDA contribution by reportable segment for the three and six months ended June 30, 2014 and 2013 (in thousands).

27

	Summary of Operations (in thousands)
	For the Three Months Ended										For the Six Months Ended
	2014			2013			$ Change			% Change	2014			2013			$ Change			% Change
Third Party Revenues(1):
Technical Services	$	256,798		$	256,262		$	536		0.2%	$	493,579		$	490,201		$	3,378		0.7%
Industrial and Field Services	185,154			199,225			(14,071		)	(7.1)	347,114			368,846			(21,732		)	(5.9)
Oil Re-refining and Recycling	144,016			123,008			21,008			17.1	272,937			263,092			9,845			3.7
SK Environmental Services	171,324			166,523			4,801			2.9	332,712			326,325			6,387			2.0
Lodging Services	42,872			46,685			(3,813		)	(8.2)	99,566			100,015			(449		)	(0.4)
Oil and Gas Field Services	58,177			68,444			(10,267		)	(15.0)	158,949			183,607			(24,658		)	(13.4)
Corporate Items(2)	139			381			(242		)	(63.5)	290			(9,395		)	9,685			103.1
Total	$	858,480		$	860,528		$	(2,048	)	(0.2)%	$	1,705,147		$	1,722,691		$	(17,544	)	(1.0)%
Direct Revenues(1):
Technical Services	$	297,658		$	283,390		$	14,268		5.0%	$	572,272		$	542,600		$	29,672		5.5%
Industrial and Field Services	174,143			186,417			(12,274		)	(6.6)	324,500			342,300			(17,800		)	(5.2)
Oil Re-refining and Recycling	89,150			74,747			14,403			19.3	169,955			164,805			5,150			3.1
SK Environmental Services	194,631			198,730			(4,099		)	(2.1)	375,918			393,486			(17,568		)	(4.5)
Lodging Services	43,797			47,993			(4,196		)	(8.7)	100,886			102,041			(1,155		)	(1.1)
Oil and Gas Field Services	59,774			70,133			(10,359		)	(14.8)	162,647			189,040			(26,393		)	(14.0)
Corporate Items(2)	(673		)	(882		)	209			23.7	(1,031		)	(11,581		)	10,550			91.1
Total	858,480			860,528			(2,048		)	(0.2)	1,705,147			1,722,691			(17,544		)	(1.0)
Cost of Revenues(3):
Technical Services	191,875			192,072			(197		)	(0.1)	381,650			370,765			10,885			2.9
Industrial and Field Services	129,603			137,416			(7,813		)	(5.7)	249,167			264,594			(15,427		)	(5.8)
Oil Re-refining and Recycling	69,718			57,980			11,738			20.2	133,827			126,325			7,502			5.9
SK Environmental Services	137,199			137,801			(602		)	(0.4)	267,472			276,952			(9,480		)	(3.4)
Lodging Services	26,630			27,471			(841		)	(3.1)	64,563			57,852			6,711			11.6
Oil and Gas Field Services	51,286			59,609			(8,323		)	(14.0)	130,435			142,789			(12,354		)	(8.7)
Corporate Items(2)	639			1,977			(1,338		)	(67.7)	5,555			11,073			(5,518		)	(49.8)
Total	606,950			614,326			(7,376		)	(1.2)	1,232,669			1,250,350			(17,681		)	(1.4)
Selling, General & Administrative Expenses:
Technical Services	21,486			21,928			(442		)	(2.0)	44,148			42,400			1,748			4.1
Industrial and Field Services	13,824			14,241			(417		)	(2.9)	28,245			29,134			(889		)	(3.1)
Oil Re-refining and Recycling	4,236			4,015			221			5.5	8,349			10,382			(2,033		)	(19.6)
SK Environmental Services	26,125			26,853			(728		)	(2.7)	54,314			55,452			(1,138		)	(2.1)
Lodging Services	1,680			1,263			417			33.0	3,099			2,629			470			17.9
Oil and Gas Field Services	6,676			6,380			296			4.6	14,069			14,323			(254		)	(1.8)
Corporate Items	41,704			47,932			(6,228		)	(13.0)	82,469			96,762			(14,293		)	(14.8)
Total	115,731			122,612			(6,881		)	(5.6)	234,693			251,082			(16,389		)	(6.5)
Adjusted EBITDA:
Technical Services	84,297			69,390			14,907			21.5	146,474			129,435			17,039			13.2
Industrial and Field Services	30,716			34,760			(4,044		)	(11.6)	47,088			48,572			(1,484		)	(3.1)
Oil Re-refining and Recycling	15,196			12,752			2,444			19.2	27,779			28,098			(319		)	(1.1)
SK Environmental Services	31,307			34,076			(2,769		)	(8.1)	54,132			61,082			(6,950		)	(11.4)
Lodging Services	15,487			19,259			(3,772		)	(19.6)	33,224			41,560			(8,336		)	(20.1)
Oil and Gas Field Services	1,812			4,144			(2,332		)	(56.3)	18,143			31,928			(13,785		)	(43.2)
Corporate Items	(43,016		)	(50,791		)	7,775			(15.3)	(89,055		)	(105,857		)	16,802			(15.9)
Total	$	135,799		$	123,590		$	12,209		9.9%	$	237,785		$	234,818		$	2,967		1.3%

______________________

1. Third party revenue is revenue billed to outside customers by a particular segment. Direct revenue is revenue allocated to the segment performing the provided service.

2. Corporate Items revenues and costs of revenues for the six months ended June 30, 2013 includes purchase price measurement period adjustments.

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

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Direct Revenues

There are many factors which have impacted, and continue to impact, our revenues. These factors include, but are not limited to: foreign currency translation, acquisitions, the general conditions of the oil and gas industries, competitive industry pricing, the effects of fuel prices on our fuel recovery fees, and the level of emergency response projects.

Technical Services revenues increased$14.3 million and $29.7 million in the three and six months ended June 30, 2014 from the comparable periods in 2013 primarily due to growth in our treatment, storage and disposal network as a result of greater drum volumes and overall utilization. The utilization rate at our incinerators was 95.0% and 91.0% for the three and six months ended June 30, 2014, respectively, compared with 92.3% and 88.9% in the comparable period of 2013, and our landfill volumes increased by approximately 5.1% in six months ended June 30, 2014 from the comparable period in 2013.

Industrial and Field Services revenues decreased$12.3 million and $17.8 million in the three and six months ended June 30, 2014 from the comparable periods in 2013. The decrease was primarily due to decreased activity in the oil sands region, cyclicality of scheduled plant turnarounds and the effects of foreign currency translation.

Oil Re-refining and Recycling revenues increased$14.4 million, in the three months ended June 30, 2014 from the comparable period in 2013. The increase was primarily due to increased volumes resulting from our acquisition of Evergreen on September 13, 2013. Oil Re-refining and Recycling revenues increased$5.2 million, in the six months ended June 30, 2014 from the comparable period in 2013 also primarily due to increased volumes resulting from of our acquisition of Evergreen partially offset by lower sales mix between base oils and higher priced blended oils. In addition, revenues were negatively impacted as compared to the three and six months ended June 30, 2013 by the effects of foreign currency translation.

SK Environmental Services revenues decreased$4.1 million and $17.6 million in the three and six months ended June 30, 2014 from the comparable periods in 2013 primarily due to system integration changes which occurred in May of 2013 and changed the manner by which waste is tracked across the Company’s disposal network and lower refined fuel oil sales period over period.

Lodging Services revenues decreased$4.2 million and $1.2 million in the three and six months ended June 30, 2014 from the comparable periods in 2013 primarily due to lower occupancy at our lodging and camp facilities due to an overall slowdown in the levels of activity in the Oil Sands region of Canada and the effects of foreign currency translation.

Oil and Gas Field Services revenues decreased$10.4 million and $26.4 million in the three and six months ended June 30, 2014 from the comparable periods in 2013 primarily due to project delays in exploration, pricing pressure in North America and the effects of foreign currency translation.

Corporate Items revenues during the six months ended June 30, 2013 included the impact of purchase accounting adjustments to deferred revenue balances that did not reoccur in 2014.

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 waste treatment services through the development of new technology and continued modifications at our facilities, and implementation of strategic sourcing initiatives.

Technical Services cost of revenues was flat in the three months ended June 30, 2014 from the comparable period in 2013. Technical Services cost of revenues increased$10.9 million, in the six months ended June 30, 2014 from the comparable period in 2013 primarily due to increases in materials and supplies, outside transportation and utilities. Profit margins have improved due to overall mix of waste handled and greater operating efficiencies.

Industrial and Field Services cost of revenues decreased$7.8 million and $15.4 million in the three and six months ended June 30, 2014 from the comparable periods in 2013 primarily due to decreased revenues in both periods.

Oil Re-refining and Recycling cost of revenues increased$11.7 million and $7.5 million in the three and six months ended June 30, 2014 from the comparable periods in 2013 primarily due to the cost of the incremental revenue from our acquisition of Evergreen on September 13, 2013.

SK Environmental Services cost of revenues decreased$0.6 million and $9.5 million in the three and six months ended June 30, 2014 from the comparable periods in 2013 primarily due to system changes which occurred in May of 2013 and impacted how intercompany disposal charges are recorded between the SK Environmental Services segment and the Technical Services segment and lower refined fuel oil sales period over period.

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Lodging Services cost of revenues decreased$0.8 million, in the three months ended June 30, 2014 from the comparable period in 2013 primarily due to lower revenue. Lodging cost of revenuesincreased$6.7 million, in thesix months ended June 30, 2014 from the comparable period in 2013 primarily due to increases in materials and supplies, subcontractors, equipment repairs and utilities associated with increased capacity partially offset by a decrease in catering.

Oil and Gas Field Services cost of revenues decreased$8.3 million and $12.4 million in the three and six months ended June 30, 2014 from the comparable periods in 2013 primarily due to salaries, internal maintenance expense and equipment repairs in connection with overall lower business activity and revenues.

Selling, General and Administrative Expenses

Technical Services selling, general and administrative expenses remained approximately flat and increased$1.7 million in the three and six months ended June 30, 2014 from the comparable periods in 2013 primarily due to an increase in variable compensation partially offset by cost saving initiatives.

Industrial and Field Services selling, general and administrative expenses decreased$0.4 million and $0.9 million in the three and six months ended June 30, 2014 from the comparable periods in 2013 primarily due to cost saving initiatives

Oil Re-refining and Recycling selling, general and administrative expenses remained flat in the three months ended June 30, 2014. Oil Re-refining and Recycling selling, general and administrative expenses decreased$2.0 million, in the six months ended June 30, 2014 from the comparable period in 2013 primarily due to cost saving initiatives.

SK Environmental Services selling, general and administrative expenses decreased$0.7 million and $1.1 million in the three and six months ended June 30, 2014 from the comparable periods in 2013 primarily due to cost saving initiatives partially offset by increases in variable compensation.

Lodging Services selling, general and administrative expenses increased$0.4 million and $0.5 million in the three and six months ended June 30, 2014 from the comparable periods in 2013 primarily due to increases in salaries and professional fees associated with increased capacityin both comparable periods.

Oil and Gas Field Services selling, general and administrative expenses remained approximately flat in the three and six months ended June 30, 2014 from the comparable periods in 2013 primarily due to increases in compensation offset by cost saving initiatives.

Corporate Items selling, general and administrative expenses decreased$6.2 million and $14.3 million for the three and six months ended June 30, 2014, as compared to the same periods in 2013 primarily due to cost saving initiatives and acquisition related costs that did not reoccur in the six months ended 2014.

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, therefore our measurements of Adjusted EBITDA may not be comparable to similarly titled measures reported by other companies.

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 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 the how the fundamental business is performing and is being managed.

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

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

	For the Three Months Ended					For the Six Months Ended
	June 30,					June 30,
	2014		2013			2014			2013
Net income	$	28,672	$	22,902		$	37,632		$	33,404
Accretion of environmental liabilities	2,609		2,879			5,333			5,714
Depreciation and amortization	66,075		67,468			135,431			127,474
Other expense (income)	655		(1,655		)	(3,523		)	(2,180		)
Interest expense, net	19,382		19,585			38,936			39,458
Pre-tax, non-cash acquisition accounting inventory adjustment	—		—			—			13,559
Provision for income taxes	18,406		12,411			23,976			17,389
Adjusted EBITDA	$	135,799	$	123,590		$	237,785		$	234,818

Depreciation and Amortization

	For the Three Months Ended									For the Six Months Ended
	June 30,				2014 over 2013					June 30,				2014 over 2013
	2014		2013		$ Change			% Change		2014		2013		$ Change			% Change
Depreciation of fixed assets	$	54,280	$	54,337	$	(57	)	(0.1	)%	$	110,938	$	102,905	$	8,033		7.8	%
Landfill and other amortization	11,795		13,131		(1,336		)	(10.2	)%	24,493		24,569		(76		)	(0.3	)%
Total depreciation and amortization	$	66,075	$	67,468	$	(1,393	)	(2.1	)%	$	135,431	$	127,474	$	7,957		6.2	%

Depreciation and amortization decreased2.1%, or $1.4 million, in the three months ended June 30, 2014 from the comparable period in 2013 primarily due to decreased landfill amortization. Landfill and other amortization decreased primarily due to the decrease in volumes at our landfill facilities offset by additional amortization resulting from an increase in other intangibles balances from recent acquisitions.

Depreciation and amortization increased6.2%, or $8.0 million, in the six months ended June 30, 2014 from the comparable period in 2013. Depreciation of fixed assets increased primarily due to acquisitions and other increased capital expenditures in recent periods. Landfill and other amortization decreased primarily due to the decrease in volumes at our landfill facilities offset by additional amortization resulting from an increase in other intangibles balances from recent acquisitions.

Other (Expense) Income

	For the Three Months Ended										For the Six Months Ended
	June 30,					2014 over 2013					June 30,				2014 over 2013
	2014			2013		$ Change			% Change		2014		2013		$ Change		% Change
Other (expense) income	$	(655	)	$	1,655	$	(2,310	)	(139.6	)%	$	3,523	$	2,180	$	1,343	61.6	%

Other (expense) income decreased$2.3 million in the three months ended June 30, 2014 from the comparable period in 2013 primarily due to losses on fixed asset disposals recorded in the second quarter of 2014 versus gains recorded in 2013.

Other (expense) income increased$1.3 million in the six months ended June 30, 2014 from the comparable period in 2013 primarily due to gains recognized on the sale available-for-sale securities which occurred in 2014.

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Provision for Income Taxes

	For the Three Months Ended										For the Six Months Ended
	June 30,						2014 over 2013				June 30,						2014 over 2013
	2014			2013			$ Change		% Change		2014			2013			$ Change		% Change
Provision for income taxes	$	18,406		$	12,411		$	5,995	48.3	%	$	23,976		$	17,389		$	6,587	37.9	%
Effective income tax rate	39.1		%	35.1		%					38.9		%	34.2		%

     Income tax expense for the three months ended June 30, 2014increased$6.0 million as compared to the comparable period in 2013. The increase is a result of a combination of increased income, the recording of an audit settlement and an increase in the effective rate driven by a greater percentage of taxable earnings being generated in the U.S. versus Canada as compared to 2013.

Income tax expense for the six months ended June 30, 2014increased$6.6 million as compared to the comparable period in 2013. The increase is a result of a combination of increased income, the recording of an audit settlement and an increase in the effective rate driven by a greater percentage of taxable earnings being generated in the U.S. versus Canada as compared to 2013 as well as the release of an unrecognized tax benefit recorded in 2013.

A valuation allowance is required to be established when, based on an evaluation of available evidence, it is more likely than not that some portion or all of the deferred tax assets will not be realized. At June 30, 2014 and December 31, 2013, we had a remaining valuation allowance of $28.6 million and $29.7 million, respectively. The allowance as of June 30, 2014 consisted of $13.4 million of foreign tax credits, $5.9 million of state net operating loss carryforwards, $7.5 million of foreign net operating loss carryforwards and $1.8 million for the deferred tax assets of a Canadian subsidiary. The allowance as of December 31, 2013 consisted of $13.4 million of foreign tax credits, $7.0 million of state net operating loss carryforwards, $7.5 million of foreign net operating loss carryforwards and $1.8 million for the deferred tax assets of a Canadian subsidiary.

Liquidity and Capital Resources

	For the Six Months Ended
(in thousands)	2014			2013
Net cash from operating activities	$	114,944		$	137,612
Net cash used in investing activities	(131,294		)	(141,441		)
Net cash from financing activities	(14,892		)	40,019

Net cash from operating activities

Net cash from operating activities for the six months ended June 30, 2014 was $114.9 million, a decrease of 16.5%, or $22.7 million, compared with net cash from operating activities for the comparable period in 2013. The change was primarily the result of a net increase in working capital driven by the payment of liabilities existing at the beginning of the period.

Net cash used in investing activities

Net cash used in investing activities for six months ended June 30, 2014 was $131.3 million, a decrease of 7.2% compared with $141.4 million of cash used in investing activities for the comparable period in 2013. The change was primarily the result of decreases in capital expenditures and proceeds received from the sale of marketable securities offset by cash paid for an acquisition.

Net cash from financing activities

Net cash from financing activities for the six months ended June 30, 2014 was an outflow of $14.9 million, compared to net inflows of cash from financing activities of $40.0 million for the comparable period in 2013. The change in net cash from financing activities during the six months ended June 30, 2014 was primarily due to a decrease in uncashed checks as of June 30, 2014 combined with repurchases of common stock made in the first six months of 2014 and repayment of long term obligations.

Working Capital

We intend to use our existing cash and cash equivalents and cash flows from operations primarily to provide for our working capital needs and to fund capital expenditures and potential future acquisitions. We anticipate that our operating cash flow will provide the necessary funds on both a short- and long-term basis to meet operating cash requirements.

At June 30, 2014, cash and cash equivalents totaled $278.6 million, compared to $310.1 million at December 31, 2013. At June 30, 2014, cash and cash equivalents held by foreign subsidiaries totaled $83.8 million and were readily convertible into other

32

foreign currencies including U.S. dollars. At June 30, 2014, the cash and cash equivalent balances for our U.S. operations were $194.8 million. Our U.S. operations had net operating cash from operations of $51.9 million for the six months ended June 30, 2014. Additionally, we have available a $400.0 million revolving credit facility of which $287.8 million was available to borrow at June 30, 2014. 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 investing cash needs as well as any cash needs relating to the stock repurchase program. Furthermore, the existing cash balances and the availability of additional borrowings under our revolving credit facility provide potential sources of liquidity should they be required.

Common Stock Repurchase Program

On February 25, 2014, our Board of Directors authorized the repurchase of up to $150 million of our common stock. We intend 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. The share repurchases will be made in a manner that complies with applicable U.S. securities laws. The number of shares purchased and the timing of the purchases will depend on a number of factors, including share price, cash required for future 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. As of June 30, 2014, we had repurchased and retired a total of approximately 273,000 shares of our common stock for approximately $16.2 million under this program. As of June 30, 2014, an additional $133.8 million remains available for repurchase of shares under the current authorized program.

Financing Arrangements

The financing arrangements and principal terms of our $800.0 million principal amount of 5.25% senior unsecured notes due 2020 and $595.0 million principal amount of 5.125% senior unsecured notes due 2021 which were outstanding at June 30, 2014, and our $400.0 million revolving credit facility, are discussed further in Note 10, “Financing Arrangements,” to our consolidated financial statements included in Item 8 of our Annual Report on Form 10-K for the year ended December 31, 2013.

As of June 30, 2014, 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.

Capital Expenditures

We anticipate that 2014 capital spending will be approximately $250 million, which includes our incinerator project in El Dorado. 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 six months of 2014 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, 2013.

Goodwill. Goodwill is not amortized but is reviewed for impairment annually as of December 31, or 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. If the fair value is less than the carrying amount, a more detailed analysis is performed to determine if goodwill is impaired. The loss, if any, is measured as the excess of the carrying value of the goodwill over the implied value of the goodwill.

We determine our reporting units by identifying the components of each operating segment, and then aggregate components having similar economic characteristics based on quantitative and / or qualitative factors. At June 30, 2014 and December 31, 2013, we had seven reporting units. The Technical Services, Industrial Services, Field Services, Oil Re-refining and Recycling, SK Environmental Services, Lodging Services and Oil and Gas Field Services operating segments each constitute a reporting unit.

We conducted our annual impairment test of goodwill for all of our reporting units as of December 31, 2013 and determined that no adjustment to the carrying value of goodwill for any reporting unit was necessary because the fair values of the reporting units exceeded their respective carrying values.

33

The fair value of the Oil Re-refining and Recycling reporting unit exceeded the carrying value by less than 10% at December 31, 2013. During the first six months of fiscal 2014 the reporting unit has experienced lower than anticipated financial results primarily due to lower sales mix between base oils and higher priced blended oils as well as higher utilities and shutdown related costs. The lower sales prices reflected general economic conditions in the oil industry during the period. The financial performance of this reporting unit, which had a goodwill balance of approximately $174.7 million at June 30, 2014, is affected by fluctuations in oil prices, overall market supply of refined oil and sales mix. In the future, if market factors were to lead to significant declines in the reporting units overall pricing, impairments could arise.

The fair value of the Oil and Gas Field Services reporting unit exceeded its carrying value by more than 10% at December 31, 2013. The financial performance of this reporting unit, which had a goodwill balance of approximately $36.4 million at June 30, 2014, was affected in the first six months ended June 30, 2014 by pricing pressure and lower levels of overall activity in the markets and regions that the business serves. The Oil and Gas Field Services reporting unit is seasonal with the second quarter of the fiscal year historically being the period with the lowest earnings levels.

Significant judgments are inherent in the annual impairment tests performed and include assumptions about the amount and timing of expected future cash flows, growth rates, and the determination of appropriate discount rates. We believe that the assumptions used in our impairment analysis are reasonable, but variations in any of the assumptions may result in different calculations of fair values that could result in a material impairment charge. The annual impairment test performed during the year ended December 31, 2013 utilized future annual budgeted amounts and discount rate assumptions based on an assessment of our weighted average cost of capital as well as other significant assumptions believed to be reasonable at that time.

During the interim periods of fiscal year 2014 and with respect to the Oil Re-Refining and Recycling and Oil and Gas Field Services reporting units, we considered whether (i) the lower than anticipated results (ii) general economic and industry conditions, and (iii) reporting unit specific factors would more likely than not reduce the estimated fair values of our reporting units below their carrying values. We have not performed an interim test for impairment of goodwill for any of our reporting units as it does not believe the factors impacting the performance of the reporting units through June 30, 2014 would more likely than not reduce the fair value below carrying value.

The performance of the Oil Re-Refining and Recycling and Oil and Gas Field Services reporting units will continue to be monitored. If these reporting units do not achieve the financial performance that the Company expects, it is possible that a goodwill impairment charge may result. There can be no assurance that future events will not result in an impairment of goodwill

ITEM 3.QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

There were no material changes in the first six months of 2014 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, 2013.

ITEM 4.CONTROLS AND PROCEDURES

Evaluation of Disclosure Controls and Procedures

Based on an evaluation under the supervision and with the participation of our management, including 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 in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”)) were effective as of June 30, 2014 to ensure that information required to be disclosed by us in reports that we file or submit under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in Securities and Exchange Commission rules and forms and is accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer, as appropriate to allow timely decisions regarding required disclosure.

Changes in Internal Control over Financial Reporting

There were no changes in the Company’s internal control over financial reporting identified in connection with the evaluation required by paragraph (d) of Exchange Act Rules 13a-15 or 15d-15 that was conducted during the quarter ending June 30, 2014 that have materially affected, or are reasonably likely to materially affect, the Company’s internal control over financial reporting.

34

CLEAN HARBORS, INC. AND SUBSIDIARIES

PART II—OTHER INFORMATION

ITEM 1.LEGAL PROCEEDINGS

See Note 16, “Commitments and Contingencies,” to the financial statements included in Item 1 of this report, which description is incorporated herein by reference.

ITEM 1A.RISK FACTORS

During the six months ended June 30, 2014, 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, 2013. 

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

Common Stock Repurchase Program

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

Period	Total Number of Shares Purchased (1)	Average Price Paid Per Share (2)		Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs	Approximate Dollar Value of Shares that May Yet Be Purchased Under the Plans or Programs (3)
April 1, 2014 through April 30, 2014	2,413	$	54.64	—	$	148,774.735
May 1, 2014 through May 31, 2014	199,459	$	59.87	198,085	$	136,914,638
June 1, 2014 through June 30, 2014	69,908	$	62.73	50,000	$	133,781,383
Total	271,780	$	60.56	248,085	$	133,781,383

______________________

(1) Includes 23,695 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 the brokers.

(3) On February 25, 2014, our Board of Directors authorized the repurchase of up to $150 million of our common stock. We 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. The stock repurchases will be made in a manner that complies with applicable U.S. securities laws. The number of shares purchased and the timing of the purchases will depend on a number of factors, including share price, cash required for future 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

35

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 James M. Rutledge	Filed herewith
32	Section 1350 Certifications	Filed herewith
101	Interactive Data Files Pursuant to Rule 405 of Regulation S-T: Financial statements from the quarterly report on Form 10-Q of Clean Harbors, Inc. for the quarter ended June 30, 2014, formatted in XBRL: (i) Consolidated Balance Sheets, (ii) Unaudited Consolidated Statements of Income, (iii) Unaudited Consolidated Statements of Comprehensive Income (Loss), (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.

36

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 and Chief Executive Officer
Date:	August 7, 2014
		By:	/s/  JAMES M. RUTLEDGE
			James M. Rutledge
			Vice Chairman, President and Chief Financial Officer
Date:	August 7, 2014

37

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 and Chief Executive Officer

Date: August 7, 2014

EX-31.2

Exhibit 31.2

CERTIFICATION OF CHIEF FINANCIAL OFFICER

I, James M. Rutledge, 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/ James M. Rutledge

James M. Rutledge

Vice Chairman, President and Chief Financial Officer

Date: August 7, 2014

EX-32

EXHIBIT 32

CLEAN HARBORS, INC. AND SUBSIDIARIES

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

Pursuant to 18 U.S.C. §1350, each of the undersigned certifies that, to his knowledge, this Quarterly Report on Form 10-Q for the period ended June 30, 2014 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 and Chief Executive Officer
Date:	August 7, 2014
		By:	/s/  JAMES M. RUTLEDGE
			James M. Rutledge
			Vice Chairman, President and Chief Financial Officer
Date:	August 7, 2014

XML

STOCK-BASED COMPENSATION (Tables)

6 Months Ended

Jun. 30, 2014

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Summary of total number, weighted-average grant-date fair value, and types of awards granted

The following table summarizes the total number and type of awards granted during the three and six months ended June 30, 2014, as well as the related weighted-average grant-date fair values:

	Three Months Ended			Six Months Ended
	June 30, 2014			June 30, 2014
	Shares	Weighted Average Grant-Date Fair Value		Shares	Weighted Average Grant-Date Fair Value
Restricted stock awards	103,130	$	61.85	107,630	$	61.55
Performance stock awards	130,107	$	62.20	130,107	$	62.20
Total awards	233,237			237,737

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INCOME TAXES (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Income Tax Contingency [Line Items]
The Company's effective tax rate (as a percent)	39.10%	35.10%	38.90%	34.20%
Unrecognized tax benefits	$ 1.3		$ 1.3		$ 1.3
Unrecognized tax benefits, interest	0.2		0.2		0.2
Foreign and State
Income Tax Contingency [Line Items]
Amount of decrease in unrecognized tax benefits that, if realized, will impact the effective tax rate	$ 0.1		$ 0.1

XML

GOODWILL AND OTHER INTANGIBLE ASSETS (Amortizable Other Intangible Assets) (Details) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Cost	$ 567,106,000		$ 567,106,000		$ 564,525,000
Accumulated Amortization	138,045,000		138,045,000		119,190,000
Net	429,061,000		429,061,000		445,335,000
Weighted Average Remaining Amortization Period (in years)			11 years 248 days		12 years 2 months 12 days
Total permits and other intangible assets, Cost	691,703,000		691,703,000		689,163,000
Total permits and other intangible assets, Net	553,658,000		553,658,000		569,973,000
Amortization of Intangible Assets	8,900,000	8,800,000	18,400,000	17,100,000
Trademarks and trade names
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Indefinite-Lived Intangible Asset, Cost	124,597,000		124,597,000		124,638,000
Permits
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Cost	158,633,000		158,633,000		157,327,000
Accumulated Amortization	53,278,000		53,278,000		50,858,000
Net	105,355,000		105,355,000		106,469,000
Weighted Average Remaining Amortization Period (in years)			19 years 328 days		19 years 7 months 6 days
Customer and supplier relationships
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Cost	377,686,000		377,686,000		377,899,000
Accumulated Amortization	66,925,000		66,925,000		52,814,000
Net	310,761,000		310,761,000		325,085,000
Weighted Average Remaining Amortization Period (in years)			11 years 146 days		12 years 1 month 6 days
Other intangible assets
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Cost	30,787,000		30,787,000		29,299,000
Accumulated Amortization	17,842,000		17,842,000		15,518,000
Net	$ 12,945,000		$ 12,945,000		$ 13,781,000
Weighted Average Remaining Amortization Period (in years)			3 years 36 days		3 years 3 months 18 days

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EARNINGS PER SHARE (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Numerator for basic and diluted earnings per share:
Net income	$ 28,672	$ 22,902	$ 37,632	$ 33,404
Denominator:
Basic shares outstanding	60,665	60,550	60,695	60,507
Dilutive effect of equity-based compensation awards (in shares)	113	137	127	151
Dilutive shares outstanding	60,778	60,687	60,822	60,658
Basic earnings per share (in USD per share)	$ 0.47	$ 0.38	$ 0.62	$ 0.55
Diluted earnings per share (in USD per share)	$ 0.47	$ 0.38	$ 0.62	$ 0.55

XML

GOODWILL AND OTHER INTANGIBLE ASSETS (Rollforward of Goodwill) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014
Goodwill [Roll Forward]
Balance at January 1, 2014	$ 570,960
Acquired from acquisitions	4,852
Increase from adjustments during the measurement period related to Evergreen	3,518
Foreign currency translation	(356)
Balance at June 30, 2014	$ 578,974

XML

ACCRUED EXPENSES (Tables)

6 Months Ended

Jun. 30, 2014

Payables and Accruals [Abstract]

Accrued expenses

Accrued expenses consisted of the following (in thousands):

	June 30, 2014		December 31, 2013
Insurance	$	62,969	$	57,993
Interest	20,666		20,731
Accrued compensation and benefits	62,032		60,902
Income, real estate, sales and other taxes	46,838		38,938
Other	52,863		58,265
Total accrued expenses	$	245,368	$	236,829

XML

ACCUMULATED OTHER COMPREHENSIVE LOSS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Components of Other Accumulated Income, Net of Tax [Roll Forward]
Beginning balance			$ (19,556)
Other comprehensive (loss) gain before reclassifications			(2,471)
Amounts reclassified out of accumulated other comprehensive loss			(3,361)
Tax effects			363
Other comprehensive income (loss)	36,056	(35,506)	(5,469)	(59,367)
Ending balance	(25,025)		(25,025)
Foreign Currency Translation
Components of Other Accumulated Income, Net of Tax [Roll Forward]
Beginning balance			(20,164)
Other comprehensive (loss) gain before reclassifications			(3,411)
Amounts reclassified out of accumulated other comprehensive loss			0
Tax effects			0
Other comprehensive income (loss)			(3,411)
Ending balance	(23,575)		(23,575)
Unrealized (Losses) Gains on Available-For-Sale Securities
Components of Other Accumulated Income, Net of Tax [Roll Forward]
Beginning balance			1,904
Other comprehensive (loss) gain before reclassifications			940
Amounts reclassified out of accumulated other comprehensive loss	(53)		(3,361)
Tax effects			363
Other comprehensive income (loss)			(2,058)
Ending balance	(154)		(154)
Unfunded Pension Liability
Components of Other Accumulated Income, Net of Tax [Roll Forward]
Beginning balance			(1,296)
Other comprehensive (loss) gain before reclassifications			0
Amounts reclassified out of accumulated other comprehensive loss			0
Tax effects			0
Other comprehensive income (loss)			0
Ending balance	$ (1,296)		$ (1,296)

XML

COMMITMENTS AND CONTINGENCIES

6 Months Ended

Jun. 30, 2014

Commitments and Contingencies Disclosure [Abstract]

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES

Legal and Administrative Proceedings

The Company and its subsidiaries are subject to legal proceedings and claims arising in the ordinary course of business. Actions filed against the Company arise from commercial and employment-related claims including alleged class actions related to sales practices and wage and hour claims. The plaintiffs in these actions may be seeking damages or injunctive relief or both. These actions are in various jurisdictions and stages of proceedings, and some are covered in part by insurance. In addition, the Company’s waste management services operations are regulated by federal, state, provincial and local laws enacted to regulate discharge of materials into the environment, remediation of contaminated soil and groundwater or otherwise protect the environment. This ongoing regulation results in the Company frequently becoming a party to legal or administrative proceedings involving all levels of governmental authorities and other interested parties. The issues involved in such proceedings generally relate to alleged violations of existing permits and licenses or alleged responsibility under federal or state Superfund laws to remediate contamination at properties owned either by the Company or by other parties (“third party sites”) to which either the Company or the prior owners of certain of the Company’s facilities shipped wastes.

At June 30, 2014 and December 31, 2013, the Company had recorded reserves of $44.4 million and $41.7 million, respectively, in the Company's financial statements for actual or probable liabilities related to the legal and administrative proceedings in which the Company was then involved, the principal of which are described below. At June 30, 2014 and December 31, 2013, the Company also believed that it was reasonably possible that the amount of these potential liabilities could be as much as $3.5 million more. The Company periodically adjusts the aggregate amount of these reserves when actual or probable liabilities are paid or otherwise discharged, new claims arise, or additional relevant information about existing or probable claims becomes available. As of June 30, 2014, the $44.4 million of reserves consisted of (i) $35.2 million related to pending legal or administrative proceedings, including Superfund liabilities, which were included in remedial liabilities on the consolidated balance sheets, and (ii) $9.2 million primarily related to federal, state and provincial enforcement actions, which were included in accrued expenses on the consolidated balance sheets.

As of June 30, 2014, the principal legal and administrative proceedings in which the Company was involved, or which had been terminated during 2014, 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 that are scheduled to be heard in September of 2014. 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 Mercier Subsidiary continues to assert that it has no responsibility for the groundwater contamination in the region and will contest any action by the Ministry to impose costs for remedial measures on the Mercier Subsidiary. The Company also continues to pursue settlement options. At June 30, 2014 and December 31, 2013, the Company had accrued $13.9 million and $13.6 million, respectively, for remedial liabilities relating to the Ville Mercier legal proceedings.

Safety-Kleen Legal Proceedings. On December 28, 2012, the Company acquired Safety-Kleen and thereby became subject to the legal proceedings in which Safety-Kleen was a party on that date. In addition to certain Superfund proceedings in which Safety-Kleen has been named as a potentially responsible party as described below under “Superfund Proceedings,” the principal such legal proceedings involving Safety-Kleen which were outstanding as of June 30, 2014 were as follows:

Product Liability Cases. Safety-Kleen is named as a defendant in various lawsuits that are currently pending in various courts and jurisdictions throughout the United States, including approximately 64 proceedings (excluding cases which have been settled but not formally dismissed) as of June 30, 2014, wherein persons claim personal injury resulting from the use of Safety-Kleen's parts cleaning equipment or cleaning products. These proceedings typically involve allegations that the solvent used in Safety-Kleen's parts cleaning equipment contains contaminants and/or that Safety-Kleen's recycling process does not effectively remove the contaminants that become entrained in the solvent during their use. In addition, certain claimants assert that Safety-Kleen failed to warn adequately the product user of potential risks, including an historic failure to warn that solvent contains trace amounts of toxic or hazardous substances such as benzene. Safety-Kleen maintains insurance that it believes will provide coverage for these claims (over amounts accrued for self-insured retentions and deductibles in certain limited cases), except for punitive damages to the extent not insurable under state law or excluded from insurance coverage. Safety-Kleen believes that these claims lack merit and has historically vigorously defended, and intends to continue to vigorously defend, itself and the safety of its products against all of these claims. Such matters are subject to many uncertainties and outcomes are not predictable with assurance. Consequently, Safety-Kleen is unable to ascertain the ultimate aggregate amount of monetary liability or financial impact with respect to these matters as of June 30, 2014. From December 31, 2013 to June 30, 2014, eight 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.    

Fee Class Action Claims. In October 2010, two customers filed a complaint, individually and on behalf of all similarly situated customers in the State of Alabama, alleging that Safety-Kleen improperly assessed fuel surcharges and extended area service fees. In 2012, similar lawsuits were filed by the same law firm in California and Missouri. It is Safety-Kleen's position that it had the right to assess fuel surcharges, that the customers were contractually obligated or otherwise consented to the charges and that the surcharges were voluntarily paid by the customers when presented with an invoice. A class has not been certified in any of these cases, and no reserve has been recorded.

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 125 sites which are subject to or are proposed to become subject to proceedings under federal or state Superfund laws. Of the 125 sites, two (the Wichita Facility and the BR Facility described below) involve facilities that are now owned by the Company and 123 involve third party sites to which either the Company or the prior owners of certain of the Company’s facilities shipped wastes. Of the 123 third party sites, 29 are now settled, 20 are currently requiring expenditures on remediation and 74 are not currently requiring expenditures on remediation.

In connection with each site, the Company has estimated the extent, if any, to which it may be subject, either directly or as a result of any indemnification obligations, for cleanup and remediation costs, related legal and consulting costs associated with PRP investigations, settlements, and related legal and administrative proceedings. The amount of such actual and potential liability is inherently difficult to estimate because of, among other relevant factors, uncertainties as to the legal liability (if any) of the Company or the prior owners of certain of the Company's facilities to contribute a portion of the cleanup costs, the assumptions that must be made in calculating the estimated cost and timing of remediation, the identification of other PRPs and their respective capability and obligation to contribute to remediation efforts, and the existence and legal standing of indemnification agreements (if any) with prior owners, which may either benefit the Company or subject the Company to potential indemnification obligations. In addition to the Wichita Property and the BR Facility, Clean Harbors believes its potential liability could exceed $100,000 at 15 of the 123 third party sites.

Wichita Property.    The Company acquired in 2002 as part of the CSD assets a service center located in Wichita, Kansas (the "Wichita Property"). The Wichita Property is one of several properties located within the boundaries of a 1,400 acre state-designated Superfund site in an old industrial section of Wichita known as the North Industrial Corridor Site. Along with numerous other PRPs, the former owner executed a consent decree relating to such site with the U.S. Environmental Protection Agency (the "EPA"), and the Company is continuing an ongoing remediation program for the Wichita Property in accordance with that consent decree. The Company also acquired rights under an indemnification agreement between the former owner and an earlier owner of the Wichita Property which the Company anticipates but cannot guarantee will be available to reimburse certain such cleanup costs.

BR Facility.    The Company acquired in 2002 a former hazardous waste incinerator and landfill in Baton Rouge (the "BR Facility"), for which operations had been previously discontinued by the prior owner. In September 2007, the EPA issued a special notice letter to the Company related to the Devil's Swamp Lake Site ("Devil's Swamp") in East Baton Rouge Parish, Louisiana. Devil's Swamp includes a lake located downstream of an outfall ditch where wastewater and stormwater have been discharged, and Devil's Swamp is proposed to be included on the National Priorities List due to the presence of Contaminants of Concern ("COC") cited by the EPA. These COCs include substances of the kind found in wastewater and storm water discharged from the BR Facility in past operations. The EPA originally requested COC generators to submit a good faith offer to conduct a remedial investigation feasibility study directed towards the eventual remediation of the site. The Company is currently performing corrective actions at the BR Facility under an order issued by the Louisiana Department of Environmental Quality (the "LDEQ"), 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 123 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 five 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 16 sites for waste disposed prior to the Company's (or Safety-Kleen's) acquisition of the former subsidiaries of Waste Management or McKesson which had shipped wastes to those sites. Accordingly, Waste Management or McKesson are paying all costs of defending those subsidiaries in those 16 cases, including legal fees and settlement costs. However, there can be no guarantee that the Company's ultimate liabilities for those sites will not exceed the amount recorded or that indemnities applicable to any of these sites will be available to pay all or a portion of related costs. Except for the indemnification agreements which the Company holds from ChemWaste and McKesson, the Company does not have an indemnity agreement with respect to any of the 123 third party sites discussed above.

Federal, State and Provincial Enforcement Actions

From time to time, the Company pays fines or penalties in regulatory proceedings relating primarily to waste treatment, storage or disposal facilities. As of June 30, 2014 and December 31, 2013, there were three and five proceedings, respectively, for which the Company reasonably believed that the sanctions could equal or exceed $100,000. The Company believes that the fines or other penalties in these or any of the other regulatory proceedings will, individually or in the aggregate, not have a material effect on its financial condition, results of operations or cash flows.

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ACCRUED EXPENSES (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Payables and Accruals [Abstract]
Insurance	$ 62,969	$ 57,993
Interest	20,666	20,731
Accrued compensation and benefits	62,032	60,902
Income, real estate, sales and other taxes	46,838	38,938
Other	52,863	58,265
Total accrued expenses	$ 245,368	$ 236,829

XML

BUSINESS COMBINATIONS (Evergreen Oil, Inc) (Details) (USD $)					0 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014 Evergreen Oil, Inc	Sep. 13, 2013 Evergreen Oil, Inc	May 30, 2014 Privately Owned Domestic Company	Dec. 31, 2013 Preliminary Allocations Evergreen Oil, Inc	Jun. 30, 2014 Measurement Period Adjustments Evergreen Oil, Inc
Business Acquisition [Line Items]
Outstanding common shares acquired (as a percent)				100.00%
Summary of recognized assets acquired and liabilities assumed
Inventories and supplies			$ 1,089,000			$ 1,089,000	$ 0
Prepaid and other current assets			1,018,000			1,291,000	(273,000)
Property, plant and equipment			40,563,000			40,563,000	0
Permits and other intangibles			17,100,000			17,100,000	0
Deferred tax assets, less current portion			0			2,368,000	(2,368,000)
Other assets			3,368,000			3,607,000	(239,000)
Current liabilities			(5,980,000)			(6,198,000)	218,000
Closure and post-closure liabilities			(659,000)			(659,000)	0
Remedial liabilities, less current portion			(1,640,000)			(2,103,000)	463,000
Deferred taxes, unrecognized tax benefits and other long-term liabilities			(2,059,000)			(1,139,000)	(920,000)
Total identifiable net assets			52,800,000			55,919,000	(3,119,000)
Goodwill	578,974,000	570,960,000	3,518,000			0	3,518,000
Total			56,318,000			55,919,000	399,000
Purchase price of acquisition					$ 6,200,000

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EARNINGS PER SHARE (Tables)

6 Months Ended

Jun. 30, 2014

Earnings Per Share [Abstract]

Reconciliation of basic and diluted earnings per share computations

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

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2014		2013		2014		2013
Numerator for basic and diluted earnings per share:
Net income	$	28,672	$	22,902	$	37,632	$	33,404
Denominator:
Basic shares outstanding	60,665		60,550		60,695		60,507
Dilutive effect of equity-based compensation awards	113		137		127		151
Dilutive shares outstanding	60,778		60,687		60,822		60,658
Basic earnings per share:	$	0.47	$	0.38	$	0.62	$	0.55
Diluted earnings per share:	$	0.47	$	0.38	$	0.62	$	0.55

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REMEDIAL LIABILITIES (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at January 1, 2014	$ 172,498
Adjustments during the measurement period related to Evergreen	(518)
Accretion	3,134
Changes in estimates recorded to statement of income	(1,525)
Expenditures	(5,677)
Currency translation and other	(85)
Balance at June 30, 2014	167,827
Remedial Liabilities for Landfill Sites
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at January 1, 2014	5,624
Adjustments during the measurement period related to Evergreen	0
Accretion	133
Changes in estimates recorded to statement of income	(126)
Expenditures	(57)
Currency translation and other	(10)
Balance at June 30, 2014	5,564
Remedial Liabilities for Inactive Sites
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at January 1, 2014	74,262
Adjustments during the measurement period related to Evergreen	0
Accretion	1,534
Changes in estimates recorded to statement of income	(2,467)
Expenditures	(2,489)
Currency translation and other	7
Balance at June 30, 2014	70,847
Remedial Liabilities (Including Superfund) for Non-Landfill Operations
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at January 1, 2014	92,612
Adjustments during the measurement period related to Evergreen	(518)
Accretion	1,467
Changes in estimates recorded to statement of income	1,068
Expenditures	(3,131)
Currency translation and other	(82)
Balance at June 30, 2014	$ 91,416

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GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION (Condensed Consolidating Statements of (Loss) Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Revenues:
Service revenues	$ 665,275	$ 673,872	$ 1,325,370	$ 1,346,494
Product revenues	193,205	186,656	379,777	376,197
Total revenues	858,480	860,528	1,705,147	1,722,691
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	445,757	455,603	912,556	923,975
Product cost of revenues	161,193	158,723	320,113	326,375
Total cost of revenues	606,950	614,326	1,232,669	1,250,350
Selling, general and administrative expenses	115,731	122,612	234,693	251,082
Accretion of environmental liabilities	2,609	2,879	5,333	5,714
Depreciation and amortization	66,075	67,468	135,431	127,474
Income from operations	67,115	53,243	97,021	88,071
Other (expense) income	(655)	1,655	3,523	2,180
Interest (expense) income	(19,382)	(19,585)	(38,936)	(39,458)
Equity in earnings of subsidiaries	0	0	0	0
Intercompany dividend income	0	0	0	0
Intercompany interest income (expense)	0	0	0	0
Income before provision for income taxes	47,078	35,313	61,608	50,793
Provision (benefit) for income taxes	18,406	12,411	23,976	17,389
Net income (loss)	28,672	22,902	37,632	33,404
Other comprehensive income (loss)	36,056	(35,506)	(5,469)	(59,367)
Comprehensive income (loss)	64,728	(12,604)	32,163	(25,963)
Clean Harbors, Inc.
Revenues:
Service revenues		0		0
Product revenues		0		0
Total revenues	0	0	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	0	0
Selling, general and administrative expenses	25	30	56	55
Accretion of environmental liabilities	0	0		0
Depreciation and amortization	0	0		0
Income from operations	(25)	(30)	(56)	(55)
Other (expense) income	0	0		0
Interest (expense) income	(19,612)	(19,764)	(39,346)	(39,564)
Equity in earnings of subsidiaries	54,436	45,106	84,545	75,327
Intercompany dividend income	0	0	0	0
Intercompany interest income (expense)		0		0
Income before provision for income taxes	34,799	25,312	45,143	35,708
Provision (benefit) for income taxes	6,127	2,410	7,511	2,304
Net income (loss)	28,672	22,902	37,632	33,404
Other comprehensive income (loss)	36,056	(35,506)	(5,469)	(59,367)
Comprehensive income (loss)	64,728	(12,604)	32,163	(25,963)
U.S. Guarantor Subsidiaries
Revenues:
Service revenues	476,268	497,731	920,142	896,966
Product revenues	151,667	89,740	286,542	250,603
Total revenues	627,935	587,471	1,206,684	1,147,569
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	317,861	341,768	622,502	615,940
Product cost of revenues	118,560	73,712	233,488	217,353
Total cost of revenues	436,421	415,480	855,990	833,293
Selling, general and administrative expenses	82,513	89,884	170,066	185,445
Accretion of environmental liabilities	2,219	2,437	4,567	4,837
Depreciation and amortization	41,289	44,220	84,021	81,509
Income from operations	65,493	35,450	92,040	42,485
Other (expense) income	(123)	2,249	786	2,969
Interest (expense) income	216	0	446	0
Equity in earnings of subsidiaries	3,393	14,563	11,855	35,976
Intercompany dividend income		0		0
Intercompany interest income (expense)	9,497	9,969	18,881	20,307
Income before provision for income taxes	78,476	62,231	124,008	101,737
Provision (benefit) for income taxes	13,586	7,009	17,691	6,535
Net income (loss)	64,890	55,222	106,317	95,202
Other comprehensive income (loss)	36,056	(35,506)	(5,469)	(59,367)
Comprehensive income (loss)	100,946	19,716	100,848	35,835
Foreign Non-Guarantor Subsidiaries
Revenues:
Service revenues	194,579	171,019	413,584	452,438
Product revenues	43,136	95,465	95,629	126,407
Total revenues	237,715	266,484	509,213	578,845
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	133,468	108,713	298,410	310,945
Product cost of revenues	44,231	83,560	89,019	109,835
Total cost of revenues	177,699	192,273	387,429	420,780
Selling, general and administrative expenses	33,193	32,698	64,571	65,582
Accretion of environmental liabilities	390	442	766	877
Depreciation and amortization	24,786	23,248	51,410	45,965
Income from operations	1,647	17,823	5,037	45,641
Other (expense) income	(532)	(594)	2,737	(789)
Interest (expense) income	14	179	(36)	106
Equity in earnings of subsidiaries	0	0		0
Intercompany dividend income	3,138	3,323	6,238	6,968
Intercompany interest income (expense)	(9,497)	(9,969)	(18,881)	(20,307)
Income before provision for income taxes	(5,230)	10,762	(4,905)	31,619
Provision (benefit) for income taxes	(1,307)	2,992	(1,226)	8,550
Net income (loss)	(3,923)	7,770	(3,679)	23,069
Other comprehensive income (loss)	(42,927)	18,685	(23,245)	30,457
Comprehensive income (loss)	(46,850)	26,455	(26,924)	53,526
Consolidating Adjustments
Revenues:
Service revenues	(5,572)	5,122	(8,356)	(2,910)
Product revenues	(1,598)	1,451	(2,394)	(813)
Total revenues	(7,170)	6,573	(10,750)	(3,723)
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	(5,572)	5,122	(8,356)	(2,910)
Product cost of revenues	(1,598)	1,451	(2,394)	(813)
Total cost of revenues	(7,170)	6,573	(10,750)	(3,723)
Selling, general and administrative expenses	0	0	0	0
Accretion of environmental liabilities	0	0		0
Depreciation and amortization	0	0	0	0
Income from operations	0	0	0	0
Other (expense) income	0	0		0
Interest (expense) income	0	0		0
Equity in earnings of subsidiaries	(57,829)	(59,669)	(96,400)	(111,303)
Intercompany dividend income	(3,138)	(3,323)	(6,238)	(6,968)
Intercompany interest income (expense)		0		0
Income before provision for income taxes	(60,967)	(62,992)	(102,638)	(118,271)
Provision (benefit) for income taxes		0		0
Net income (loss)	(60,967)	(62,992)	(102,638)	(118,271)
Other comprehensive income (loss)	6,871	16,821	28,714	28,910
Comprehensive income (loss)	$ (54,096)	$ (46,171)	$ (73,924)	$ (89,361)

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COMMITMENTS AND CONTINGENCIES (Details)	1 Months Ended	6 Months Ended				12 Months Ended					6 Months Ended	12 Months Ended	6 Months Ended
	Oct. 31, 2010 customer	Jun. 30, 2014 USD ($) claims Proceedings	Dec. 31, 2013 USD ($)	Jun. 30, 2014 Legal and Administrative Proceedings USD ($)	Dec. 31, 2013 Legal and Administrative Proceedings USD ($)	Dec. 31, 2012 Ville Mercier CAD	Dec. 31, 1999 Ville Mercier Municipalities	Dec. 31, 1968 Ville Mercier Permits	Jun. 30, 2014 Ville Mercier USD ($)	Dec. 31, 2013 Ville Mercier USD ($)	Jun. 30, 2014 Superfund Proceedings USD ($) sites facilties	Dec. 31, 2002 Wichita Property acre	Jun. 30, 2014 Certain Other Third Party Sites sites	Jun. 30, 2014 Safety-Kleen sites	Jun. 30, 2014 Federal and State Enforcement Actions [Member] USD ($) Proceedings	Dec. 31, 2013 Federal and State Enforcement Actions [Member] USD ($) Proceedings
Contingencies [Line Items]
Recorded reserves for actual or probable liabilities		$ 44,400,000	$ 41,700,000	$ 35,200,000											$ 9,200,000
Possible increase in legal and administrative proceedings				3,500,000	3,500,000
Number of permits issued by government, for dumping organic liquid								2
Number of neighboring municipalities filing separate legal proceedings against the Mercier Subsidiary and the Government of Quebec							3
General Damages Sought						2,900,000
Punitive Damages Sought						10,000,000
Accrued remedial liabilities		167,827,000	172,498,000						13,900,000	13,600,000
Number of pending personal injury claims allegedly resulting from the used of Safety-Kleen's products		64													3	5
Number of product liability claims settled or dismissed		8
Number of customers filing a complaint	2
Number of sites owned by third party excluded from cleanup or related liabilities											125
Number of sites owned by the entity subject to proceedings under federal or state superfund laws											2
Notices received from owners of third party sites seeking indemnification from the company											123
Number of sites for which environmental remediation expense is settled											29
Third party sites requiring expenditure on remediation											20
Number of sites not currently requiring expenditures on remediation											74
Minimum potential liability											$ 100,000				$ 100,000	$ 100,000
Number of sites which potential liability could exceed $100,000											15
State-designated superfund site acquired, total acres												1,400
Indemnification agreement with third party sites													11
Notices received from owners of third party sites seeking indemnification from the company											5			16

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GOODWILL AND OTHER INTANGIBLE ASSETS (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Goodwill [Line Items]
Goodwill	$ 578,974	$ 570,960
Oil Re-refining and Recycling
Goodwill [Line Items]
Percentage Fair Value Exceeded Carrying Value		10.00%
Goodwill	174,739	171,161
Oil and Gas Field Services
Goodwill [Line Items]
Percentage Fair Value Exceeded Carrying Value		10.00%
Goodwill	$ 36,400	$ 36,506

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UNAUDITED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock	Shares Held Under Employee Participation Plan	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Accumulated Earnings
Balance at Dec. 31, 2013	$ 1,475,639	$ 607	$ (469)	$ 898,165	$ (19,556)	$ 596,892
Balance (in shares) at Dec. 31, 2013		60,672,000
Increase (Decrease) in Stockholders' Equity
Net income	37,632					37,632
Other comprehensive loss	(5,469)				(5,469)
Stock-based compensation	4,340			4,340
Issuance of restricted shares, net of shares remitted	(2,215)	1		(2,216)
Issuance of restricted shares, net of shares remitted (in shares)		89,000
Repurchases of common stock	(16,219)	(3)		(16,216)
Repurchases of common stock (in shares)		(273,000)
Net tax benefit on exercise of stock-based awards	644			644
Employee stock purchase plan	4,364	1		4,363
Employee stock purchase plan (in shares)		91,000
Balance at Jun. 30, 2014	$ 1,498,716	$ 606	$ (469)	$ 889,080	$ (25,025)	$ 634,524
Balance (in shares) at Jun. 30, 2014		60,579,000

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SEGMENT REPORTING (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Segment Reporting Information [Line Items]
Total revenues	$ 858,480	$ 860,528	$ 1,705,147	$ 1,722,691
Third party revenues
Segment Reporting Information [Line Items]
Total revenues	858,480	860,528	1,705,147	1,722,691
Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	0	0	0	0
Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	0	0	0	0
Direct revenues
Segment Reporting Information [Line Items]
Total revenues	858,480	860,528	1,705,147	1,722,691
Technical Services | Third party revenues
Segment Reporting Information [Line Items]
Total revenues	256,798	256,262	493,579	490,201
Technical Services | Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	40,082	25,789	77,516	50,208
Technical Services | Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	778	1,339	1,177	2,191
Technical Services | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	297,658	283,390	572,272	542,600
Industrial and Field Services | Third party revenues
Segment Reporting Information [Line Items]
Total revenues	185,154	199,225	347,114	368,846
Industrial and Field Services | Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	(11,047)	(12,680)	(22,805)	(26,440)
Industrial and Field Services | Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	36	(128)	191	(106)
Industrial and Field Services | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	174,143	186,417	324,500	342,300
Oil Re-refining and Recycling | Third party revenues
Segment Reporting Information [Line Items]
Total revenues	144,016	123,008	272,937	263,092
Oil Re-refining and Recycling | Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	(54,861)	(48,261)	(102,977)	(98,287)
Oil Re-refining and Recycling | Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	(5)	0	(5)	0
Oil Re-refining and Recycling | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	89,150	74,747	169,955	164,805
SK Environmental Services | Third party revenues
Segment Reporting Information [Line Items]
Total revenues	171,324	166,523	332,712	326,325
SK Environmental Services | Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	23,307	32,207	43,264	67,077
SK Environmental Services | Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	0	0	(58)	84
SK Environmental Services | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	194,631	198,730	375,918	393,486
Lodging Services | Third party revenues
Segment Reporting Information [Line Items]
Total revenues	42,872	46,685	99,566	100,015
Lodging Services | Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	900	1,207	1,294	1,809
Lodging Services | Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	25	101	26	217
Lodging Services | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	43,797	47,993	100,886	102,041
Oil and Gas Field Services | Third party revenues
Segment Reporting Information [Line Items]
Total revenues	58,177	68,444	158,949	183,607
Oil and Gas Field Services | Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	1,619	1,738	3,708	5,633
Oil and Gas Field Services | Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	(22)	(49)	(10)	(200)
Oil and Gas Field Services | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	59,774	70,133	162,647	189,040
Corporate Items | Third party revenues
Segment Reporting Information [Line Items]
Total revenues	139	381	290	(9,395)
Corporate Items | Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	0	0	0	0
Corporate Items | Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	(812)	(1,263)	(1,321)	(2,186)
Corporate Items | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	$ (673)	$ (882)	$ (1,031)	$ (11,581)

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MARKETABLE SECURITIES (Details) (USD $)			3 Months Ended	6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014 Other Income	Jun. 30, 2014 Other Income
Investments, Debt and Equity Securities [Abstract]
Marketable securities	$ 0	$ 12,435,000
Gain (Loss) on Investments [Line Items]
Gain on marketable securities			$ 100,000	$ 3,400,000

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BUSINESS COMBINATIONS (Tables) (Evergreen Oil, Inc)

6 Months Ended

Jun. 30, 2014

Evergreen Oil, Inc

Business Acquisition [Line Items]

Summary of recognized amounts of identifiable assets acquired and liabilities assumed

The following table summarizes the recognized amounts of assets acquired and liabilities assumed at September 13, 2013 (in thousands):

	At acquisition date as reported at December 31, 2013			Measurement Period Adjustments			At acquisition date as reported at June 30, 2014
Inventories and supplies	$	1,089		$	—		$	1,089
Prepaid and other current assets	1,291			(273		)	1,018
Property, plant and equipment	40,563			—			40,563
Permits and other intangibles	17,100			—			17,100
Deferred tax assets, less current portion	2,368			(2,368		)	—
Other assets	3,607			(239		)	3,368
Current liabilities	(6,198		)	218			(5,980		)
Closure and post-closure liabilities	(659		)	—			(659		)
Remedial liabilities, less current portion	(2,103		)	463			(1,640		)
Deferred taxes, unrecognized tax benefits and other long-term liabilities	(1,139		)	(920		)	(2,059		)
Total identifiable net assets	55,919			(3,119		)	52,800
Goodwill	—			3,518			3,518
Total	$	55,919		$	399		$	56,318

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SIGNIFICANT ACCOUNTING POLICIES (Policies)

6 Months Ended

Jun. 30, 2014

Accounting Policies [Abstract]

Recent Accounting Pronouncements

Recent Accounting Pronouncements

Standards implemented

On January 1, 2014, the Company adopted the Financial Accounting Standards Board (“FASB”) Accounting Standard Update (“ASU”) 2013-11 Income Taxes (Topic 740) - Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists. This standard provides guidance regarding when an unrecognized tax benefit should be classified as a reduction to a deferred tax asset or when it should be classified as a liability in the consolidated balance sheet. The adoption of ASU 2013-11 did not have an impact on the Company's consolidated balance sheets.

Standards 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. This new guidance is effective for annual reporting periods (including interim reporting periods within those periods) beginning after December 15, 2016.    

In April 2014, FASB issued ASU 2014-08, Presentation of Financial Statements (Topic 205) and Property, Plant, and Equipment (Topic 360). The amendments in ASU 2014-08 provide guidance for the recognition and disclosure of discontinued operations. ASU 2014-08 is effective for fiscal years, and interim periods within those years, beginning after December 15, 2014.

The Company is currently evaluating the impact that the above standards to be implemented will have on the Company's consolidated financial statements.

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EARNINGS PER SHARE (Text) (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Outstanding Stock Awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from computation of earning per share (in shares)	228,000	171,000	228,000	171,000
Restricted Stock Awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from computation of earning per share (in shares)	5,270		5,270

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INVENTORIES AND SUPPLIES (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Inventory Disclosure [Abstract]
Oil and oil products	$ 62,563	$ 59,639
Supplies and drums	72,172	64,471
Solvent and solutions	9,639	10,100
Other	17,418	17,886
Total inventories and supplies	$ 161,792	$ 152,096

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INVENTORIES AND SUPPLIES (Tables)

6 Months Ended

Jun. 30, 2014

Inventory Disclosure [Abstract]

Schedule of Inventory

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

	June 30, 2014		December 31, 2013
Oil and oil products	$	62,563	$	59,639
Supplies and drums	72,172		64,471
Solvent and solutions	9,639		10,100
Other	17,418		17,886
Total inventories and supplies	$	161,792	$	152,096

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PROPERTY, PLANT AND EQUIPMENT (Tables)

6 Months Ended

Jun. 30, 2014

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

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

	June 30, 2014		December 31, 2013
Land	$	100,194	$	99,794
Asset retirement costs (non-landfill)	10,936		10,938
Landfill assets	105,569		100,983
Buildings and improvements	333,930		327,956
Camp equipment	186,622		187,831
Vehicles	459,594		425,296
Equipment	1,272,036		1,201,296
Furniture and fixtures	5,471		5,260
Construction in progress	64,259		58,010
	2,538,611		2,417,364
Less - accumulated depreciation and amortization	927,313		815,194
Total property, plant and equipment, net	$	1,611,298	$	1,602,170

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UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Cash flows from operating activities:
Net income	$ 37,632	$ 33,404
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	135,431	127,474
Pre-tax, non-cash acquisition accounting inventory adjustments	0	13,559
Allowance for doubtful accounts	4,605	3,618
Amortization of deferred financing costs and debt discount	1,576	1,692
Accretion of environmental liabilities	5,333	5,714
Changes in environmental liability estimates	(1,429)	(393)
Deferred income taxes	(1)	(8)
Stock-based compensation	4,340	3,924
Excess tax benefit of stock-based compensation	(644)	(1,326)
Income tax benefit related to stock option exercises	644	1,316
Other expense (income)	(3,523)	(2,180)
Environmental expenditures	(7,443)	(9,793)
Changes in assets and liabilities, net of acquisitions
Accounts receivable	(689)	(20,783)
Inventories and supplies	(9,556)	1,128
Other current assets	(17,574)	5,027
Accounts payable	(46,421)	(33,426)
Other current and long-term liabilities	12,663	8,665
Net cash from operating activities	114,944	137,612
Cash flows from investing activities:
Additions to property, plant and equipment	(138,186)	(141,466)
Proceeds from sales of fixed assets	2,986	2,194
Proceeds from sales of marketable securities	12,947	0
Acquisitions, net of cash acquired	(6,150)	0
Additions to intangible assets, including costs to obtain or renew permits	(2,891)	(2,169)
Net cash used in investing activities	(131,294)	(141,441)
Cash flows from financing activities:
Change in uncashed checks	3,162	40,356
Proceeds from exercise of stock options	0	399
Remittance of shares, net	(2,215)	(169)
Repurchases of common stock	(14,657)	0
Proceeds from employee stock purchase plan	4,364	3,391
Deferred financing costs paid	0	(2,446)
Repayment of long-term obligations	(5,000)	0
Payments on capital leases	(1,190)	(2,588)
Issuance costs related to 2012 issuance of common stock	0	(250)
Excess tax benefit of stock-based compensation	644	1,326
Net cash from financing activities	(14,892)	40,019
Effect of exchange rate change on cash	(187)	(2,548)
(Decrease) increase in cash and cash equivalents	(31,429)	33,642
Cash and cash equivalents, beginning of period	310,073	229,836
Cash and cash equivalents, end of period	278,644	263,478
Cash payments for interest and income taxes:
Interest paid	37,070	36,841
Income taxes paid	14,304	7,275
Non-cash investing and financing activities:
Payable for repurchased shares	1,562	0
Property, plant and equipment accrued	21,934	38,650
Transfer of inventory to property, plant and equipment	$ 0	$ 11,369

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GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)

6 Months Ended

Jun. 30, 2014

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of changes to goodwill

The changes to goodwill for the six months ended June 30, 2014 were as follows (in thousands):

	2014
Balance at January 1, 2014	$	570,960
Acquired from acquisitions	4,852
Increase from adjustments during the measurement period related to Evergreen	3,518
Foreign currency translation	(356		)
Balance at June 30, 2014	$	578,974

Summary of amortizable other intangible assets (finite-lived)

Below is a summary of amortizable other intangible assets (in thousands):

	June 30, 2014							December 31, 2013
	Cost		Accumulated Amortization		Net		Weighted Average Remaining Amortization Period (in years)	Cost		Accumulated Amortization		Net		Weighted Average Remaining Amortization Period (in years)
Permits	$	158,633	$	53,278	$	105,355	19.9	$	157,327	$	50,858	$	106,469	19.6
Customer and supplier relationships	377,686		66,925		310,761		11.4	377,899		52,814		325,085		12.1
Other intangible assets	30,787		17,842		12,945		3.1	29,299		15,518		13,781		3.3
Total amortizable permits and other intangible assets	567,106		138,045		429,061		11.7	564,525		119,190		445,335		12.2
Trademarks and trade names	124,597		—		124,597		Indefinite	124,638		—		124,638		Indefinite
Total permits and other intangible assets	$	691,703	$	138,045	$	553,658		$	689,163	$	119,190	$	569,973

Summary of amortizable other intangible assets (indefinite-lived)

Below is a summary of amortizable other intangible assets (in thousands):

	June 30, 2014							December 31, 2013
	Cost		Accumulated Amortization		Net		Weighted Average Remaining Amortization Period (in years)	Cost		Accumulated Amortization		Net		Weighted Average Remaining Amortization Period (in years)
Permits	$	158,633	$	53,278	$	105,355	19.9	$	157,327	$	50,858	$	106,469	19.6
Customer and supplier relationships	377,686		66,925		310,761		11.4	377,899		52,814		325,085		12.1
Other intangible assets	30,787		17,842		12,945		3.1	29,299		15,518		13,781		3.3
Total amortizable permits and other intangible assets	567,106		138,045		429,061		11.7	564,525		119,190		445,335		12.2
Trademarks and trade names	124,597		—		124,597		Indefinite	124,638		—		124,638		Indefinite
Total permits and other intangible assets	$	691,703	$	138,045	$	553,658		$	689,163	$	119,190	$	569,973

Schedule of expected amortization for the net carrying amount of finite lived intangible assets

Below is the expected future amortization of the net carrying amount of finite lived intangible assets at June 30, 2014 (in thousands):

Years Ending December 31,	Expected Amortization
2014 (six months)	$	17,932
2015	35,607
2016	34,789
2017	32,743
2018	30,038
Thereafter	277,952
	$	429,061

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SEGMENT REPORTING (Tables)

6 Months Ended

Jun. 30, 2014

Segment Reporting [Abstract]

Reconciliation of third party revenues to direct revenues

The following table reconciles third party revenues to direct revenues for the three and six months ended June 30, 2014 and 2013 (in thousands):

	For the Three Months Ended June 30, 2014											For the Six Months Ended June 30, 2014
	Third party revenues		Intersegment revenues, net			Corporate Items, net			Direct revenues			Third party revenues		Intersegment revenues, net			Corporate Items, net			Direct revenues
Technical Services	$	256,798	$	40,082		$	778		$	297,658		$	493,579	$	77,516		$	1,177		$	572,272
Industrial and Field Services	185,154		(11,047		)	36			174,143			347,114		(22,805		)	191			324,500
Oil Re-refining and Recycling	144,016		(54,861		)	(5		)	89,150			272,937		(102,977		)	(5		)	169,955
SK Environmental Services	171,324		23,307			—			194,631			332,712		43,264			(58		)	375,918
Lodging Services	42,872		900			25			43,797			99,566		1,294			26			100,886
Oil and Gas Field Services	58,177		1,619			(22		)	59,774			158,949		3,708			(10		)	162,647
Corporate Items	139		—			(812		)	(673		)	290		—			(1,321		)	(1,031		)
Total	$	858,480	$	—		$	—		$	858,480		$	1,705,147	$	—		$	—		$	1,705,147

	For the Three Months Ended June 30, 2013											For the Six Months Ended June 30, 2013
	Third party revenues		Intersegment revenues, net			Corporate Items, net			Direct revenues			Third party revenues			Intersegment revenues, net			Corporate Items, net			Direct revenues
Technical Services	$	256,262	$	25,789		$	1,339		$	283,390		$	490,201		$	50,208		$	2,191		$	542,600
Industrial and Field Services	199,225		(12,680		)	(128		)	186,417			368,846			(26,440		)	(106		)	342,300
Oil Re-refining and Recycling	123,008		(48,261		)	—			74,747			263,092			(98,287		)	—			164,805
SK Environmental Services	166,523		32,207			—			198,730			326,325			67,077			84			393,486
Lodging Services	46,685		1,207			101			47,993			100,015			1,809			217			102,041
Oil and Gas Field Services	68,444		1,738			(49		)	70,133			183,607			5,633			(200		)	189,040
Corporate Items	381		—			(1,263		)	(882		)	(9,395		)	—			(2,186		)	(11,581		)
Total	$	860,528	$	—		$	—		$	860,528		$	1,722,691		$	—		$	—		$	1,722,691

Reconciliation to consolidated statements of income to adjusted EBITDA

The following table presents Adjusted EBITDA information used by management for each reportable segment (in thousands). The Company does not allocate interest expense, income taxes, depreciation, amortization, accretion of environmental liabilities, pre-tax, non-cash acquisition accounting inventory adjustment, and other expense (income) to its segments.    

	For the Three Months Ended						For the Six Months Ended
	June 30,						June 30,
	2014			2013			2014			2013
Adjusted EBITDA:
Technical Services	$	84,297		$	69,390		$	146,474		$	129,435
Industrial and Field Services	30,716			34,760			47,088			48,572
Oil Re-refining and Recycling	15,196			12,752			27,779			28,098
SK Environmental Services	31,307			34,076			54,132			61,082
Lodging Services	15,487			19,259			33,224			41,560
Oil and Gas Field Services	1,812			4,144			18,143			31,928
Corporate Items	(43,016		)	(50,791		)	(89,055		)	(105,857		)
Total	$	135,799		$	123,590		$	237,785		$	234,818
Reconciliation to Consolidated Statements of Income:
Pre-tax, non-cash acquisition accounting inventory adjustment	—			—			—			13,559
Accretion of environmental liabilities	2,609			2,879			5,333			5,714
Depreciation and amortization	66,075			67,468			135,431			127,474
Income from operations	67,115			53,243			97,021			88,071
Other expense (income)	655			(1,655		)	(3,523		)	(2,180		)
Interest expense, net of interest income	19,382			19,585			38,936			39,458
Income before provision for income taxes	$	47,078		$	35,313		$	61,608		$	50,793

PP&E, intangible assets and total assets by segment

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

	June 30, 2014
	Technical Services		Industrial and Field Services		Oil Re-refining and Recycling		SK Environmental Services		Lodging Services		Oil and Gas Field Services		Corporate Items		Totals
Property, plant and equipment, net	$	408,977	$	260,083	$	208,630	$	245,513	$	156,730	$	229,017	$	102,348	$	1,611,298
Goodwill	50,432		109,785		174,739		172,223		35,395		36,400		—		578,974
Permits and other intangible, net	78,669		19,747		156,882		259,691		12,936		25,733		—		553,658
Total assets	$	751,444	$	416,912	$	670,797	$	742,795	$	237,671	$	390,314	$	722,510	$	3,932,443

	December 31, 2013
	Technical Services		Industrial and Field Services		Oil Re-refining and Recycling		SK Environmental Services		Lodging Services		Oil and Gas Field Services		Corporate Items		Totals
Property, plant and equipment, net	$	400,544	$	251,826	$	211,458	$	239,650	$	166,252	$	224,585	$	107,855	$	1,602,170
Goodwill	45,599		109,873		171,161		172,309		35,512		36,506		—		570,960
Permits and other intangible, net	80,302		21,147		160,807		265,106		14,730		27,881		—		569,973
Total assets	$	699,675	$	410,233	$	642,901	$	774,756	$	239,056	$	381,057	$	806,000	$	3,953,678

Total assets by geographical area

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

	June 30, 2014		December 31, 2013
United States	$	2,695,931	$	2,684,686
Canada	1,233,547		1,266,505
Other foreign	2,965		2,487
Total	$	3,932,443	$	3,953,678

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FINANCING ARRANGEMENTS (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014 Unsecured Debt Unsecured Senior Notes 2020	Dec. 31, 2013 Unsecured Debt Unsecured Senior Notes 2020	Jul. 30, 2012 Unsecured Debt Unsecured Senior Notes 2020	Jun. 30, 2014 Unsecured Debt Unsecured Senior Notes 2021	Dec. 31, 2013 Unsecured Debt Unsecured Senior Notes 2021	Dec. 07, 2012 Unsecured Debt Unsecured Senior Notes 2021
Financing arrangements
Senior unsecured notes			$ 800,000,000	$ 800,000,000		$ 595,000,000	$ 600,000,000
Long-term obligations	1,395,000,000	1,400,000,000
Senior unsecured notes principal amount					800,000,000			600,000,000
Stated interest rate			5.25%	5.25%	5.25%	5.125%	5.125%	5.125%
Long-term Debt, Fair Value			806,500,000	804,200,000		607,300,000	601,600,000
Revolving credit facility, maximum borrowing capacity	0	0
Line of credit facility available borrowing capacity	287,800,000	259,700,000
Letters of credit amount outstanding	$ 112,200,000	$ 140,300,000

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UNAUDITED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 278,644	$ 310,073
Marketable securities	0	12,435
Accounts receivable, net of allowances aggregating $21,446 and $18,106, respectively	575,187	579,394
Unbilled accounts receivable	35,529	26,568
Deferred costs	17,909	16,134
Inventories and supplies	161,792	152,096
Prepaid expenses and other current assets	48,991	41,962
Deferred tax assets	32,239	32,517
Total current assets	1,150,291	1,171,179
Property, plant and equipment, net	1,611,298	1,602,170
Other assets:
Deferred financing costs	19,284	20,860
Goodwill	578,974	570,960
Permits and other intangibles, net	553,658	569,973
Other	18,938	18,536
Total other assets	1,170,854	1,180,329
Total assets	3,932,443	3,953,678
Current liabilities:
Current portion of capital lease obligations	709	1,329
Accounts payable	262,553	316,462
Deferred revenue	61,593	55,454
Accrued expenses	245,368	236,829
Current portion of closure, post-closure and remedial liabilities	36,043	29,471
Total current liabilities	606,266	639,545
Other liabilities:
Closure and post-closure liabilities, less current portion of $6,252 and $5,884, respectively	43,630	41,201
Remedial liabilities, less current portion of $29,791 and $23,587, respectively	138,036	148,911
Long-term obligations	1,395,000	1,400,000
Capital lease obligations, less current portion	827	1,435
Deferred taxes, unrecognized tax benefits and other long-term liabilities	249,968	246,947
Total other liabilities	1,827,461	1,838,494
Common stock, $.01 par value:
Authorized 80,000,000; shares issued and outstanding 60,579,425 and 60,672,180 shares, respectively	606	607
Shares held under employee participation plan	(469)	(469)
Additional paid-in capital	889,080	898,165
Accumulated other comprehensive loss	(25,025)	(19,556)
Accumulated earnings	634,524	596,892
Total stockholders’ equity	1,498,716	1,475,639
Total liabilities and stockholders’ equity	$ 3,932,443	$ 3,953,678

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PROPERTY, PLANT AND EQUIPMENT (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 2,538,611	$ 2,417,364
Less - accumulated depreciation and amortization	927,313	815,194
Total property, plant and equipment, net	1,611,298	1,602,170
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	100,194	99,794
Asset retirement costs (non-landfill)
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	10,936	10,938
Landfill assets
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	105,569	100,983
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	333,930	327,956
Camp equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	186,622	187,831
Vehicles
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	459,594	425,296
Equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,272,036	1,201,296
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	5,471	5,260
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 64,259	$ 58,010

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UNAUDITED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 28,672	$ 22,902	$ 37,632	$ 33,404
Other comprehensive income (loss):
Unrealized (losses) gains on available-for-sale securities (net of taxes of $11, $22, $141 and $92 respectively)	(61)	(166)	799	(715)
Reclassification adjustment for gains on available-for-sale securities included in net income (net of taxes of $8, $0, $504 and $0 respectively)	(45)	0	(2,857)	0
Foreign currency translation adjustments	36,162	(35,340)	(3,411)	(58,652)
Other comprehensive income (loss)	36,056	(35,506)	(5,469)	(59,367)
Comprehensive income (loss)	$ 64,728	$ (12,604)	$ 32,163	$ (25,963)

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STOCK-BASED COMPENSATION (Details) (USD $)	3 Months Ended	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares	233,237	237,737
Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares	103,130	107,630
Weighted Average Grant-Date Fair Value (in dollars per share)	$ 61.85	$ 61.55
Performance stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares	130,107	130,107
Weighted Average Grant-Date Fair Value (in dollars per share)	$ 62.20	$ 62.20

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REMEDIAL LIABILITIES (Tables)

6 Months Ended

Jun. 30, 2014

Environmental Remediation Obligations [Abstract]

Changes to remedial liabilities

The changes to remedial liabilities for the six months ended June 30, 2014 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, 2014	$	5,624		$	74,262		$	92,612		$	172,498
Adjustments during the measurement period related to Evergreen	—			—			(518		)	(518		)
Accretion	133			1,534			1,467			3,134
Changes in estimates recorded to statement of income	(126		)	(2,467		)	1,068			(1,525		)
Expenditures	(57		)	(2,489		)	(3,131		)	(5,677		)
Currency translation and other	(10		)	7			(82		)	(85		)
Balance at June 30, 2014	$	5,564		$	70,847		$	91,416		$	167,827

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SEGMENT REPORTING (Details 4) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]
Total assets	$ 3,932,443	$ 3,953,678
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total assets	2,695,931	2,684,686
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Total assets	1,233,547	1,266,505
Other foreign
Revenues from External Customers and Long-Lived Assets [Line Items]
Total assets	$ 2,965	$ 2,487

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EARNINGS PER SHARE

6 Months Ended

Jun. 30, 2014

Earnings Per Share [Abstract]

EARNINGS PER SHARE

EARNINGS PER SHARE

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

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2014		2013		2014		2013
Numerator for basic and diluted earnings per share:
Net income	$	28,672	$	22,902	$	37,632	$	33,404
Denominator:
Basic shares outstanding	60,665		60,550		60,695		60,507
Dilutive effect of equity-based compensation awards	113		137		127		151
Dilutive shares outstanding	60,778		60,687		60,822		60,658
Basic earnings per share:	$	0.47	$	0.38	$	0.62	$	0.55
Diluted earnings per share:	$	0.47	$	0.38	$	0.62	$	0.55

For the three and six months ended June 30, 2014, the dilutive effect of all then outstanding options, restricted stock and performance awards is included in the EPS calculations above except for 228,000 of outstanding performance stock awards for which the performance criteria were not attained at that time and 5,270 restricted stock awards which were antidilutive at June 30, 2014. For the three and six months ended June 30, 2013, the EPS calculations above include the dilutive effects of all then outstanding options, restricted stock, and performance awards except for 171,000 of outstanding performance stock awards for which the performance criteria were not attained at that time.

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FINANCING ARRANGEMENTS (Tables)

6 Months Ended

Jun. 30, 2014

Debt Disclosure [Abstract]

Summary of the entity's financial arrangements

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

	June 30, 2014		December 31, 2013
Senior unsecured notes, at 5.25%, due August 1, 2020	$	800,000	$	800,000
Senior unsecured notes, at 5.125%, due June 1, 2021	595,000		600,000
Long-term obligations	$	1,395,000	$	1,400,000

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STOCK-BASED COMPENSATION

6 Months Ended

Jun. 30, 2014

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

STOCK-BASED COMPENSATION

STOCK-BASED COMPENSATION

Stock Option Awards

The following table summarizes the total number and type of awards granted during the three and six months ended June 30, 2014, as well as the related weighted-average grant-date fair values:

	Three Months Ended			Six Months Ended
	June 30, 2014			June 30, 2014
	Shares	Weighted Average Grant-Date Fair Value		Shares	Weighted Average Grant-Date Fair Value
Restricted stock awards	103,130	$	61.85	107,630	$	61.55
Performance stock awards	130,107	$	62.20	130,107	$	62.20
Total awards	233,237			237,737

Restricted stock awards issued during the three and six months ended June 30, 2014 carry terms which are consistent with historical grants. For the performance stock awards granted during the three and six months ended June 30, 2014, the Compensation Committee of the Company's Board of Directors established two-year performance targets which could potentially be achieved in either 2014 or 2015.

Common Stock Repurchases

On February 25, 2014, the Company's Board of Directors authorized the repurchase of up to $150 million of the Company's common stock. As of June 30, 2014, we had repurchased and retired a total of approximately 273,000 shares of our common stock for approximately $16.2 million under this program. As of June 30, 2014, an additional $133.8 million remains available for repurchase of shares under the current authorized program.

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GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION (Condensed Consolidating Statements of Cash Flows) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Condensed consolidating statement of cash flows
Net cash from operating activities	$ 114,944	$ 137,612
Cash flows from investing activities:
Additions to property, plant and equipment	(138,186)	(141,466)
Proceeds from sales of fixed assets	2,986	2,194
Acquisitions, net of cash acquired	(6,150)	0
Costs to obtain or renew permits	(2,891)	(2,169)
Proceeds from sales of marketable securities	12,947	0
Net cash used in investing activities	(131,294)	(141,441)
Cash flows from financing activities:
Change in uncashed checks	3,162	40,356
Proceeds from exercise of stock options	0	399
Proceeds from employee stock purchase plan	4,364	3,391
Remittance of shares, net	(2,215)	(169)
Repurchases of common stock	(14,657)	0
Excess tax benefit of stock-based compensation	644	1,326
Deferred financing costs paid	0	(2,446)
Payments on capital leases	(1,190)	(2,588)
Repayment of long-term obligations	(5,000)	0
Issuance costs related to 2012 issuance of common stock	0	(250)
Dividends (paid) / received	0	0
Interest received / (payments)	0	0
Net cash from financing activities	(14,892)	40,019
Effect of exchange rate change on cash	(187)	(2,548)
(Decrease) increase in cash and cash equivalents	(31,429)	33,642
Cash and cash equivalents, beginning of period	310,073	229,836
Cash and cash equivalents, end of period	278,644	263,478
Clean Harbors, Inc.
Condensed consolidating statement of cash flows
Net cash from operating activities	16,864	(36,459)
Cash flows from 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
Costs to obtain or renew permits	0	0
Proceeds from sales of marketable securities	0
Net cash used in investing activities	0	0
Cash flows from financing activities:
Change in uncashed checks	0	0
Proceeds from exercise of stock options		399
Proceeds from employee stock purchase plan	4,364	3,391
Remittance of shares, net	(2,215)	(169)
Repurchases of common stock	(14,657)
Excess tax benefit of stock-based compensation	644	1,326
Deferred financing costs paid		(2,446)
Payments on capital leases	0	0
Repayment of long-term obligations	(5,000)
Issuance costs related to 2012 issuance of common stock		(250)
Dividends (paid) / received	0	0
Interest received / (payments)	0	0
Net cash from financing activities	(16,864)	2,251
Effect of exchange rate change on cash	0	0
(Decrease) increase in cash and cash equivalents	0	(34,208)
Cash and cash equivalents, beginning of period	1,006	35,214
Cash and cash equivalents, end of period	1,006	1,006
U.S. Guarantor Subsidiaries
Condensed consolidating statement of cash flows
Net cash from operating activities	35,046	84,226
Cash flows from investing activities:
Additions to property, plant and equipment	(90,515)	(62,818)
Proceeds from sales of fixed assets	1,015	803
Acquisitions, net of cash acquired	(6,150)	0
Costs to obtain or renew permits	(477)	(212)
Proceeds from sales of marketable securities	0
Net cash used in investing activities	(96,127)	(62,227)
Cash flows from financing activities:
Change in uncashed checks	4,595	37,118
Proceeds from exercise of stock options		0
Proceeds from employee stock purchase plan	0	0
Remittance of shares, net	0	0
Repurchases of common stock	0
Excess tax benefit of stock-based compensation	0	0
Deferred financing costs paid		0
Payments on capital leases	(87)	(164)
Repayment of long-term obligations	0
Issuance costs related to 2012 issuance of common stock		0
Dividends (paid) / received	(7,412)	(6,989)
Interest received / (payments)	22,361	21,780
Net cash from financing activities	19,457	51,745
Effect of exchange rate change on cash	0	0
(Decrease) increase in cash and cash equivalents	(41,624)	73,744
Cash and cash equivalents, beginning of period	235,445	140,683
Cash and cash equivalents, end of period	193,821	214,427
Foreign Non-Guarantor Subsidiaries
Condensed consolidating statement of cash flows
Net cash from operating activities	63,034	89,845
Cash flows from investing activities:
Additions to property, plant and equipment	(47,671)	(78,648)
Proceeds from sales of fixed assets	1,971	1,391
Acquisitions, net of cash acquired	0	0
Costs to obtain or renew permits	(2,414)	(1,957)
Proceeds from sales of marketable securities	12,947
Net cash used in investing activities	(35,167)	(79,214)
Cash flows from financing activities:
Change in uncashed checks	(1,433)	3,238
Proceeds from exercise of stock options		0
Proceeds from employee stock purchase plan	0	0
Remittance of shares, net	0	0
Repurchases of common stock	0
Excess tax benefit of stock-based compensation	0	0
Deferred financing costs paid		0
Payments on capital leases	(1,103)	(2,424)
Repayment of long-term obligations	0
Issuance costs related to 2012 issuance of common stock		0
Dividends (paid) / received	7,412	6,989
Interest received / (payments)	(22,361)	(21,780)
Net cash from financing activities	(17,485)	(13,977)
Effect of exchange rate change on cash	(187)	(2,548)
(Decrease) increase in cash and cash equivalents	10,195	(5,894)
Cash and cash equivalents, beginning of period	73,622	53,939
Cash and cash equivalents, end of period	$ 83,817	$ 48,045

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UNAUDITED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Statement of Comprehensive Income [Abstract]
Change in fair value of available for sale securities, tax	$ 11	$ 22	$ (141)	$ 92
Reclassification adjustment for gains on available-for-sale securities included in net income, taxes	$ 8	$ 0	$ 504	$ 0

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UNAUDITED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Statement of Financial Position [Abstract]
Allowance for doubtful accounts receivable, current portion	$ 21,446	$ 18,106
Closure and post-closure liabilities, current portion	6,252	5,884
Remedial liabilities, current portion	$ 29,791	$ 23,587
Common Stock, Par or Stated Value Per Share (in USD per share)	$ 0.01	$ 0.01
Common Stock, Shares Authorized	80,000,000	80,000,000
Common Stock, Shares, Issued	60,579,425	60,672,180
Common Stock, Shares, Outstanding	60,579,425	60,672,180

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ACCRUED EXPENSES

6 Months Ended

Jun. 30, 2014

Payables and Accruals [Abstract]

ACCRUED EXPENSES

ACCRUED EXPENSES

Accrued expenses consisted of the following (in thousands):

	June 30, 2014		December 31, 2013
Insurance	$	62,969	$	57,993
Interest	20,666		20,731
Accrued compensation and benefits	62,032		60,902
Income, real estate, sales and other taxes	46,838		38,938
Other	52,863		58,265
Total accrued expenses	$	245,368	$	236,829

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DOCUMENT AND ENTITY INFORMATION	6 Months Ended
	Jun. 30, 2014	Aug. 04, 2014
Document and Entity Information [Abstract]
Entity Registrant Name	CLEAN HARBORS INC
Entity Central Index Key	0000822818
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Jun. 30, 2014
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		60,640,103

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CLOSURE AND POST-CLOSURE LIABILITIES

6 Months Ended

Jun. 30, 2014

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”) for the six months ended June 30, 2014 were as follows (in thousands):

	Landfill Retirement Liability			Non-Landfill Retirement Liability			Total
Balance at January 1, 2014	$	27,604		$	19,481		$	47,085
New asset retirement obligations	1,914			—			1,914
Accretion	1,278			921			2,199
Changes in estimates recorded to statement of income	(142		)	238			96
Changes in estimates recorded to balance sheet	363			—			363
Expenditures	(1,322		)	(444		)	(1,766		)
Currency translation and other	1			(10		)	(9		)
Balance at June 30, 2014	$	29,696		$	20,186		$	49,882

All of the landfill facilities included in the above were active as of June 30, 2014. New asset retirement obligations incurred during the first six months of 2014 were discounted at the credit-adjusted risk-free rate of 6.54%. There were no significant charges (benefits) in 2014 resulting from changes in estimates for closure and post-closure liabilities.

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UNAUDITED CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Revenues:
Service revenues	$ 665,275	$ 673,872	$ 1,325,370	$ 1,346,494
Product revenues	193,205	186,656	379,777	376,197
Total revenues	858,480	860,528	1,705,147	1,722,691
Cost of revenues (exclusive of items shown separately below)
Service revenues	445,757	455,603	912,556	923,975
Product revenues	161,193	158,723	320,113	326,375
Total cost of revenues	606,950	614,326	1,232,669	1,250,350
Selling, general and administrative expenses	115,731	122,612	234,693	251,082
Accretion of environmental liabilities	2,609	2,879	5,333	5,714
Depreciation and amortization	66,075	67,468	135,431	127,474
Income from operations	67,115	53,243	97,021	88,071
Other (expense) income	(655)	1,655	3,523	2,180
Interest expense, net of interest income of $211, $155, $416 and $266, respectively	(19,382)	(19,585)	(38,936)	(39,458)
Income before provision for income taxes	47,078	35,313	61,608	50,793
Provision for income taxes	18,406	12,411	23,976	17,389
Net income	$ 28,672	$ 22,902	$ 37,632	$ 33,404
Earnings per share:
Basic (in USD per share)	$ 0.47	$ 0.38	$ 0.62	$ 0.55
Diluted (in USD per share)	$ 0.47	$ 0.38	$ 0.62	$ 0.55
Shares used to compute earnings per share - Basic	60,665	60,550	60,695	60,507
Shares used to compute earnings per share - Diluted	60,778	60,687	60,822	60,658

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BUSINESS COMBINATIONS

6 Months Ended

Jun. 30, 2014

Business Combinations [Abstract]

BUSINESS COMBINATIONS

BUSINESS COMBINATIONS

Evergreen

On September 13, 2013, the Company acquired 100% of the outstanding common shares of Evergreen Oil, Inc. (“Evergreen”) for a final purchase price of $56.3 million in cash, net of cash acquired. Evergreen, headquartered in Irvine, California, specializes in the recovery and re-refining of used oil. Evergreen owns and operates one of the only oil re-refining operations in the western United States and also offers other ancillary environmental services, including parts cleaning and containerized waste services, vacuum services and hazardous waste management services. The acquisition of Evergreen enables the Company to further penetrate the small quantity waste generator market and further expand its oil re-refining, oil recycling and waste treatment capabilities. Financial information and results of Evergreen have been recorded in our consolidated financial statements since acquisition and are primarily included in the Oil Re-refining and Recycling segment.

Management determined the purchase price allocations based on estimates of the fair values of all tangible and intangible assets acquired and liabilities assumed. The Company believes that such information provides a reasonable basis for estimating the fair values of assets acquired and liabilities assumed. As of June 30, 2014, the Company has finalized the purchase accounting for the acquisition of Evergreen, except for environmental liabilities and taxes. The impact of the purchase price measurement period adjustments and related tax impacts recorded in the current period was not material to the consolidated financial statements and accordingly, the effects have not been retrospectively applied.

The following table summarizes the recognized amounts of assets acquired and liabilities assumed at September 13, 2013 (in thousands):

	At acquisition date as reported at December 31, 2013			Measurement Period Adjustments			At acquisition date as reported at June 30, 2014
Inventories and supplies	$	1,089		$	—		$	1,089
Prepaid and other current assets	1,291			(273		)	1,018
Property, plant and equipment	40,563			—			40,563
Permits and other intangibles	17,100			—			17,100
Deferred tax assets, less current portion	2,368			(2,368		)	—
Other assets	3,607			(239		)	3,368
Current liabilities	(6,198		)	218			(5,980		)
Closure and post-closure liabilities	(659		)	—			(659		)
Remedial liabilities, less current portion	(2,103		)	463			(1,640		)
Deferred taxes, unrecognized tax benefits and other long-term liabilities	(1,139		)	(920		)	(2,059		)
Total identifiable net assets	55,919			(3,119		)	52,800
Goodwill	—			3,518			3,518
Total	$	55,919		$	399		$	56,318

2014 Acquisitions

On May 30, 2014 the Company acquired certain assets of a privately owned U.S. company which provides carbon treatment systems and rental remediation equipment for approximately $6.2 million in cash. The purchase price is subject to customary post-closing adjustments based upon finalized working capital amounts. The acquired company has been integrated into the Technical Services segment.

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SIGNIFICANT ACCOUNTING POLICIES

6 Months Ended

Jun. 30, 2014

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, 2013. There have been no material changes in these policies or their application.

Recent Accounting Pronouncements

Standards implemented

On January 1, 2014, the Company adopted the Financial Accounting Standards Board (“FASB”) Accounting Standard Update (“ASU”) 2013-11 Income Taxes (Topic 740) - Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists. This standard provides guidance regarding when an unrecognized tax benefit should be classified as a reduction to a deferred tax asset or when it should be classified as a liability in the consolidated balance sheet. The adoption of ASU 2013-11 did not have an impact on the Company's consolidated balance sheets.

Standards 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. This new guidance is effective for annual reporting periods (including interim reporting periods within those periods) beginning after December 15, 2016.    

In April 2014, FASB issued ASU 2014-08, Presentation of Financial Statements (Topic 205) and Property, Plant, and Equipment (Topic 360). The amendments in ASU 2014-08 provide guidance for the recognition and disclosure of discontinued operations. ASU 2014-08 is effective for fiscal years, and interim periods within those years, beginning after December 15, 2014.

The Company is currently evaluating the impact that the above standards to be implemented will have on the Company's consolidated financial statements.

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ACCUMULATED OTHER COMPREHENSIVE LOSS

6 Months Ended

Jun. 30, 2014

Equity [Abstract]

Accumulated Other Comprehensive Loss

ACCUMULATED OTHER COMPREHENSIVE LOSS

The changes in accumulated other comprehensive loss by component and related tax effects for the six months ended June 30, 2014 were as follows (in thousands):    

	Foreign Currency Translation			Unrealized (Losses) Gains on Available-For-Sale Securities			Unfunded Pension Liability			Total
Balance at January 1, 2014	$	(20,164	)	$	1,904		$	(1,296	)	$	(19,556	)
Other comprehensive (loss) gain before reclassifications	(3,411		)	940			—			(2,471		)
Amounts reclassified out of accumulated other comprehensive loss	—			(3,361		)	—			(3,361		)
Tax effects	—			363			—			363
Other comprehensive loss	$	(3,411	)	$	(2,058	)	$	—		$	(5,469	)
Balance at June 30, 2014	$	(23,575	)	$	(154	)	$	(1,296	)	$	(25,025	)

The amounts reclassified out of accumulated other comprehensive loss into the consolidated statement of income, with presentation location during the six months ended June 30, 2014 were as follows (in thousands):

	For the Three Months Ended		For the Six Months Ended
Comprehensive Loss Components	June 30, 2014		June 30, 2014		Location
Unrealized gains on available-for-sale investments	$	53	$	3,361	Other (expense) income

There were no reclassifications out of accumulated other comprehensive loss into the consolidated statement of income during the three and six months ended June 30, 2013.

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REMEDIAL LIABILITIES

6 Months Ended

Jun. 30, 2014

Environmental Remediation Obligations [Abstract]

REMEDIAL LIABILITIES

REMEDIAL LIABILITIES

The changes to remedial liabilities for the six months ended June 30, 2014 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, 2014	$	5,624		$	74,262		$	92,612		$	172,498
Adjustments during the measurement period related to Evergreen	—			—			(518		)	(518		)
Accretion	133			1,534			1,467			3,134
Changes in estimates recorded to statement of income	(126		)	(2,467		)	1,068			(1,525		)
Expenditures	(57		)	(2,489		)	(3,131		)	(5,677		)
Currency translation and other	(10		)	7			(82		)	(85		)
Balance at June 30, 2014	$	5,564		$	70,847		$	91,416		$	167,827

In the six months ended June 30, 2014, the reduction in changes in estimates recorded to the statement of income was $1.5 million and primarily related to estimated cost adjustments for remediation across various sites.

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PROPERTY, PLANT AND EQUIPMENT

6 Months Ended

Jun. 30, 2014

Property, Plant and Equipment [Abstract]

PROPERTY, PLANT AND EQUIPMENT

PROPERTY, PLANT AND EQUIPMENT

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

	June 30, 2014		December 31, 2013
Land	$	100,194	$	99,794
Asset retirement costs (non-landfill)	10,936		10,938
Landfill assets	105,569		100,983
Buildings and improvements	333,930		327,956
Camp equipment	186,622		187,831
Vehicles	459,594		425,296
Equipment	1,272,036		1,201,296
Furniture and fixtures	5,471		5,260
Construction in progress	64,259		58,010
	2,538,611		2,417,364
Less - accumulated depreciation and amortization	927,313		815,194
Total property, plant and equipment, net	$	1,611,298	$	1,602,170

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STOCK-BASED COMPENSATION STOCK-BASED COMPENSATION (Narrative) (Details) (USD $)	6 Months Ended
	Jun. 30, 2014	Feb. 25, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase program, authorized amount		$ 150,000,000
Repurchases of common stock	16,219,000
Stock repurchase program, remaining authorized repurchase amount	133,800,000
Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Repurchases of common stock (in shares)	273,000
Repurchases of common stock	3,000
Additional Paid-in Capital
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Repurchases of common stock	$ 16,216,000

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MARKETABLE SECURITIES

6 Months Ended

Jun. 30, 2014

Investments, Debt and Equity Securities [Abstract]

Marketable Securities

MARKETABLE SECURITIES

The Company classifies its marketable securities as available-for-sale and, accordingly, carries such securities at fair value based upon readily available quoted market prices of the securities. Unrealized gains and losses are reported, net of tax, as a component of other comprehensive income. On June 30, 2014 the Company did not hold any marketable securities. On December 31, 2013, marketable securities held by the Company were recorded at $12.4 million. Marketable securities were classified as Level 1 in the fair value hierarchy.

During the three and six months ended June 30, 2014 the Company sold marketable securities and recognized a gain of $0.1 million and $3.4 million, respectively, recorded as other income in the consolidated statement of income. There were no realized gains or losses from the sale of marketable securities in the three and six months ended June 30, 2013.

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INVENTORIES AND SUPPLIES

6 Months Ended

Jun. 30, 2014

Inventory Disclosure [Abstract]

INVENTORIES AND SUPPLIES

INVENTORIES AND SUPPLIES

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

	June 30, 2014		December 31, 2013
Oil and oil products	$	62,563	$	59,639
Supplies and drums	72,172		64,471
Solvent and solutions	9,639		10,100
Other	17,418		17,886
Total inventories and supplies	$	161,792	$	152,096

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GOODWILL AND OTHER INTANGIBLE ASSETS

6 Months Ended

Jun. 30, 2014

Goodwill and Intangible Assets Disclosure [Abstract]

GOODWILL AND OTHER INTANGIBLE ASSETS

GOODWILL AND OTHER INTANGIBLE ASSETS

The changes to goodwill for the six months ended June 30, 2014 were as follows (in thousands):

	2014
Balance at January 1, 2014	$	570,960
Acquired from acquisitions	4,852
Increase from adjustments during the measurement period related to Evergreen	3,518
Foreign currency translation	(356		)
Balance at June 30, 2014	$	578,974

The Company assesses goodwill for impairment on an annual basis as of December 31, or 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, 2013 and determined that no adjustment to the carrying value of goodwill for any reporting unit was necessary because the fair values of the reporting units exceeded their respective carrying values.

The fair value of the Oil Re-refining and Recycling reporting unit exceeded the carrying value by less than 10% at December 31, 2013. During the first six months of fiscal 2014 the reporting unit has experienced lower than anticipated financial results primarily due to lower sales mix between base oils and higher priced blended oils as well as higher utilities and shutdown related costs. The lower sales prices reflected general economic conditions in the oil industry during the period. The financial performance of this reporting unit, which had a goodwill balance of approximately $174.7 million at June 30, 2014, is affected by fluctuations in oil prices overall market supply of refined oil and sales mix.

The fair value of the Oil and Gas Field Services reporting unit exceeded its carrying value by more than 10% at December 31, 2013. The financial performance of this reporting unit, which had a goodwill balance of approximately $36.4 million at June 30, 2014, was affected in the six months ended June 30, 2014 by pricing pressures and lower levels of overall activity in the markets and regions that the business serves.

Significant judgments are inherent in the annual impairment tests performed and include assumptions about the amount and timing of expected future cash flows, growth rates, and the determination of appropriate discount rates. The Company believes that the assumptions used in its annual impairment analysis are reasonable, but variations in any of the assumptions may result in different calculations of fair values that could result in a material impairment charge. The annual impairment tests performed as of December 31, 2013 utilized future annual budgeted amounts and discount rate assumptions based on an assessment of the Company's weighted average cost of capital as well as other significant assumptions believed to be reasonable at that time.

During the interim periods of fiscal year 2014 and with respect to the Oil Re-Refining and Recycling and Oil and Gas Field Services reporting units, the Company has considered whether (i) the lower than anticipated results (ii) general economic and industry conditions, and (iii) reporting unit specific factors would more likely than not reduce the estimated fair values of its reporting units below their carrying values. The Company has not performed an interim test for impairment of goodwill for any of its reporting units as it does not believe the factors impacting the performance of the reporting units through June 30, 2014 would more likely than not reduce the fair value below carrying value.

The performance of the Oil Re-Refining and Recycling and Oil and Gas Field Services reporting units will continue to be monitored. If these reporting units do not achieve the financial performance that the Company expects, it is possible that a goodwill impairment charge may result. There can be no assurance that future events will not result in an impairment of goodwill.

Below is a summary of amortizable other intangible assets (in thousands):

	June 30, 2014							December 31, 2013
	Cost		Accumulated Amortization		Net		Weighted Average Remaining Amortization Period (in years)	Cost		Accumulated Amortization		Net		Weighted Average Remaining Amortization Period (in years)
Permits	$	158,633	$	53,278	$	105,355	19.9	$	157,327	$	50,858	$	106,469	19.6
Customer and supplier relationships	377,686		66,925		310,761		11.4	377,899		52,814		325,085		12.1
Other intangible assets	30,787		17,842		12,945		3.1	29,299		15,518		13,781		3.3
Total amortizable permits and other intangible assets	567,106		138,045		429,061		11.7	564,525		119,190		445,335		12.2
Trademarks and trade names	124,597		—		124,597		Indefinite	124,638		—		124,638		Indefinite
Total permits and other intangible assets	$	691,703	$	138,045	$	553,658		$	689,163	$	119,190	$	569,973

Amortization expense for the three and six months ended June 30, 2014 was $8.9 million and $18.4 million, respectively. Amortization expense for the three and six months ended June 30, 2013 was $8.8 million and $17.1 million, respectively.

Below is the expected future amortization of the net carrying amount of finite lived intangible assets at June 30, 2014 (in thousands):

Years Ending December 31,	Expected Amortization
2014 (six months)	$	17,932
2015	35,607
2016	34,789
2017	32,743
2018	30,038
Thereafter	277,952
	$	429,061

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SEGMENT REPORTING (Details 3) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Property, plant and equipment, net	$ 1,611,298	$ 1,602,170
Goodwill	578,974	570,960
Permits and other intangible, net	553,658	569,973
Total assets	3,932,443	3,953,678
Technical Services
Segment Reporting Information [Line Items]
Property, plant and equipment, net	408,977	400,544
Goodwill	50,432	45,599
Permits and other intangible, net	78,669	80,302
Total assets	751,444	699,675
Industrial and Field Services
Segment Reporting Information [Line Items]
Property, plant and equipment, net	260,083	251,826
Goodwill	109,785	109,873
Permits and other intangible, net	19,747	21,147
Total assets	416,912	410,233
Oil Re-refining and Recycling
Segment Reporting Information [Line Items]
Property, plant and equipment, net	208,630	211,458
Goodwill	174,739	171,161
Permits and other intangible, net	156,882	160,807
Total assets	670,797	642,901
SK Environmental Services
Segment Reporting Information [Line Items]
Property, plant and equipment, net	245,513	239,650
Goodwill	172,223	172,309
Permits and other intangible, net	259,691	265,106
Total assets	742,795	774,756
Lodging Services
Segment Reporting Information [Line Items]
Property, plant and equipment, net	156,730	166,252
Goodwill	35,395	35,512
Permits and other intangible, net	12,936	14,730
Total assets	237,671	239,056
Oil and Gas Field Services
Segment Reporting Information [Line Items]
Property, plant and equipment, net	229,017	224,585
Goodwill	36,400	36,506
Permits and other intangible, net	25,733	27,881
Total assets	390,314	381,057
Corporate Items
Segment Reporting Information [Line Items]
Property, plant and equipment, net	102,348	107,855
Goodwill	0	0
Permits and other intangible, net	0	0
Total assets	$ 722,510	$ 806,000

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GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION (Condensed Consolidating Balance Sheets) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2012
ASSETS
Cash and cash equivalents	$ 278,644	$ 310,073	$ 263,478	$ 229,836
Intercompany receivables	0	0
Accounts receivable, net	575,187	579,394
Other current assets	296,460	281,712
Property, plant and equipment, net	1,611,298	1,602,170
Investments in subsidiaries	0	0
Intercompany debt receivable	0	0
Goodwill	578,974	570,960
Permits and other intangibles, net	553,658	569,973
Other long-term assets	38,222	39,396
Total assets	3,932,443	3,953,678
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities	606,266	639,545
Intercompany payables	0	0
Closure, post-closure and remedial liabilities, net	181,666	190,112
Long-term obligations	1,395,000	1,400,000
Capital lease obligations, net	827	1,435
Intercompany debt payable	0	0
Other long-term liabilities	249,968	246,947
Total liabilities	2,433,727	2,478,039
Stockholders’ equity	1,498,716	1,475,639
Total liabilities and stockholders’ equity	3,932,443	3,953,678
Clean Harbors, Inc.
ASSETS
Cash and cash equivalents	1,006	1,006	1,006	35,214
Intercompany receivables	237,556	269,580
Accounts receivable, net	0	0
Other current assets	24,087	24,087
Property, plant and equipment, net	0	0
Investments in subsidiaries	2,762,237	2,683,158
Intercompany debt receivable	0	0
Goodwill		0
Permits and other intangibles, net		0
Other long-term assets	25,457	23,770
Total assets	3,050,343	3,001,601
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities	61,029	33,626
Intercompany payables	0	0
Closure, post-closure and remedial liabilities, net	0	0
Long-term obligations	1,395,000	1,400,000
Capital lease obligations, net	0	0
Intercompany debt payable	3,701	3,701
Other long-term liabilities	91,897	88,635
Total liabilities	1,551,627	1,525,962
Stockholders’ equity	1,498,716	1,475,639
Total liabilities and stockholders’ equity	3,050,343	3,001,601
U.S. Guarantor Subsidiaries
ASSETS
Cash and cash equivalents	193,821	235,445	214,427	140,683
Intercompany receivables	2,446	2,448
Accounts receivable, net	399,423	387,006
Other current assets	194,211	182,881
Property, plant and equipment, net	961,240	945,280
Investments in subsidiaries	760,718	967,186
Intercompany debt receivable	379,428	493,402
Goodwill	424,057	415,541
Permits and other intangibles, net	447,638	458,917
Other long-term assets	3,759	7,018
Total assets	3,766,741	4,095,124
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities	429,490	466,454
Intercompany payables	321,533	499,749
Closure, post-closure and remedial liabilities, net	150,250	158,298
Long-term obligations	0	0
Capital lease obligations, net	129	191
Intercompany debt payable	0	0
Other long-term liabilities	103,102	103,125
Total liabilities	1,004,504	1,227,817
Stockholders’ equity	2,762,237	2,867,307
Total liabilities and stockholders’ equity	3,766,741	4,095,124
Foreign Non-Guarantor Subsidiaries
ASSETS
Cash and cash equivalents	83,817	73,622	48,045	53,939
Intercompany receivables	84,029	230,224
Accounts receivable, net	175,764	192,388
Other current assets	78,162	74,744
Property, plant and equipment, net	650,058	656,890
Investments in subsidiaries	0	144,953
Intercompany debt receivable	3,701	3,701
Goodwill	154,917	155,419
Permits and other intangibles, net	106,020	111,056
Other long-term assets	9,006	8,608
Total assets	1,345,474	1,651,605
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities	115,747	139,465
Intercompany payables	2,498	2,503
Closure, post-closure and remedial liabilities, net	31,416	31,814
Long-term obligations	0	0
Capital lease obligations, net	698	1,244
Intercompany debt payable	379,428	493,402
Other long-term liabilities	54,969	55,187
Total liabilities	584,756	723,615
Stockholders’ equity	760,718	927,990
Total liabilities and stockholders’ equity	1,345,474	1,651,605
Consolidating Adjustments
ASSETS
Cash and cash equivalents	0	0
Intercompany receivables	(324,031)	(502,252)
Accounts receivable, net		0
Other current assets	0	0
Property, plant and equipment, net	0	0
Investments in subsidiaries	(3,522,955)	(3,795,297)
Intercompany debt receivable	(383,129)	(497,103)
Goodwill		0
Permits and other intangibles, net		0
Other long-term assets	0	0
Total assets	(4,230,115)	(4,794,652)
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities	0	0
Intercompany payables	(324,031)	(502,252)
Closure, post-closure and remedial liabilities, net	0	0
Long-term obligations	0	0
Capital lease obligations, net	0	0
Intercompany debt payable	(383,129)	(497,103)
Other long-term liabilities	0	0
Total liabilities	(707,160)	(999,355)
Stockholders’ equity	(3,522,955)	(3,795,297)
Total liabilities and stockholders’ equity	$ (4,230,115)	$ (4,794,652)

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SEGMENT REPORTING (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 segment	Jun. 30, 2013
Segment reporting information
Number of reportable segments			6
Number of operations for which the revenues are insignificant			2
Adjusted EBITDA, Total	$ 135,799	$ 123,590	$ 237,785	$ 234,818
Reconciliation to Consolidated Statements of Income:
Pre-tax, non-cash acquisition accounting inventory adjustment	0	0	0	13,559
Accretion of environmental liabilities	2,609	2,879	5,333	5,714
Depreciation and amortization	66,075	67,468	135,431	127,474
Income from operations	67,115	53,243	97,021	88,071
Other expense (income)	655	(1,655)	(3,523)	(2,180)
Interest expense, net of interest income	19,382	19,585	38,936	39,458
Income before provision for income taxes	47,078	35,313	61,608	50,793
Technical Services
Segment reporting information
Adjusted EBITDA, Total	84,297	69,390	146,474	129,435
Industrial and Field Services
Segment reporting information
Adjusted EBITDA, Total	30,716	34,760	47,088	48,572
Oil Re-refining and Recycling
Segment reporting information
Adjusted EBITDA, Total	15,196	12,752	27,779	28,098
SK Environmental Services
Segment reporting information
Adjusted EBITDA, Total	31,307	34,076	54,132	61,082
Lodging Services
Segment reporting information
Adjusted EBITDA, Total	15,487	19,259	33,224	41,560
Oil and Gas Field Services
Segment reporting information
Adjusted EBITDA, Total	1,812	4,144	18,143	31,928
Corporate Items
Segment reporting information
Adjusted EBITDA, Total	$ (43,016)	$ (50,791)	$ (89,055)	$ (105,857)

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CLOSURE AND POST-CLOSURE LIABILITIES (Tables)

6 Months Ended

Jun. 30, 2014

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”) for the six months ended June 30, 2014 were as follows (in thousands):

	Landfill Retirement Liability			Non-Landfill Retirement Liability			Total
Balance at January 1, 2014	$	27,604		$	19,481		$	47,085
New asset retirement obligations	1,914			—			1,914
Accretion	1,278			921			2,199
Changes in estimates recorded to statement of income	(142		)	238			96
Changes in estimates recorded to balance sheet	363			—			363
Expenditures	(1,322		)	(444		)	(1,766		)
Currency translation and other	1			(10		)	(9		)
Balance at June 30, 2014	$	29,696		$	20,186		$	49,882

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CLOSURE AND POST-CLOSURE LIABILITIES (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014
Changes to post-closure liabilities
Balance at January 1, 2014	$ 47,085
New asset retirement obligations	1,914
Accretion	2,199
Changes in estimates recorded to statement of income	96
Changes in estimates recorded to balance sheet	363
Expenditures	(1,766)
Currency translation and other	(9)
Balance at June 30, 2014	49,882
Credit-adjusted risk-free rate (as a percent)	6.54%
Landfill Retirement Liability
Changes to post-closure liabilities
Balance at January 1, 2014	27,604
New asset retirement obligations	1,914
Accretion	1,278
Changes in estimates recorded to statement of income	(142)
Changes in estimates recorded to balance sheet	363
Expenditures	(1,322)
Currency translation and other	1
Balance at June 30, 2014	29,696
Non-Landfill Retirement Liability
Changes to post-closure liabilities
Balance at January 1, 2014	19,481
New asset retirement obligations	0
Accretion	921
Changes in estimates recorded to statement of income	238
Changes in estimates recorded to balance sheet	0
Expenditures	(444)
Currency translation and other	(10)
Balance at June 30, 2014	$ 20,186

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INCOME TAXES

6 Months Ended

Jun. 30, 2014

Income Tax Disclosure [Abstract]

INCOME TAXES

INCOME TAXES

The Company’s effective tax rate for the three and six months ended June 30, 2014 was 39.1% and 38.9%, respectively, compared to 35.1% and 34.2% for the same period in 2013.

As of June 30, 2014 and December 31, 2013, the Company had recorded $1.3 million of liabilities for unrecognized tax benefits and $0.2 million of interest, respectively.

Due to expiring statute of limitation periods, the Company believes that total unrecognized tax benefits will decrease by approximately $0.1 million within the next twelve months.

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SEGMENT REPORTING

6 Months Ended

Jun. 30, 2014

Segment Reporting [Abstract]

SEGMENT REPORTING

SEGMENT REPORTING

During the second quarter of 2014, the Company made changes to the manner in which it manages its business, makes operating decisions and assesses performance. These changes included the reassignment of certain departments among its operating segments consistent with management reporting changes as well as the identification of Lodging Services as an additional segment. Under the new structure, the Company's operations are managed in six reportable segments based primarily upon the nature of the various operations and services provided: Technical Services, Industrial and Field Services which consists of the Industrial Services and Field Services operating segments, Oil Re-refining and Recycling, SK Environmental Services, Lodging Services and Oil and Gas Field Services. The prior year segment information has been recast to conform to the current year presentation.

The following table reconciles third party revenues to direct revenues for the three and six months ended June 30, 2014 and 2013 (in thousands):

	For the Three Months Ended June 30, 2014											For the Six Months Ended June 30, 2014
	Third party revenues		Intersegment revenues, net			Corporate Items, net			Direct revenues			Third party revenues		Intersegment revenues, net			Corporate Items, net			Direct revenues
Technical Services	$	256,798	$	40,082		$	778		$	297,658		$	493,579	$	77,516		$	1,177		$	572,272
Industrial and Field Services	185,154		(11,047		)	36			174,143			347,114		(22,805		)	191			324,500
Oil Re-refining and Recycling	144,016		(54,861		)	(5		)	89,150			272,937		(102,977		)	(5		)	169,955
SK Environmental Services	171,324		23,307			—			194,631			332,712		43,264			(58		)	375,918
Lodging Services	42,872		900			25			43,797			99,566		1,294			26			100,886
Oil and Gas Field Services	58,177		1,619			(22		)	59,774			158,949		3,708			(10		)	162,647
Corporate Items	139		—			(812		)	(673		)	290		—			(1,321		)	(1,031		)
Total	$	858,480	$	—		$	—		$	858,480		$	1,705,147	$	—		$	—		$	1,705,147

	For the Three Months Ended June 30, 2013											For the Six Months Ended June 30, 2013
	Third party revenues		Intersegment revenues, net			Corporate Items, net			Direct revenues			Third party revenues			Intersegment revenues, net			Corporate Items, net			Direct revenues
Technical Services	$	256,262	$	25,789		$	1,339		$	283,390		$	490,201		$	50,208		$	2,191		$	542,600
Industrial and Field Services	199,225		(12,680		)	(128		)	186,417			368,846			(26,440		)	(106		)	342,300
Oil Re-refining and Recycling	123,008		(48,261		)	—			74,747			263,092			(98,287		)	—			164,805
SK Environmental Services	166,523		32,207			—			198,730			326,325			67,077			84			393,486
Lodging Services	46,685		1,207			101			47,993			100,015			1,809			217			102,041
Oil and Gas Field Services	68,444		1,738			(49		)	70,133			183,607			5,633			(200		)	189,040
Corporate Items	381		—			(1,263		)	(882		)	(9,395		)	—			(2,186		)	(11,581		)
Total	$	860,528	$	—		$	—		$	860,528		$	1,722,691		$	—		$	—		$	1,722,691

Third party revenue is revenue billed to outside customers by a particular segment. Direct revenue is revenue allocated to the segment performing the provided service. Intersegment revenues represent the sharing of third party revenues among the segments based on products and services provided by each segment as if the products and services were sold directly to the third party. The intersegment revenues are shown net. The negative intersegment revenues are due to more transfers out of customer revenues to other segments than transfers in of customer revenues from other segments. The operations not managed through the Company’s six reportable segments are recorded as “Corporate Items.” Corporate Items revenues consist of two different operations for which the revenues are insignificant. Corporate Items cost of revenues represents certain central services that are not allocated to the six segments for internal reporting purposes. Corporate Items selling, general and administrative expenses include typical corporate items such as legal, accounting and other items of a general corporate nature that are not allocated to the Company’s six reportable segments. Performance of the segments is evaluated on several factors, of which the primary financial measure is “Adjusted EBITDA,” which consists of net income plus accretion of environmental liabilities, depreciation and amortization, net interest expense, provision for income taxes and pre-tax, non-cash acquisition accounting adjustments. Also excluded is other income as it is not considered part of usual business operations. Transactions between the segments are accounted for at the Company’s estimate based on similar transactions with outside customers. 

The following table presents Adjusted EBITDA information used by management for each reportable segment (in thousands). The Company does not allocate interest expense, income taxes, depreciation, amortization, accretion of environmental liabilities, pre-tax, non-cash acquisition accounting inventory adjustment, and other expense (income) to its segments.    

	For the Three Months Ended						For the Six Months Ended
	June 30,						June 30,
	2014			2013			2014			2013
Adjusted EBITDA:
Technical Services	$	84,297		$	69,390		$	146,474		$	129,435
Industrial and Field Services	30,716			34,760			47,088			48,572
Oil Re-refining and Recycling	15,196			12,752			27,779			28,098
SK Environmental Services	31,307			34,076			54,132			61,082
Lodging Services	15,487			19,259			33,224			41,560
Oil and Gas Field Services	1,812			4,144			18,143			31,928
Corporate Items	(43,016		)	(50,791		)	(89,055		)	(105,857		)
Total	$	135,799		$	123,590		$	237,785		$	234,818
Reconciliation to Consolidated Statements of Income:
Pre-tax, non-cash acquisition accounting inventory adjustment	—			—			—			13,559
Accretion of environmental liabilities	2,609			2,879			5,333			5,714
Depreciation and amortization	66,075			67,468			135,431			127,474
Income from operations	67,115			53,243			97,021			88,071
Other expense (income)	655			(1,655		)	(3,523		)	(2,180		)
Interest expense, net of interest income	19,382			19,585			38,936			39,458
Income before provision for income taxes	$	47,078		$	35,313		$	61,608		$	50,793

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

	June 30, 2014
	Technical Services		Industrial and Field Services		Oil Re-refining and Recycling		SK Environmental Services		Lodging Services		Oil and Gas Field Services		Corporate Items		Totals
Property, plant and equipment, net	$	408,977	$	260,083	$	208,630	$	245,513	$	156,730	$	229,017	$	102,348	$	1,611,298
Goodwill	50,432		109,785		174,739		172,223		35,395		36,400		—		578,974
Permits and other intangible, net	78,669		19,747		156,882		259,691		12,936		25,733		—		553,658
Total assets	$	751,444	$	416,912	$	670,797	$	742,795	$	237,671	$	390,314	$	722,510	$	3,932,443

	December 31, 2013
	Technical Services		Industrial and Field Services		Oil Re-refining and Recycling		SK Environmental Services		Lodging Services		Oil and Gas Field Services		Corporate Items		Totals
Property, plant and equipment, net	$	400,544	$	251,826	$	211,458	$	239,650	$	166,252	$	224,585	$	107,855	$	1,602,170
Goodwill	45,599		109,873		171,161		172,309		35,512		36,506		—		570,960
Permits and other intangible, net	80,302		21,147		160,807		265,106		14,730		27,881		—		569,973
Total assets	$	699,675	$	410,233	$	642,901	$	774,756	$	239,056	$	381,057	$	806,000	$	3,953,678

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

	June 30, 2014		December 31, 2013
United States	$	2,695,931	$	2,684,686
Canada	1,233,547		1,266,505
Other foreign	2,965		2,487
Total	$	3,932,443	$	3,953,678

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GOODWILL AND OTHER INTANGIBLE ASSETS (Expected Future Amortization) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2014 (six months)	$ 17,932
2015	35,607
2016	34,789
2017	32,743
2018	30,038
Thereafter	277,952
Net	$ 429,061	$ 445,335

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GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION (Tables)

6 Months Ended

Jun. 30, 2014

Guarantor and Non-Guarantor Subsidiaries Financial Information [Abstract]

Schedule of condensed consolidating balance sheet

Following is the condensed consolidating balance sheet at June 30, 2014 (in thousands):

	Clean Harbors, Inc.		U.S. Guarantor Subsidiaries		Foreign Non-Guarantor Subsidiaries		Consolidating Adjustments			Total
Assets:
Cash and cash equivalents	$	1,006	$	193,821	$	83,817	$	—		$	278,644
Intercompany receivables	237,556		2,446		84,029		(324,031		)	—
Accounts receivable, net	—		399,423		175,764					575,187
Other current assets	24,087		194,211		78,162		—			296,460
Property, plant and equipment, net	—		961,240		650,058		—			1,611,298
Investments in subsidiaries	2,762,237		760,718		—		(3,522,955		)	—
Intercompany debt receivable	—		379,428		3,701		(383,129		)	—
Goodwill			424,057		154,917					578,974
Permits and other intangibles, net			447,638		106,020					553,658
Other long-term assets	25,457		3,759		9,006		—			38,222
Total assets	$	3,050,343	$	3,766,741	$	1,345,474	$	(4,230,115	)	$	3,932,443
Liabilities and Stockholders’ Equity:
Current liabilities	$	61,029	$	429,490	$	115,747	$	—		$	606,266
Intercompany payables	—		321,533		2,498		(324,031		)	—
Closure, post-closure and remedial liabilities, net	—		150,250		31,416		—			181,666
Long-term obligations	1,395,000		—		—		—			1,395,000
Capital lease obligations, net	—		129		698		—			827
Intercompany debt payable	3,701		—		379,428		(383,129		)	—
Other long-term liabilities	91,897		103,102		54,969		—			249,968
Total liabilities	1,551,627		1,004,504		584,756		(707,160		)	2,433,727
Stockholders’ equity	1,498,716		2,762,237		760,718		(3,522,955		)	1,498,716
Total liabilities and stockholders’ equity	$	3,050,343	$	3,766,741	$	1,345,474	$	(4,230,115	)	$	3,932,443

Following is the condensed consolidating balance sheet at December 31, 2013 (in thousands):

	Clean Harbors, Inc.		U.S. Guarantor Subsidiaries		Foreign Non-Guarantor Subsidiaries		Consolidating Adjustments			Total
Assets:
Cash and cash equivalents	$	1,006	$	235,445	$	73,622	$	—		$	310,073
Intercompany receivables	269,580		2,448		230,224		(502,252		)	—
Accounts receivables	—		387,006		192,388		—			579,394
Other current assets	24,087		182,881		74,744		—			281,712
Property, plant and equipment, net	—		945,280		656,890		—			1,602,170
Investments in subsidiaries	2,683,158		967,186		144,953		(3,795,297		)	—
Intercompany debt receivable	—		493,402		3,701		(497,103		)	—
Goodwill	—		415,541		155,419		—			570,960
Permits and other intangibles, net	—		458,917		111,056		—			569,973
Other long-term assets	23,770		7,018		8,608		—			39,396
Total assets	$	3,001,601	$	4,095,124	$	1,651,605	$	(4,794,652	)	$	3,953,678
Liabilities and Stockholders’ Equity:
Current liabilities	$	33,626	$	466,454	$	139,465	$	—		$	639,545
Intercompany payables	—		499,749		2,503		(502,252		)	—
Closure, post-closure and remedial liabilities, net	—		158,298		31,814		—			190,112
Long-term obligations	1,400,000		—		—		—			1,400,000
Capital lease obligations, net	—		191		1,244		—			1,435
Intercompany debt payable	3,701		—		493,402		(497,103		)	—
Other long-term liabilities	88,635		103,125		55,187		—			246,947
Total liabilities	1,525,962		1,227,817		723,615		(999,355		)	2,478,039
Stockholders’ equity	1,475,639		2,867,307		927,990		(3,795,297		)	1,475,639
Total liabilities and stockholders’ equity	$	3,001,601	$	4,095,124	$	1,651,605	$	(4,794,652	)	$	3,953,678

Schedule of consolidating statement of income

Following is the consolidating statement of income (loss) for the three months ended June 30, 2014 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues
Service revenues				$	476,268		$	194,579		$	(5,572	)	$	665,275
Product revenues				151,667			43,136			(1,598		)	193,205
Total revenues	—			627,935			237,715			(7,170		)	858,480
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues				317,861			133,468			(5,572		)	445,757
Product cost of revenues				118,560			44,231			(1,598		)	161,193
Total cost of revenues	—			436,421			177,699			(7,170		)	606,950
Selling, general and administrative expenses	25			82,513			33,193			—			115,731
Accretion of environmental liabilities	—			2,219			390			—			2,609
Depreciation and amortization	—			41,289			24,786			—			66,075
Income from operations	(25		)	65,493			1,647			—			67,115
Other income	—			(123		)	(532		)	—			(655		)
Interest (expense) income	(19,612		)	216			14			—			(19,382		)
Equity in earnings of subsidiaries	54,436			3,393			—			(57,829		)	—
Intercompany dividend income	—						3,138			(3,138		)	—
Intercompany interest income (expense)				9,497			(9,497		)				—
Income before provision for income taxes	34,799			78,476			(5,230		)	(60,967		)	47,078
Provision (benefit) for income taxes	6,127			13,586			(1,307		)				18,406
Net income (loss)	28,672			64,890			(3,923		)	(60,967		)	28,672
Other comprehensive income (loss)	36,056			36,056			(42,927		)	6,871			36,056
Comprehensive income (loss)	$	64,728		$	100,946		$	(46,850	)	$	(54,096	)	$	64,728

Following is the consolidating statement of (loss) income for the three months ended June 30, 2013 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues
Service revenues	$	—		$	497,731		$	171,019		$	5,122		$	673,872
Product revenues	—			89,740			95,465			1,451			186,656
Total revenues	—			587,471			266,484			6,573			860,528
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	—			341,768			108,713			5,122			455,603
Product cost of revenues	—			73,712			83,560			1,451			158,723
Total cost of revenues	—			415,480			192,273			6,573			614,326
Selling, general and administrative expenses	30			89,884			32,698			—			122,612
Accretion of environmental liabilities	—			2,437			442			—			2,879
Depreciation and amortization	—			44,220			23,248			—			67,468
Income from operations	(30		)	35,450			17,823			—			53,243
Other income (expense)	—			2,249			(594		)	—			1,655
Interest (expense) income	(19,764		)	—			179			—			(19,585		)
Equity in earnings of subsidiaries	45,106			14,563			—			(59,669		)	—
Intercompany dividend income	—			—			3,323			(3,323		)	—
Intercompany interest income (expense)	—			9,969			(9,969		)	—			—
Income before provision for income taxes	25,312			62,231			10,762			(62,992		)	35,313
Provision for income taxes	2,410			7,009			2,992			—			12,411
Net income	22,902			55,222			7,770			(62,992		)	22,902
Other comprehensive (loss) income	(35,506		)	(35,506		)	18,685			16,821			(35,506		)
Comprehensive (loss) income	$	(12,604	)	$	19,716		$	26,455		$	(46,171	)	$	(12,604	)

Following is the consolidating statement of income (loss) for the six months ended June 30, 2014 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues
Service revenues				$	920,142		$	413,584		$	(8,356	)	$	1,325,370
Product revenues				286,542			95,629			(2,394		)	379,777
Total revenues	—			1,206,684			509,213			(10,750		)	1,705,147
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues				622,502			298,410			(8,356		)	912,556
Product cost of revenues				233,488			89,019			(2,394		)	320,113
Total cost of revenues	—			855,990			387,429			(10,750		)	1,232,669
Selling, general and administrative expenses	56			170,066			64,571			—			234,693
Accretion of environmental liabilities				4,567			766						5,333
Depreciation and amortization				84,021			51,410			—			135,431
Income from operations	(56		)	92,040			5,037			—			97,021
Other income				786			2,737						3,523
Interest (expense) income	(39,346		)	446			(36		)				(38,936		)
Equity in earnings of subsidiaries	84,545			11,855						(96,400		)	—
Intercompany dividend income	—						6,238			(6,238		)	—
Intercompany interest income (expense)				18,881			(18,881		)				—
Income before provision for income taxes	45,143			124,008			(4,905		)	(102,638		)	61,608
Provision (benefit) for income taxes	7,511			17,691			(1,226		)				23,976
Net income (loss)	37,632			106,317			(3,679		)	(102,638		)	37,632
Other comprehensive loss	(5,469		)	(5,469		)	(23,245		)	28,714			(5,469		)
Comprehensive income (loss)	$	32,163		$	100,848		$	(26,924	)	$	(73,924	)	$	32,163

Following is the consolidating statement of (loss) income for the six months ended June 30, 2013 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues
Service revenues	$	—		$	896,966		$	452,438		$	(2,910	)	$	1,346,494
Product revenues	—			250,603			126,407			(813		)	376,197
Total revenues	—			1,147,569			578,845			(3,723		)	1,722,691
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	—			615,940			310,945			(2,910		)	923,975
Product cost of revenues	—			217,353			109,835			(813		)	326,375
Total cost of revenues	—			833,293			420,780			(3,723		)	1,250,350
Selling, general and administrative expenses	55			185,445			65,582			—			251,082
Accretion of environmental liabilities	—			4,837			877			—			5,714
Depreciation and amortization	—			81,509			45,965			—			127,474
Income from operations	(55		)	42,485			45,641			—			88,071
Other income (expense)	—			2,969			(789		)	—			2,180
Interest (expense) income	(39,564		)	—			106			—			(39,458		)
Equity in earnings of subsidiaries	75,327			35,976			—			(111,303		)	—
Intercompany dividend income	—			—			6,968			(6,968		)	—
Intercompany interest income (expense)	—			20,307			(20,307		)	—			—
Income before provision for income taxes	35,708			101,737			31,619			(118,271		)	50,793
Provision for income taxes	2,304			6,535			8,550			—			17,389
Net income	33,404			95,202			23,069			(118,271		)	33,404
Other comprehensive (loss) income	(59,367		)	(59,367		)	30,457			28,910			(59,367		)
Comprehensive (loss) income	$	(25,963	)	$	35,835		$	53,526		$	(89,361	)	$	(25,963	)

Schedule of condensed consolidating statement of cash flows

Following is the condensed consolidating statement of cash flows for the six months ended June 30, 2014 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Total
Net cash from operating activities	$	16,864		$	35,046		$	63,034		$	114,944
Cash flows from investing activities:
Additions to property, plant and equipment	—			(90,515		)	(47,671		)	(138,186		)
Proceeds from sales of fixed assets	—			1,015			1,971			2,986
Acquisitions, net of cash acquired	—			(6,150		)	—			(6,150		)
Costs to obtain or renew permits	—			(477		)	(2,414		)	(2,891		)
Proceeds from sales of marketable securities	—			—			12,947			12,947
Net cash used in investing activities	—			(96,127		)	(35,167		)	(131,294		)
Cash flows from financing activities:
Change in uncashed checks	—			4,595			(1,433		)	3,162
Proceeds from employee stock purchase plan	4,364			—			—			4,364
Remittance of shares, net	(2,215		)	—			—			(2,215		)
Repurchases of common stock	(14,657		)	—			—			(14,657		)
Excess tax benefit of stock-based compensation	644			—			—			644
Payments on capital leases	—			(87		)	(1,103		)	(1,190		)
Repayment of long-term obligations	(5,000		)	—			—			(5,000		)
Dividends (paid) / received	—			(7,412		)	7,412			—
Interest received / (payments)	—			22,361			(22,361		)	—
Net cash from financing activities	(16,864		)	19,457			(17,485		)	(14,892		)
Effect of exchange rate change on cash	—			—			(187		)	(187		)
(Decrease) increase in cash and cash equivalents	—			(41,624		)	10,195			(31,429		)
Cash and cash equivalents, beginning of period	1,006			235,445			73,622			310,073
Cash and cash equivalents, end of period	$	1,006		$	193,821		$	83,817		$	278,644

Following is the condensed consolidating statement of cash flows for the six months ended June 30, 2013 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Total
Net cash from operating activities	$	(36,459	)	$	84,226		$	89,845		$	137,612
Cash flows from investing activities:
Additions to property, plant and equipment	—			(62,818		)	(78,648		)	(141,466		)
Proceeds from sale of fixed assets	—			803			1,391			2,194
Acquisitions, net of cash acquired	—			—			—			—
Costs to obtain or renew permits	—			(212		)	(1,957		)	(2,169		)
Net cash used in investing activities	—			(62,227		)	(79,214		)	(141,441		)
Cash flows from financing activities:
Change in uncashed checks	—			37,118			3,238			40,356
Proceeds from exercise of stock options	399			—			—			399
Proceeds from employee stock purchase plan	3,391			—			—			3,391
Remittance of shares, net	(169		)	—			—			(169		)
Excess tax benefit of stock-based compensation	1,326			—			—			1,326
Deferred financing costs paid	(2,446		)	—			—			(2,446		)
Payments of capital leases	—			(164		)	(2,424		)	(2,588		)
Issuance costs related to 2012 issuance of common stock	(250		)	—			—			(250		)
Dividends (paid) / received	—			(6,989		)	6,989			—
Interest received / (payments)	—			21,780			(21,780		)	—
Net cash from financing activities	2,251			51,745			(13,977		)	40,019
Effect of exchange rate change on cash	—			—			(2,548		)	(2,548		)
(Decrease) increase in cash and cash equivalents	(34,208		)	73,744			(5,894		)	33,642
Cash and cash equivalents, beginning of period	35,214			140,683			53,939			229,836
Cash and cash equivalents, end of period	$	1,006		$	214,427		$	48,045		$	263,478

XML

UNAUDITED CONSOLIDATED STATEMENTS OF INCOME (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Income Statement [Abstract]
Interest income	$ 211	$ 155	$ 416	$ 266

XML

BASIS OF PRESENTATION

6 Months Ended

Jun. 30, 2014

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, 2013.

Reclassifications

During the second quarter of 2014, the Company made changes to the manner in which it manages its business, makes operating decisions and assesses performance. These changes included the reassignment of certain departments among its operating segments consistent with management reporting changes as well as the identification of Lodging Services as an additional segment. Under the new structure, the Company's operations are managed in six reportable segments: Technical Services, Industrial and Field Services, Oil Re-refining and Recycling, SK Environmental Services, Lodging Services and Oil and Gas Field Services. The prior year segment information has been recast to conform to the current year presentation. See Note 17, “Segment Reporting.”

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ACCUMULATED OTHER COMPREHENSIVE LOSS (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other (expense) income		$ 3,361
Unrealized gains on available-for-sale investments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other (expense) income	$ 53	$ 3,361

XML

GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION

6 Months Ended

Jun. 30, 2014

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 2021 Notes are guaranteed by substantially all of the Company's subsidiaries organized in the United States. Each guarantor for the 2020 Notes and 2021 Notes is a 100% owned subsidiary of the Company and its guarantee is both full and unconditional and joint and several.  The 2020 Notes and 2021 Notes are not guaranteed by the Company’s Canadian or other foreign subsidiaries. The following presents supplemental condensed consolidating financial information for the parent company, the guarantor subsidiaries and the non-guarantor subsidiaries, respectively.

Following is the condensed consolidating balance sheet at June 30, 2014 (in thousands):

	Clean Harbors, Inc.		U.S. Guarantor Subsidiaries		Foreign Non-Guarantor Subsidiaries		Consolidating Adjustments			Total
Assets:
Cash and cash equivalents	$	1,006	$	193,821	$	83,817	$	—		$	278,644
Intercompany receivables	237,556		2,446		84,029		(324,031		)	—
Accounts receivable, net	—		399,423		175,764					575,187
Other current assets	24,087		194,211		78,162		—			296,460
Property, plant and equipment, net	—		961,240		650,058		—			1,611,298
Investments in subsidiaries	2,762,237		760,718		—		(3,522,955		)	—
Intercompany debt receivable	—		379,428		3,701		(383,129		)	—
Goodwill			424,057		154,917					578,974
Permits and other intangibles, net			447,638		106,020					553,658
Other long-term assets	25,457		3,759		9,006		—			38,222
Total assets	$	3,050,343	$	3,766,741	$	1,345,474	$	(4,230,115	)	$	3,932,443
Liabilities and Stockholders’ Equity:
Current liabilities	$	61,029	$	429,490	$	115,747	$	—		$	606,266
Intercompany payables	—		321,533		2,498		(324,031		)	—
Closure, post-closure and remedial liabilities, net	—		150,250		31,416		—			181,666
Long-term obligations	1,395,000		—		—		—			1,395,000
Capital lease obligations, net	—		129		698		—			827
Intercompany debt payable	3,701		—		379,428		(383,129		)	—
Other long-term liabilities	91,897		103,102		54,969		—			249,968
Total liabilities	1,551,627		1,004,504		584,756		(707,160		)	2,433,727
Stockholders’ equity	1,498,716		2,762,237		760,718		(3,522,955		)	1,498,716
Total liabilities and stockholders’ equity	$	3,050,343	$	3,766,741	$	1,345,474	$	(4,230,115	)	$	3,932,443

Following is the condensed consolidating balance sheet at December 31, 2013 (in thousands):

	Clean Harbors, Inc.		U.S. Guarantor Subsidiaries		Foreign Non-Guarantor Subsidiaries		Consolidating Adjustments			Total
Assets:
Cash and cash equivalents	$	1,006	$	235,445	$	73,622	$	—		$	310,073
Intercompany receivables	269,580		2,448		230,224		(502,252		)	—
Accounts receivables	—		387,006		192,388		—			579,394
Other current assets	24,087		182,881		74,744		—			281,712
Property, plant and equipment, net	—		945,280		656,890		—			1,602,170
Investments in subsidiaries	2,683,158		967,186		144,953		(3,795,297		)	—
Intercompany debt receivable	—		493,402		3,701		(497,103		)	—
Goodwill	—		415,541		155,419		—			570,960
Permits and other intangibles, net	—		458,917		111,056		—			569,973
Other long-term assets	23,770		7,018		8,608		—			39,396
Total assets	$	3,001,601	$	4,095,124	$	1,651,605	$	(4,794,652	)	$	3,953,678
Liabilities and Stockholders’ Equity:
Current liabilities	$	33,626	$	466,454	$	139,465	$	—		$	639,545
Intercompany payables	—		499,749		2,503		(502,252		)	—
Closure, post-closure and remedial liabilities, net	—		158,298		31,814		—			190,112
Long-term obligations	1,400,000		—		—		—			1,400,000
Capital lease obligations, net	—		191		1,244		—			1,435
Intercompany debt payable	3,701		—		493,402		(497,103		)	—
Other long-term liabilities	88,635		103,125		55,187		—			246,947
Total liabilities	1,525,962		1,227,817		723,615		(999,355		)	2,478,039
Stockholders’ equity	1,475,639		2,867,307		927,990		(3,795,297		)	1,475,639
Total liabilities and stockholders’ equity	$	3,001,601	$	4,095,124	$	1,651,605	$	(4,794,652	)	$	3,953,678

Following is the consolidating statement of income (loss) for the three months ended June 30, 2014 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues
Service revenues				$	476,268		$	194,579		$	(5,572	)	$	665,275
Product revenues				151,667			43,136			(1,598		)	193,205
Total revenues	—			627,935			237,715			(7,170		)	858,480
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues				317,861			133,468			(5,572		)	445,757
Product cost of revenues				118,560			44,231			(1,598		)	161,193
Total cost of revenues	—			436,421			177,699			(7,170		)	606,950
Selling, general and administrative expenses	25			82,513			33,193			—			115,731
Accretion of environmental liabilities	—			2,219			390			—			2,609
Depreciation and amortization	—			41,289			24,786			—			66,075
Income from operations	(25		)	65,493			1,647			—			67,115
Other income	—			(123		)	(532		)	—			(655		)
Interest (expense) income	(19,612		)	216			14			—			(19,382		)
Equity in earnings of subsidiaries	54,436			3,393			—			(57,829		)	—
Intercompany dividend income	—						3,138			(3,138		)	—
Intercompany interest income (expense)				9,497			(9,497		)				—
Income before provision for income taxes	34,799			78,476			(5,230		)	(60,967		)	47,078
Provision (benefit) for income taxes	6,127			13,586			(1,307		)				18,406
Net income (loss)	28,672			64,890			(3,923		)	(60,967		)	28,672
Other comprehensive income (loss)	36,056			36,056			(42,927		)	6,871			36,056
Comprehensive income (loss)	$	64,728		$	100,946		$	(46,850	)	$	(54,096	)	$	64,728

Following is the consolidating statement of (loss) income for the three months ended June 30, 2013 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues
Service revenues	$	—		$	497,731		$	171,019		$	5,122		$	673,872
Product revenues	—			89,740			95,465			1,451			186,656
Total revenues	—			587,471			266,484			6,573			860,528
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	—			341,768			108,713			5,122			455,603
Product cost of revenues	—			73,712			83,560			1,451			158,723
Total cost of revenues	—			415,480			192,273			6,573			614,326
Selling, general and administrative expenses	30			89,884			32,698			—			122,612
Accretion of environmental liabilities	—			2,437			442			—			2,879
Depreciation and amortization	—			44,220			23,248			—			67,468
Income from operations	(30		)	35,450			17,823			—			53,243
Other income (expense)	—			2,249			(594		)	—			1,655
Interest (expense) income	(19,764		)	—			179			—			(19,585		)
Equity in earnings of subsidiaries	45,106			14,563			—			(59,669		)	—
Intercompany dividend income	—			—			3,323			(3,323		)	—
Intercompany interest income (expense)	—			9,969			(9,969		)	—			—
Income before provision for income taxes	25,312			62,231			10,762			(62,992		)	35,313
Provision for income taxes	2,410			7,009			2,992			—			12,411
Net income	22,902			55,222			7,770			(62,992		)	22,902
Other comprehensive (loss) income	(35,506		)	(35,506		)	18,685			16,821			(35,506		)
Comprehensive (loss) income	$	(12,604	)	$	19,716		$	26,455		$	(46,171	)	$	(12,604	)

Following is the consolidating statement of income (loss) for the six months ended June 30, 2014 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues
Service revenues				$	920,142		$	413,584		$	(8,356	)	$	1,325,370
Product revenues				286,542			95,629			(2,394		)	379,777
Total revenues	—			1,206,684			509,213			(10,750		)	1,705,147
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues				622,502			298,410			(8,356		)	912,556
Product cost of revenues				233,488			89,019			(2,394		)	320,113
Total cost of revenues	—			855,990			387,429			(10,750		)	1,232,669
Selling, general and administrative expenses	56			170,066			64,571			—			234,693
Accretion of environmental liabilities				4,567			766						5,333
Depreciation and amortization				84,021			51,410			—			135,431
Income from operations	(56		)	92,040			5,037			—			97,021
Other income				786			2,737						3,523
Interest (expense) income	(39,346		)	446			(36		)				(38,936		)
Equity in earnings of subsidiaries	84,545			11,855						(96,400		)	—
Intercompany dividend income	—						6,238			(6,238		)	—
Intercompany interest income (expense)				18,881			(18,881		)				—
Income before provision for income taxes	45,143			124,008			(4,905		)	(102,638		)	61,608
Provision (benefit) for income taxes	7,511			17,691			(1,226		)				23,976
Net income (loss)	37,632			106,317			(3,679		)	(102,638		)	37,632
Other comprehensive loss	(5,469		)	(5,469		)	(23,245		)	28,714			(5,469		)
Comprehensive income (loss)	$	32,163		$	100,848		$	(26,924	)	$	(73,924	)	$	32,163

Following is the consolidating statement of (loss) income for the six months ended June 30, 2013 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues
Service revenues	$	—		$	896,966		$	452,438		$	(2,910	)	$	1,346,494
Product revenues	—			250,603			126,407			(813		)	376,197
Total revenues	—			1,147,569			578,845			(3,723		)	1,722,691
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	—			615,940			310,945			(2,910		)	923,975
Product cost of revenues	—			217,353			109,835			(813		)	326,375
Total cost of revenues	—			833,293			420,780			(3,723		)	1,250,350
Selling, general and administrative expenses	55			185,445			65,582			—			251,082
Accretion of environmental liabilities	—			4,837			877			—			5,714
Depreciation and amortization	—			81,509			45,965			—			127,474
Income from operations	(55		)	42,485			45,641			—			88,071
Other income (expense)	—			2,969			(789		)	—			2,180
Interest (expense) income	(39,564		)	—			106			—			(39,458		)
Equity in earnings of subsidiaries	75,327			35,976			—			(111,303		)	—
Intercompany dividend income	—			—			6,968			(6,968		)	—
Intercompany interest income (expense)	—			20,307			(20,307		)	—			—
Income before provision for income taxes	35,708			101,737			31,619			(118,271		)	50,793
Provision for income taxes	2,304			6,535			8,550			—			17,389
Net income	33,404			95,202			23,069			(118,271		)	33,404
Other comprehensive (loss) income	(59,367		)	(59,367		)	30,457			28,910			(59,367		)
Comprehensive (loss) income	$	(25,963	)	$	35,835		$	53,526		$	(89,361	)	$	(25,963	)

Following is the condensed consolidating statement of cash flows for the six months ended June 30, 2014 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Total
Net cash from operating activities	$	16,864		$	35,046		$	63,034		$	114,944
Cash flows from investing activities:
Additions to property, plant and equipment	—			(90,515		)	(47,671		)	(138,186		)
Proceeds from sales of fixed assets	—			1,015			1,971			2,986
Acquisitions, net of cash acquired	—			(6,150		)	—			(6,150		)
Costs to obtain or renew permits	—			(477		)	(2,414		)	(2,891		)
Proceeds from sales of marketable securities	—			—			12,947			12,947
Net cash used in investing activities	—			(96,127		)	(35,167		)	(131,294		)
Cash flows from financing activities:
Change in uncashed checks	—			4,595			(1,433		)	3,162
Proceeds from employee stock purchase plan	4,364			—			—			4,364
Remittance of shares, net	(2,215		)	—			—			(2,215		)
Repurchases of common stock	(14,657		)	—			—			(14,657		)
Excess tax benefit of stock-based compensation	644			—			—			644
Payments on capital leases	—			(87		)	(1,103		)	(1,190		)
Repayment of long-term obligations	(5,000		)	—			—			(5,000		)
Dividends (paid) / received	—			(7,412		)	7,412			—
Interest received / (payments)	—			22,361			(22,361		)	—
Net cash from financing activities	(16,864		)	19,457			(17,485		)	(14,892		)
Effect of exchange rate change on cash	—			—			(187		)	(187		)
(Decrease) increase in cash and cash equivalents	—			(41,624		)	10,195			(31,429		)
Cash and cash equivalents, beginning of period	1,006			235,445			73,622			310,073
Cash and cash equivalents, end of period	$	1,006		$	193,821		$	83,817		$	278,644

Following is the condensed consolidating statement of cash flows for the six months ended June 30, 2013 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Total
Net cash from operating activities	$	(36,459	)	$	84,226		$	89,845		$	137,612
Cash flows from investing activities:
Additions to property, plant and equipment	—			(62,818		)	(78,648		)	(141,466		)
Proceeds from sale of fixed assets	—			803			1,391			2,194
Acquisitions, net of cash acquired	—			—			—			—
Costs to obtain or renew permits	—			(212		)	(1,957		)	(2,169		)
Net cash used in investing activities	—			(62,227		)	(79,214		)	(141,441		)
Cash flows from financing activities:
Change in uncashed checks	—			37,118			3,238			40,356
Proceeds from exercise of stock options	399			—			—			399
Proceeds from employee stock purchase plan	3,391			—			—			3,391
Remittance of shares, net	(169		)	—			—			(169		)
Excess tax benefit of stock-based compensation	1,326			—			—			1,326
Deferred financing costs paid	(2,446		)	—			—			(2,446		)
Payments of capital leases	—			(164		)	(2,424		)	(2,588		)
Issuance costs related to 2012 issuance of common stock	(250		)	—			—			(250		)
Dividends (paid) / received	—			(6,989		)	6,989			—
Interest received / (payments)	—			21,780			(21,780		)	—
Net cash from financing activities	2,251			51,745			(13,977		)	40,019
Effect of exchange rate change on cash	—			—			(2,548		)	(2,548		)
(Decrease) increase in cash and cash equivalents	(34,208		)	73,744			(5,894		)	33,642
Cash and cash equivalents, beginning of period	35,214			140,683			53,939			229,836
Cash and cash equivalents, end of period	$	1,006		$	214,427		$	48,045		$	263,478

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ACCUMULATED OTHER COMPREHENSIVE LOSS (Tables)

6 Months Ended

Jun. 30, 2014

Equity [Abstract]

Schedule of accumulated other comprehensive loss

The changes in accumulated other comprehensive loss by component and related tax effects for the six months ended June 30, 2014 were as follows (in thousands):    

	Foreign Currency Translation			Unrealized (Losses) Gains on Available-For-Sale Securities			Unfunded Pension Liability			Total
Balance at January 1, 2014	$	(20,164	)	$	1,904		$	(1,296	)	$	(19,556	)
Other comprehensive (loss) gain before reclassifications	(3,411		)	940			—			(2,471		)
Amounts reclassified out of accumulated other comprehensive loss	—			(3,361		)	—			(3,361		)
Tax effects	—			363			—			363
Other comprehensive loss	$	(3,411	)	$	(2,058	)	$	—		$	(5,469	)
Balance at June 30, 2014	$	(23,575	)	$	(154	)	$	(1,296	)	$	(25,025	)

Summary of amounts reclassified out of accumulated other comprehensive loss

The amounts reclassified out of accumulated other comprehensive loss into the consolidated statement of income, with presentation location during the six months ended June 30, 2014 were as follows (in thousands):

	For the Three Months Ended		For the Six Months Ended
Comprehensive Loss Components	June 30, 2014		June 30, 2014		Location
Unrealized gains on available-for-sale investments	$	53	$	3,361	Other (expense) income

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FINANCING ARRANGEMENTS

6 Months Ended

Jun. 30, 2014

Debt Disclosure [Abstract]

FINANCING ARRANGEMENTS

FINANCING ARRANGEMENTS

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

	June 30, 2014		December 31, 2013
Senior unsecured notes, at 5.25%, due August 1, 2020	$	800,000	$	800,000
Senior unsecured notes, at 5.125%, due June 1, 2021	595,000		600,000
Long-term obligations	$	1,395,000	$	1,400,000

On July 30, 2012, the Company issued through a private placement $800.0 million aggregate principal amount of 5.25% senior unsecured notes due August 1, 2020 ("2020 Notes") with semi-annually fixed interest payments on February 1 and August 1 of each year, which commenced on February 1, 2013. At June 30, 2014 and December 31, 2013, the fair value of the Company's 2020 Notes was $806.5 million and $804.2 million, respectively, based on quoted market prices for the instrument and accrued interest. The fair value of the 2020 Notes is considered a Level 2 measure according to the fair value hierarchy.

On December 7, 2012, the Company issued through a private placement $600.0 million aggregate principal amount of 5.125% senior unsecured notes due 2021 ("2021 Notes") with semi-annually fixed interest payments on June 1 and December 1 of each year, which commenced on June 1, 2013. At June 30, 2014 and December 31, 2013, the fair value of the Company's 2021 Notes was $607.3 million and $601.6 million, respectively, based on quoted market prices for the instrument and accrued interest. The fair value of the 2021 Notes is considered a Level 2 measure according to the fair value hierarchy.

The Company also maintains a revolving credit facility which as of June 30, 2014 and December 31, 2013 had no outstanding loan balances. At June 30, 2014, $287.8 million was available to borrow and outstanding letters of credit were $112.2 million. At December 31, 2013, $259.7 million was available to borrow and outstanding letters of credit were $140.3 million.