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 SEPTEMBER 30, 2013
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	60,659,766
(Class)	(Outstanding as of Nov 1, 2013)

CLEAN HARBORS, INC.

QUARTERLY REPORT ON FORM 10-Q

TABLE OF CONTENTS

	Page No.
PART I: FINANCIAL INFORMATION
ITEM 1: Unaudited Financial Statements
Consolidated Balance Sheets	1
Unaudited Consolidated Statements of Income	2
Unaudited Consolidated Statements of Comprehensive Income	3
Unaudited Consolidated Statements of Cash Flows	4
Unaudited Consolidated Statements of Stockholders’ Equity	5
Notes to Unaudited Consolidated Financial Statements	6
ITEM 2: Management’s Discussion and Analysis of Financial Condition and Results of Operations	32
ITEM 3: Quantitative and Qualitative Disclosures About Market Risk	44
ITEM 4: Controls and Procedures	45
PART II: OTHER INFORMATION
ITEM 1: Legal Proceedings	46
ITEM 1A: Risk Factors	46
ITEM 6: Exhibits	46
Signatures	47

CLEAN HARBORS, INC. AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS

ASSETS

(in thousands)

	September 30, 2013			December 31, 2012
ASSETS	(unaudited)
Current assets:
Cash and cash equivalents	$	248,635		$	229,836
Marketable securities	11,787			11,778
Accounts receivable, net of allowances aggregating $17,824 and $11,125, respectively	603,054			541,423
Unbilled accounts receivable	42,122			27,072
Deferred costs	17,097			6,888
Prepaid expenses and other current assets	41,880			75,778
Inventories and supplies	155,301			171,441
Deferred tax assets	21,898			22,577
Total current assets	1,141,774			1,086,793
Property, plant and equipment, net	1,615,427			1,531,763
Other assets:
Long-term investments	4,352			4,354
Deferred financing costs	21,565			21,657
Goodwill	590,152			593,771
Permits and other intangibles, net	567,776			572,817
Other	15,806			14,651
Total other assets	1,199,651			1,207,250
Total assets	$	3,956,852		$	3,825,806
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
Current portion of capital lease obligations	$	1,973		$	5,092
Accounts payable	321,097			256,468
Deferred revenue	61,912			50,942
Accrued expenses	256,813			232,429
Current portion of closure, post-closure and remedial liabilities	27,737			24,121
Total current liabilities	669,532			569,052
Other liabilities:
Closure and post-closure liabilities, less current portion of $7,512 and $8,791, respectively	39,982			45,457
Remedial liabilities, less current portion of $20,225 and $15,330, respectively	151,866			151,890
Long-term obligations	1,400,000			1,400,000
Capital lease obligations, less current portion	1,669			2,879
Deferred taxes, unrecognized tax benefits and other long-term liabilities	217,683			224,456
Total other liabilities	1,811,200			1,824,682
Stockholders’ equity:
Common stock, $.01 par value:
Authorized 80,000,000; shares issued and outstanding 60,612,702 and 60,385,453  shares, respectively	606			604
Shares held under employee participation plan	(469		)	(469		)
Additional paid-in capital	893,822			880,979
Accumulated other comprehensive income	12,070			49,632
Accumulated earnings	570,091			501,326
Total stockholders’ equity	1,476,120			1,432,072
Total liabilities and stockholders’ equity	$	3,956,852		$	3,825,806

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						Nine Months Ended
	September 30,						September 30,
	2013			2012			2013			2012
Revenues:
Service revenues	$	702,033		$	503,728		$	2,048,527		$	1,523,767
Product revenues	205,502			30,078			581,699			105,179
Total revenues	907,535			533,806			2,630,226			1,628,946
Cost of revenues (exclusive of items shown separately below)
Service revenues	478,434			348,758			1,402,409			1,056,174
Product revenues	168,685			24,182			495,060			84,704
Total cost of revenues	647,119			372,940			1,897,469			1,140,878
Selling, general and administrative expenses	114,464			60,339			365,546			197,892
Accretion of environmental liabilities	2,914			2,488			8,628			7,409
Depreciation and amortization	69,430			41,300			196,904			116,794
Income from operations	73,608			56,739			161,679			165,973
Other (expense) income	(150		)	(91		)	2,030			(465		)
Loss on early extinguishment of debt	—			(26,385		)	—			(26,385		)
Interest expense, net of interest income of $96 and $362 for the quarter and year-to-date ended 2013 and $221 and $623 for the quarter and year-to-date ended 2012, respectively	(19,326		)	(11,596		)	(58,784		)	(33,836		)
Income before provision for income taxes	54,132			18,667			104,925			105,287
Provision for income taxes	18,771			6,308			36,160			37,487
Net income	$	35,361		$	12,359		$	68,765		$	67,800
Earnings per share:
Basic	$	0.58		$	0.23		$	1.14		$	1.27
Diluted	$	0.58		$	0.23		$	1.13		$	1.27
Weighted average common shares outstanding - basic	60,610			53,374			60,542			53,303
Weighted average common shares outstanding - diluted	60,760			53,565			60,692			53,519

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

2

CLEAN HARBORS, INC. AND SUBSIDIARIES

UNAUDITED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(in thousands)

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2013		2012		2013			2012
Net income	$	35,361	$	12,359	$	68,765		$	67,800
Other comprehensive income (loss):
Unrealized gains on available-for-sale securities (net of taxes of $153 and $61 for the quarter and year-to-date 2013 and $146 and $63 for the quarter and year-to date 2012,respectively)	1,074		894		359			310
Foreign currency translation adjustments	20,731		29,086		(37,921		)	27,393
Other comprehensive income (loss)	21,805		29,980		(37,562		)	27,703
Comprehensive income	$	57,166	$	42,339	$	31,203		$	95,503

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)

	Nine Months Ended
	September 30,
	2013			2012
Cash flows from operating activities:
Net income	$	68,765		$	67,800
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	196,904			116,794
Pre-tax, non-cash acquisition accounting adjustments	13,559			—
Allowance for doubtful accounts	5,281			809
Amortization of deferred financing costs and debt discount	2,539			1,173
Accretion of environmental liabilities	8,628			7,409
Changes in environmental liability estimates	(2,417		)	(3,553		)
Deferred income taxes	272			(494		)
Stock-based compensation	6,389			5,235
Excess tax benefit of stock-based compensation	(1,589		)	(1,786		)
Income tax benefit related to stock option exercises	1,579			1,776
Other expense (income)	(2,030		)	465
Write-off of deferred financing costs and debt premium	—			5,341
Environmental expenditures	(15,928		)	(7,833		)
Changes in assets and liabilities, net of acquisitions
Accounts receivable	(72,377		)	59,881
Inventories and supplies	1,710			(7,692		)
Other current assets	11,860			12,822
Accounts payable	37,257			(18,969		)
Other current and long-term liabilities	19,712			(6,486		)
Net cash from operating activities	280,114			232,692
Cash flows from investing activities:
Additions to property, plant and equipment	(207,641		)	(130,326		)
Proceeds from sales of fixed assets	3,700			4,190
Acquisitions, net of cash acquired	(59,458		)	(92,475		)
Additions to intangible assets, including costs to obtain or renew permits	(4,357		)	(2,409		)
Purchase of marketable securities	—			(10,517		)
Other	(11		)	5,120
Net cash used in investing activities	(267,767		)	(226,417		)
Cash flows from financing activities:
Change in uncashed checks	9,754			(13,955		)
Proceeds from exercise of stock options	399			231
Remittance of shares, net	(599		)	(1,604		)
Proceeds from employee stock purchase plan	5,327			4,627
Deferred financing costs paid	(2,446		)	(9,638		)
Payments on capital leases	(4,096		)	(5,303		)
Principal payment on debt	—			(520,000		)
Issuance of senior unsecured notes, including premium	—			800,000
Issuance costs related to 2012 issuance of common stock	(250		)	—
Distribution of cash earned on employee participation plan	—			(55		)
Excess tax benefit of stock-based compensation	1,589			1,786
Net cash from financing activities	9,678			256,089
Effect of exchange rate change on cash	(3,226		)	527
Increase in cash and cash equivalents	18,799			262,891
Cash and cash equivalents, beginning of period	229,836			260,723
Cash and cash equivalents, end of period	$	248,635		$	523,614
Supplemental information:
Cash payments for interest and income taxes:
Interest paid	$	58,084		$	41,176
Income taxes paid	8,386			5,578
Non-cash investing and financing activities:
Property, plant and equipment accrued	39,804			31,978
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 Income
	Number of Shares		$ 0.01 Par Value					Additional Paid-in Capital						Accumulated Earnings		Total Stockholders’ Equity
Balance at January 1, 2013	60,385		$	604	$	(469	)	$	880,979		$	49,632		$	501,326	$	1,432,072
Net income	—		—		—			—			—			68,765		68,765
Other comprehensive loss	—		—		—			—			(37,562		)	—		(37,562		)
Stock-based compensation	57		—		—			6,389			—			—		6,389
Issuance of restricted shares, net of shares remitted	(14	)	—		—			(599		)	—			—		(599		)
Issuance costs related to 2012 issuance of common stock	—		—		—			(250		)	—			—		(250		)
Exercise of stock options	61		2		—			397			—			—		399
Net tax benefit on exercise of stock-based awards	—		—		—			1,579			—			—		1,579
Employee stock purchase plan	123		—		—			5,327			—			—		5,327
Balance at September 30, 2013	60,612		$	606	$	(469	)	$	893,822		$	12,070		$	570,091	$	1,476,120

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. 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, 2012.

During the first quarter of 2013, the Company adjusted its operating segments to integrate the business activities of Safety-Kleen, Inc. and its subsidiaries (collectively, “Safety-Kleen”) acquired in December 2012, and to incorporate other changes made in 2013 to the manner in which the Company manages its business, makes operating decisions and assesses its performance. Under the new structure, the Company's operations are managed in five reportable segments: Technical Services, Oil Re-refining and Recycling, SK Environmental Services, Industrial and Field 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, 2012. On December 28, 2012, the Company acquired 100% of the outstanding common shares of Safety-Kleen. There have been no changes in these policies or their application, other than as described below related to certain policies applicable to Safety-Kleen. See Note 3, “Business Combinations.” No revenue, expense, income or loss of Safety-Kleen was included in the Company's consolidated statements of income for the year ended December 31, 2012 due to the immateriality of Safety-Kleen's operating results subsequent to December 28, 2012.

Safety-Kleen's operating results are included in the Company's unaudited consolidated statements of income for the three and nine months ended September 30, 2013, and reflect the application of certain significant accounting policies as described below:

Revenue Recognition and Deferred Revenue

S-K Environmental Services revenue is generated from providing parts cleaning services, containerized waste services, oil collection services and other complementary products and services.

Parts cleaning services generally consist of placing a specially designed parts washer at a customer's premises and then, on a recurring basis, delivering clean solvent or aqueous-based washing fluid, cleaning and servicing the parts washer and removing the used solvent or aqueous fluid. The Company also services customer-owned parts washers. Revenue from parts cleaning services is recognized over the service interval. Service intervals represent the actual amount of time between service visits to a particular parts cleaning customer. Average service intervals vary from seven to 14 weeks depending on several factors, such as customer accommodation, types of machines serviced and frequency of use.

Containerized waste services consist of profiling, collecting, transporting and recycling or disposing of a wide variety of hazardous and non-hazardous wastes. Revenue is recognized upon disposal. The Company tracks the amount of time it takes from collection of the customer's waste to delivery to the disposal outlet, which represents a deferral period of approximately two and one-half weeks.

Other complementary products and services include vacuum services, allied products and other environmental services. Revenue is recognized when products are delivered and services are performed.

Oil Re-refining and Recycling revenue is generated from re-refining used oil to produce high quality base and blended lubricating oils, and recycling used oil collected in excess of the Company's re-refining capacity into recycled fuel oil. The high quality base and blended lubricating oils are sold to third-party distributors, retailers, government agencies, fleets, railroads and industrial customers. The recycled fuel oil is sold to asphalt plants, industrial plants, blenders, pulp and paper companies, vacuum gas oil producers and marine diesel oil producers. Revenue is recognized upon delivery.

6

Deferred Costs Relating to Deferred Revenue

Commissions and other incremental direct costs, primarily costs of materials and transportation expenses, relating to deferred revenue from the Company’s parts cleaning services, containerized waste services and vacuum services are capitalized and deferred. The deferred costs are included in current assets in the consolidated balance sheet and expensed when the related revenues are recognized.

Recent Accounting Pronouncements

In July 2013, the Financial Accounting Standards Board (“FASB”) issued 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 guidance is effective for the Company on January 1, 2014. Management does not expect the adoption of this standard to have a significant impact on the Company's consolidated balance sheets.

In February 2013, the FASB issued ASU 2013-02 Comprehensive Income (Topic 220) - Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income. The new guidance requires an entity to provide information about the amounts reclassified out of accumulated other comprehensive income (“AOCI”) by component. Entities are required to present, either on the face of the income statement where net income is presented or in the notes, significant amounts reclassified out of AOCI by respective line items of net income if the amount reclassified is required under U.S. GAAP to be reclassified to net income in its entirety in the same reporting period. For other amounts that are not required to be reclassified in their entirety to net income, entities are required to cross-reference the disclosures required under U.S. GAAP that provide additional detail about those amounts. This guidance is effective prospectively for annual and interim reporting periods beginning after December 31, 2012. The Company adopted the standard on January 1, 2013. The amounts required to be disclosed under this guidance are disclosed in Note 14, “Accumulated Other Comprehensive Income.”

Reclassifications

The Company's revenues and cost of revenues in the consolidated statements of income for the three and nine months ended September 30, 2012 and the changes in assets and liabilities, net of acquisitions in the consolidated statements of cash flows for the nine months ended September 30, 2012 have been reclassified to conform to the current year presentation.

(3) BUSINESS COMBINATIONS

Evergreen Oil, Inc.

On September 13, 2013, Safety-Kleen, Inc. acquired 100% of the outstanding common shares of Evergreen Oil, Inc. (“Evergreen”) for approximately $57.0 million. The purchase price consisted of an all-cash purchase price of $60.5 million, less a $3.5 million adjustment for the amount by which the estimated net working capital (as defined in the stock purchase agreement) of Evergreen on the closing date was less than $1.0 million. The purchase price is subject to adjustment upon finalization of Evergreen’s net working capital balance as of the closing date. Goodwill of $2.8 million and $0.4 million has been recorded on a preliminary basis in the Oil Re-refining and Recycling and SK Environmental Services segments, respectively, and will not be deductible for tax purposes. Evergreen, headquartered in Irvine, California, specializes in the recovery and re-refining of used oil and is currently the second-largest collector of used oil in California. 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 Company believes Evergreen is a good strategic fit, enabling Clean Harbors to further (i) penetrate the small quantity waste generator market, (ii) expand its oil re-refining, oil recycling and waste treatment capabilities, (iii) increase the waste volumes into its existing waste disposal treatment network, (v) enhance its commitment to sustainability, (vi) leverage the combined sales forces to maximize cross-selling opportunities, and (viii) leverage operating efficiencies through the combined company.

Safety-Kleen, Inc.

On December 28, 2012, the Company acquired 100% of the outstanding common shares of Safety-Kleen for approximately $1.3 billion. The purchase price consisted of an all-cash purchase price of $1.25 billion, plus a $13.3 million adjustment for the amount by which the net working capital (excluding cash) of Safety-Kleen on the closing date exceeded $50.0 million. The Company incurred acquisition-related costs of approximately $0.9 million and $2.2 million in connection with the transaction which are included in selling, general and administrative expenses in the consolidated statements of income for the three and nine months

7

ended September 30, 2013, respectively. The Company financed the purchase through a combination of approximately $300.0 million of existing cash, $369.3 million in net proceeds from the Company's public offering of 6.9 million shares of Clean Harbors common stock, and approximately $589.0 million in net proceeds from the Company's private debt offering of $600.0 million of 5.125% senior unsecured notes due 2021. Safety-Kleen, headquartered in Richardson, Texas, is the largest re-refiner and recycler of used oil in North America and a leading provider of parts cleaning and environmental services to commercial, industrial and automotive customers. In conjunction with the transaction, Safety-Kleen, Inc. and its subsidiaries became wholly-owned subsidiaries of Clean Harbors.

The fair value of all the acquired identifiable assets and liabilities summarized below is provisional pending finalization of the Company's acquisition accounting. Measurement period adjustments reflect new information obtained about facts and circumstances that existed as of the acquisition date. The Company believes that such preliminary allocations provide a reasonable basis for estimating the fair values of assets acquired and liabilities assumed, but the Company is waiting for additional information necessary to finalize fair value. The Company expects to finalize the valuation and complete the purchase price allocation as soon as practicable but no later than one year from the acquisition date. As the measurement period adjustments are not material to the consolidated balance sheets as of December 31, 2012 nor are they material to the amounts reported in the consolidated statements of income and consolidated statement of cash flows for the three and nine months ended September 30, 2013, the adjustments have been recorded on a prospective basis. Final determination of the fair value may result in further adjustments to the values presented below. The following table summarizes the recognized amounts of identifiable assets acquired and liabilities assumed (in thousands).

	Preliminary Allocations			Year-to-Date Measurement Period Adjustments			Current Estimate of Allocations
Inventories and supplies	$	102,339		$	5,037		$	107,376
Other current assets (i)	152,245			319			152,564
Property, plant and equipment	514,712			779			515,491
Permits and other intangibles	421,400			4,577			425,977
Other assets	4,985			(1,111		)	3,874
Current liabilities	(192,652		)	(5,081		)	(197,733		)
Closure and post-closure liabilities, less current portion	(15,774		)	8,221			(7,553		)
Remedial liabilities, less current portion	(38,370		)	(10,577		)	(48,947		)
Deferred taxes, unrecognized tax benefits and other long-term liabilities	(128,375		)	7,178			(121,197		)
Total identifiable net assets	820,510			9,342			829,852
Goodwill (ii)	436,749			(3,317		)	433,432
Total	$	1,257,259		$	6,025		$	1,263,284

_______________________

(i) The fair value of the assets acquired includes customer receivables with a preliminary aggregate fair value of $133.7 million. Combined gross amounts due were $143.7 million.

(ii) Goodwill represents the excess of the fair value of the net assets acquired over the purchase price. Goodwill of $214.1 million, $147.3 million, $69.9 million, and $2.1 million has been recorded on a preliminary basis in the Oil Re-refining and Recycling, SK Environmental Services, Industrial and Field Services and Technical Services segments, respectively. None of the goodwill related to this acquisition will be deductible for tax purposes.    

The Company has determined that the separate disclosure of Safety-Kleen's revenues and earnings is impracticable for the three and nine months ended September 30, 2013 due to the integration of Safety-Kleen's operations into the Company upon acquisition.

8

The following unaudited pro forma combined summary financial information presented below gives effect to the following transactions as if they had occurred as of January 1, 2011, and assumes that there were no material, non-recurring pro forma adjustments directly attributable to: (i) the acquisition of Safety-Kleen, (ii) the sale of 6.9 million shares of the Company's common stock, (iii) the issuance of $600.0 million aggregate principal amount of 5.125% senior unsecured notes due 2021, and (iv) the payment of related fees and expenses (in thousands):

	For the Three Months Ended		For the Nine Months Ended
	September 30, 2012		September 30, 2012
Pro forma combined revenues	$	851,376	$	2,691,025
Pro forma combined net income	$	13,480	$	90,546

This pro forma financial information is not necessarily indicative of the Company's consolidated operating results that would have been reported had the transactions been completed as described herein, nor is such information necessarily indicative of the Company's consolidated results for any future period.

Other 2012 Acquisitions

The Company acquired (i) during the second quarter of 2012, all of the outstanding stock of a privately owned Canadian company which provides workforce accommodations, camp catering and fresh food services; (ii) during the third quarter of 2012, certain assets of a privately owned U.S. company that is engaged in the business of materials handling services that includes a variety of support equipment to provide customers with a sole source for any dredging and dewatering project; and (iii) during the fourth quarter of 2012, the shares and assets of certain subsidiaries of a privately owned company that is engaged in the business of providing catalyst loading and unloading services in the United States and Canada. The combined purchase price for these acquisitions was approximately $108.9 million, including the assumption and payment of debt of $7.7 million and post-closing adjustments of $2.1 million based upon finalization of the working capital balances as of the closing date. Management has 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 September 30, 2013, the Company had finalized the acquisition accounting of the identified acquired assets and liabilities for the other 2012 acquisitions, the impact of which was not material to the financial statements. The following table summarizes the recognized amounts of identifiable assets acquired and liabilities assumed (in thousands).

	Preliminary Allocations			Year-to-Date Measurement Period Adjustments			Final Allocations
Current assets (i)	$	20,270		$	117		$	20,387
Property, plant and equipment	51,901			(8		)	51,893
Customer relationships and other intangibles	21,770			(1		)	21,769
Other assets	53			4			57
Current liabilities	(5,277		)	(22		)	(5,299		)
Other liabilities	(5,133		)	(79		)	(5,212		)
Total identifiable net assets	83,584			11			83,595
Goodwill (ii)	23,956			1,308			25,264
Total	$	107,540		$	1,319		$	108,859

______________________

(i) The fair value of the financial assets acquired included customer receivables with an aggregate fair value of $13.2 million. Combined gross amounts due were $13.5 million.  

(ii) Goodwill represents the excess of the fair value of the net assets acquired over the purchase price attributed to expected operating and cross selling synergies. The goodwill has been assigned to the Industrial and Field Services segment and will not be deductible for tax purposes.

The following unaudited pro forma combined financial data presents information as if the 2012 acquisitions had been acquired as of January 1, 2011 and assumes that there were no material, non-recurring pro forma adjustments directly attributable to

9

those acquisitions. The pro forma financial information does not necessarily reflect the actual results that would have been reported had the Company and those three acquisitions been combined during the periods presented, nor is it necessarily indicative of the future results of operations of the combined companies (in thousands).

	For the Three Months Ended		For the Nine Months Ended
	September 30, 2012		September 30, 2012
Pro forma combined revenues	$	545,393	$	1,698,246
Pro forma combined net income	$	11,982	$	72,351

Acquisition-related costs of $0.2 million for the other 2012 acquisitions were included in selling, general and administrative expenses in the Company's consolidated statements of income for the nine months ended September 30, 2013.

(4) FAIR VALUE MEASUREMENTS

The Company’s financial instruments consist of cash and cash equivalents, marketable securities, receivables, trade payables, auction rate securities, derivative financial instruments and long-term debt. The estimated fair value of cash equivalents, receivables, and trade payables approximate their carrying value due to the short maturity of these instruments and are deemed to be Level 2 in the fair value hierarchy. The fair value of the Company’s unsecured senior notes (due 2020 and 2021) at September 30, 2013 were $780.9 million and $573.1 million, respectively, and at December 31, 2012 were $816.0 million and $623.5 million, respectively, based on quoted market prices or available market data. The senior unsecured notes fair value is Level 2 in the fair value hierarchy.

The Company's assets measured at fair value on a recurring basis at September 30, 2013 and December 31, 2012 were as follows (in thousands):

September 30, 2013
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Balance at September 30, 2013
Assets:
Auction rate securities (i)	$	—	$	—	$	4,352	$	4,352
Derivative instruments (ii)	$	—	$	60	$	—	$	60
Marketable securities (iii)	$	11,787	$	—	$	—	$	11,787
Liabilities:
Derivative instruments (ii)	$	—	$	239	$	—	$	239

December 31, 2012
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Balance at December 31, 2012
Assets:
Auction rate securities (i)	$	—	$	—	$	4,354	$	4,354
Derivative instruments (ii)	$	—	$	165	$	—	$	165
Marketable securities (iii)	$	11,778	$	—	$	—	$	11,778
Liabilities:
Derivative instruments (ii)	$	—	$	1,242	$	—	$	1,242

________________________________________________

(i) The auction rate securities are classified as available-for-sale and the fair value of these securities was estimated utilizing a probability discounted cash flow analysis. As of September 30, 2013, all of the Company's auction rate securities continue to have AAA underlying ratings. The Company attributes the $0.3 million decline in the fair value of the securities from the original cost basis to external liquidity issues rather than credit issues. The

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Company assessed the decline in value to be temporary because it does not intend to sell and it is more likely than not that the Company will not have to sell the securities before their maturity. During the nine months ended September 30, 2013 and 2012, the Company recorded an unrealized pre-tax loss of less than $0.1 million and a pre-tax gain of $0.1 million, respectively, on its auction rate securities. 

(ii) The fair value of derivatives is recorded based on the present value of cash flows using a crude oil forward rate curve.

(iii) The fair value of marketable securities is recorded based on quoted market prices and changes in fair value were included in other comprehensive income.

The following table presents the changes in the Company’s auction rate securities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) during the three and nine months ended September 30, 2013 and 2012 (in thousands):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2013		2012		2013			2012
Balance at beginning of period	$	4,352	$	4,326	$	4,354		$	4,245
Unrealized (loss) gain included in other comprehensive income	—		—		(2		)	81
Balance at September 30,	$	4,352	$	4,326	$	4,352		$	4,326

Derivative Financial Instruments

The Company acquired several commodity derivatives with the Safety-Kleen acquisition on December 28, 2012. The Company uses commodity derivatives to manage against significant fluctuations in oil and oil derivative commodity prices and indices, specifically the ICIS-LOR rate and 6-oil index. All commodity derivatives are comprised of cashless collar contracts related to crude oil prices, pursuant to which the Company sells a call to a bank and then purchases a put from the same bank. The derivative instruments are not designated as hedges and expire in 2013 and 2014. The following table presents the fair value for those assets and liabilities measured at fair value as of September 30, 2013 (fair value amounts in thousands):

Financial Institution	Trade Date	Start Date	End Date	Barrels of oil per Month	Commodity	Floor		Cap		Upfront Costs	Fair Value as of September 30, 2013
Bank of America	2/7/2013	4/1/2014	4/30/2014	148,810	Brent	$	75.00	$	134.70	—	$	24
Bank of America	4/2/2013	6/1/2014	6/30/2014	148,810	Brent	75.00		130.00		—	21
Bank of America	9/11/2013	11/1/2014	11/28/2014	148,810	Brent	75.00		124.00		—	15
Total derivative instrument asset											$	60
JP Morgan	9/11/2012	11/1/2013	11/30/2013	148,810	Brent	$	75.00	$	137.50	—	$	3
JP Morgan	12/7/2012	2/1/2014	2/28/2014	148,810	Brent	75.00		124.70		—	33
JP Morgan	3/7/2013	5/1/2014	5/31/2014	148,810	Brent	75.00		125.75		—	10
JP Morgan	5/6/2013	7/1/2014	7/31/2014	148,810	Brent	75.00		122.00		—	37
JP Morgan	7/8/2013	9/1/2014	9/30/2014	148,810	Brent	75.00		120.75		—	39
Bank of America	8/3/2012	10/1/2013	10/31/2013	148,810	Brent	75.00		130.00		—	—
Bank of America	10/4/2012	12/1/2013	12/31/2013	148,810	Brent	75.00		127.50		—	14
Bank of America	11/9/2012	1/1/2014	1/31/2014	148,810	Brent	75.00		130.00		—	13
Bank of America	1/8/2013	3/1/2014	3/31/2014	148,810	Brent	75.00		129.00		—	10
Bank of America	6/10/2013	8/1/2014	8/29/2014	148,810	Brent	75.00		120.65		—	66
Bank of America	8/13/2013	10/1/2014	10/31/2014	148,810	Brent	75.00		122.60		—	14
Total derivative instrument liability											$	239

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Total derivative instrument asset and total derivative instrument liability as noted in the table above are included in the consolidated balance sheets as a component of prepaid expenses and other current assets and accrued expenses, respectively.

(5) INVENTORIES AND SUPPLIES

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

	September 30,		December 31,
	2013		2012
Oil and oil products	$	63,450	$	77,735
Supplies and drums	61,888		63,540
Solvent and solutions	11,508		9,398
Other	18,455		20,768
Total inventories and supplies	$	155,301	$	171,441

(6) PROPERTY, PLANT AND EQUIPMENT

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

	September 30,		December 31,
	2013		2012
Land	$	100,133	$	106,037
Asset retirement costs (non-landfill)	10,748		10,450
Landfill assets	93,104		77,952
Buildings and improvements	324,646		329,617
Camp equipment	135,377		135,827
Vehicles	419,581		385,172
Equipment	1,164,838		1,061,090
Furniture and fixtures	5,244		6,757
Construction in progress	129,385		31,780
	2,383,056		2,144,682
Less - accumulated depreciation and amortization	767,629		612,919
Total property, plant and equipment, net	$	1,615,427	$	1,531,763

(7) GOODWILL AND OTHER INTANGIBLE ASSETS

The changes to goodwill for the nine months ended September 30, 2013 were as follows (in thousands):

	2013
Balance at January 1, 2013	$	593,771
Acquired from acquisitions	3,179
Decrease from adjustments during the measurement period related to acquisitions	(2,009		)
Foreign currency translation	(4,789		)
Balance at September 30, 2013	$	590,152

The goodwill related to the acquisition of Safety-Kleen in 2012 and Evergreen in 2013 includes estimates that are subject to change based upon final fair value determinations.     

The Company assesses goodwill for impairment at least on an annual basis as of December 31, or when events or changes in the business environment indicate that the carrying value of the reporting unit may exceed its fair value, by comparing the fair value of each reporting unit to its carrying value, including goodwill.

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

	September 30, 2013							December 31, 2012
	Cost		Accumulated Amortization		Net		Weighted Average Remaining Amortization Period (in years)	Cost		Accumulated Amortization		Net		Weighted Average Remaining Amortization Period (in years)
Permits	$	157,578	$	49,818	$	107,760	18.8	$	148,661	$	46,282	$	102,379	21.8
Customer and supplier relationships	377,334		46,372		330,962		12.5	372,751		27,739		345,012		13.2
Other intangible assets	28,097		14,548		13,549		3.5	22,027		12,121		9,906		3.6
Total amortizable permits and other intangible assets	563,009		110,738		452,271		12.5	543,439		86,142		457,297		13.6
Trademarks and trade names	115,505		—		115,505		Indefinite	115,520		—		115,520		Indefinite
Total permits and other intangible assets	$	678,514	$	110,738	$	567,776		$	658,959	$	86,142	$	572,817

Below is the expected future amortization of the net carrying amount of finite lived intangible assets at September 30, 2013 (in thousands):

Years Ending December 31,	Expected Amortization
2013 (three months)	$	10,816
2014	42,308
2015	40,704
2016	39,210
2017	36,528
Thereafter	282,705
	$	452,271

(8) ACCRUED EXPENSES

Accrued expenses consisted of the following (in thousands):

	September 30, 2013		December 31, 2012
Insurance	$	54,105	$	48,243
Interest	17,900		20,061
Accrued disposal costs	1,498		1,835
Accrued compensation and benefits	71,030		70,250
Income, real estate, sales and other taxes	54,403		35,640
Other	57,877		56,400
Total accrued expenses	$	256,813	$	232,429

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(9) CLOSURE AND POST-CLOSURE LIABILITIES

The changes to closure and post-closure liabilities (also referred to as “asset retirement obligations”) for the nine months ended September 30, 2013 were as follows (in thousands):

	Landfill Retirement Liability			Non-Landfill Retirement Liability			Total
Balance at January 1, 2013	$	26,658		$	27,590		$	54,248
Liabilities assumed in acquisitions	—			659			659
Adjustments during the measurement period related to acquisitions	—			(10,201		)	(10,201		)
New asset retirement obligations	3,321			—			3,321
Accretion	2,255			1,281			3,536
Changes in estimates recorded to statement of income	(398		)	99			(299		)
Changes in estimates recorded to balance sheet	299			—			299
Expenditures	(3,527		)	(310		)	(3,837		)
Currency translation and other	(152		)	(80		)	(232		)
Balance at September 30, 2013	$	28,456		$	19,038		$	47,494

All of the landfill facilities included in the above were active as of September 30, 2013. New asset retirement obligations incurred during the first nine months of 2013 were discounted at the credit-adjusted risk-free rate of 6.60%. There were no significant charges (benefits) in 2013 resulting from changes in estimates for closure and post-closure liabilities.

(10) REMEDIAL LIABILITIES

The changes to remedial liabilities for the nine months ended September 30, 2013 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, 2013	$	5,829		$	71,079		$	90,312		$	167,220
Liabilities assumed in acquisitions	—			—			2,384			$	2,384
Adjustments during the measurement period related to acquisitions	—			8,855			3,726			12,581
Accretion	210			2,505			2,377			5,092
Changes in estimates recorded to statement of income	(62		)	(2,341		)	285			(2,118		)
Expenditures	(67		)	(6,307		)	(5,717		)	(12,091		)
Currency translation and other	(108		)	(54		)	(815		)	(977		)
Balance at September 30, 2013	$	5,802		$	73,737		$	92,552		$	172,091

The benefit resulting from changes in remedial liability estimates for inactive sites was primarily due to reevaluating and removing certain compensation costs related to one site as a result of recently receiving site closure approval.

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(11) FINANCING ARRANGEMENTS

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

	September 30, 2013		December 31, 2012
Senior unsecured notes, at 5.25%, due August 1, 2020	$	800,000	$	800,000
Senior unsecured notes, at 5.125%, due June 1, 2021	600,000		600,000
Revolving credit facility, due January 17, 2018	—		—
Long-term obligations	$	1,400,000	$	1,400,000

On January 17, 2013, the Company increased its revolving credit facility to provide for maximum borrowings of up to $400.0 million (with a $325.0 million sub-limit for letters of credit). At September 30, 2013, the revolving credit facility had no outstanding loans, $262.3 million available to borrow and $137.7 million of letters of credit outstanding.

The financing arrangements and principal terms of the Company's $800.0 million principal amount of 5.25% senior unsecured notes due 2020 ("2020 Notes") and $600.0 million principal amount of 5.125% senior unsecured notes due 2021 ("2021 Notes") which were outstanding at September 30, 2013, and the Company's amended $400.0 million revolving credit facility, are discussed further in Note 11, “Financing Arrangements,” in the Company's Annual Report on Form 10-K for the year ended December 31, 2012.

(12) INCOME TAXES

The Company’s effective tax rate for the three and nine months ended September 30, 2013 was 34.7% and 34.5%, respectively, compared to 33.8% and 35.6% for the same periods in 2012.

As of September 30, 2013, the Company had recorded $3.9 million of liabilities for unrecognized tax benefits and $1.6 million of interest. As of December 31, 2012, the Company had recorded $3.5 million of liabilities for unrecognized tax benefits and $1.4 million of interest. 

Due to expiring statute of limitation periods, the Company believes that total unrecognized tax benefits will decrease by approximately $3.8 million within the next twelve months. The $3.8 million (which includes interest of $1.3 million) is related to various foreign and state tax laws and, if realized, will be recorded in earnings and therefore will impact the effective income tax rate.

In September 2013, the Internal Revenue Service released final Tangible Property Regulations (the “Final Regulations”). The Final Regulations provide guidance on applying Regulation Section 1.263(a) of the Internal Revenue Code (“IRC”) to amounts paid to acquire, produce or improve tangible property, as well as rules for materials and supplies (IRC Regulation Section 1.162). These regulations contain certain changes from the temporary and proposed tangible property regulations that were issued on December 23, 2011. The Final Regulations are generally effective for taxable years beginning on or after January 1, 2014. In addition, taxpayers are permitted to early adopt the Final Regulations for taxable years beginning on or after January 1, 2012. The Company does not expect the Final Regulations to have a material effect on its results of operations or cash flows. The Company is currently evaluating the impact on its consolidated balance sheets. 

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(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				Nine Months Ended
	September 30,				September 30,
	2013		2012		2013		2012
Numerator for basic and diluted earnings per share:
Net income	$	35,361	$	12,359	$	68,765	$	67,800
Denominator:
Basic shares outstanding	60,610		53,374		60,542		53,303
Dilutive effect of equity-based compensation awards	150		191		150		216
Dilutive shares outstanding	60,760		53,565		60,692		53,519
Basic earnings per share:	$	0.58	$	0.23	$	1.14	$	1.27
Diluted earnings per share:	$	0.58	$	0.23	$	1.13	$	1.27

For the three and nine months ended September 30, 2013, the dilutive effect of all then outstanding options, restricted stock and performance awards is included in the EPS calculations above except for 173,000 outstanding performance stock awards for which the performance criteria were not attained at that time. For the three and nine months ended September 30, 2012, the EPS calculations above include the dilutive effects of all then outstanding options, restricted stock, and performance awards except for 66,000 outstanding performance stock awards for which the performance criteria were not attained at that time.

(14) ACCUMULATED OTHER COMPREHENSIVE INCOME

Other comprehensive income (loss) includes translation adjustments of foreign currency financial statements, unrealized gains (losses) on available-for-sale securities and changes in unfunded pension liabilities. The components of other comprehensive income (loss) and related tax effects for the three and nine months ended September 30, 2013 and 2012 were as follows (in thousands):

	For the Three Months Ended							For the Three Months Ended
	September 30, 2013							September 30, 2012
	Gross		Tax Effect			Net of Tax		Gross		Tax Effect			Net of Tax
Foreign currency translation	$	20,731	$	—		$	20,731	$	29,086	$	—		$	29,086
Unrealized gain (loss) on available-for-sale securities	1,227		(153		)	1,074		1,040		(146		)	894
Other comprehensive income (loss)	$	21,958	$	(153	)	$	21,805	$	30,126	$	(146	)	$	29,980

	For the Nine Months Ended									For the Nine Months Ended
	September 30, 2013									September 30, 2012
	Gross			Tax Effect			Net of Tax			Gross		Tax Effect			Net of Tax
Foreign currency translation	$	(37,921	)	$	—		$	(37,921	)	$	27,393	$	—		$	27,393
Unrealized gain (loss) on available-for-sale securities	420			(61		)	359			373		(63		)	310
Other comprehensive income (loss)	$	(37,501	)	$	(61	)	$	(37,562	)	$	27,766	$	(63	)	$	27,703

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The components of accumulated other comprehensive income, net of tax, were as follows (in thousands):

	Foreign Currency Translation			Unrealized Gain (Loss) on Available-For-Sale Securities		Unfunded Pension Liability			Total
Balance at January 1, 2013	$	50,627		$	660	$	(1,655	)	$	49,632
Other comprehensive loss, net of tax	(37,921		)	359		—			(37,562		)
Balance at September 30, 2013	$	12,706		$	1,019	$	(1,655	)	$	12,070

There were no reclassifications to net income from accumulated other comprehensive income during the three and nine months ended September 30, 2013.

(15) STOCK-BASED COMPENSATION

The following table summarizes the total number and type of awards granted during the three and nine months ended September 30, 2013, as well as the related weighted-average grant-date fair values:

	Three Months Ended			Nine Months Ended
	September 30, 2013			September 30, 2013
	Shares	Weighted Average Grant-Date Fair Value		Shares	Weighted Average Grant-Date Fair Value
Restricted stock awards	27,890	$	57.88	287,882	$	55.21
Performance stock awards	1,468	$	55.29	114,453	$	54.27
Total awards	29,358			402,335

(16) COMMITMENTS AND CONTINGENCIES

Legal and Administrative Proceedings

The Company’s waste management services 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 applications for permits and licenses by the Company and conformity with legal requirements, alleged violations of existing permits and licenses, or alleged responsibility arising 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 prior owners of certain of the Company’s facilities shipped wastes. 

At September 30, 2013 and December 31, 2012, the Company had recorded reserves of $41.8 million and $38.6 million, respectively, in the Company's financial statements for actual or probable liabilities related to the legal and administrative proceedings in which the Company was then involved, the principal of which are described below. At September 30, 2013 and December 31, 2012, the Company also believed that it was reasonably possible that the amount of these potential liabilities could be as much as $3.4 million and $3.5 million more, respectively. The Company periodically adjusts the aggregate amount of these reserves when these actual or probable liabilities are paid or otherwise discharged, new claims arise, or additional relevant information about existing or probable claims becomes available. As of September 30, 2013, the $41.8 million of reserves consisted of (i) $35.1 million related to pending legal or administrative proceedings, including Superfund liabilities, which were included in remedial liabilities on the consolidated balance sheets and (ii) $6.7 million primarily related to federal and state enforcement actions, which were included in accrued expenses on the consolidated balance sheets.

As of September 30, 2013, the principal legal and administrative proceedings in which the Company was involved, or which had been terminated during 2013, 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

17

lagoons on the property. By 1972, groundwater contamination had been identified, and the Quebec government provided an alternate water supply to the municipality of Ville Mercier.

In 1999, Ville Mercier and three neighboring municipalities filed separate legal proceedings against the Mercier Subsidiary and the Government of Quebec. The lawsuits assert that the defendants are jointly and severally responsible for the contamination of groundwater in the region, which they claim caused each municipality to incur additional costs to supply drinking water for their citizens since the 1970's and early 1980's. The four municipalities claim a Canadian dollar ("CDN") total of $1.6 million as damages for additional costs to obtain drinking water supplies and seek an injunctive order to obligate the defendants to remediate the groundwater in the region. The Quebec Government also sued the Mercier Subsidiary to recover approximately $17.4 million (CDN) of alleged past costs for constructing and operating a treatment system and providing alternative drinking water supplies.

On September 26, 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 September 30, 2013 and December 31, 2012, the Company had accrued $13.9 million and $14.2 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-Keen has been named as a potentially responsible party as described below under “Superfund Proceedings,” the principal such legal proceedings involving Safety-Kleen which were outstanding as of September 30, 2013 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 62 proceedings (excluding cases which have been settled but not formally dismissed) as of September 30, 2013, 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 September 30, 2013. From December 31, 2012 to September 30, 2013, 26 product liability claims were settled or dismissed. Due to the nature of these claims and the related insurance, Safety-Kleen 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. Safety-Kleen disputes the basis of the claims on numerous grounds, including that Safety-Kleen has contracts with numerous customers authorizing the assessment of such fees and that in cases where no contract exists Safety-Kleen provides customers with a document at the time of service reflecting the assessment of the fee, followed by an invoice itemizing the fee. It is Safety-Kleen's position that it had the right to assess fuel surcharges, that the customers consented to the charges and that the surcharges were voluntarily paid by the customers when presented with an invoice. The lawsuit is still in its initial stages of discovery, with the focus being whether a class will be certified. The class certification-related fact discovery cutoff was September 4, 2013, and a hearing on class certification is now scheduled to be held in early to mid-2014. The plaintiff has filed a motion to extend the discovery cutoff and trial date, but the court has not ruled on these requests. In late June 2012, a nearly identical lawsuit was filed by the same law firm on behalf of a California-based customer. That lawsuit contends, under various state law theories, that Safety-Kleen impermissibly assessed fuel surcharges and late payment fees, and seeks certification of a class of California customers only. Safety-Kleen will assert the same defenses as in the Alabama litigation. In December 2012, a similar suit was filed by the same law firm on behalf of a Missouri-based customer which contends under various state law theories that Safety-Kleen impermissibly assessed fuel surcharges and seeks certification of a class of Missouri customers only.

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Safety-Kleen will assert the same defenses as in the Alabama and California cases. The Company is unable to ascertain the ultimate aggregate amount of monetary liability or financial impact with respect to these matters as of September 30, 2013, 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 122 sites which are subject to or are proposed to become subject to proceedings under federal or state Superfund laws. Of the 122 sites, two involve facilities that are now owned by the Company and 120 involve third party sites to which either the Company or the prior owners shipped wastes. 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 such indemnification provisions, for cleanup and remediation costs, related legal and consulting costs associated with PRP investigations, settlements, and related legal and administrative proceedings. The amount of such actual and potential liability is inherently difficult to estimate because of, among other relevant factors, uncertainties as to the legal liability (if any) of the Company or the prior owners of certain of the Company's facilities to contribute a portion of the cleanup costs, the assumptions that must be made in calculating the estimated cost and timing of remediation, the identification of other PRPs and their respective capability and obligation to contribute to remediation efforts, and the existence and legal standing of indemnification agreements (if any) with prior owners, which may either benefit the Company or subject the Company to potential indemnification obligations.

The Company's potential liability for cleanup costs at the two facilities now owned by the Company and at 35 (the "Listed Third Party Sites") of the 120 third party sites arose out of the Company's 2002 acquisition of substantially all of the assets (the "CSD assets") of the Chemical Services Division of Safety-Kleen Corp. As part of the purchase price for the CSD assets, the Company became liable as the owner of these two facilities and also agreed to indemnify the prior owners of the CSD assets against their share of certain cleanup costs for the Listed Third Party Sites payable to governmental entities under federal or state Superfund laws. Of the 35 Listed Third Party Sites, six are currently requiring expenditures on remediation, 13 are now settled, and 16 are not currently requiring expenditures on remediation. The status of the two facilities owned by the Company (the Wichita Property and the BR Facility) are further described below.

The 120 Superfund sites described above include 69 sites for which the Company had been notified it is a PRP or potential PRP prior to the Company's acquisition of Safety-Kleen on December 28, 2012, and an additional 50 sites at which Safety-Kleen had been notified it is a PRP or potential PRP prior to such acquisition. The total number of Superfund sites at which the Company had at September 30, 2013 potential liability and the total dollar amount of such estimated liability relating to those sites as described above have been increased to reflect the additional potential Superfund liabilities to which the Company became subject as a result of the Safety-Kleen acquisition. One of the third party sites (the Marine Shale site) is further described below.

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 its 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 as part of the CSD assets 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.

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Marine Shale Site.    Prior to 1996, Marine Shale Processors, Inc. ("Marine Shale") operated a kiln in Amelia, Louisiana which incinerated waste producing a vitrified aggregate as a by-product. Marine Shale contended that its operation recycled waste into a useful product, i.e., vitrified aggregate, and therefore was exempt from regulation under the RCRA and permitting requirements as a hazardous waste incinerator under applicable federal and state environmental laws. The EPA contended that Marine Shale was a "sham-recycler" subject to the regulation and permitting requirements as a hazardous waste incinerator under the U.S. Resource Conservation and Recovery Act ("RCRA"), that its vitrified aggregate by-product was a hazardous waste, and that Marine Shale's continued operation without required permits was illegal. Litigation between the EPA and Marine Shale began in 1990 and continued until July 1996, when the U.S. Fifth Circuit Court of Appeals ordered Marine Shale to shut down its operations.

Certain of the former owners of the CSD assets were major customers of Marine Shale, but the Marine Shale site was not included as a Listed Third Party Site in connection with the Company's acquisition of the CSD assets and Clean Harbors was never a customer of Marine Shale. A Safety-Kleen subsidiary was, however, a Marine Shale customer and has been named a PRP. On May 11, 2007, the EPA and the LDEQ issued a special notice to the Company and other PRPs, seeking a good faith offer to address site remediation at the former Marine Shale facility. The Company has joined with other parties to form a group (the "Site Group") to retain common counsel and participate in further negotiations with the EPA and the LDEQ directed towards the eventual remediation of the Marine Shale site. The Site Group made a good faith settlement offer to the EPA on November 29, 2007, and negotiations among the EPA, the LDEQ and the Site Group with respect to the Marine Shale site are ongoing. At September 30, 2013 and December 31, 2012, the amount of the Company's reserves relating to the Marine Shale site were $4.5 million and $4.4 million, respectively.

Certain Other Third Party Sites.    At 11 of the 120 third party sites, Clean Harbors has an indemnification agreement with ChemWaste, a former subsidiary of Waste Management, Inc., and at five additional of those 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 120 third party sites discussed above. In addition to the Wichita Property, the BR Facility and Marine Shale, Clean Harbors has 12 sites at which it believes its potential liability could exceed $100,000.

Federal, State and Provincial Enforcement Actions

From time to time, the Company pays fines or penalties in regulatory proceedings relating primarily to waste treatment, storage or disposal facilities. As of September 30, 2013 and December 31, 2012, there were five and four 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 first quarter of 2013, the Company adjusted its operating segments to integrate the business activities of Safety-Kleen, acquired in December 2012, and to incorporate other changes made in 2013 to the manner in which the Company manages its business, makes operating decisions and assesses its performance. The Company's operations are now managed in five reportable segments: Technical Services, Oil Re-refining and Recycling, SK Environmental Services, Industrial and Field Services and Oil and Gas Field Services. The prior year segment information has been recast to conform to the current year presentation.

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 are loss on early extinguishment of debt, other income (expense) and income from discontinued operations, net of tax as these amounts are not considered part of usual business operations. Transactions between the segments are accounted for at the Company’s estimate of fair value based on similar transactions with outside customers. 

The operations not managed through the Company’s five 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 five 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

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general corporate nature that are not allocated to the Company’s five reportable segments. Corporate Items revenues for the nine months ended September 30, 2013 includes a one-time, non-cash reduction of approximately $10.2 million due to the impact of acquisition accounting adjustments on Safety-Kleen's historical deferred revenue balance at December 28, 2012. The revenue amounts of the five reportable segments for the nine months ended September 30, 2013 exclude such adjustments to maintain comparability with future operating results and reflect how the Company manages the business.

The following table reconciles third party revenues to direct revenues for the three and nine months ended September 30, 2013 and 2012 (in thousands). Third party revenue is revenue billed to outside customers by a particular segment. Direct revenue is the revenue allocated to the segment performing the provided service. The Company analyzes results of operations based on direct revenues because the Company believes that these revenues and related expenses best reflect the manner in which operations are managed. 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.

	For the Three Months Ended September 30, 2013
	Technical Services		Oil Re-refining and Recycling			SK Environmental Services		Industrial and Field Services			Oil and Gas Field Services			Corporate Items			Totals
Third party revenues	$	269,465	$	151,565		$	150,535	$	227,754		$	107,627		$	589		$	907,535
Intersegment revenues, net	35,406		(64,918		)	36,516		(7,322		)	318			—			—
Corporate Items, net	964		—			—		73			(114		)	(923		)	—
Direct revenues	$	305,835	$	86,647		$	187,051	$	220,505		$	107,831		$	(334	)	$	907,535

	For the Three Months Ended September 30, 2012
	Technical Services		Oil Re-refining and Recycling		SK Environmental Services		Industrial and Field Services			Oil and Gas Field Services			Corporate Items			Totals
Third party revenues	$	247,355	$	—	$	—	$	203,371		$	82,812		$	268		$	533,806
Intersegment revenues, net	6,951		—		—		(8,877		)	1,926			—			—
Corporate Items, net	665		—		—		100			(98		)	(667		)	—
Direct revenues	$	254,971	$	—	$	—	$	194,594		$	84,640		$	(399	)	$	533,806

	For the Nine Months Ended September 30, 2013
	Technical Services		Oil Re-refining and Recycling			SK Environmental Services		Industrial and Field Services			Oil and Gas Field Services			Corporate Items			Totals
Third party revenues	$	759,666	$	438,191		$	453,325	$	693,667		$	294,183		$	(8,806	)	$	2,630,226
Intersegment revenues, net	85,614		(186,053		)	126,441		(32,316		)	6,314			—			—
Corporate Items, net	3,155		—			84		184			(314		)	(3,109		)	—
Direct revenues	$	848,435	$	252,138		$	579,850	$	661,535		$	300,183		$	(11,915	)	$	2,630,226

	For the Nine Months Ended September 30, 2012
	Technical Services		Oil Re-refining and Recycling		SK Environmental Services		Industrial and Field Services			Oil and Gas Field Services			Corporate Items			Totals
Third party revenues	$	712,313	$	—	$	—	$	608,768		$	306,566		$	1,299		$	1,628,946
Intersegment revenues, net	24,235		—		—		(31,246		)	7,011			—			—
Corporate Items, net	1,805		—		—		48			(391		)	(1,462		)	—
Direct revenues	$	738,353	$	—	$	—	$	577,570		$	313,186		$	(163	)	$	1,628,946

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The following table presents information used by management by 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 adjustments, and other (income) expense, to its segments.    

	For the Three Months Ended						For the Nine Months Ended
	September 30,						September 30,
	2013			2012			2013			2012
Adjusted EBITDA:
Technical Services	$	78,849		$	68,241		$	208,284		$	188,673
Oil Re-refining and Recycling	18,892			—			46,861			—
SK Environmental Services	22,951			—			84,162			—
Industrial and Field Services	48,096			43,278			138,638			117,914
Oil and Gas Field Services	20,854			14,132			52,372			62,299
Corporate Items	(43,690		)	(25,124		)	(149,547		)	(78,710		)
Total	$	145,952		$	100,527		$	380,770		$	290,176
Reconciliation to Consolidated Statements of Income:
Pre-tax, non-cash acquisition accounting adjustments	$	—		$	—		$	13,559		$	—
Accretion of environmental liabilities	2,914			2,488			8,628			7,409
Depreciation and amortization	69,430			41,300			196,904			116,794
Income from operations	73,608			56,739			161,679			165,973
Other expense (income)	150			91			(2,030		)	465
Loss on early extinguishment of debt	—			26,385			—			26,385
Interest expense, net of interest income	19,326			11,596			58,784			33,836
Income before provision for income taxes	$	54,132		$	18,667		$	104,925		$	105,287

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

	September 30, 2013		December 31, 2012
Property, plant and equipment, net
Technical Services	$	398,778	$	402,260
Oil Re-refining and Recycling	262,745		224,289
SK Environmental Services	193,760		195,172
Industrial and Field Services	410,776		371,335
Oil and Gas Field Services	240,863		257,985
Corporate Items	108,505		80,722
Total property, plant and equipment, net	$	1,615,427	$	1,531,763
Intangible assets:
Technical Services
Goodwill	$	47,917	$	48,157
Permits and other intangibles, net	81,689		85,842
Total Technical Services	129,606		133,999
Oil Re-refining and Recycling
Goodwill	215,816		215,704
Permits and other intangibles, net	233,259		222,182
Total Oil Re-refining and Recycling	449,075		437,886
SK Environmental Services
Goodwill	146,956		148,422
Permits and other intangibles, net	186,043		190,472
Total SK Environmental Services	332,999		338,894
Industrial and Field Services
Goodwill	140,927		141,726
Permits and other intangibles, net	36,854		41,143
Total Industrial and Field Services	177,781		182,869
Oil and Gas Field Services
Goodwill	38,536		39,762
Permits and other intangibles, net	29,931		33,178
Total Oil and Gas Field Services	68,467		72,940
Total	$	1,157,928	$	1,166,588

The following table presents total assets by reportable segment (in thousands):

	September 30, 2013		December 31, 2012
Technical Services	$	699,713	$	714,777
Oil Re-refining and Recycling	833,336		797,650
SK Environmental Services	642,557		647,746
Industrial and Field Services	645,183		607,654
Oil and Gas Field Services	310,481		348,771
Corporate Items	825,582		709,208
Total	$	3,956,852	$	3,825,806

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

	September 30, 2013		December 31, 2012
United States	$	2,665,328	$	2,564,609
Canada	1,287,090		1,260,421
Other foreign	4,434		776
Total	$	3,956,852	$	3,825,806

(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 wholly-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 September 30, 2013 (in thousands):

	Clean Harbors, Inc.		U.S. Guarantor Subsidiaries		Foreign Non-Guarantor Subsidiaries		Consolidating Adjustments			Total
Assets:
Cash and cash equivalents	$	1,006	$	187,926	$	59,703	$	—		$	248,635
Intercompany receivables	336,356		2,369		174,609		(513,334		)	—
Other current assets	12,144		589,065		291,930		—			893,139
Property, plant and equipment, net	—		942,331		673,096		—			1,615,427
Investments in subsidiaries	2,601,246		929,111		144,953		(3,675,310		)	—
Intercompany debt receivable	—		508,524		3,701		(512,225		)	—
Other long-term assets	20,842		900,617		278,192		—			1,199,651
Total assets	$	2,971,594	$	4,059,943	$	1,626,184	$	(4,700,869	)	$	3,956,852
Liabilities and Stockholders’ Equity:
Current liabilities	$	40,600	$	472,178	$	156,754	$	—		$	669,532
Intercompany payables	—		510,906		2,428		(513,334		)	—
Closure, post-closure and remedial liabilities, net	—		158,366		33,482		—			191,848
Long-term obligations	1,400,000		—		—		—			1,400,000
Capital lease obligations, net	—		231		1,438		—			1,669
Intercompany debt payable	3,701		—		508,524		(512,225		)	—
Other long-term liabilities	51,173		124,441		42,069		—			217,683
Total liabilities	1,495,474		1,266,122		744,695		(1,025,559		)	2,480,732
Stockholders’ equity	1,476,120		2,793,821		881,489		(3,675,310		)	1,476,120
Total liabilities and stockholders’ equity	$	2,971,594	$	4,059,943	$	1,626,184	$	(4,700,869	)	$	3,956,852

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Following is the condensed consolidating balance sheet at December 31, 2012 (in thousands):

	Clean Harbors, Inc.		U.S. Guarantor Subsidiaries		Foreign Non-Guarantor Subsidiaries		Consolidating Adjustments			Total
Assets:
Cash and cash equivalents	$	35,214	$	140,683	$	53,939	$	—		$	229,836
Intercompany receivables	296,023		17,704		116,571		(430,298		)	—
Other current assets	38,295		526,354		292,308		—			856,957
Property, plant and equipment, net	—		886,032		645,731		—			1,531,763
Investments in subsidiaries	2,528,699		850,011		144,953		(3,523,663		)	—
Intercompany debt receivable	—		508,067		3,701		(511,768		)	—
Other long-term assets	21,141		896,991		289,118		—			1,207,250
Total assets	$	2,919,372	$	3,825,842	$	1,546,321	$	(4,465,729	)	$	3,825,806
Liabilities and Stockholders’ Equity:
Current liabilities	$	32,586	$	402,990	$	133,476	$	—		$	569,052
Intercompany payables	—		412,594		17,704		(430,298		)	—
Closure, post-closure and remedial liabilities, net	—		161,175		36,172		—			197,347
Long-term obligations	1,400,000		—		—		—			1,400,000
Capital lease obligations, net	—		301		2,578		—			2,879
Intercompany debt payable	3,701		—		508,067		(511,768		)	—
Other long-term liabilities	51,013		134,393		39,050		—			224,456
Total liabilities	1,487,300		1,111,453		737,047		(942,066		)	2,393,734
Stockholders’ equity	1,432,072		2,714,389		809,274		(3,523,663		)	1,432,072
Total liabilities and stockholders’ equity	$	2,919,372	$	3,825,842	$	1,546,321	$	(4,465,729	)	$	3,825,806

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

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues
Service revenues	$	—		$	445,165		$	256,812		$	56		$	702,033
Product revenues	—			169,743			35,815			(56		)	205,502
Total revenues	—			614,908			292,627			—			907,535
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	—			300,859			177,519			56			478,434
Product cost of revenues	—			139,683			29,058			(56		)	168,685
Total cost of revenues	—			440,542			206,577			—			647,119
Selling, general and administrative expenses	29			81,496			32,939			—			114,464
Accretion of environmental liabilities	—			2,478			436			—			2,914
Depreciation and amortization	—			45,533			23,897			—			69,430
Income from operations	(29		)	44,859			28,778			—			73,608
Other expense	—			(111		)	(39		)	—			(150		)
Interest (expense) income	(19,844		)	137			381			—			(19,326		)
Equity in earnings of subsidiaries	58,919			21,064			—			(79,983		)	—
Intercompany dividend income (expense)	—			—			3,063			(3,063		)	—
Intercompany interest income (expense)	—			10,107			(10,107		)	—			—
Income before provision for income taxes	39,046			76,056			22,076			(83,046		)	54,132
Provision for income taxes	3,685			8,218			6,868			—			18,771
Net income	35,361			67,838			15,208			(83,046		)	35,361
Other comprehensive (loss) income	21,805			21,805			(10,072		)	(11,733		)	21,805
Comprehensive (loss) income	$	57,166		$	89,643		$	5,136		$	(94,779	)	$	57,166

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Following is the consolidating statement of income (loss) for the three months ended September 30, 2012 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues
Service revenues	$	—		$	290,295		$	218,304		$	(4,871	)	$	503,728
Product revenues	—			24,527			5,678			(127		)	30,078
Total revenues	—			314,822			223,982			(4,998		)	533,806
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	—			198,793			154,836			(4,871		)	348,758
Product cost of revenues	—			19,904			4,405			(127		)	24,182
Total cost of revenues	—			218,697			159,241			(4,998		)	372,940
Selling, general and administrative expenses	9			35,810			24,520			—			60,339
Accretion of environmental liabilities	—			2,150			338			—			2,488
Depreciation and amortization	—			20,778			20,522			—			41,300
Income from operations	(9		)	37,387			19,361			—			56,739
Other (expense) income	—			(8		)	(83		)	—			(91		)
Loss on early extinguishment of debt	(26,385		)	—			—			—			(26,385		)
Interest expense	(11,247		)	180			(529		)	—			(11,596		)
Equity in earnings of subsidiaries	50,039			15,869			—			(65,908		)	—
Intercompany dividend income (expense)	—			—			3,439			(3,439		)	—
Intercompany interest income (expense)	—			10,290			(10,290		)	—			—
Income before provision for income taxes	12,398			63,718			11,898			(69,347		)	18,667
Provision for income taxes	39			3,831			2,438			—			6,308
Net income	12,359			59,887			9,460			(69,347		)	12,359
Other comprehensive income (loss)	29,980			29,980			13,042			(43,022		)	29,980
Comprehensive income (loss)	$	42,339		$	89,867		$	22,502		$	(112,369	)	$	42,339

27

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

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues
Service revenues	$	—		$	1,295,525		$	755,856		$	(2,854	)	$	2,048,527
Product revenues	—			463,301			119,267			(869		)	581,699
Total revenues	—			1,758,826			875,123			(3,723		)	2,630,226
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	—			873,945			531,318			(2,854		)	1,402,409
Product cost of revenues	—			395,891			100,038			(869		)	495,060
Total cost of revenues	—			1,269,836			631,356			(3,723		)	1,897,469
Selling, general and administrative expenses	84			266,941			98,521			—			365,546
Accretion of environmental liabilities	—			7,315			1,313			—			8,628
Depreciation and amortization	—			127,042			69,862			—			196,904
Income from operations	(84		)	87,692			74,071			—			161,679
Other income (expense)	—			2,858			(828		)	—			2,030
Interest (expense) income	(59,408		)	137			487			—			(58,784		)
Equity in earnings of subsidiaries	134,246			57,040			—			(191,286		)	—
Intercompany dividend income (expense)	—			—			10,031			(10,031		)	—
Intercompany interest income (expense)	—			30,414			(30,414		)	—			—
Income before provision for income taxes	74,754			178,141			53,347			(201,317		)	104,925
Provision for income taxes	5,989			14,753			15,418			—			36,160
Net income	68,765			163,388			37,929			(201,317		)	68,765
Other comprehensive (loss) income	(37,562		)	(37,562		)	20,385			17,177			(37,562		)
Comprehensive (loss) income	$	31,203		$	125,826		$	58,314		$	(184,140	)	$	31,203

28

Following is the consolidating statement of income (loss) for the nine months ended September 30, 2012 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues
Service revenues	$	—		$	850,737		$	687,924		$	(14,894	)	$	1,523,767
Product revenues	—			69,364			36,608			(793		)	105,179
Total revenues	—			920,101			724,532			(15,687		)	1,628,946
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	—			575,006			496,062			(14,894		)	1,056,174
Product cost of revenues	—			55,646			29,851			(793		)	84,704
Total cost of revenues	—			630,652			525,913			(15,687		)	1,140,878
Selling, general and administrative expenses	27			122,167			75,698			—			197,892
Accretion of environmental liabilities	—			6,430			979			—			7,409
Depreciation and amortization	—			56,568			60,226			—			116,794
Income from operations	(27		)	104,284			61,716			—			165,973
Other (expense) income	—			(333		)	(132		)	—			(465		)
Loss on early extinguishment of debt	(26,385		)	—			—			—			(26,385		)
Interest expense	(32,679		)	—			(1,157		)	—			(33,836		)
Equity in earnings of subsidiaries	124,965			49,236			—			(174,201		)	—
Intercompany dividend income (expense)	10,010			—			10,354			(20,364		)	—
Intercompany interest income (expense)	—			30,894			(30,894		)	—			—
Income before provision for income taxes	75,884			184,081			39,887			(194,565		)	105,287
Provision for income taxes	8,084			19,473			9,930			—			37,487
Net income	67,800			164,608			29,957			(194,565		)	67,800
Other comprehensive income (loss)	27,703			27,703			11,370			(39,073		)	27,703
Comprehensive income (loss)	$	95,503		$	192,311		$	41,327		$	(233,638	)	$	95,503

29

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

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Total
Net cash from operating activities	$	(38,228	)	$	176,844		$	141,498		$	280,114
Cash flows from investing activities:
Additions to property, plant and equipment	—			(101,813		)	(105,828		)	(207,641		)
Proceeds from sales of fixed assets	—			819			2,881			3,700
Acquisitions, net of cash acquired	—			(59,458		)	—			(59,458		)
Costs to obtain or renew permits	—			(221		)	(4,136		)	(4,357		)
Other	—			—			(11		)	(11		)
Net cash from investing activities	—			(160,673		)	(107,094		)	(267,767		)
Cash flows from financing activities:
Change in uncashed checks	—			9,427			327			9,754
Proceeds from exercise of stock options	399			—			—			399
Proceeds from employee stock purchase plan	5,327			—			—			5,327
Remittance of shares, net	(599		)	—			—			(599		)
Excess tax benefit of stock-based compensation	1,589			—			—			1,589
Deferred financing costs paid	(2,446		)	—			—			(2,446		)
Payments on capital leases	—			(178		)	(3,918		)	(4,096		)
Issuance costs related to 2012 issuance of common stock	(250		)							(250		)
Dividends (paid) / received	—			(10,284		)	10,284			—
Interest (payments) / received	—			32,107			(32,107		)	—
Net cash from financing activities	4,020			31,072			(25,414		)	9,678
Effect of exchange rate change on cash	—			—			(3,226		)	(3,226		)
(Decrease) increase in cash and cash equivalents	(34,208		)	47,243			5,764			18,799
Cash and cash equivalents, beginning of period	35,214			140,683			53,939			229,836
Cash and cash equivalents, end of period	$	1,006		$	187,926		$	59,703		$	248,635

30

Following is the condensed consolidating statement of cash flows for the nine months ended September 30, 2012 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Total
Net cash from operating activities	$	(49,918	)	$	98,497		$	184,113		$	232,692
Cash flows from investing activities:
Additions to property, plant and equipment	—			(75,664		)	(54,662		)	(130,326		)
Proceeds from sale of fixed assets	—			3,411			779			4,190
Acquisitions, net of cash acquired	—			(51,424		)	(41,051		)	(92,475		)
Costs to obtain or renew permits	—			(625		)	(1,784		)	(2,409		)
Purchase of available for sale securities	—			—			(10,517		)	(10,517		)
Other				603			4,517			5,120
Net cash from investing activities	—			(123,699		)	(102,718		)	(226,417		)
Cash flows from financing activities:
Change in uncashed checks	—			(7,771		)	(6,184		)	(13,955		)
Proceeds from exercise of stock options	231			—			—			231
Proceeds from employee stock purchase plan	4,627			—			—			4,627
Remittance of shares, net	(1,604		)	—			—			(1,604		)
Excess tax benefit of stock-based compensation	1,786			—			—			1,786
Deferred financing costs paid	(9,638		)	—			—			(9,638		)
Payments of capital leases	—			(781		)	(4,522		)	(5,303		)
Distribution of cash earned on employee participation plan	(55		)	—			—			(55		)
Principal payment on debt	$	(520,000	)	$	—		$	—		(520,000		)
Issuance of senior unsecured notes	800,000			—			—			800,000
Dividends (paid) / received	10,010			(23,669		)	13,659			—
Interest (payments) / received	—			43,954			(43,954		)	—
Net cash from financing activities	285,357			11,733			(41,001		)	256,089
Effect of exchange rate change on cash	—			—			527			527
Increase (decrease) in cash and cash equivalents	235,439			(13,469		)	40,921			262,891
Cash and cash equivalents, beginning of period	91,581			128,071			41,071			260,723
Cash and cash equivalents, end of period	$	327,020		$	114,602		$	81,992		$	523,614

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

Forward-Looking Statements

In addition to historical information, this Quarterly Report on Form 10-Q contains forward-looking statements, which are generally identifiable by use of the words “believes,” “expects,” “intends,” “anticipates,” “plans to,” “estimates,” “projects,” or similar expressions. These forward-looking statements are subject to certain risks and uncertainties that could cause actual results to differ materially from those reflected in these forward-looking statements. Factors that might cause such a difference include, but are not limited to, those discussed under Item 1A, “Risk Factors,” in our Annual Report on Form 10-K filed with the Securities and Exchange Commission on March 6, 2013, 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 Securities and Exchange Commission.  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.

General

We are a leading provider of environmental, energy and industrial services throughout North America. 

Following our acquisition of Safety-Kleen in December 2012, we made changes in 2013 to the manner in which we manage our business, make operating decisions and assess our performance. The amounts presented for all periods herein have been recast to reflect the impact of such changes. Under the new structure, we report the business in five reportable segments, including: 

• Technical Services — provides a broad range of hazardous material management services including the packaging, collection, transportation, treatment and disposal of hazardous and non-hazardous waste at Company-owned incineration, landfill, wastewater, and other treatment facilities.

• Oil Re-refining and Recycling — processes used oil into high quality base and blended lubricating oils which are then sold to third party customers, and provides recycling of oil in excess of Safety-Kleen's current re-refining capacity into recycled fuel oil which is then sold to third parties. Processing into base and blended lubricating oils takes place in the Company's three owned and operated re-refineries and recycling of oil into recycled fuel oil takes place in one of the Company's used oil terminals.

• SK Environmental Services — provides a broad range of environmental services, such as parts cleaning, containerized waste services, oil collection, and other complementary products and services, including vacuum services, allied products and other environmental services.

• Industrial and Field Services — provides industrial and specialty services, such as high-pressure and chemical cleaning, catalyst handling, decoking, material processing, and industrial lodging services to refineries, chemical plants, oil sands facilities, pulp and paper mills, and other industrial facilities. Also provides a wide variety of environmental cleanup services on customer sites or other locations on a scheduled or emergency response basis including tank cleaning, decontamination, remediation, and spill cleanup.

• Oil & Gas Field Services — provides fluid handling, fluid hauling, production servicing, surface rentals, seismic services, and directional boring services to the energy sector serving oil and gas exploration, production, and power generation. 

Acquisition of Safety-Kleen

On December 28, 2012, we acquired 100% of the outstanding common shares of Safety-Kleen for approximately $1.3 billion. The purchase price consisted of an all-cash purchase price of $1.25 billion, plus a $7.3 million adjustment for the amount by which the estimated net working capital (excluding cash) of Safety-Kleen on the closing date exceeded $50.0 million. The purchase price is subject to adjustment upon finalization of Safety-Kleen's net working capital balance (excluding cash) as of the closing date. We financed the purchase through a combination of approximately $300.0 million of existing cash, $369.3 million in net proceeds from our public offering of 6.9 million shares of our common stock, and approximately $589.0 million in net proceeds from our private debt offering of $600.0 million of 5.125% senior unsecured notes due 2021.

Safety-Kleen, headquartered in Richardson, Texas, is the largest re-refiner and recycler of used oil in North America and a leading provider of parts cleaning and environmental services to commercial, industrial and automotive customers. In conjunction with the transaction, Safety-Kleen, Inc. and its subsidiaries became wholly-owned subsidiaries of Clean Harbors.

32

Summary of Operations

 During the three months ended September 30, 2013, our revenues were $907.5 million, compared with $533.8 million during the three months ended September 30, 2012. The 70%increase in revenue was primarily driven by our acquisition of Safety-Kleen in December 2012.

Our Technical Services revenues accounted for 34% of our total revenues for the three months ended September 30, 2013.  The year-over-year increase in revenues of 20% resulted from our acquisition of Safety-Kleen delivering high utilization and volumes into our disposal network, as well as our integration of a portion of the Safety-Kleen business into our Technical Services segment. The utilization rate at our incinerators was 93.5% for the three months ended September 30, 2013, compared with 91.3% in the comparable period of 2012, and our landfill volumes increased by approximately 7% year-over-year as a result of large-scale project work.

Our Oil Re-refining and Recycling revenues accounted for 9% of our total revenues for the three months ended September 30, 2013. During the third quarter, the pricing environment in Group II base oil was stable and posted industry prices increased by 10 cents per gallon late in the quarter. Revenue increased from the second quarter as a result of higher total volume of base oil and blended oil sales, improved base oil pricing and increased by-products sales volumes.

Our SK Environmental Services revenues accounted for 21% of our total revenues for the three months ended September 30, 2013. Demand for our containerized waste services, parts washers, vacuum services and allied products was consistent with prior quarters. In addition, our waste oil collection volumes were up slightly in the quarter, increasing 1% from second quarter levels.

Our Industrial and Field Services revenues accounted for 24% of our total revenues for the three months ended September 30, 2013. The year-over-year increase in revenue of 13% was primarily due to positive contributions from several acquisitions resulting in increases in our turnaround services business and our field services business. This growth was tempered by a loss of a contract and softness in our lodging business. Our lodging business was impacted by the delay in completing the construction of the Ruth Lake camp due to flooding and weather issues.  

Our Oil and Gas Field Services revenues accounted for 12% of our total revenues for the three months ended September 30, 2013. The year-over-year increase of 27% was primarily due to an increase in our seismic business in Western Canada, continued expansion in the U.S., and flood and oil-spill cleanup work in the region.  

Our cost of revenues increased from $372.9 million during the three months ended September 30, 2012 to $647.1 million during the three months ended September 30, 2013.  Our cost of revenues increased primarily due to our acquisition of Safety-Kleen in December 2012.  Our gross profit margin was 28.7% for the three months ended September 30, 2013, compared to 30.1% in the same period last year. The year-over-year decrease in gross margin percentage was primarily due to the acquisition of Safety-Kleen, which carries a lower margin.

During the three months ended September 30, 2013, our effective tax rate was 34.7%, compared with 33.8% for the same period last year. The increase in the effective tax rate for the three months ended September 30, 2013 was primarily attributable to a small decline in the year-to-date rate recorded during the three months ended September 30, 2012.

Environmental Liabilities

The net decrease in our estimated environmental liabilities during the nine months ended September 30, 2013 was $1.9 million, including favorable benefits from changes in environmental liability estimates of $2.4 million. The favorable benefits over the past few years from changes in environmental liability estimates were due to the successful introduction of new technology for remedial activities, favorable results from environmental studies of the on-going remediation, including favorable regulatory approvals, and lower project costs realized by utilizing internal labor and equipment. During the nine months ended September 30, 2013, the $2.4 million favorable benefit from changes in environmental liability estimates primarily related to a reduction in remedial liabilities for one inactive site that recently received site closure approval and resulted in reevaluating and removing certain compensation costs.

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

We define Adjusted EBITDA (a measure not defined under generally accepted accounting principles) as 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 are loss on early extinguishment of debt, other income (expense) and income from discontinued operations, net of tax as these amounts are not considered part of usual business operations.  Our 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

33

generally accepted accounting principles in the United States (“GAAP”). Because Adjusted EBITDA is not calculated identically by all companies, 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 core 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 expenses such as debt extinguishment and related costs relating to transactions not reflective of our core operations. 

The information about our core 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 board of directors and discuss with the board our interpretation of such results. We also compare our Adjusted EBITDA performance against internal targets as a key factor in determining cash bonus compensation for executives and other employees, largely because we believe that this measure is indicative of how the fundamental business is performing and is being managed.

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

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

	For the Three Months Ended				For the Nine Months Ended
	September 30,				September 30,
	2013		2012		2013			2012
Net income	$	35,361	$	12,359	$	68,765		$	67,800
Accretion of environmental liabilities	2,914		2,488		8,628			7,409
Depreciation and amortization	69,430		41,300		196,904			116,794
Other expense (income)	150		91		(2,030		)	465
Loss on early extinguishment of debt	—		26,385		—			26,385
Interest expense, net	19,326		11,596		58,784			33,836
Pre-tax, non-cash acquisition accounting adjustments	—		—		13,559			—
Provision for income taxes	18,771		6,308		36,160			37,487
Adjusted EBITDA	$	145,952	$	100,527	$	380,770		$	290,176

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The following reconciles Adjusted EBITDA to cash from operations (in thousands):

	For the Nine Months Ended
	September 30,
	2013			2012
Adjusted EBITDA	$	380,770		$	290,176
Interest expense, net	(58,784		)	(33,836		)
Provision for income taxes	(36,160		)	(37,487		)
Allowance for doubtful accounts	5,281			809
Amortization of deferred financing costs and debt discount	2,539			1,173
Change in environmental liability estimates	(2,417		)	(3,553		)
Deferred income taxes	272			(494		)
Stock-based compensation	6,389			5,235
Excess tax benefit of stock-based compensation	(1,589		)	(1,786		)
Income tax benefits related to stock option exercises	1,579			1,776
Prepayment penalty on early extinguishment of debt	—			(21,044		)
Environmental expenditures	(15,928		)	(7,833		)
Changes in assets and liabilities, net of acquisitions:
Accounts receivable	(72,377		)	59,881
Inventories	1,710			(7,692		)
Other current assets	11,860			12,822
Accounts payable	37,257			(18,969		)
Other current and long-term liabilities	19,712			(6,486		)
Net cash from operating activities	$	280,114		$	232,692

Segment data

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 nine months ended September 30, 2013 and 2012 (in thousands). We consider the Adjusted EBITDA contribution from each segment to include revenue attributable to each segment less operating expenses, which include cost of revenues and selling, general and administrative expenses. Revenue attributable to each segment is generally external or direct revenue from third party customers. Certain income or expenses of a non-recurring or unusual nature are not included in the segment Adjusted EBITDA contribution. Prior year amounts presented have been recast to reflect the changes made to our segment presentation in the first quarter of 2013 as described in Note 17, "Segment Reporting." This table and subsequent discussions should be read in conjunction with Item 6, "Selected Financial Data," and Item 8, "Financial Statements and Supplementary Data," and in particular Note 18, "Segment Reporting," included in our Annual Report on Form 10-K for the year ended December 31, 2012 and Item 1, "Unaudited Financial Statements" and in particular Note 17, "Segment Reporting," in this report.

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Three months ended September 30, 2013 versus the three months ended September 30, 2012

	Summary of Operations (in thousands)
	For the Three Months Ended September 30,
	2013			2012			$ Change			% Change
Third Party Revenues:
Technical Services	$	269,465		$	247,355		$	22,110		8.9	%
Oil Re-refining and Recycling	151,565			—			151,565			—
SK Environmental Services	150,535			—			150,535			—
Industrial and Field Services	227,754			203,371			24,383			12.0
Oil and Gas Field Services	107,627			82,812			24,815			30.0
Corporate Items	589			268			321			119.8
Total	$	907,535		$	533,806		$	373,729		70.0	%
Direct Revenues:
Technical Services	$	305,835		$	254,971		$	50,864		19.9	%
Oil Re-refining and Recycling	86,647			—			86,647			—
SK Environmental Services	187,051			—			187,051			—
Industrial and Field Services	220,505			194,594			25,911			13.3
Oil and Gas Field Services	107,831			84,640			23,191			27.4
Corporate Items	(334		)	(399		)	65			(16.3	)
Total	907,535			533,806			373,729			70.0
Cost of Revenues (exclusive of items shown separately) (1):
Technical Services	204,425			169,484			34,941			20.6
Oil Re-refining and Recycling	63,282						63,282			—
SK Environmental Services	138,779			—			138,779			—
Industrial and Field Services	157,692			138,105			19,587			14.2
Oil and Gas Field Services	79,961			63,725			16,236			25.5
Corporate Items	2,980			1,626			1,354			83.3
Total	647,119			372,940			274,179			73.5
Selling, General & Administrative Expenses:
Technical Services	22,561			17,246			5,315			30.8
Oil Re-refining and Recycling	4,473			—			4,473			—
SK Environmental Services	25,321			—			25,321			—
Industrial and Field Services	14,717			13,211			1,506			11.4
Oil and Gas Field Services	7,016			6,783			233			3.4
Corporate Items	40,376			23,099			17,277			74.8
Total	114,464			60,339			54,125			89.7
Adjusted EBITDA:
Technical Services	78,849			68,241			10,608			15.5
Oil Re-refining and Recycling	18,892			—			18,892			—
SK Environmental Services	22,951			—			22,951			—
Industrial and Field Services	48,096			43,278			4,818			11.1
Oil and Gas Field Services	20,854			14,132			6,722			47.6
Corporate Items	(43,690		)	(25,124		)	(18,566		)	73.9
Total	$	145,952		$	100,527		$	45,425		45.2	%

______________________

(1) Items shown separately consist of (i) accretion of environmental liabilities and (ii) depreciation and amortization.

36

Direct Revenues

Technical Services revenues increased19.9%, or $50.9 million, in the three months ended September 30, 2013 from the comparable period in 2012 primarily due to our acquisition of Safety-Kleen delivering high utilization and volumes into our disposal network, as well as our integration of a portion of the Safety-Kleen business into our Technical Services segment. The utilization rate at our incinerators was 93.5% for the three months ended September 30, 2013, compared with 91.3% in the comparable period of 2012, and our landfill volumes increased by approximately 7% year-over-year.

The increases in Oil Re-refining and Recycling and SK Environmental Services revenues for the three months ended September 30, 2013 were due to our acquisition of Safety-Kleen in December 2012.

Industrial and Field Services revenues increased13.3%, or $25.9 million, in the three months ended September 30, 2013 from the comparable period in 2012 primarily due to positive contributions from several acquisitions resulting in increases in our turnaround services business and our field services business. This growth was tempered by a loss of a contract and softness in our lodging business. Our lodging business was impacted by the delay in completing the construction of the Ruth Lake camp due to flooding and weather issues.

Oil and Gas Field Services revenues increased27.4%, or $23.2 million, in the three months ended September 30, 2013 from the comparable period in 2012 primarily due to an increase in our seismic business in Western Canada, continued expansion in the U.S., and flood and oil-spill cleanup work.

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

Cost of Revenues

Technical Services cost of revenues increased20.6%, or $34.9 million, in the three months ended September 30, 2013 from the comparable period in 2012 primarily due to increases in salary and labor expenses ($10.4 million), materials and supplies ($8.0 million), outside transportation ($5.9 million), outside disposal and rail costs ($4.1 million), subcontractor and temporary fees ($3.3 million) and vehicle expense and equipment repair costs ($2.2 million), offset partially by a reduction in materials for reclaim ($5.2 million).  These increases relate partially to the integration of a portion of the Safety-Kleen business into the Technical Services segment.

The increases in Oil Re-refining and Recycling and SK Environmental Services cost of revenues for the three months ended September 30, 2013 were due to our acquisition of Safety-Kleen in December 2012.

Industrial and Field Services cost of revenues increased14.2%, or $19.6 million, in the three months ended September 30, 2013 from the comparable period in 2012 primarily due to increased salary and labor cost and materials and supplies costs associated with our acquisitions during 2012.  

Oil and Gas Field Services cost of revenues increased25.5%, or $16.2 million, in the three months ended September 30, 2013 from the comparable period in 2012 primarily due to increases in salary and labor costs, subcontractor costs and materials and supplies costs related to the flood cleanup work in Western Canada and the large seismic project work and cleanup work in North Western Canada.

 We believe that our ability to manage operating costs is important in 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, continued modifications and upgrades at our facilities and implementation of strategic sourcing initiatives. We plan to continue to focus on achieving cost savings relating to purchased goods and services through a strategic sourcing initiative. No assurance can be given that our efforts to reduce future operating expenses will be successful. 

Selling, General and Administrative Expenses

Technical Services selling, general and administrative expenses increased30.8%, or $5.3 million, in the three months ended September 30, 2013 from the comparable period in 2012 primarily due to year-over-year changes in environmental liabilities estimates and increased compensation costs.

The increases in Oil Re-refining and Recycling and SK Environmental Services selling, general and administrative expenses for the three months ended September 30, 2013 were due to our acquisition of Safety-Kleen in December 2012.

Industrial and Field Services selling, general and administrative expenses increased11.4%, or $1.5 million, in the three months ended September 30, 2013 from the comparable period in 2012 primarily due to increased compensation costs. 

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Oil and Gas Field Services selling, general and administrative expenses increased3.4%, or $0.2 million, for the three months ended September 30, 2013, from the comparable period in 2012. The increase was primarily due to increased compensation costs. 

Corporate Items selling, general and administrative expenses increased74.8%, or $17.3 million, for the three months ended September 30, 2013, as compared to the same period in 2012 primarily due to our acquisition of Safety-Kleen in December 2012 resulting in increases in compensation costs, computer expenses, travel costs, professional fees and rent expense. We also incurred a year-over-year increase in severance costs of $0.8 million, and an increase in professional fees related to acquisitions of $0.9 million. These increases were partially offset by a net reduction in year-over-year changes in environmental liability estimates.

Depreciation and Amortization

	For the Three Months Ended
	September 30,
	2013		2012
Depreciation of fixed assets	$	54,995	$	31,636
Landfill and other amortization	14,435		9,664
Total depreciation and amortization	$	69,430	$	41,300

Depreciation and amortization increased68.1%, or $28.1 million, in the third quarter of 2013 compared to the same period in 2012. Depreciation of fixed assets increased primarily due to acquisitions and other increased capital expenditures in recent periods. Landfill and other amortization increased primarily due to the increase in other intangibles resulting from recent acquisitions.

Interest Expense, Net

	For the Three Months Ended
	September 30,
	2013			2012
Interest expense	$	19,422		$	11,817
Interest income	(96		)	(221		)
Interest expense, net	$	19,326		$	11,596

Interest expense, net increased$7.7 million in the third quarter of 2013 compared to the same period in 2012. The increase in interest expense was primarily due to the issuance of $800.0 million of 5.25% senior unsecured notes in July 2012 and $600.0 million of 5.125% senior unsecured notes in December 2012, which was partially offset by our redemption and repurchase during the third quarter of 2012 of $520.0 million of previously outstanding 7.625% senior secured notes. The transactions resulted in an additional principal amount of notes outstanding during 2012 than for the comparable prior period, but at a more favorable interest rate.

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Nine months ended September 30, 2013 versus the nine months ended September 30, 2012

	Summary of Operations (in thousands)
	For the Nine Months Ended September 30,
	2013			2012			$ Change			% Change
Third Party Revenues:
Technical Services	$	759,666		$	712,313		$	47,353		6.6	%
Oil Re-refining and Recycling	438,191			—			438,191			—
SK Environmental Services	453,325			—			453,325			—
Industrial and Field Services	693,667			608,768			84,899			13.9
Oil and Gas Field Services	294,183			306,566			(12,383		)	(4.0	)
Corporate Items (1)	(8,806		)	1,299			(10,105		)	(777.9	)
Total	$	2,630,226		$	1,628,946		$	1,001,280		61.5	%
Direct Revenues:
Technical Services	$	848,435		$	738,353		$	110,082		14.9	%
Oil Re-refining and Recycling	252,138			—			252,138			—
SK Environmental Services	579,850			—			579,850			—
Industrial and Field Services	661,535			577,570			83,965			14.5
Oil and Gas Field Services	300,183			313,186			(13,003		)	(4.2	)
Corporate Items (1)	(11,915		)	(163		)	(11,752		)	7,209.8
Total	2,630,226			1,628,946			1,001,280			61.5
Cost of Revenues (exclusive of items shown separately) (2):
Technical Services	575,190			489,602			85,588			17.5
Oil Re-refining and Recycling	189,870			—			189,870			—
SK Environmental Services	415,467			—			415,467			—
Industrial and Field Services	476,816			417,012			59,804			14.3
Oil and Gas Field Services	226,073			227,648			(1,575		)	(0.7	)
Corporate Items (1)	14,053			6,616			7,437			112.4
Total	1,897,469			1,140,878			756,591			66.3
Selling, General & Administrative Expenses:
Technical Services	64,961			60,078			4,883			8.1
Oil Re-refining and Recycling	15,407			—			15,407			—
SK Environmental Services	80,221			—			80,221			—
Industrial and Field Services	46,081			42,644			3,437			8.1
Oil and Gas Field Services	21,738			23,239			(1,501		)	(6.5	)
Corporate Items	137,138			71,931			65,207			90.7
Total	365,546			197,892			167,654			84.7
Adjusted EBITDA:
Technical Services	208,284			188,673			19,611			10.4
Oil Re-refining and Recycling	46,861			—			46,861			—
SK Environmental Services	84,162			—			84,162			—
Industrial and Field Services	138,638			117,914			20,724			17.6
Oil and Gas Field Services	52,372			62,299			(9,927		)	(15.9	)
Corporate Items	(149,547		)	(78,710		)	(70,837		)	90.0
Total	$	380,770		$	290,176		$	90,594		31.2	%

_______________________

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(1) Corporate Items revenues and costs of revenues for the nine months ended September 30, 2013 include one-time, non-cash reductions and increases of approximately $10.2 million and $3.4 million, respectively, due to the impact of fair value acquisition accounting adjustments on Safety-Kleen's historical deferred revenue, inventory and deferred cost balances at December 28, 2012.

(2) Items shown separately consist of (i) accretion of environmental liabilities and (ii) depreciation and amortization.

Direct Revenues

Technical Services revenues increased14.9%, or $110.1 million, in the nine months ended September 30, 2013 from the comparable period in 2012 primarily due to growth in our TSDF network due to higher drum volumes, an increase in our wastewater treatment volumes, contributions from our remediation projects business, and an increase due to the integration of a portion of the Safety-Kleen business into our Technical Services segment. The utilization rate at our incinerators was 91.6% for the nine months ended September 30, 2013, compared with 90.4% in the comparable period of 2012, and our landfill volumes increased by approximately 6% year-over-year.

The increases in Oil Re-refining and Recycling and SK Environmental Services revenues for the nine months ended September 30, 2013 were due to our acquisition of Safety-Kleen in December 2012.

Industrial and Field Services revenues increased14.5%, or $84.0 million, in the nine months ended September 30, 2013 from the comparable period in 2012 primarily due to positive contributions from several acquisitions resulting in increases in our turnaround services business and our field services business.

Oil and Gas Field Services revenues decreased4.2%, or $13.0 million, in the nine months ended September 30, 2013 from the comparable period in 2012 primarily due to the lower rig count in Western Canada that resulted in a reduction in surface rental activity and decreased seismic activities.

Corporate Items revenues decreased$11.8 million, in the nine months ended September 30, 2013 from the comparable period in 2012 primarily due to inclusion of the impact of the fair value acquisition accounting adjustment on Safety-Kleen's historical deferred revenue balance at December 28, 2012 ($10.2 million).

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

Cost of Revenues

Technical Services cost of revenues increased17.5%, or $85.6 million, in the nine months ended September 30, 2013 from the comparable period in 2012 primarily due to increases in salary and labor expenses ($29.9 million), outside transportation ($16.6 million), materials and supplies ($13.6 million), outside disposal and rail costs ($10.0 million), subcontractor and temporary fees ($7.1 million), vehicle expenses and equipment repair costs ($6.5 million), and utilities costs ($5.1 million), offset partially by a reduction in materials for reclaim ($21.4 million).  These increases relate partially to the integration of a portion of the Safety-Kleen business into the Technical Services segment.

The increases in Oil Re-refining and Recycling and SK Environmental Services cost of revenues for the nine months ended September 30, 2013 were due to our acquisition of Safety-Kleen in December 2012.

Industrial and Field Services cost of revenues increased14.3%, or $59.8 million, in the nine months ended September 30, 2013 from the comparable period in 2012 primarily due to increased salary, labor and travel expenses associated with acquisitions during 2012.  

Oil and Gas Field Services cost of revenues decreased0.7%, or $1.6 million, in the nine months ended September 30, 2013 from the comparable period in 2012 primarily related to reductions in surface rentals and seismic activities resulting in a reduction in lease operator costs offset partially by increases in vehicle expense costs and salary and labor costs.

Corporate Items cost of revenues increased$7.4 million, in the nine months ended September 30, 2013 from the comparable period in 2012 primarily due to the impact of the acquisition accounting adjustments on Safety-Kleen's historical inventory and deferred cost balances at December 28, 2012 ($3.4 million) as well as an increase in general insurance costs.

 We believe that our ability to manage operating costs is important in 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, continued modifications and upgrades at our facilities and implementation of strategic sourcing initiatives. We plan to continue to focus on achieving cost savings relating to purchased goods and services through a strategic sourcing initiative. No assurance can be given that our efforts to reduce future operating expenses will be successful. 

40

Selling, General and Administrative Expenses

Technical Services selling, general and administrative expenses increased8.1%, or $4.9 million, in the nine months ended September 30, 2013 from the comparable period in 2012 primarily due to year-over-year changes in environmental liabilities estimates and increased compensation costs.

The increases in Oil Re-refining and Recycling and SK Environmental Services selling, general and administrative expenses for the nine months ended September 30, 2013 were due to our acquisition of Safety-Kleen in December 2012.

Industrial and Field Services selling, general and administrative expenses increased8.1%, or $3.4 million, in the nine months ended September 30, 2013 from the comparable period in 2012 primarily due to increased compensation costs. 

Oil and Gas Field Services selling, general and administrative expenses decreased6.5%, or $1.5 million, for the nine months ended September 30, 2013, from the comparable period in 2012. The decrease was primarily due to decreases in compensation costs. 

Corporate Items selling, general and administrative expenses increased90.7%, or $65.2 million, for the nine months ended September 30, 2013, as compared to the same period in 2012 primarily due to our acquisition of Safety-Kleen in December 2012 resulting in increases in compensation costs, computer expenses, professional fees and rent expense. We also incurred a year-over-year increase in severance costs of $6.3 million and an increase in professional fees related to acquisitions of $6.2 million.

Depreciation and Amortization

	For the Nine Months Ended
	September 30,
	2013		2012
Depreciation of fixed assets	$	157,900	$	92,346
Landfill and other amortization	39,004		24,448
Total depreciation and amortization	$	196,904	$	116,794

Depreciation and amortization increased68.6%, or $80.1 million, in the first nine months of 2013 compared to the same period in 2012. Depreciation of fixed assets increased primarily due to acquisitions and other increased capital expenditures in recent periods. Landfill and other amortization increased primarily due to the increase in other intangibles resulting from recent acquisitions.

Interest Expense, Net

	For the Nine Months Ended
	September 30,
	2013			2012
Interest expense	$	59,146		$	34,459
Interest income	(362		)	(623		)
Interest expense, net	$	58,784		$	33,836

Interest expense, net increased$24.9 million in the first nine months of 2013 compared to the same period in 2012. The increase in interest expense was primarily due to the issuance of $800.0 million of 5.25% senior unsecured notes in July 2012 and $600.0 million of 5.125% senior unsecured notes in December 2012, which was partially offset by our redemption and repurchase during the third quarter of 2012 of $520.0 million of previously outstanding 7.625% senior secured notes. The transactions resulted in an additional principal amount of notes outstanding during 2012 than for the comparable prior period, but at a more favorable interest rate.

Income Taxes

Our effective tax rate for the three and nine months ended September 30, 2013 was 34.7% and 34.5%, respectively, compared to 33.8% and 35.6% for the same periods in 2012.  The increase in the effective tax rate for the three months ended September 30, 2013 was primarily attributable to a small decline in the year-to-date rate recorded during the three months ended September 30, 2012. The decrease in the effective tax rate for the nine months ended September 30, 2013 was primarily attributable to lower accrued interest and penalties related to unrecognized tax benefits in 2013 as compared to the same period for 2012.

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Income tax expense for the three months ended September 30, 2013increased$12.5 million to $18.8 million from $6.3 million for the comparable period in 2012. Income tax expense for the nine months ended September 30, 2013decreased$1.3 million to $36.2 million from $37.5 million for the comparable period in 2012. The increased tax expense for the three months ended September 30, 2013 was primarily attributable to higher income before taxes in 2013 as compared to the same period for 2012 which included the $26.4 million loss on early extinguishment of debt. The decreased tax expense for the nine months ended September 30, 2013 was primarily attributable to the lower accrued interest and penalties related to unrecognized tax benefits in 2013 as compared to the same period in 2012.

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 September 30, 2013 and December 31, 2012, we had a remaining valuation allowance of $25.6 million. The allowance as of September 30, 2013 and December 31, 2012 consisted of $17.6 million of foreign tax credits, $1.4 million of state net operating loss carryforwards and $6.6 million of foreign net operating loss carryforwards.  

Our accounting policy is to recognize interest and penalties related to income tax matters as a component of income tax expense. The liability for unrecognized tax benefits and related reserves as of September 30, 2013 and December 31, 2012, included accrued interest of $1.6 million and $1.4 million, respectively.  Tax expense for the three and nine months ended September 30, 2013 included interest of $0.1 million and $0.2 million, respectively. Tax expense for the three and nine months ended September 30, 2012 included interest of $0.7 million and $1.4 million, respectively.

Liquidity and Capital Resources

Cash and Cash Equivalents

During the nine months ended September 30, 2013, cash and cash equivalents increased$18.8 million.

We intend to use our existing cash and cash equivalents, marketable securities and cash flow from operations to provide for our working capital needs, to fund capital expenditures and for potential acquisitions. We anticipate that our cash flow provided by operating activities will provide the necessary funds on a short- and long-term basis to meet operating cash requirements.  

At September 30, 2013, cash and cash equivalents totaled $248.6 million, compared to $229.8 million at December 31, 2012. At September 30, 2013, cash and cash equivalents held by foreign subsidiaries totaled $59.7 million and were readily convertible into other foreign currencies including U.S. dollars. At September 30, 2013, the cash and cash equivalent balances for our U.S. operations were $188.9 million. Our U.S. operations had net operating cash from operations of $138.6 million for the nine months ended September 30, 2013. Additionally, we have available a $400.0 million revolving credit facility of which $262.3 million was available to borrow at September 30, 2013. 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 had accrued environmental liabilities as of September 30, 2013 of approximately $219.6 million, substantially all of which we assumed in connection with our acquisition of the CSD assets in September 2002, Teris LLC in 2006, one of the two solvent recycling facilities we purchased from Safety-Kleen Systems, Inc. in 2008, the remaining Safety-Kleen facilities acquired as part of our acquisition of Safety-Kleen in 2012 and our acquisition of Evergreen in September 2013. We anticipate our environmental liabilities 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. 

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. Furthermore, the existing cash balances and the availability of additional borrowings under our revolving credit facility provide additional potential sources of liquidity should they be required.

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Cash Flows for the nine months ended September 30, 2013

Cash from operating activities in the first nine months of 2013 was $280.1 million, an increase of 20.4%, or $47.4 million, compared with cash from operating activities in the first nine months of 2012. The change was primarily the result of a net decrease in net working capital items.

Cash used for investing activities in the first nine months of 2013 was $267.8 million, an increase of 18.3%, or $41.4 million, compared with cash used for investing activities in the first nine months of 2012.  This increase was due primarily to an increase in capital expenditures of $77.3 million partially offset by a decrease in acquisitions (net of cash acquired) of $33.0 million.  

Cash generated by financing activities in the first nine months of 2013 was $9.7 million, compared with cash generated for financing activities of $256.1 million in the first nine months of 2012. The change was primarily the result of the issuance of $800.0 million aggregate principal amount of 5.25% senior unsecured notes and the $520.0 million redemption and repurchase of the 7.625% senior secured notes during the third quarter of 2012.  

Cash Flows for the nine months ended September 30, 2012

     Cash from operating activities in the first nine months of 2012 was $232.7 million, an increase of 53.8%, or $81.4 million, compared with cash from operating activities in the first nine months of 2011. The change was primarily the result of increased depreciation and amortization primarily due to acquisition and other increased capital expenditures in recent periods and a net increase in working capital items.

Cash used for investing activities in the first nine months of 2012 was $226.4 million, a decrease of 49.2% or $219.2 million, compared with cash used for investing activities in the first nine months of 2011.  The change was due primarily from lower year-over-year costs associated with acquisitions offset partially by increases in additions to property, plant and equipment. 

Cash used for financing activities in the first nine months of 2012 was $256.1 million, compared with cash from financing activities of $247.9 million in the first nine months of 2011. The change was primarily the result of the issuance of $800.0 million aggregate principal amount of 5.25% senior unsecured notes and the $520.0 million redemption and repurchase of 7.625% senior secured notes during the third quarter of 2012.

Financing Arrangements

The financing arrangements and principal terms of our $800.0 million principal amount of 5.25% senior unsecured notes due 2020 and $600.0 million principal amount of 5.125% senior unsecured notes due 2021 which were outstanding at September 30, 2013, and our amended $400.0 million revolving credit facility, are discussed further in Note 11, “Financing Arrangements,” in our Annual Report on Form 10-K for the year ended December 31, 2012.

 As of September 30, 2013, we were in compliance with the covenants of our debt agreements, and we believe it is reasonably likely that we will continue to meet such covenants. 

Liquidity Impacts of Uncertain Tax Positions

As discussed in Note 12, “Income Taxes,” to our financial statements included in Item 1 of this report, we have recorded as of September 30, 2013, $3.9 million of unrecognized tax benefits and related reserves and $1.6 million of potential interest. These liabilities are classified as “deferred taxes, unrecognized tax benefits and other long-term liabilities” in our consolidated balance sheets. We are not able to reasonably estimate when we would make any cash payments to settle these liabilities. However, we believe no material cash payments will be required in the next 12 months.

Auction Rate Securities

As of September 30, 2013, our long-term investments included $4.4 million of available for sale auction rate securities. With the liquidity issues experienced in global credit and capital markets, these auction rate securities have experienced multiple failed auctions and as a result are currently not liquid. The auction rate securities are secured by student loans substantially insured by the Federal Family Education Loan Program, maintain the highest credit rating of AAA, and continue to pay interest according to their stated terms with interest rates resetting generally every 28 days. 

We believe we have sufficient liquidity to fund operations and do not plan to sell our auction rate securities in the foreseeable future at an amount below the original purchase value.  In the unlikely event that we need to access the funds that are in an illiquid state, we may not be able to do so without a possible loss of principal until a future auction for these investments is successful, another secondary market evolves for these securities, they are redeemed by the issuer, or they mature. If we were unable to sell these securities in the market or they are not redeemed, we could be required to hold them to maturity. These securities are currently reflected at their fair value utilizing a discounted cash flow analysis or significant other observable inputs.

43

As of September 30, 2013, we have recorded an unrealized pre-tax loss of $0.3 million, which we assess as temporary. We will continue to monitor and evaluate these investments on an ongoing basis for other than temporary impairment and record an adjustment to earnings if and when appropriate.

ITEM 3.QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

In the normal course of business, we are exposed to market risks, including changes in interest rates, certain commodity prices, and certain foreign currency rates, primarily the Canadian dollar. Our philosophy in managing interest rate risk is to borrow at fixed rates for longer time horizons to finance non-current assets and to borrow (to the extent, if any, required) at variable rates for working capital and other short-term needs. We therefore have not entered into derivative or hedging transactions (other than with respect to commodity derivatives), nor have we entered into transactions to finance off-balance sheet debt. The following table provides information regarding our fixed rate borrowings at September 30, 2013 (in thousands): 

	Three Months Remaining
Scheduled Maturity Dates	2013			2014			2015			2016		2017		Thereafter			Total
Senior unsecured notes due 2020	$	—		$	—		$	—		$	—	$	—	$	800,000		$	800,000
Senior unsecured notes due 2021	—			—			—			—		—		600,000			600,000
Capital lease obligations	1,035			2,261			346			—		—		—			3,642
	$	1,035		$	2,261		$	346		$	—	$	—	$	1,400,000		$	1,403,642
Weighted average interest rate on fixed rate borrowings	5.2		%	5.2		%	5.2		%					5.2		%

In addition to the fixed rate borrowings described in the above table, we had at September 30, 2013 variable rate instruments that included a revolving credit facility (as amended and restated on January 17, 2013) with maximum borrowings of up to $400.0 million (with a $325.0 million sub-limit for letters of credit). Commencing in 2013, we began remitting interest payments in the amount of $21.0 million each related to the $800.0 million senior unsecured notes payable semi-annually on February 1 and August 1 of each year, and began remitting interest payments in the amount of $15.4 million each related to the $600.0 million senior unsecured notes payable semi-annually on June 1 and December 1 of each year. 

We view our investment in our foreign subsidiaries as long-term; thus, we have not entered into any hedging transactions between any two foreign currencies or between any of the foreign currencies and the U.S. dollar. During 2013, the Canadian subsidiaries transacted approximately 6.4% of their business in U.S. dollars and at any period end have cash on deposit in U.S. dollars and outstanding U.S. dollar accounts receivable related to these transactions. These cash and receivable accounts are vulnerable to foreign currency translation gains or losses. Exchange rate movements also affect the translation of Canadian generated profits and losses into U.S. dollars. Had the Canadian dollar been 10.0% stronger or weaker against the U.S. dollar, we would have reported increased or decreased net income of $0.1 millionand $1.0 million for the three months ended September 30, 2013 and 2012, respectively.  Had the Canadian dollar been 10.0% stronger or weaker against the U.S. dollar, we would have reported increased or decreased net income of $1.4 million and $2.3 million for the nine months ended September 30, 2013 and 2012, respectively. 

At September 30, 2013, $4.4 million of our noncurrent investments were auction rate securities. While we are uncertain as to when the liquidity issues relating to these investments will improve, we believe these issues will not materially impact our ability to fund our working capital needs, capital expenditures, or other business requirements. 

In connection with the operations of our Technical Services, SK Environmental Services, Industrial and Field Services and Oil and Gas Field Services segments, we are subject to minimal market risk arising from purchases of commodities since no significant amount of commodities are used in the treatment of hazardous waste or providing energy and industrial services. In connection with the operations of our Oil Re-refining and Recycling segment, which we acquired in December 2012 as part of our acquisition of Safety-Kleen, we are exposed to market risk from changes in certain oil and oil derivative commodity prices and indices, specifically the ICIS-LOR rate and 6-oil index. Safety-Kleen entered into several commodity derivatives during 2012 and 2013 which are comprised of cashless collar contracts related to crude oil prices. Pursuant to each such contract, Safety-Kleen sold a call option to a bank and then purchased a put option from the same bank in order to manage against significant fluctuations in crude oil prices, which are closely correlated with the ICIS-LOR rate and the 6-oil index. These commodity derivatives are designed to mitigate, although not eliminate, our exposure to declines in these oil indices below a price floor, but they also will limit our potential upside related to increases in these oil indices above a price cap. We do not believe that our exposure will be material. These commodity derivatives are not classified as hedges and expire at various intervals in 2013 and 2014. For additional information, see Note 4, "Fair Value Measurements," in this report and Note 2, “Significant Accounting

44

Policies - Derivative Financial Instruments,” to our consolidated financial statements included in Item 8, “Financial Statements and Supplementary Data,” in our Annual Report on Form 10-K for the year ended December 31, 2012.

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 September 30, 2013 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

On December 28, 2012, the Company acquired Safety-Kleen (see Note 3, "Business Combinations,” to the financial statements included in Item 1 of this report). The Company has extended its Section 404 compliance program under the Sarbanes-Oxley Act of 2002 and the applicable rules and regulations under such Act to include Safety-Kleen. The Company will report on its assessment of the effectiveness of internal control over financial reporting for the combined operations at December 31, 2013.

On September 13, 2013, the Company acquired Evergreen (see Note 3, "Business Combinations,” to the financial statements included in Item 1 of this report). The Company has extended its Section 404 compliance program under the Sarbanes-Oxley Act of 2002 and the applicable rules and regulations under such Act to include Evergreen. The Company will report on its assessment of the effectiveness of internal control over financial reporting for the combined operations at December 31, 2013.

Other than as described above, 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 September 30, 2013 that have materially affected, or are reasonably likely to materially affect, the Company’s internal control over financial reporting.

45

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 three months ended September 30, 2013, 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, 2012. 

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 September 30, 2013, formatted in XBRL: (i) Consolidated Balance Sheets, (ii) Unaudited Consolidated Statements of Income, (iii) Unaudited Consolidated Statements of Comprehensive Income, (iv) Unaudited Consolidated Statements of Cash Flows, (v) Unaudited Consolidated Statements of Stockholders’ Equity, and (vi) Notes to Unaudited Consolidated Financial Statements.	*

_______________________

* These 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.

46

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:	November 7, 2013
		By:	/s/  JAMES M. RUTLEDGE
			James M. Rutledge
			Vice Chairman, President and Chief Financial Officer
Date:	November 7, 2013

47

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: November 7, 2013

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: November 7, 2013

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 September 30, 2013 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:	November 7, 2013
		By:	/s/  JAMES M. RUTLEDGE
			James M. Rutledge
			Vice Chairman, President and Chief Financial Officer
Date:	November 7, 2013

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ACCRUED EXPENSES

9 Months Ended

Sep. 30, 2013

Accrued Expenses [ABSTRACT]

ACCRUED EXPENSES

ACCRUED EXPENSES

Accrued expenses consisted of the following (in thousands):

	September 30, 2013		December 31, 2012
Insurance	$	54,105	$	48,243
Interest	17,900		20,061
Accrued disposal costs	1,498		1,835
Accrued compensation and benefits	71,030		70,250
Income, real estate, sales and other taxes	54,403		35,640
Other	57,877		56,400
Total accrued expenses	$	256,813	$	232,429

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GOODWILL AND OTHER INTANGIBLE ASSETS (Rollforward of Goodwill) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
Goodwill [Roll Forward]
Balance at January 1, 2013	$ 593,771
Acquired from acquisitions	3,179
Decrease from adjustments during the measurement period related to acquisitions	(2,009)
Foreign currency translation	(4,789)
Balance at September 30, 2013	$ 590,152

XML

UNAUDITED CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenues:
Service revenues	$ 702,033	$ 503,728	$ 2,048,527	$ 1,523,767
Product revenues	205,502	30,078	581,699	105,179
Total revenues	907,535	533,806	2,630,226	1,628,946
Cost of revenues (exclusive of items shown separately below)
Service revenues	478,434	348,758	1,402,409	1,056,174
Product revenues	168,685	24,182	495,060	84,704
Total cost of revenues	647,119	372,940	1,897,469	1,140,878
Selling, general and administrative expenses	114,464	60,339	365,546	197,892
Accretion of environmental liabilities	2,914	2,488	8,628	7,409
Depreciation and amortization	69,430	41,300	196,904	116,794
Income from operations	73,608	56,739	161,679	165,973
Other (expense) income	(150)	(91)	2,030	(465)
Loss on early extinguishment of debt	0	(26,385)	0	(26,385)
Interest expense, net of interest income of $96 and $362 for the quarter and year-to-date ended 2013 and $221 and $623 for the quarter and year-to-date ended 2012, respectively	(19,326)	(11,596)	(58,784)	(33,836)
Income before provision for income taxes	54,132	18,667	104,925	105,287
Provision for income taxes	18,771	6,308	36,160	37,487
Net income	$ 35,361	$ 12,359	$ 68,765	$ 67,800
Earnings per share:
Basic (in USD per share)	$ 0.58	$ 0.23	$ 1.14	$ 1.27
Diluted (in USD per share)	$ 0.58	$ 0.23	$ 1.13	$ 1.27
Weighted average common shares outstanding - basic (in shares)	60,610	53,374	60,542	53,303
Weighted average common shares outstanding - diluted (in shares)	60,760	53,565	60,692	53,519

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BASIS OF PRESENTATION

9 Months Ended

Sep. 30, 2013

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. 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, 2012.

During the first quarter of 2013, the Company adjusted its operating segments to integrate the business activities of Safety-Kleen, Inc. and its subsidiaries (collectively, “Safety-Kleen”) acquired in December 2012, and to incorporate other changes made in 2013 to the manner in which the Company manages its business, makes operating decisions and assesses its performance. Under the new structure, the Company's operations are managed in five reportable segments: Technical Services, Oil Re-refining and Recycling, SK Environmental Services, Industrial and Field 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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STOCK-BASED COMPENSATION

9 Months Ended

Sep. 30, 2013

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

STOCK-BASED COMPENSATION

STOCK-BASED COMPENSATION

The following table summarizes the total number and type of awards granted during the three and nine months ended September 30, 2013, as well as the related weighted-average grant-date fair values:

	Three Months Ended			Nine Months Ended
	September 30, 2013			September 30, 2013
	Shares	Weighted Average Grant-Date Fair Value		Shares	Weighted Average Grant-Date Fair Value
Restricted stock awards	27,890	$	57.88	287,882	$	55.21
Performance stock awards	1,468	$	55.29	114,453	$	54.27
Total awards	29,358			402,335

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GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION (Condensed Consolidating Balance Sheets) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2011
ASSETS
Cash and cash equivalents	$ 248,635	$ 229,836	$ 523,614	$ 260,723
Intercompany receivables	0	0
Other current assets	893,139	856,957
Property, plant and equipment, net	1,615,427	1,531,763
Investments in subsidiaries	0	0
Intercompany debt receivable	0	0
Other long-term assets	1,199,651	1,207,250
Total assets	3,956,852	3,825,806
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities	669,532	569,052
Intercompany payables	0	0
Closure, post-closure and remedial liabilities, net	191,848	197,347
Long-term obligations	1,400,000	1,400,000
Capital lease obligations, net	1,669	2,879
Intercompany debt payable	0	0
Other long-term liabilities	217,683	224,456
Total liabilities	2,480,732	2,393,734
Stockholders' equity	1,476,120	1,432,072
Total liabilities and stockholders’ equity	3,956,852	3,825,806
Clean Harbors, Inc.
ASSETS
Cash and cash equivalents	1,006	35,214	327,020	91,581
Intercompany receivables	336,356	296,023
Other current assets	12,144	38,295
Property, plant and equipment, net	0	0
Investments in subsidiaries	2,601,246	2,528,699
Intercompany debt receivable	0	0
Other long-term assets	20,842	21,141
Total assets	2,971,594	2,919,372
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities	40,600	32,586
Intercompany payables	0	0
Closure, post-closure and remedial liabilities, net	0	0
Long-term obligations	1,400,000	1,400,000
Capital lease obligations, net	0	0
Intercompany debt payable	3,701	3,701
Other long-term liabilities	51,173	51,013
Total liabilities	1,495,474	1,487,300
Stockholders' equity	1,476,120	1,432,072
Total liabilities and stockholders’ equity	2,971,594	2,919,372
U.S. Guarantor Subsidiaries
ASSETS
Cash and cash equivalents	187,926	140,683	114,602	128,071
Intercompany receivables	2,369	17,704
Other current assets	589,065	526,354
Property, plant and equipment, net	942,331	886,032
Investments in subsidiaries	929,111	850,011
Intercompany debt receivable	508,524	508,067
Other long-term assets	900,617	896,991
Total assets	4,059,943	3,825,842
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities	472,178	402,990
Intercompany payables	510,906	412,594
Closure, post-closure and remedial liabilities, net	158,366	161,175
Long-term obligations	0	0
Capital lease obligations, net	231	301
Intercompany debt payable	0	0
Other long-term liabilities	124,441	134,393
Total liabilities	1,266,122	1,111,453
Stockholders' equity	2,793,821	2,714,389
Total liabilities and stockholders’ equity	4,059,943	3,825,842
Foreign Non-Guarantor Subsidiaries
ASSETS
Cash and cash equivalents	59,703	53,939	81,992	41,071
Intercompany receivables	174,609	116,571
Other current assets	291,930	292,308
Property, plant and equipment, net	673,096	645,731
Investments in subsidiaries	144,953	144,953
Intercompany debt receivable	3,701	3,701
Other long-term assets	278,192	289,118
Total assets	1,626,184	1,546,321
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities	156,754	133,476
Intercompany payables	2,428	17,704
Closure, post-closure and remedial liabilities, net	33,482	36,172
Long-term obligations	0	0
Capital lease obligations, net	1,438	2,578
Intercompany debt payable	508,524	508,067
Other long-term liabilities	42,069	39,050
Total liabilities	744,695	737,047
Stockholders' equity	881,489	809,274
Total liabilities and stockholders’ equity	1,626,184	1,546,321
Consolidating Adjustments
ASSETS
Cash and cash equivalents	0	0
Intercompany receivables	(513,334)	(430,298)
Other current assets	0	0
Property, plant and equipment, net	0	0
Investments in subsidiaries	(3,675,310)	(3,523,663)
Intercompany debt receivable	(512,225)	(511,768)
Other long-term assets	0	0
Total assets	(4,700,869)	(4,465,729)
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities	0	0
Intercompany payables	(513,334)	(430,298)
Closure, post-closure and remedial liabilities, net	0	0
Long-term obligations	0	0
Capital lease obligations, net	0	0
Intercompany debt payable	(512,225)	(511,768)
Other long-term liabilities	0	0
Total liabilities	(1,025,559)	(942,066)
Stockholders' equity	(3,675,310)	(3,523,663)
Total liabilities and stockholders’ equity	$ (4,700,869)	$ (4,465,729)

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ACCRUED EXPENSES (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Accrued Expenses [ABSTRACT]
Insurance	$ 54,105	$ 48,243
Interest	17,900	20,061
Accrued disposal costs	1,498	1,835
Accrued compensation and benefits	71,030	70,250
Income, real estate, sales and other taxes	54,403	35,640
Other	57,877	56,400
Total accrued expenses	$ 256,813	$ 232,429

XML

CLOSURE AND POST-CLOSURE LIABILITIES

9 Months Ended

Sep. 30, 2013

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 nine months ended September 30, 2013 were as follows (in thousands):

	Landfill Retirement Liability			Non-Landfill Retirement Liability			Total
Balance at January 1, 2013	$	26,658		$	27,590		$	54,248
Liabilities assumed in acquisitions	—			659			659
Adjustments during the measurement period related to acquisitions	—			(10,201		)	(10,201		)
New asset retirement obligations	3,321			—			3,321
Accretion	2,255			1,281			3,536
Changes in estimates recorded to statement of income	(398		)	99			(299		)
Changes in estimates recorded to balance sheet	299			—			299
Expenditures	(3,527		)	(310		)	(3,837		)
Currency translation and other	(152		)	(80		)	(232		)
Balance at September 30, 2013	$	28,456		$	19,038		$	47,494

All of the landfill facilities included in the above were active as of September 30, 2013. New asset retirement obligations incurred during the first nine months of 2013 were discounted at the credit-adjusted risk-free rate of 6.60%. There were no significant charges (benefits) in 2013 resulting from changes in estimates for closure and post-closure liabilities.

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BUSINESS COMBINATIONS (Other 2012 Acquisitions) (Details) (Other 2012 Acquisitions [Member], USD $)	3 Months Ended	9 Months Ended			12 Months Ended
	Sep. 30, 2012	Sep. 30, 2013		Sep. 30, 2012	Dec. 31, 2012
Business Acquisition [Line Items]
Combined purchase price					$ 108,900,000
Assumption of long-term debt					7,700,000
Post-closing adjustment to purchase price					(2,100,000)
Purchase Price Allocation
Current assets					20,387,000	[1]
Property, plant and equipment					51,893,000
Customer relationships and other intangibles					21,769,000
Other assets					57,000
Current liabilities					(5,299,000)
Deferred taxes, unrecognized tax benefits and other long-term liabilities					(5,212,000)
Total identifiable net assets					83,595,000
Goodwill					25,264,000	[2]
Total					108,859,000
Other current assets, Measurement Period Adjustment		117,000	[1]
Property, plant and equipment, Measurement Period Adjustment		(8,000)
Permits and other intangibles, Measurement Period Adjustment		(1,000)
Other assets, Measurement Period Adjustment		4,000
Current liabilities, Measurement Period Adjustment		(22,000)
Other liabilities, Measurement Period Adjustments		(79,000)
Total identiiable net assets, Measurement Period Adjustments		11,000
Goodwill, Measurement Period Adjustments		1,308,000	[2]
Total, Measurement Period Adjustments		1,319,000
Preliminary fair value of customer receivables					13,200,000
Gross amounts of customer receivables					13,500,000
Business Acquisition, Pro Forma Information [Abstract]
Pro forma combined revenues	545,393,000			1,698,246,000
Pro forma combined net income	11,982,000			72,351,000
Acquisition-related costs		200,000
Scenario, Previously Reported [Member]
Purchase Price Allocation
Current assets					20,270,000	[1]
Property, plant and equipment					51,901,000
Customer relationships and other intangibles					21,770,000
Other assets					53,000
Current liabilities					(5,277,000)
Deferred taxes, unrecognized tax benefits and other long-term liabilities					(5,133,000)
Total identifiable net assets					83,584,000
Goodwill					23,956,000	[2]
Total					$ 107,540,000

[1] The fair value of the financial assets acquired included customer receivables with an aggregate fair value of $13.2 million. Combined gross amounts due were $13.5 million.

[2] Goodwill represents the excess of the fair value of the net assets acquired over the purchase price attributed to expected operating and cross selling synergies. The goodwill has been assigned to the Industrial and Field Services segment and will not be deductible for tax purposes.

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CLOSURE AND POST-CLOSURE LIABILITIES (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
Changes to post-closure liabilities
Balance at January 1, 2013	$ 54,248
Liabilities assumed in acquisitions	659
Adjustments during the measurement period related to acquisitions	(10,201)
New asset retirement obligations	3,321
Accretion	3,536
Changes in estimates recorded to statement of income	(299)
Changes in estimates recorded to balance sheet	299
Expenditures	(3,837)
Currency translation and other	(232)
Balance at September 30, 2013	47,494
Credit-adjusted risk-free rate (as a percent)	6.60%
Landfill Retirement Liability
Changes to post-closure liabilities
Balance at January 1, 2013	26,658
Liabilities assumed in acquisitions	0
Adjustments during the measurement period related to acquisitions	0
New asset retirement obligations	3,321
Accretion	2,255
Changes in estimates recorded to statement of income	(398)
Changes in estimates recorded to balance sheet	299
Expenditures	(3,527)
Currency translation and other	(152)
Balance at September 30, 2013	28,456
Non-Landfill Retirement Liability
Changes to post-closure liabilities
Balance at January 1, 2013	27,590
Liabilities assumed in acquisitions	659
Adjustments during the measurement period related to acquisitions	(10,201)
New asset retirement obligations
Accretion	1,281
Changes in estimates recorded to statement of income	99
Changes in estimates recorded to balance sheet	0
Expenditures	(310)
Currency translation and other	(80)
Balance at September 30, 2013	$ 19,038

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EARNINGS PER SHARE (Tables)

9 Months Ended

Sep. 30, 2013

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				Nine Months Ended
	September 30,				September 30,
	2013		2012		2013		2012
Numerator for basic and diluted earnings per share:
Net income	$	35,361	$	12,359	$	68,765	$	67,800
Denominator:
Basic shares outstanding	60,610		53,374		60,542		53,303
Dilutive effect of equity-based compensation awards	150		191		150		216
Dilutive shares outstanding	60,760		53,565		60,692		53,519
Basic earnings per share:	$	0.58	$	0.23	$	1.14	$	1.27
Diluted earnings per share:	$	0.58	$	0.23	$	1.13	$	1.27

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GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION

9 Months Ended

Sep. 30, 2013

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 wholly-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 September 30, 2013 (in thousands):

	Clean Harbors, Inc.		U.S. Guarantor Subsidiaries		Foreign Non-Guarantor Subsidiaries		Consolidating Adjustments			Total
Assets:
Cash and cash equivalents	$	1,006	$	187,926	$	59,703	$	—		$	248,635
Intercompany receivables	336,356		2,369		174,609		(513,334		)	—
Other current assets	12,144		589,065		291,930		—			893,139
Property, plant and equipment, net	—		942,331		673,096		—			1,615,427
Investments in subsidiaries	2,601,246		929,111		144,953		(3,675,310		)	—
Intercompany debt receivable	—		508,524		3,701		(512,225		)	—
Other long-term assets	20,842		900,617		278,192		—			1,199,651
Total assets	$	2,971,594	$	4,059,943	$	1,626,184	$	(4,700,869	)	$	3,956,852
Liabilities and Stockholders’ Equity:
Current liabilities	$	40,600	$	472,178	$	156,754	$	—		$	669,532
Intercompany payables	—		510,906		2,428		(513,334		)	—
Closure, post-closure and remedial liabilities, net	—		158,366		33,482		—			191,848
Long-term obligations	1,400,000		—		—		—			1,400,000
Capital lease obligations, net	—		231		1,438		—			1,669
Intercompany debt payable	3,701		—		508,524		(512,225		)	—
Other long-term liabilities	51,173		124,441		42,069		—			217,683
Total liabilities	1,495,474		1,266,122		744,695		(1,025,559		)	2,480,732
Stockholders’ equity	1,476,120		2,793,821		881,489		(3,675,310		)	1,476,120
Total liabilities and stockholders’ equity	$	2,971,594	$	4,059,943	$	1,626,184	$	(4,700,869	)	$	3,956,852

Following is the condensed consolidating balance sheet at December 31, 2012 (in thousands):

	Clean Harbors, Inc.		U.S. Guarantor Subsidiaries		Foreign Non-Guarantor Subsidiaries		Consolidating Adjustments			Total
Assets:
Cash and cash equivalents	$	35,214	$	140,683	$	53,939	$	—		$	229,836
Intercompany receivables	296,023		17,704		116,571		(430,298		)	—
Other current assets	38,295		526,354		292,308		—			856,957
Property, plant and equipment, net	—		886,032		645,731		—			1,531,763
Investments in subsidiaries	2,528,699		850,011		144,953		(3,523,663		)	—
Intercompany debt receivable	—		508,067		3,701		(511,768		)	—
Other long-term assets	21,141		896,991		289,118		—			1,207,250
Total assets	$	2,919,372	$	3,825,842	$	1,546,321	$	(4,465,729	)	$	3,825,806
Liabilities and Stockholders’ Equity:
Current liabilities	$	32,586	$	402,990	$	133,476	$	—		$	569,052
Intercompany payables	—		412,594		17,704		(430,298		)	—
Closure, post-closure and remedial liabilities, net	—		161,175		36,172		—			197,347
Long-term obligations	1,400,000		—		—		—			1,400,000
Capital lease obligations, net	—		301		2,578		—			2,879
Intercompany debt payable	3,701		—		508,067		(511,768		)	—
Other long-term liabilities	51,013		134,393		39,050		—			224,456
Total liabilities	1,487,300		1,111,453		737,047		(942,066		)	2,393,734
Stockholders’ equity	1,432,072		2,714,389		809,274		(3,523,663		)	1,432,072
Total liabilities and stockholders’ equity	$	2,919,372	$	3,825,842	$	1,546,321	$	(4,465,729	)	$	3,825,806

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

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues
Service revenues	$	—		$	445,165		$	256,812		$	56		$	702,033
Product revenues	—			169,743			35,815			(56		)	205,502
Total revenues	—			614,908			292,627			—			907,535
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	—			300,859			177,519			56			478,434
Product cost of revenues	—			139,683			29,058			(56		)	168,685
Total cost of revenues	—			440,542			206,577			—			647,119
Selling, general and administrative expenses	29			81,496			32,939			—			114,464
Accretion of environmental liabilities	—			2,478			436			—			2,914
Depreciation and amortization	—			45,533			23,897			—			69,430
Income from operations	(29		)	44,859			28,778			—			73,608
Other expense	—			(111		)	(39		)	—			(150		)
Interest (expense) income	(19,844		)	137			381			—			(19,326		)
Equity in earnings of subsidiaries	58,919			21,064			—			(79,983		)	—
Intercompany dividend income (expense)	—			—			3,063			(3,063		)	—
Intercompany interest income (expense)	—			10,107			(10,107		)	—			—
Income before provision for income taxes	39,046			76,056			22,076			(83,046		)	54,132
Provision for income taxes	3,685			8,218			6,868			—			18,771
Net income	35,361			67,838			15,208			(83,046		)	35,361
Other comprehensive (loss) income	21,805			21,805			(10,072		)	(11,733		)	21,805
Comprehensive (loss) income	$	57,166		$	89,643		$	5,136		$	(94,779	)	$	57,166

Following is the consolidating statement of income (loss) for the three months ended September 30, 2012 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues
Service revenues	$	—		$	290,295		$	218,304		$	(4,871	)	$	503,728
Product revenues	—			24,527			5,678			(127		)	30,078
Total revenues	—			314,822			223,982			(4,998		)	533,806
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	—			198,793			154,836			(4,871		)	348,758
Product cost of revenues	—			19,904			4,405			(127		)	24,182
Total cost of revenues	—			218,697			159,241			(4,998		)	372,940
Selling, general and administrative expenses	9			35,810			24,520			—			60,339
Accretion of environmental liabilities	—			2,150			338			—			2,488
Depreciation and amortization	—			20,778			20,522			—			41,300
Income from operations	(9		)	37,387			19,361			—			56,739
Other (expense) income	—			(8		)	(83		)	—			(91		)
Loss on early extinguishment of debt	(26,385		)	—			—			—			(26,385		)
Interest expense	(11,247		)	180			(529		)	—			(11,596		)
Equity in earnings of subsidiaries	50,039			15,869			—			(65,908		)	—
Intercompany dividend income (expense)	—			—			3,439			(3,439		)	—
Intercompany interest income (expense)	—			10,290			(10,290		)	—			—
Income before provision for income taxes	12,398			63,718			11,898			(69,347		)	18,667
Provision for income taxes	39			3,831			2,438			—			6,308
Net income	12,359			59,887			9,460			(69,347		)	12,359
Other comprehensive income (loss)	29,980			29,980			13,042			(43,022		)	29,980
Comprehensive income (loss)	$	42,339		$	89,867		$	22,502		$	(112,369	)	$	42,339

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

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues
Service revenues	$	—		$	1,295,525		$	755,856		$	(2,854	)	$	2,048,527
Product revenues	—			463,301			119,267			(869		)	581,699
Total revenues	—			1,758,826			875,123			(3,723		)	2,630,226
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	—			873,945			531,318			(2,854		)	1,402,409
Product cost of revenues	—			395,891			100,038			(869		)	495,060
Total cost of revenues	—			1,269,836			631,356			(3,723		)	1,897,469
Selling, general and administrative expenses	84			266,941			98,521			—			365,546
Accretion of environmental liabilities	—			7,315			1,313			—			8,628
Depreciation and amortization	—			127,042			69,862			—			196,904
Income from operations	(84		)	87,692			74,071			—			161,679
Other income (expense)	—			2,858			(828		)	—			2,030
Interest (expense) income	(59,408		)	137			487			—			(58,784		)
Equity in earnings of subsidiaries	134,246			57,040			—			(191,286		)	—
Intercompany dividend income (expense)	—			—			10,031			(10,031		)	—
Intercompany interest income (expense)	—			30,414			(30,414		)	—			—
Income before provision for income taxes	74,754			178,141			53,347			(201,317		)	104,925
Provision for income taxes	5,989			14,753			15,418			—			36,160
Net income	68,765			163,388			37,929			(201,317		)	68,765
Other comprehensive (loss) income	(37,562		)	(37,562		)	20,385			17,177			(37,562		)
Comprehensive (loss) income	$	31,203		$	125,826		$	58,314		$	(184,140	)	$	31,203

Following is the consolidating statement of income (loss) for the nine months ended September 30, 2012 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues
Service revenues	$	—		$	850,737		$	687,924		$	(14,894	)	$	1,523,767
Product revenues	—			69,364			36,608			(793		)	105,179
Total revenues	—			920,101			724,532			(15,687		)	1,628,946
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	—			575,006			496,062			(14,894		)	1,056,174
Product cost of revenues	—			55,646			29,851			(793		)	84,704
Total cost of revenues	—			630,652			525,913			(15,687		)	1,140,878
Selling, general and administrative expenses	27			122,167			75,698			—			197,892
Accretion of environmental liabilities	—			6,430			979			—			7,409
Depreciation and amortization	—			56,568			60,226			—			116,794
Income from operations	(27		)	104,284			61,716			—			165,973
Other (expense) income	—			(333		)	(132		)	—			(465		)
Loss on early extinguishment of debt	(26,385		)	—			—			—			(26,385		)
Interest expense	(32,679		)	—			(1,157		)	—			(33,836		)
Equity in earnings of subsidiaries	124,965			49,236			—			(174,201		)	—
Intercompany dividend income (expense)	10,010			—			10,354			(20,364		)	—
Intercompany interest income (expense)	—			30,894			(30,894		)	—			—
Income before provision for income taxes	75,884			184,081			39,887			(194,565		)	105,287
Provision for income taxes	8,084			19,473			9,930			—			37,487
Net income	67,800			164,608			29,957			(194,565		)	67,800
Other comprehensive income (loss)	27,703			27,703			11,370			(39,073		)	27,703
Comprehensive income (loss)	$	95,503		$	192,311		$	41,327		$	(233,638	)	$	95,503

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

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Total
Net cash from operating activities	$	(38,228	)	$	176,844		$	141,498		$	280,114
Cash flows from investing activities:
Additions to property, plant and equipment	—			(101,813		)	(105,828		)	(207,641		)
Proceeds from sales of fixed assets	—			819			2,881			3,700
Acquisitions, net of cash acquired	—			(59,458		)	—			(59,458		)
Costs to obtain or renew permits	—			(221		)	(4,136		)	(4,357		)
Other	—			—			(11		)	(11		)
Net cash from investing activities	—			(160,673		)	(107,094		)	(267,767		)
Cash flows from financing activities:
Change in uncashed checks	—			9,427			327			9,754
Proceeds from exercise of stock options	399			—			—			399
Proceeds from employee stock purchase plan	5,327			—			—			5,327
Remittance of shares, net	(599		)	—			—			(599		)
Excess tax benefit of stock-based compensation	1,589			—			—			1,589
Deferred financing costs paid	(2,446		)	—			—			(2,446		)
Payments on capital leases	—			(178		)	(3,918		)	(4,096		)
Issuance costs related to 2012 issuance of common stock	(250		)							(250		)
Dividends (paid) / received	—			(10,284		)	10,284			—
Interest (payments) / received	—			32,107			(32,107		)	—
Net cash from financing activities	4,020			31,072			(25,414		)	9,678
Effect of exchange rate change on cash	—			—			(3,226		)	(3,226		)
(Decrease) increase in cash and cash equivalents	(34,208		)	47,243			5,764			18,799
Cash and cash equivalents, beginning of period	35,214			140,683			53,939			229,836
Cash and cash equivalents, end of period	$	1,006		$	187,926		$	59,703		$	248,635

Following is the condensed consolidating statement of cash flows for the nine months ended September 30, 2012 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Total
Net cash from operating activities	$	(49,918	)	$	98,497		$	184,113		$	232,692
Cash flows from investing activities:
Additions to property, plant and equipment	—			(75,664		)	(54,662		)	(130,326		)
Proceeds from sale of fixed assets	—			3,411			779			4,190
Acquisitions, net of cash acquired	—			(51,424		)	(41,051		)	(92,475		)
Costs to obtain or renew permits	—			(625		)	(1,784		)	(2,409		)
Purchase of available for sale securities	—			—			(10,517		)	(10,517		)
Other				603			4,517			5,120
Net cash from investing activities	—			(123,699		)	(102,718		)	(226,417		)
Cash flows from financing activities:
Change in uncashed checks	—			(7,771		)	(6,184		)	(13,955		)
Proceeds from exercise of stock options	231			—			—			231
Proceeds from employee stock purchase plan	4,627			—			—			4,627
Remittance of shares, net	(1,604		)	—			—			(1,604		)
Excess tax benefit of stock-based compensation	1,786			—			—			1,786
Deferred financing costs paid	(9,638		)	—			—			(9,638		)
Payments of capital leases	—			(781		)	(4,522		)	(5,303		)
Distribution of cash earned on employee participation plan	(55		)	—			—			(55		)
Principal payment on debt	$	(520,000	)	$	—		$	—		(520,000		)
Issuance of senior unsecured notes	800,000			—			—			800,000
Dividends (paid) / received	10,010			(23,669		)	13,659			—
Interest (payments) / received	—			43,954			(43,954		)	—
Net cash from financing activities	285,357			11,733			(41,001		)	256,089
Effect of exchange rate change on cash	—			—			527			527
Increase (decrease) in cash and cash equivalents	235,439			(13,469		)	40,921			262,891
Cash and cash equivalents, beginning of period	91,581			128,071			41,071			260,723
Cash and cash equivalents, end of period	$	327,020		$	114,602		$	81,992		$	523,614

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SEGMENT REPORTING

9 Months Ended

Sep. 30, 2013

Segment Reporting [Abstract]

SEGMENT REPORTING

SEGMENT REPORTING

During the first quarter of 2013, the Company adjusted its operating segments to integrate the business activities of Safety-Kleen, acquired in December 2012, and to incorporate other changes made in 2013 to the manner in which the Company manages its business, makes operating decisions and assesses its performance. The Company's operations are now managed in five reportable segments: Technical Services, Oil Re-refining and Recycling, SK Environmental Services, Industrial and Field Services and Oil and Gas Field Services. The prior year segment information has been recast to conform to the current year presentation.

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 are loss on early extinguishment of debt, other income (expense) and income from discontinued operations, net of tax as these amounts are not considered part of usual business operations. Transactions between the segments are accounted for at the Company’s estimate of fair value based on similar transactions with outside customers. 

The operations not managed through the Company’s five 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 five 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 five reportable segments. Corporate Items revenues for the nine months ended September 30, 2013 includes a one-time, non-cash reduction of approximately $10.2 million due to the impact of acquisition accounting adjustments on Safety-Kleen's historical deferred revenue balance at December 28, 2012. The revenue amounts of the five reportable segments for the nine months ended September 30, 2013 exclude such adjustments to maintain comparability with future operating results and reflect how the Company manages the business.

The following table reconciles third party revenues to direct revenues for the three and nine months ended September 30, 2013 and 2012 (in thousands). Third party revenue is revenue billed to outside customers by a particular segment. Direct revenue is the revenue allocated to the segment performing the provided service. The Company analyzes results of operations based on direct revenues because the Company believes that these revenues and related expenses best reflect the manner in which operations are managed. 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.

	For the Three Months Ended September 30, 2013
	Technical Services		Oil Re-refining and Recycling			SK Environmental Services		Industrial and Field Services			Oil and Gas Field Services			Corporate Items			Totals
Third party revenues	$	269,465	$	151,565		$	150,535	$	227,754		$	107,627		$	589		$	907,535
Intersegment revenues, net	35,406		(64,918		)	36,516		(7,322		)	318			—			—
Corporate Items, net	964		—			—		73			(114		)	(923		)	—
Direct revenues	$	305,835	$	86,647		$	187,051	$	220,505		$	107,831		$	(334	)	$	907,535

	For the Three Months Ended September 30, 2012
	Technical Services		Oil Re-refining and Recycling		SK Environmental Services		Industrial and Field Services			Oil and Gas Field Services			Corporate Items			Totals
Third party revenues	$	247,355	$	—	$	—	$	203,371		$	82,812		$	268		$	533,806
Intersegment revenues, net	6,951		—		—		(8,877		)	1,926			—			—
Corporate Items, net	665		—		—		100			(98		)	(667		)	—
Direct revenues	$	254,971	$	—	$	—	$	194,594		$	84,640		$	(399	)	$	533,806

	For the Nine Months Ended September 30, 2013
	Technical Services		Oil Re-refining and Recycling			SK Environmental Services		Industrial and Field Services			Oil and Gas Field Services			Corporate Items			Totals
Third party revenues	$	759,666	$	438,191		$	453,325	$	693,667		$	294,183		$	(8,806	)	$	2,630,226
Intersegment revenues, net	85,614		(186,053		)	126,441		(32,316		)	6,314			—			—
Corporate Items, net	3,155		—			84		184			(314		)	(3,109		)	—
Direct revenues	$	848,435	$	252,138		$	579,850	$	661,535		$	300,183		$	(11,915	)	$	2,630,226

	For the Nine Months Ended September 30, 2012
	Technical Services		Oil Re-refining and Recycling		SK Environmental Services		Industrial and Field Services			Oil and Gas Field Services			Corporate Items			Totals
Third party revenues	$	712,313	$	—	$	—	$	608,768		$	306,566		$	1,299		$	1,628,946
Intersegment revenues, net	24,235		—		—		(31,246		)	7,011			—			—
Corporate Items, net	1,805		—		—		48			(391		)	(1,462		)	—
Direct revenues	$	738,353	$	—	$	—	$	577,570		$	313,186		$	(163	)	$	1,628,946

The following table presents information used by management by 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 adjustments, and other (income) expense, to its segments.    

	For the Three Months Ended						For the Nine Months Ended
	September 30,						September 30,
	2013			2012			2013			2012
Adjusted EBITDA:
Technical Services	$	78,849		$	68,241		$	208,284		$	188,673
Oil Re-refining and Recycling	18,892			—			46,861			—
SK Environmental Services	22,951			—			84,162			—
Industrial and Field Services	48,096			43,278			138,638			117,914
Oil and Gas Field Services	20,854			14,132			52,372			62,299
Corporate Items	(43,690		)	(25,124		)	(149,547		)	(78,710		)
Total	$	145,952		$	100,527		$	380,770		$	290,176
Reconciliation to Consolidated Statements of Income:
Pre-tax, non-cash acquisition accounting adjustments	$	—		$	—		$	13,559		$	—
Accretion of environmental liabilities	2,914			2,488			8,628			7,409
Depreciation and amortization	69,430			41,300			196,904			116,794
Income from operations	73,608			56,739			161,679			165,973
Other expense (income)	150			91			(2,030		)	465
Loss on early extinguishment of debt	—			26,385			—			26,385
Interest expense, net of interest income	19,326			11,596			58,784			33,836
Income before provision for income taxes	$	54,132		$	18,667		$	104,925		$	105,287

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

	September 30, 2013		December 31, 2012
Property, plant and equipment, net
Technical Services	$	398,778	$	402,260
Oil Re-refining and Recycling	262,745		224,289
SK Environmental Services	193,760		195,172
Industrial and Field Services	410,776		371,335
Oil and Gas Field Services	240,863		257,985
Corporate Items	108,505		80,722
Total property, plant and equipment, net	$	1,615,427	$	1,531,763
Intangible assets:
Technical Services
Goodwill	$	47,917	$	48,157
Permits and other intangibles, net	81,689		85,842
Total Technical Services	129,606		133,999
Oil Re-refining and Recycling
Goodwill	215,816		215,704
Permits and other intangibles, net	233,259		222,182
Total Oil Re-refining and Recycling	449,075		437,886
SK Environmental Services
Goodwill	146,956		148,422
Permits and other intangibles, net	186,043		190,472
Total SK Environmental Services	332,999		338,894
Industrial and Field Services
Goodwill	140,927		141,726
Permits and other intangibles, net	36,854		41,143
Total Industrial and Field Services	177,781		182,869
Oil and Gas Field Services
Goodwill	38,536		39,762
Permits and other intangibles, net	29,931		33,178
Total Oil and Gas Field Services	68,467		72,940
Total	$	1,157,928	$	1,166,588

The following table presents total assets by reportable segment (in thousands):

	September 30, 2013		December 31, 2012
Technical Services	$	699,713	$	714,777
Oil Re-refining and Recycling	833,336		797,650
SK Environmental Services	642,557		647,746
Industrial and Field Services	645,183		607,654
Oil and Gas Field Services	310,481		348,771
Corporate Items	825,582		709,208
Total	$	3,956,852	$	3,825,806

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

	September 30, 2013		December 31, 2012
United States	$	2,665,328	$	2,564,609
Canada	1,287,090		1,260,421
Other foreign	4,434		776
Total	$	3,956,852	$	3,825,806

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BUSINESS COMBINATIONS (Evergreen Oil, Inc) (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 13, 2013 Evergreen Oil, Inc. [Member] operation	Sep. 30, 2013 Oil Re-Refining and Recycling [Member]	Dec. 31, 2012 Oil Re-Refining and Recycling [Member]	Sep. 13, 2013 Oil Re-Refining and Recycling [Member] Evergreen Oil, Inc. [Member]	Sep. 30, 2013 S K Environmental Services [Member]	Dec. 31, 2012 S K Environmental Services [Member]	Sep. 13, 2013 S K Environmental Services [Member] Evergreen Oil, Inc. [Member]
Business Acquisition [Line Items]
Outstanding common shares acquired (as a percent)			100.00%
Purchase price			$ 57,000,000
All-cash portion of purchase price			60,500,000
Net working capital adjustment included in purchase price			3,500,000
Threshold for working capital adjustment			1,000,000
Goodwill	$ 590,152,000	$ 593,771,000		$ 215,816,000	$ 215,704,000	$ 2,800,000	$ 146,956,000	$ 148,422,000	$ 400,000
Number of oil re-refining operations owned by the acquiree			1

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ACCRUED EXPENSES (Tables)

9 Months Ended

Sep. 30, 2013

Accrued Expenses [ABSTRACT]

Accrued expenses

Accrued expenses consisted of the following (in thousands):

	September 30, 2013		December 31, 2012
Insurance	$	54,105	$	48,243
Interest	17,900		20,061
Accrued disposal costs	1,498		1,835
Accrued compensation and benefits	71,030		70,250
Income, real estate, sales and other taxes	54,403		35,640
Other	57,877		56,400
Total accrued expenses	$	256,813	$	232,429

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STOCK-BASED COMPENSATION (Tables)

9 Months Ended

Sep. 30, 2013

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

Summary of the 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 nine months ended September 30, 2013, as well as the related weighted-average grant-date fair values:

	Three Months Ended			Nine Months Ended
	September 30, 2013			September 30, 2013
	Shares	Weighted Average Grant-Date Fair Value		Shares	Weighted Average Grant-Date Fair Value
Restricted stock awards	27,890	$	57.88	287,882	$	55.21
Performance stock awards	1,468	$	55.29	114,453	$	54.27
Total awards	29,358			402,335

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FAIR VALUE MEASUREMENTS (Details) (USD $)	3 Months Ended			9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012	Sep. 30, 2013		Sep. 30, 2012	Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Auction rate securities	$ 4,352,000			$ 4,352,000			$ 4,354,000
Marketable securities	11,787,000			11,787,000			11,778,000
Temporary decline in fair value of securities	(300,000)			(300,000)
Changes in the entity's auction rate securities measured at fair value on a recurring basis using significant unobservable inputs (Level 3)
Unrealized gain (loss) included in other comprehensive income - less than $0.1m for six months ended 2013				(100,000)		100,000
Fair Value, Measurements, Recurring [Member] | Total
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Auction rate securities	4,352,000	[1]		4,352,000	[1]		4,354,000	[1]
Derivative Assets	60,000	[2]		60,000	[2]		165,000	[2]
Marketable securities	11,787,000	[3]		11,787,000	[3]		11,778,000	[3]
Derivative Liabilities	239,000	[2]		239,000	[2]		1,242,000	[2]
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Auction rate securities		[1]			[1]			[1]
Derivative Assets		[2]			[2]		0	[2]
Marketable securities	11,787,000	[3]		11,787,000	[3]		11,778,000	[3]
Derivative Liabilities	0	[2]		0	[2]		0	[2]
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Auction rate securities		[1]			[1]			[1]
Derivative Assets	60,000	[2]		60,000	[2]		165,000	[2]
Marketable securities		[3]			[3]			[3]
Derivative Liabilities	239,000	[2]		239,000	[2]		1,242,000	[2]
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Auction rate securities	4,352,000	[1]		4,352,000	[1]		4,354,000	[1]
Derivative Assets	0	[2]		0	[2]		0	[2]
Marketable securities		[3]			[3]			[3]
Derivative Liabilities	0	[2]		0	[2]		0	[2]
Changes in the entity's auction rate securities measured at fair value on a recurring basis using significant unobservable inputs (Level 3)
Balance at the beginning of the period	4,352,000		4,326,000	4,354,000		4,245,000
Unrealized gain (loss) included in other comprehensive income - less than $0.1m for six months ended 2013	0		0	(2,000)		81,000
Balance at the end of the period	4,352,000		4,326,000	4,352,000		4,326,000
Unsecured Debt [Member] | Unsecured Senior Notes 2020 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Long-term Debt, Fair Value	780,900,000			780,900,000			816,000,000
Unsecured Debt [Member] | Unsecured Senior Notes 2021 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Long-term Debt, Fair Value	$ 573,100,000			$ 573,100,000			$ 623,500,000

[1] The auction rate securities are classified as available-for-sale and the fair value of these securities was estimated utilizing a probability discounted cash flow analysis. As of September 30, 2013, all of the Company's auction rate securities continue to have AAA underlying ratings. The Company attributes the $0.3 million decline in the fair value of the securities from the original cost basis to external liquidity issues rather than credit issues. The Company assessed the decline in value to be temporary because it does not intend to sell and it is more likely than not that the Company will not have to sell the securities before their maturity. During the nine months ended September 30, 2013 and 2012, the Company recorded an unrealized pre-tax loss of less than $0.1 million and a pre-tax gain of $0.1 million, respectively, on its auction rate securities.

[2] The fair value of derivatives is recorded based on the present value of cash flows using a crude oil forward rate curve.

[3] The fair value of marketable securities is recorded based on quoted market prices and changes in fair value were included in other comprehensive income.

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INVENTORIES AND SUPPLIES (Tables)

9 Months Ended

Sep. 30, 2013

Inventory Disclosure [Abstract]

Schedule of Inventory

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

	September 30,		December 31,
	2013		2012
Oil and oil products	$	63,450	$	77,735
Supplies and drums	61,888		63,540
Solvent and solutions	11,508		9,398
Other	18,455		20,768
Total inventories and supplies	$	155,301	$	171,441

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STOCK-BASED COMPENSATION (Details) (USD $)	3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013
Awards granted
Number of Shares	29,358	402,335
Restricted stock awards
Awards granted
Number of Shares	27,890	287,882
Weighted-Average Grant-Date Fair Value (in USD per share)	$ 57.88	$ 55.21
Performance stock awards
Awards granted
Number of Shares	1,468	114,453
Weighted-Average Grant-Date Fair Value (in USD per share)	$ 55.29	$ 54.27

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ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Foreign currency translation, Gross	$ 20,731	$ 29,086	$ (37,921)	$ 27,393
Foreign currency translation, Tax Effect	0	0	0	0
Foreign currency translation, Net of Tax	20,731	29,086	(37,921)	27,393
Unrealized gain (loss) on available-for-sale securities, Gross	1,227	1,040	420	373
Unrealized gain (loss) on available-for-sale securities, Tax Effect	(153)	(146)	(61)	(63)
Unrealized gain (loss) on available-for-sale securities, Net of Tax	1,074	894	359	310
Other comprehensive (loss) income, Gross	21,958	30,126	(37,501)	27,766
Other comprehensive (loss) income, Tax Effect	153	146	61	63
Other comprehensive income (loss)	21,805	29,980	(37,562)	27,703
Components of Other Accumulated Income, Net of Tax [Roll Forward]
Beginning balance			49,632
Other comprehensive loss, net of tax	21,805	29,980	(37,562)	27,703
Ending balance	12,070		12,070
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss)			(37,921)
Components of Other Accumulated Income, Net of Tax [Roll Forward]
Beginning balance			50,627
Other comprehensive loss, net of tax			(37,921)
Ending balance	12,706		12,706
Unrealized Gain (Loss) on Available-For-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss)			359
Components of Other Accumulated Income, Net of Tax [Roll Forward]
Beginning balance			660
Other comprehensive loss, net of tax			359
Ending balance	1,019		1,019
Unfunded Pension Liability [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss)			0
Components of Other Accumulated Income, Net of Tax [Roll Forward]
Beginning balance			(1,655)
Other comprehensive loss, net of tax			0
Ending balance	$ (1,655)		$ (1,655)

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BASIS OF PRESENTATION (Details)	9 Months Ended
	Sep. 30, 2013 segment
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of reportable segments	5

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GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION (Condensed Consolidating Statements of Cash Flows) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Condensed consolidating statement of cash flows
Net cash from operating activities	$ 280,114	$ 232,692
Cash flows from investing activities:
Additions to property, plant and equipment	(207,641)	(130,326)
Proceeds from sales of fixed assets	3,700	4,190
Acquisitions, net of cash acquired	(59,458)	(92,475)
Costs to obtain or renew permits	(4,357)	(2,409)
Purchase of marketable securities	0	(10,517)
Other	(11)	5,120
Net cash used in investing activities	(267,767)	(226,417)
Cash flows from financing activities:
Change in uncashed checks	9,754	(13,955)
Proceeds from exercise of stock options	399	231
Proceeds from employee stock purchase plan	5,327	4,627
Remittance of shares, net	(599)	(1,604)
Excess tax benefit of stock-based compensation	1,589	1,786
Deferred financing costs paid	(2,446)	(9,638)
Payments on capital leases	(4,096)	(5,303)
Issuance costs related to 2012 issuance of common stock	(250)	0
Distribution of cash earned on employee participation plan	0	(55)
Principal payment on debt	0	(520,000)
Issuance of senior unsecured notes	0	800,000
Dividends (paid) / received	0	0
Interest (payments) / received	0	0
Net cash from financing activities	9,678	256,089
Effect of exchange rate change on cash	(3,226)	527
Increase in cash and cash equivalents	18,799	262,891
Cash and cash equivalents, beginning of period	229,836	260,723
Cash and cash equivalents, end of period	248,635	523,614
Clean Harbors, Inc.
Condensed consolidating statement of cash flows
Net cash from operating activities	(38,228)	(49,918)
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
Purchase of marketable securities		0
Other	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	231
Proceeds from employee stock purchase plan	5,327	4,627
Remittance of shares, net	(599)	(1,604)
Excess tax benefit of stock-based compensation	1,589	1,786
Deferred financing costs paid	(2,446)	(9,638)
Payments on capital leases	0	0
Issuance costs related to 2012 issuance of common stock	(250)
Distribution of cash earned on employee participation plan		(55)
Principal payment on debt		(520,000)
Issuance of senior unsecured notes		800,000
Dividends (paid) / received	0	10,010
Interest (payments) / received	0	0
Net cash from financing activities	4,020	285,357
Effect of exchange rate change on cash	0	0
Increase in cash and cash equivalents	(34,208)	235,439
Cash and cash equivalents, beginning of period	35,214	91,581
Cash and cash equivalents, end of period	1,006	327,020
U.S. Guarantor Subsidiaries
Condensed consolidating statement of cash flows
Net cash from operating activities	176,844	98,497
Cash flows from investing activities:
Additions to property, plant and equipment	(101,813)	(75,664)
Proceeds from sales of fixed assets	819	3,411
Acquisitions, net of cash acquired	(59,458)	(51,424)
Costs to obtain or renew permits	(221)	(625)
Purchase of marketable securities		0
Other	0	603
Net cash used in investing activities	(160,673)	(123,699)
Cash flows from financing activities:
Change in uncashed checks	9,427	(7,771)
Proceeds from exercise of stock options	0	0
Proceeds from employee stock purchase plan	0	0
Remittance of shares, net	0	0
Excess tax benefit of stock-based compensation	0	0
Deferred financing costs paid	0	0
Payments on capital leases	(178)	(781)
Distribution of cash earned on employee participation plan		0
Principal payment on debt		0
Issuance of senior unsecured notes		0
Dividends (paid) / received	(10,284)	(23,669)
Interest (payments) / received	32,107	43,954
Net cash from financing activities	31,072	11,733
Effect of exchange rate change on cash	0	0
Increase in cash and cash equivalents	47,243	(13,469)
Cash and cash equivalents, beginning of period	140,683	128,071
Cash and cash equivalents, end of period	187,926	114,602
Foreign Non-Guarantor Subsidiaries
Condensed consolidating statement of cash flows
Net cash from operating activities	141,498	184,113
Cash flows from investing activities:
Additions to property, plant and equipment	(105,828)	(54,662)
Proceeds from sales of fixed assets	2,881	779
Acquisitions, net of cash acquired	0	(41,051)
Costs to obtain or renew permits	(4,136)	(1,784)
Purchase of marketable securities		(10,517)
Other	(11)	4,517
Net cash used in investing activities	(107,094)	(102,718)
Cash flows from financing activities:
Change in uncashed checks	327	(6,184)
Proceeds from exercise of stock options	0	0
Proceeds from employee stock purchase plan	0	0
Remittance of shares, net	0	0
Excess tax benefit of stock-based compensation	0	0
Deferred financing costs paid	0	0
Payments on capital leases	(3,918)	(4,522)
Distribution of cash earned on employee participation plan		0
Principal payment on debt		0
Issuance of senior unsecured notes		0
Dividends (paid) / received	10,284	13,659
Interest (payments) / received	(32,107)	(43,954)
Net cash from financing activities	(25,414)	(41,001)
Effect of exchange rate change on cash	(3,226)	527
Increase in cash and cash equivalents	5,764	40,921
Cash and cash equivalents, beginning of period	53,939	41,071
Cash and cash equivalents, end of period	$ 59,703	$ 81,992

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COMMITMENTS AND CONTINGENCIES

9 Months Ended

Sep. 30, 2013

Commitments and Contingencies Disclosure [Abstract]

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES

Legal and Administrative Proceedings

The Company’s waste management services 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 applications for permits and licenses by the Company and conformity with legal requirements, alleged violations of existing permits and licenses, or alleged responsibility arising 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 prior owners of certain of the Company’s facilities shipped wastes. 

At September 30, 2013 and December 31, 2012, the Company had recorded reserves of $41.8 million and $38.6 million, respectively, in the Company's financial statements for actual or probable liabilities related to the legal and administrative proceedings in which the Company was then involved, the principal of which are described below. At September 30, 2013 and December 31, 2012, the Company also believed that it was reasonably possible that the amount of these potential liabilities could be as much as $3.4 million and $3.5 million more, respectively. The Company periodically adjusts the aggregate amount of these reserves when these actual or probable liabilities are paid or otherwise discharged, new claims arise, or additional relevant information about existing or probable claims becomes available. As of September 30, 2013, the $41.8 million of reserves consisted of (i) $35.1 million related to pending legal or administrative proceedings, including Superfund liabilities, which were included in remedial liabilities on the consolidated balance sheets and (ii) $6.7 million primarily related to federal and state enforcement actions, which were included in accrued expenses on the consolidated balance sheets.

As of September 30, 2013, the principal legal and administrative proceedings in which the Company was involved, or which had been terminated during 2013, 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. By 1972, groundwater contamination had been identified, and the Quebec government provided an alternate water supply to the municipality of Ville Mercier.

In 1999, Ville Mercier and three neighboring municipalities filed separate legal proceedings against the Mercier Subsidiary and the Government of Quebec. The lawsuits assert that the defendants are jointly and severally responsible for the contamination of groundwater in the region, which they claim caused each municipality to incur additional costs to supply drinking water for their citizens since the 1970's and early 1980's. The four municipalities claim a Canadian dollar ("CDN") total of $1.6 million as damages for additional costs to obtain drinking water supplies and seek an injunctive order to obligate the defendants to remediate the groundwater in the region. The Quebec Government also sued the Mercier Subsidiary to recover approximately $17.4 million (CDN) of alleged past costs for constructing and operating a treatment system and providing alternative drinking water supplies.

On September 26, 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 September 30, 2013 and December 31, 2012, the Company had accrued $13.9 million and $14.2 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-Keen has been named as a potentially responsible party as described below under “Superfund Proceedings,” the principal such legal proceedings involving Safety-Kleen which were outstanding as of September 30, 2013 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 62 proceedings (excluding cases which have been settled but not formally dismissed) as of September 30, 2013, 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 September 30, 2013. From December 31, 2012 to September 30, 2013, 26 product liability claims were settled or dismissed. Due to the nature of these claims and the related insurance, Safety-Kleen 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. Safety-Kleen disputes the basis of the claims on numerous grounds, including that Safety-Kleen has contracts with numerous customers authorizing the assessment of such fees and that in cases where no contract exists Safety-Kleen provides customers with a document at the time of service reflecting the assessment of the fee, followed by an invoice itemizing the fee. It is Safety-Kleen's position that it had the right to assess fuel surcharges, that the customers consented to the charges and that the surcharges were voluntarily paid by the customers when presented with an invoice. The lawsuit is still in its initial stages of discovery, with the focus being whether a class will be certified. The class certification-related fact discovery cutoff was September 4, 2013, and a hearing on class certification is now scheduled to be held in early to mid-2014. The plaintiff has filed a motion to extend the discovery cutoff and trial date, but the court has not ruled on these requests. In late June 2012, a nearly identical lawsuit was filed by the same law firm on behalf of a California-based customer. That lawsuit contends, under various state law theories, that Safety-Kleen impermissibly assessed fuel surcharges and late payment fees, and seeks certification of a class of California customers only. Safety-Kleen will assert the same defenses as in the Alabama litigation. In December 2012, a similar suit was filed by the same law firm on behalf of a Missouri-based customer which contends under various state law theories that Safety-Kleen impermissibly assessed fuel surcharges and seeks certification of a class of Missouri customers only. Safety-Kleen will assert the same defenses as in the Alabama and California cases. The Company is unable to ascertain the ultimate aggregate amount of monetary liability or financial impact with respect to these matters as of September 30, 2013, 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 122 sites which are subject to or are proposed to become subject to proceedings under federal or state Superfund laws. Of the 122 sites, two involve facilities that are now owned by the Company and 120 involve third party sites to which either the Company or the prior owners shipped wastes. 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 such indemnification provisions, for cleanup and remediation costs, related legal and consulting costs associated with PRP investigations, settlements, and related legal and administrative proceedings. The amount of such actual and potential liability is inherently difficult to estimate because of, among other relevant factors, uncertainties as to the legal liability (if any) of the Company or the prior owners of certain of the Company's facilities to contribute a portion of the cleanup costs, the assumptions that must be made in calculating the estimated cost and timing of remediation, the identification of other PRPs and their respective capability and obligation to contribute to remediation efforts, and the existence and legal standing of indemnification agreements (if any) with prior owners, which may either benefit the Company or subject the Company to potential indemnification obligations.

The Company's potential liability for cleanup costs at the two facilities now owned by the Company and at 35 (the "Listed Third Party Sites") of the 120 third party sites arose out of the Company's 2002 acquisition of substantially all of the assets (the "CSD assets") of the Chemical Services Division of Safety-Kleen Corp. As part of the purchase price for the CSD assets, the Company became liable as the owner of these two facilities and also agreed to indemnify the prior owners of the CSD assets against their share of certain cleanup costs for the Listed Third Party Sites payable to governmental entities under federal or state Superfund laws. Of the 35 Listed Third Party Sites, six are currently requiring expenditures on remediation, 13 are now settled, and 16 are not currently requiring expenditures on remediation. The status of the two facilities owned by the Company (the Wichita Property and the BR Facility) are further described below.

The 120 Superfund sites described above include 69 sites for which the Company had been notified it is a PRP or potential PRP prior to the Company's acquisition of Safety-Kleen on December 28, 2012, and an additional 50 sites at which Safety-Kleen had been notified it is a PRP or potential PRP prior to such acquisition. The total number of Superfund sites at which the Company had at September 30, 2013 potential liability and the total dollar amount of such estimated liability relating to those sites as described above have been increased to reflect the additional potential Superfund liabilities to which the Company became subject as a result of the Safety-Kleen acquisition. One of the third party sites (the Marine Shale site) is further described below.

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 its 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 as part of the CSD assets 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.

Marine Shale Site.    Prior to 1996, Marine Shale Processors, Inc. ("Marine Shale") operated a kiln in Amelia, Louisiana which incinerated waste producing a vitrified aggregate as a by-product. Marine Shale contended that its operation recycled waste into a useful product, i.e., vitrified aggregate, and therefore was exempt from regulation under the RCRA and permitting requirements as a hazardous waste incinerator under applicable federal and state environmental laws. The EPA contended that Marine Shale was a "sham-recycler" subject to the regulation and permitting requirements as a hazardous waste incinerator under the U.S. Resource Conservation and Recovery Act ("RCRA"), that its vitrified aggregate by-product was a hazardous waste, and that Marine Shale's continued operation without required permits was illegal. Litigation between the EPA and Marine Shale began in 1990 and continued until July 1996, when the U.S. Fifth Circuit Court of Appeals ordered Marine Shale to shut down its operations.

Certain of the former owners of the CSD assets were major customers of Marine Shale, but the Marine Shale site was not included as a Listed Third Party Site in connection with the Company's acquisition of the CSD assets and Clean Harbors was never a customer of Marine Shale. A Safety-Kleen subsidiary was, however, a Marine Shale customer and has been named a PRP. On May 11, 2007, the EPA and the LDEQ issued a special notice to the Company and other PRPs, seeking a good faith offer to address site remediation at the former Marine Shale facility. The Company has joined with other parties to form a group (the "Site Group") to retain common counsel and participate in further negotiations with the EPA and the LDEQ directed towards the eventual remediation of the Marine Shale site. The Site Group made a good faith settlement offer to the EPA on November 29, 2007, and negotiations among the EPA, the LDEQ and the Site Group with respect to the Marine Shale site are ongoing. At September 30, 2013 and December 31, 2012, the amount of the Company's reserves relating to the Marine Shale site were $4.5 million and $4.4 million, respectively.

Certain Other Third Party Sites.    At 11 of the 120 third party sites, Clean Harbors has an indemnification agreement with ChemWaste, a former subsidiary of Waste Management, Inc., and at five additional of those 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 120 third party sites discussed above. In addition to the Wichita Property, the BR Facility and Marine Shale, Clean Harbors has 12 sites at which it believes its potential liability could exceed $100,000.

Federal, State and Provincial Enforcement Actions

From time to time, the Company pays fines or penalties in regulatory proceedings relating primarily to waste treatment, storage or disposal facilities. As of September 30, 2013 and December 31, 2012, there were five and four 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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UNAUDITED CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Net income	$ 35,361	$ 12,359	$ 68,765	$ 67,800
Other Comprehensive Income [Abstract]
Unrealized gains on available-for-sale securities (net of taxes of $153 and $61 for the quarter and year-to-date 2013 and $146 and $63 for the quarter and year-to date 2012, respectively)	1,074	894	359	310
Foreign currency translation adjustments	20,731	29,086	(37,921)	27,393
Other comprehensive income (loss)	21,805	29,980	(37,562)	27,703
Comprehensive income	$ 57,166	$ 42,339	$ 31,203	$ 95,503

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UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash flows from operating activities:
Net income	$ 68,765	$ 67,800
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	196,904	116,794
Pre-tax, non-cash acquisition accounting adjustments	13,559	0
Allowance for doubtful accounts	5,281	809
Amortization of deferred financing costs and debt discount	2,539	1,173
Accretion of environmental liabilities	8,628	7,409
Changes in environmental liability estimates	(2,417)	(3,553)
Deferred income taxes	272	(494)
Stock-based compensation	6,389	5,235
Excess tax benefit of stock-based compensation	(1,589)	(1,786)
Income tax benefit related to stock option exercises	1,579	1,776
Other expense (income)	(2,030)	465
Write-off of deferred financing costs and debt premium	0	5,341
Environmental expenditures	(15,928)	(7,833)
Changes in assets and liabilities, net of acquisitions
Accounts receivable	(72,377)	59,881
Inventories and supplies	1,710	(7,692)
Other current assets	11,860	12,822
Accounts payable	37,257	(18,969)
Other current and long-term liabilities	19,712	(6,486)
Net cash from operating activities	280,114	232,692
Cash flows from investing activities:
Additions to property, plant and equipment	(207,641)	(130,326)
Proceeds from sales of fixed assets	3,700	4,190
Acquisitions, net of cash acquired	(59,458)	(92,475)
Additions to intangible assets, including costs to obtain or renew permits	(4,357)	(2,409)
Purchase of marketable securities	0	(10,517)
Other	(11)	5,120
Net cash used in investing activities	(267,767)	(226,417)
Cash flows from financing activities:
Change in uncashed checks	9,754	(13,955)
Proceeds from exercise of stock options	399	231
Remittance of shares, net	(599)	(1,604)
Proceeds from employee stock purchase plan	5,327	4,627
Deferred financing costs paid	(2,446)	(9,638)
Payments on capital leases	(4,096)	(5,303)
Principal payment on debt	0	(520,000)
Issuance of senior unsecured notes, including premium	0	800,000
Issuance costs related to 2012 issuance of common stock	(250)	0
Distribution of cash earned on employee participation plan	0	(55)
Excess tax benefit of stock-based compensation	1,589	1,786
Net cash from financing activities	9,678	256,089
Effect of exchange rate change on cash	(3,226)	527
Increase in cash and cash equivalents	18,799	262,891
Cash and cash equivalents, beginning of period	229,836	260,723
Cash and cash equivalents, end of period	248,635	523,614
Cash payments for interest and income taxes:
Interest paid	58,084	41,176
Income taxes paid	8,386	5,578
Non-cash investing and financing activities:
Property, plant and equipment accrued	39,804	31,978
Transfer of inventory to property, plant and equipment	$ 11,369	$ 0

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SIGNIFICANT ACCOUNTING POLICIES

9 Months Ended

Sep. 30, 2013

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, 2012. On December 28, 2012, the Company acquired 100% of the outstanding common shares of Safety-Kleen. There have been no changes in these policies or their application, other than as described below related to certain policies applicable to Safety-Kleen. See Note 3, “Business Combinations.” No revenue, expense, income or loss of Safety-Kleen was included in the Company's consolidated statements of income for the year ended December 31, 2012 due to the immateriality of Safety-Kleen's operating results subsequent to December 28, 2012.

Safety-Kleen's operating results are included in the Company's unaudited consolidated statements of income for the three and nine months ended September 30, 2013, and reflect the application of certain significant accounting policies as described below:

Revenue Recognition and Deferred Revenue

S-K Environmental Services revenue is generated from providing parts cleaning services, containerized waste services, oil collection services and other complementary products and services.

Parts cleaning services generally consist of placing a specially designed parts washer at a customer's premises and then, on a recurring basis, delivering clean solvent or aqueous-based washing fluid, cleaning and servicing the parts washer and removing the used solvent or aqueous fluid. The Company also services customer-owned parts washers. Revenue from parts cleaning services is recognized over the service interval. Service intervals represent the actual amount of time between service visits to a particular parts cleaning customer. Average service intervals vary from seven to 14 weeks depending on several factors, such as customer accommodation, types of machines serviced and frequency of use.

Containerized waste services consist of profiling, collecting, transporting and recycling or disposing of a wide variety of hazardous and non-hazardous wastes. Revenue is recognized upon disposal. The Company tracks the amount of time it takes from collection of the customer's waste to delivery to the disposal outlet, which represents a deferral period of approximately two and one-half weeks.

Other complementary products and services include vacuum services, allied products and other environmental services. Revenue is recognized when products are delivered and services are performed.

Oil Re-refining and Recycling revenue is generated from re-refining used oil to produce high quality base and blended lubricating oils, and recycling used oil collected in excess of the Company's re-refining capacity into recycled fuel oil. The high quality base and blended lubricating oils are sold to third-party distributors, retailers, government agencies, fleets, railroads and industrial customers. The recycled fuel oil is sold to asphalt plants, industrial plants, blenders, pulp and paper companies, vacuum gas oil producers and marine diesel oil producers. Revenue is recognized upon delivery.

Deferred Costs Relating to Deferred Revenue

Commissions and other incremental direct costs, primarily costs of materials and transportation expenses, relating to deferred revenue from the Company’s parts cleaning services, containerized waste services and vacuum services are capitalized and deferred. The deferred costs are included in current assets in the consolidated balance sheet and expensed when the related revenues are recognized.

Recent Accounting Pronouncements

In July 2013, the Financial Accounting Standards Board (“FASB”) issued 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 guidance is effective for the Company on January 1, 2014. Management does not expect the adoption of this standard to have a significant impact on the Company's consolidated balance sheets.

In February 2013, the FASB issued ASU 2013-02 Comprehensive Income (Topic 220) - Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income. The new guidance requires an entity to provide information about the amounts reclassified out of accumulated other comprehensive income (“AOCI”) by component. Entities are required to present, either on the face of the income statement where net income is presented or in the notes, significant amounts reclassified out of AOCI by respective line items of net income if the amount reclassified is required under U.S. GAAP to be reclassified to net income in its entirety in the same reporting period. For other amounts that are not required to be reclassified in their entirety to net income, entities are required to cross-reference the disclosures required under U.S. GAAP that provide additional detail about those amounts. This guidance is effective prospectively for annual and interim reporting periods beginning after December 31, 2012. The Company adopted the standard on January 1, 2013. The amounts required to be disclosed under this guidance are disclosed in Note 14, “Accumulated Other Comprehensive Income.”

Reclassifications

The Company's revenues and cost of revenues in the consolidated statements of income for the three and nine months ended September 30, 2012 and the changes in assets and liabilities, net of acquisitions in the consolidated statements of cash flows for the nine months ended September 30, 2012 have been reclassified to conform to the current year presentation.

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UNAUDITED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands, unless otherwise specified	Total	Common Stock	Shares Held Under Employee Participation Plan	Additional Paid-in Capital	Accumulated Other Comprehensive (Loss) Income	Accumulated Earnings
Balance at Dec. 31, 2012	$ 1,432,072	$ 604	$ (469)	$ 880,979	$ 49,632	$ 501,326
Balance (in shares) at Dec. 31, 2012		60,385
Increase (Decrease) in Stockholders' Equity
Net income	68,765					68,765
Other comprehensive loss	(37,562)				(37,562)
Stock-based compensation	6,389			6,389
Stock-based compensation (in shares)		57
Issuance of restricted shares, net of shares remitted	(599)			(599)
Issuance of restricted shares, net of shares remitted (in shares)		(14)
Issuance costs related to 2012 issuance of common stock	(250)			(250)
Exercise of stock options	399	2		397
Exercise of stock options (in shares)		61
Net tax benefit on exercise of stock-based awards	1,579			1,579
Net tax benefit on exercise of stock options (in shares)		0
Employee stock purchase plan	5,327			5,327
Employee stock purchase plan (in shares)		123
Balance at Sep. 30, 2013	$ 1,476,120	$ 606	$ (469)	$ 893,822	$ 12,070	$ 570,091
Balance (in shares) at Sep. 30, 2013		60,612

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SEGMENT REPORTING (Tables)

9 Months Ended

Sep. 30, 2013

Segment Reporting [Abstract]

Reconciliation of third party revenues to direct revenues

	For the Three Months Ended September 30, 2013
	Technical Services		Oil Re-refining and Recycling			SK Environmental Services		Industrial and Field Services			Oil and Gas Field Services			Corporate Items			Totals
Third party revenues	$	269,465	$	151,565		$	150,535	$	227,754		$	107,627		$	589		$	907,535
Intersegment revenues, net	35,406		(64,918		)	36,516		(7,322		)	318			—			—
Corporate Items, net	964		—			—		73			(114		)	(923		)	—
Direct revenues	$	305,835	$	86,647		$	187,051	$	220,505		$	107,831		$	(334	)	$	907,535

	For the Three Months Ended September 30, 2012
	Technical Services		Oil Re-refining and Recycling		SK Environmental Services		Industrial and Field Services			Oil and Gas Field Services			Corporate Items			Totals
Third party revenues	$	247,355	$	—	$	—	$	203,371		$	82,812		$	268		$	533,806
Intersegment revenues, net	6,951		—		—		(8,877		)	1,926			—			—
Corporate Items, net	665		—		—		100			(98		)	(667		)	—
Direct revenues	$	254,971	$	—	$	—	$	194,594		$	84,640		$	(399	)	$	533,806

	For the Nine Months Ended September 30, 2013
	Technical Services		Oil Re-refining and Recycling			SK Environmental Services		Industrial and Field Services			Oil and Gas Field Services			Corporate Items			Totals
Third party revenues	$	759,666	$	438,191		$	453,325	$	693,667		$	294,183		$	(8,806	)	$	2,630,226
Intersegment revenues, net	85,614		(186,053		)	126,441		(32,316		)	6,314			—			—
Corporate Items, net	3,155		—			84		184			(314		)	(3,109		)	—
Direct revenues	$	848,435	$	252,138		$	579,850	$	661,535		$	300,183		$	(11,915	)	$	2,630,226

	For the Nine Months Ended September 30, 2012
	Technical Services		Oil Re-refining and Recycling		SK Environmental Services		Industrial and Field Services			Oil and Gas Field Services			Corporate Items			Totals
Third party revenues	$	712,313	$	—	$	—	$	608,768		$	306,566		$	1,299		$	1,628,946
Intersegment revenues, net	24,235		—		—		(31,246		)	7,011			—			—
Corporate Items, net	1,805		—		—		48			(391		)	(1,462		)	—
Direct revenues	$	738,353	$	—	$	—	$	577,570		$	313,186		$	(163	)	$	1,628,946

Reconciliation to consolidated statements of income to adjusted EBITDA

The following table presents information used by management by 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 adjustments, and other (income) expense, to its segments.    

	For the Three Months Ended						For the Nine Months Ended
	September 30,						September 30,
	2013			2012			2013			2012
Adjusted EBITDA:
Technical Services	$	78,849		$	68,241		$	208,284		$	188,673
Oil Re-refining and Recycling	18,892			—			46,861			—
SK Environmental Services	22,951			—			84,162			—
Industrial and Field Services	48,096			43,278			138,638			117,914
Oil and Gas Field Services	20,854			14,132			52,372			62,299
Corporate Items	(43,690		)	(25,124		)	(149,547		)	(78,710		)
Total	$	145,952		$	100,527		$	380,770		$	290,176
Reconciliation to Consolidated Statements of Income:
Pre-tax, non-cash acquisition accounting adjustments	$	—		$	—		$	13,559		$	—
Accretion of environmental liabilities	2,914			2,488			8,628			7,409
Depreciation and amortization	69,430			41,300			196,904			116,794
Income from operations	73,608			56,739			161,679			165,973
Other expense (income)	150			91			(2,030		)	465
Loss on early extinguishment of debt	—			26,385			—			26,385
Interest expense, net of interest income	19,326			11,596			58,784			33,836
Income before provision for income taxes	$	54,132		$	18,667		$	104,925		$	105,287

PP&E and intangible assets by segment

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

	September 30, 2013		December 31, 2012
Property, plant and equipment, net
Technical Services	$	398,778	$	402,260
Oil Re-refining and Recycling	262,745		224,289
SK Environmental Services	193,760		195,172
Industrial and Field Services	410,776		371,335
Oil and Gas Field Services	240,863		257,985
Corporate Items	108,505		80,722
Total property, plant and equipment, net	$	1,615,427	$	1,531,763
Intangible assets:
Technical Services
Goodwill	$	47,917	$	48,157
Permits and other intangibles, net	81,689		85,842
Total Technical Services	129,606		133,999
Oil Re-refining and Recycling
Goodwill	215,816		215,704
Permits and other intangibles, net	233,259		222,182
Total Oil Re-refining and Recycling	449,075		437,886
SK Environmental Services
Goodwill	146,956		148,422
Permits and other intangibles, net	186,043		190,472
Total SK Environmental Services	332,999		338,894
Industrial and Field Services
Goodwill	140,927		141,726
Permits and other intangibles, net	36,854		41,143
Total Industrial and Field Services	177,781		182,869
Oil and Gas Field Services
Goodwill	38,536		39,762
Permits and other intangibles, net	29,931		33,178
Total Oil and Gas Field Services	68,467		72,940
Total	$	1,157,928	$	1,166,588

Total assets by segment

The following table presents total assets by reportable segment (in thousands):

	September 30, 2013		December 31, 2012
Technical Services	$	699,713	$	714,777
Oil Re-refining and Recycling	833,336		797,650
SK Environmental Services	642,557		647,746
Industrial and Field Services	645,183		607,654
Oil and Gas Field Services	310,481		348,771
Corporate Items	825,582		709,208
Total	$	3,956,852	$	3,825,806

Total assets by geographical area

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

	September 30, 2013		December 31, 2012
United States	$	2,665,328	$	2,564,609
Canada	1,287,090		1,260,421
Other foreign	4,434		776
Total	$	3,956,852	$	3,825,806

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SIGNIFICANT ACCOUNTING POLICIES (Policies)

9 Months Ended

Sep. 30, 2013

Accounting Policies [Abstract]

Revenue Recognition and Deferred Revenue

Revenue Recognition and Deferred Revenue

S-K Environmental Services revenue is generated from providing parts cleaning services, containerized waste services, oil collection services and other complementary products and services.

Parts cleaning services generally consist of placing a specially designed parts washer at a customer's premises and then, on a recurring basis, delivering clean solvent or aqueous-based washing fluid, cleaning and servicing the parts washer and removing the used solvent or aqueous fluid. The Company also services customer-owned parts washers. Revenue from parts cleaning services is recognized over the service interval. Service intervals represent the actual amount of time between service visits to a particular parts cleaning customer. Average service intervals vary from seven to 14 weeks depending on several factors, such as customer accommodation, types of machines serviced and frequency of use.

Containerized waste services consist of profiling, collecting, transporting and recycling or disposing of a wide variety of hazardous and non-hazardous wastes. Revenue is recognized upon disposal. The Company tracks the amount of time it takes from collection of the customer's waste to delivery to the disposal outlet, which represents a deferral period of approximately two and one-half weeks.

Other complementary products and services include vacuum services, allied products and other environmental services. Revenue is recognized when products are delivered and services are performed.

Oil Re-refining and Recycling revenue is generated from re-refining used oil to produce high quality base and blended lubricating oils, and recycling used oil collected in excess of the Company's re-refining capacity into recycled fuel oil. The high quality base and blended lubricating oils are sold to third-party distributors, retailers, government agencies, fleets, railroads and industrial customers. The recycled fuel oil is sold to asphalt plants, industrial plants, blenders, pulp and paper companies, vacuum gas oil producers and marine diesel oil producers. Revenue is recognized upon delivery.

Deferred Costs Relating to Deferred Revenue

Deferred Costs Relating to Deferred Revenue

Commissions and other incremental direct costs, primarily costs of materials and transportation expenses, relating to deferred revenue from the Company’s parts cleaning services, containerized waste services and vacuum services are capitalized and deferred. The deferred costs are included in current assets in the consolidated balance sheet and expensed when the related revenues are recognized.

Recent Accounting Pronouncements

Recent Accounting Pronouncements

In July 2013, the Financial Accounting Standards Board (“FASB”) issued 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 guidance is effective for the Company on January 1, 2014. Management does not expect the adoption of this standard to have a significant impact on the Company's consolidated balance sheets.

In February 2013, the FASB issued ASU 2013-02 Comprehensive Income (Topic 220) - Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income. The new guidance requires an entity to provide information about the amounts reclassified out of accumulated other comprehensive income (“AOCI”) by component. Entities are required to present, either on the face of the income statement where net income is presented or in the notes, significant amounts reclassified out of AOCI by respective line items of net income if the amount reclassified is required under U.S. GAAP to be reclassified to net income in its entirety in the same reporting period. For other amounts that are not required to be reclassified in their entirety to net income, entities are required to cross-reference the disclosures required under U.S. GAAP that provide additional detail about those amounts. This guidance is effective prospectively for annual and interim reporting periods beginning after December 31, 2012. The Company adopted the standard on January 1, 2013. The amounts required to be disclosed under this guidance are disclosed in Note 14, “Accumulated Other Comprehensive Income.”

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PROPERTY, PLANT, AND EQUIPMENT (Tables)

9 Months Ended

Sep. 30, 2013

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

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

	September 30,		December 31,
	2013		2012
Land	$	100,133	$	106,037
Asset retirement costs (non-landfill)	10,748		10,450
Landfill assets	93,104		77,952
Buildings and improvements	324,646		329,617
Camp equipment	135,377		135,827
Vehicles	419,581		385,172
Equipment	1,164,838		1,061,090
Furniture and fixtures	5,244		6,757
Construction in progress	129,385		31,780
	2,383,056		2,144,682
Less - accumulated depreciation and amortization	767,629		612,919
Total property, plant and equipment, net	$	1,615,427	$	1,531,763

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FINANCING ARRANGEMENTS (Tables)

9 Months Ended

Sep. 30, 2013

Debt Disclosure [Abstract]

Summary of the entity's financial arrangements

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

	September 30, 2013		December 31, 2012
Senior unsecured notes, at 5.25%, due August 1, 2020	$	800,000	$	800,000
Senior unsecured notes, at 5.125%, due June 1, 2021	600,000		600,000
Revolving credit facility, due January 17, 2018	—		—
Long-term obligations	$	1,400,000	$	1,400,000

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GOODWILL AND OTHER INTANGIBLE ASSETS (Expected Future Amortization) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2013 (three months)	$ 10,816
2014	42,308
2015	40,704
2016	39,210
2017	36,528
Thereafter	282,705
Finite-Lived Intangible Assets, Net	$ 452,271	$ 457,297

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FAIR VALUE MEASUREMENTS (Derivative Financial Instruments) (Details) (Cashless Collar Contract [Member], USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 11, 2013 bbl	Aug. 13, 2013 bbl	Jul. 08, 2013 bbl	Jun. 10, 2013 bbl	May 06, 2013 bbl	Apr. 02, 2013 bbl	Mar. 07, 2013 bbl	Feb. 07, 2013 bbl	Jan. 08, 2013 bbl	Dec. 07, 2012 bbl	Nov. 09, 2012 bbl	Oct. 04, 2012 bbl	Sep. 11, 2012 bbl	Aug. 03, 2012 bbl
Derivative [Line Items]
Barrels of oil per Month		148,810	148,810	148,810	148,810	148,810	148,810	148,810	148,810	148,810	148,810	148,810	148,810	148,810	148,810
Floor		75.00	75.00	75.00	75.00	75.00	75.00	75.00	75.00	75.00	75.00	75.00	75.00	75.00	75.00
Cap		124.00	122.60	120.75	120.65	122.00	130.00	125.75	134.70	129.00	124.70	130.00	127.50	137.50	130.00
Assets, Fair Value	$ 60
Liabilities, Fair Value	239
Trade Date, February 7, 2012 [Member]
Derivative [Line Items]
Assets, Fair Value	24
Trade Date, April 2, 2013 [Member]
Derivative [Line Items]
Assets, Fair Value	21
Trade Date, September 11, 2013 [Member]
Derivative [Line Items]
Assets, Fair Value	15
Trade Date September 11, 2012 [Member]
Derivative [Line Items]
Liabilities, Fair Value	3
Trade Date December 7, 2012 [Member]
Derivative [Line Items]
Liabilities, Fair Value	33
Trade Date, March 7, 2013 [Member]
Derivative [Line Items]
Liabilities, Fair Value	10
Trade Date, May 6, 2013 [Member]
Derivative [Line Items]
Liabilities, Fair Value	37
Trade Date, July 8, 2013 [Member]
Derivative [Line Items]
Liabilities, Fair Value	39
Trade Date August 3, 2012 [Member]
Derivative [Line Items]
Liabilities, Fair Value	0
Trade Date October 4, 2012 [Member]
Derivative [Line Items]
Liabilities, Fair Value	14
Trade Date November 9, 2012 [Member]
Derivative [Line Items]
Liabilities, Fair Value	13
Trade Date January 8, 2013 [Member]
Derivative [Line Items]
Liabilities, Fair Value	10
Trade Date, June 10, 2013 [Member]
Derivative [Line Items]
Liabilities, Fair Value	66
Trade Date, August 13, 2013 [Member]
Derivative [Line Items]
Liabilities, Fair Value	$ 14

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SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition and Deferred Revenue (Details) (S K Environmental Services [Member])	9 Months Ended
	Sep. 30, 2013
Parts cleaning services [Member] | Minimum [Member]
Segment Reporting Information [Line Items]
Service period	49 days
Parts cleaning services [Member] | Maximum [Member]
Segment Reporting Information [Line Items]
Service period	98 days
Containerized waste services [Member]
Segment Reporting Information [Line Items]
Revenue deferral period	two and one-half weeks

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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Allowance for Doubtful Accounts Receivable, Current	$ 17,824	$ 11,125
Accrued Capping, Closure, Post-closure and Environmental Costs	7,512	8,791
Accrued Environmental Loss Contingencies, Current	$ 20,225	$ 15,330
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	60,612,702	60,385,453
Common Stock, Shares, Outstanding	60,612,702	60,385,453

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INVENTORIES AND SUPPLIES

9 Months Ended

Sep. 30, 2013

Inventory Disclosure [Abstract]

INVENTORIES AND SUPPLIES

INVENTORIES AND SUPPLIES

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

	September 30,		December 31,
	2013		2012
Oil and oil products	$	63,450	$	77,735
Supplies and drums	61,888		63,540
Solvent and solutions	11,508		9,398
Other	18,455		20,768
Total inventories and supplies	$	155,301	$	171,441

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UNAUDITED CONSOLIDATED STATEMENTS OF INCOME (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Interest income	$ 96	$ 221	$ 362	$ 623

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REMEDIAL LIABILITIES (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at January 1, 2013	$ 167,220
Liabilities assumed in acquisitions	2,384
Adjustments during the measurement period related to acquisitions	12,581
Accretion	5,092
Changes in estimates recorded to statement of income	(2,118)
Expenditures	(12,091)
Currency translation and other	(977)
Balance at September 30, 2013	172,091
Remedial Liabilities for Landfill Sites
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at January 1, 2013	5,829
Liabilities assumed in acquisitions	0
Adjustments during the measurement period related to acquisitions	0
Accretion	210
Changes in estimates recorded to statement of income	(62)
Expenditures	(67)
Currency translation and other	(108)
Balance at September 30, 2013	5,802
Remedial Liabilities for Inactive Sites
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at January 1, 2013	71,079
Liabilities assumed in acquisitions	0
Adjustments during the measurement period related to acquisitions	8,855
Accretion	2,505
Changes in estimates recorded to statement of income	(2,341)
Expenditures	(6,307)
Currency translation and other	(54)
Balance at September 30, 2013	73,737
Remedial Liabilities (Including Superfund) for Non-Landfill Operations
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at January 1, 2013	90,312
Liabilities assumed in acquisitions	2,384
Adjustments during the measurement period related to acquisitions	3,726
Accretion	2,377
Changes in estimates recorded to statement of income	285
Expenditures	(5,717)
Currency translation and other	(815)
Balance at September 30, 2013	$ 92,552

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CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 248,635	$ 229,836
Marketable securities	11,787	11,778
Accounts receivable, net of allowances aggregating $17,824 and $11,125, respectively	603,054	541,423
Unbilled accounts receivable	42,122	27,072
Deferred costs	17,097	6,888
Prepaid expenses and other current assets	41,880	75,778
Inventories and supplies	155,301	171,441
Deferred tax assets	21,898	22,577
Total current assets	1,141,774	1,086,793
Property, plant and equipment, net	1,615,427	1,531,763
Other assets:
Long-term investments	4,352	4,354
Deferred financing costs	21,565	21,657
Goodwill	590,152	593,771
Permits and other intangibles, net	567,776	572,817
Other	15,806	14,651
Total other assets	1,199,651	1,207,250
Total assets	3,956,852	3,825,806
Current liabilities:
Current portion of capital lease obligations	1,973	5,092
Accounts payable	321,097	256,468
Deferred revenue	61,912	50,942
Accrued expenses	256,813	232,429
Current portion of closure, post-closure and remedial liabilities	27,737	24,121
Total current liabilities	669,532	569,052
Other liabilities:
Closure and post-closure liabilities, less current portion of $7,512 and $8,791, respectively	39,982	45,457
Remedial liabilities, less current portion of $20,225 and $15,330, respectively	151,866	151,890
Long-term obligations	1,400,000	1,400,000
Capital lease obligations, less current portion	1,669	2,879
Deferred taxes, unrecognized tax benefits and other long-term liabilities	217,683	224,456
Total other liabilities	1,811,200	1,824,682
Common stock, $.01 par value:
Authorized 80,000,000; shares issued and outstanding 60,612,702 and 60,385,453 shares, respectively	606	604
Shares held under employee participation plan	(469)	(469)
Additional paid-in capital	893,822	880,979
Accumulated other comprehensive income	12,070	49,632
Accumulated earnings	570,091	501,326
Total stockholders’ equity	1,476,120	1,432,072
Total liabilities and stockholders’ equity	$ 3,956,852	$ 3,825,806

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INVENTORIES AND SUPPLIES (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Inventory Disclosure [Abstract]
Oil and oil products	$ 63,450	$ 77,735
Supplies and drums	61,888	63,540
Solvent and solutions	11,508	9,398
Other	18,455	20,768
Total inventories and supplies	$ 155,301	$ 171,441

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BUSINESS COMBINATIONS (Tables)

9 Months Ended

Sep. 30, 2013

Safety-Kleen [Member]

Business Acquisition [Line Items]

Summary of recognized amounts of identifiable assets acquired and liabilities assumed

The following table summarizes the recognized amounts of identifiable assets acquired and liabilities assumed (in thousands).

	Preliminary Allocations			Year-to-Date Measurement Period Adjustments			Current Estimate of Allocations
Inventories and supplies	$	102,339		$	5,037		$	107,376
Other current assets (i)	152,245			319			152,564
Property, plant and equipment	514,712			779			515,491
Permits and other intangibles	421,400			4,577			425,977
Other assets	4,985			(1,111		)	3,874
Current liabilities	(192,652		)	(5,081		)	(197,733		)
Closure and post-closure liabilities, less current portion	(15,774		)	8,221			(7,553		)
Remedial liabilities, less current portion	(38,370		)	(10,577		)	(48,947		)
Deferred taxes, unrecognized tax benefits and other long-term liabilities	(128,375		)	7,178			(121,197		)
Total identifiable net assets	820,510			9,342			829,852
Goodwill (ii)	436,749			(3,317		)	433,432
Total	$	1,257,259		$	6,025		$	1,263,284

_______________________

(i) The fair value of the assets acquired includes customer receivables with a preliminary aggregate fair value of $133.7 million. Combined gross amounts due were $143.7 million.

(ii) Goodwill represents the excess of the fair value of the net assets acquired over the purchase price. Goodwill of $214.1 million, $147.3 million, $69.9 million, and $2.1 million has been recorded on a preliminary basis in the Oil Re-refining and Recycling, SK Environmental Services, Industrial and Field Services and Technical Services segments, respectively. None of the goodwill related to this acquisition will be deductible for tax purposes.

Pro forma combined summary financial information

The following unaudited pro forma combined summary financial information presented below gives effect to the following transactions as if they had occurred as of January 1, 2011, and assumes that there were no material, non-recurring pro forma adjustments directly attributable to: (i) the acquisition of Safety-Kleen, (ii) the sale of 6.9 million shares of the Company's common stock, (iii) the issuance of $600.0 million aggregate principal amount of 5.125% senior unsecured notes due 2021, and (iv) the payment of related fees and expenses (in thousands):

	For the Three Months Ended		For the Nine Months Ended
	September 30, 2012		September 30, 2012
Pro forma combined revenues	$	851,376	$	2,691,025
Pro forma combined net income	$	13,480	$	90,546

Other 2012 Acquisitions [Member]

Business Acquisition [Line Items]

Summary of recognized amounts of identifiable assets acquired and liabilities assumed

(in thousands).

	Preliminary Allocations			Year-to-Date Measurement Period Adjustments			Final Allocations
Current assets (i)	$	20,270		$	117		$	20,387
Property, plant and equipment	51,901			(8		)	51,893
Customer relationships and other intangibles	21,770			(1		)	21,769
Other assets	53			4			57
Current liabilities	(5,277		)	(22		)	(5,299		)
Other liabilities	(5,133		)	(79		)	(5,212		)
Total identifiable net assets	83,584			11			83,595
Goodwill (ii)	23,956			1,308			25,264
Total	$	107,540		$	1,319		$	108,859

______________________

(i) The fair value of the financial assets acquired included customer receivables with an aggregate fair value of $13.2 million. Combined gross amounts due were $13.5 million.  

(ii) Goodwill represents the excess of the fair value of the net assets acquired over the purchase price attributed to expected operating and cross selling synergies. The goodwill has been assigned to the Industrial and Field Services segment and will not be deductible for tax purposes.

Pro forma combined summary financial information

The following unaudited pro forma combined financial data presents information as if the 2012 acquisitions had been acquired as of January 1, 2011 and assumes that there were no material, non-recurring pro forma adjustments directly attributable to those acquisitions. The pro forma financial information does not necessarily reflect the actual results that would have been reported had the Company and those three acquisitions been combined during the periods presented, nor is it necessarily indicative of the future results of operations of the combined companies (in thousands).

	For the Three Months Ended		For the Nine Months Ended
	September 30, 2012		September 30, 2012
Pro forma combined revenues	$	545,393	$	1,698,246
Pro forma combined net income	$	11,982	$	72,351

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ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME

9 Months Ended

Sep. 30, 2013

Equity [Abstract]

ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME

ACCUMULATED OTHER COMPREHENSIVE INCOME

Other comprehensive income (loss) includes translation adjustments of foreign currency financial statements, unrealized gains (losses) on available-for-sale securities and changes in unfunded pension liabilities. The components of other comprehensive income (loss) and related tax effects for the three and nine months ended September 30, 2013 and 2012 were as follows (in thousands):

	For the Three Months Ended							For the Three Months Ended
	September 30, 2013							September 30, 2012
	Gross		Tax Effect			Net of Tax		Gross		Tax Effect			Net of Tax
Foreign currency translation	$	20,731	$	—		$	20,731	$	29,086	$	—		$	29,086
Unrealized gain (loss) on available-for-sale securities	1,227		(153		)	1,074		1,040		(146		)	894
Other comprehensive income (loss)	$	21,958	$	(153	)	$	21,805	$	30,126	$	(146	)	$	29,980

	For the Nine Months Ended									For the Nine Months Ended
	September 30, 2013									September 30, 2012
	Gross			Tax Effect			Net of Tax			Gross		Tax Effect			Net of Tax
Foreign currency translation	$	(37,921	)	$	—		$	(37,921	)	$	27,393	$	—		$	27,393
Unrealized gain (loss) on available-for-sale securities	420			(61		)	359			373		(63		)	310
Other comprehensive income (loss)	$	(37,501	)	$	(61	)	$	(37,562	)	$	27,766	$	(63	)	$	27,703

The components of accumulated other comprehensive income, net of tax, were as follows (in thousands):

	Foreign Currency Translation			Unrealized Gain (Loss) on Available-For-Sale Securities		Unfunded Pension Liability			Total
Balance at January 1, 2013	$	50,627		$	660	$	(1,655	)	$	49,632
Other comprehensive loss, net of tax	(37,921		)	359		—			(37,562		)
Balance at September 30, 2013	$	12,706		$	1,019	$	(1,655	)	$	12,070

There were no reclassifications to net income from accumulated other comprehensive income during the three and nine months ended September 30, 2013.

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SIGNIFICANT ACCOUNTING POLICIES - Safety-Kleen Acquisition (Details) (Safety-Kleen [Member])	Dec. 28, 2012
Safety-Kleen [Member]
Business Acquisition [Line Items]
Outstanding common shares acquired (as a percent)	100.00%

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GOODWILL AND OTHER INTANGIBLE ASSETS (Amortizable Other Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Cost	$ 563,009	$ 543,439
Accumulated Amortization	110,738	86,142
Finite-Lived Intangible Assets, Net	452,271	457,297
Weighted Average Amortization Period (in years)	12 years 6 months	13 years 7 months 6 days
Intangible Assets, Gross (Excluding Goodwill)	678,514	658,959
Total permits and other intangible assets, Net	567,776	572,817
Trademarks and trade names
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Indefinite-Lived Intangible Assets (Excluding Goodwill)	115,505	115,520
Permits
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Cost	157,578	148,661
Accumulated Amortization	49,818	46,282
Finite-Lived Intangible Assets, Net	107,760	102,379
Weighted Average Amortization Period (in years)	18 years 9 months 18 days	21 years 9 months 18 days
Customer and supplier relationships
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Cost	377,334	372,751
Accumulated Amortization	46,372	27,739
Finite-Lived Intangible Assets, Net	330,962	345,012
Weighted Average Amortization Period (in years)	12 years 6 months	13 years 2 months 12 days
Other intangible assets
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Cost	28,097	22,027
Accumulated Amortization	14,548	12,121
Finite-Lived Intangible Assets, Net	$ 13,549	$ 9,906
Weighted Average Amortization Period (in years)	3 years 6 months	3 years 7 months 6 days

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COMMITMENTS AND CONTINGENCIES (Details)	9 Months Ended	12 Months Ended		9 Months Ended	12 Months Ended				9 Months Ended	1 Months Ended	9 Months Ended		12 Months Ended	9 Months Ended	12 Months Ended			9 Months Ended
	Sep. 30, 2013 USD ($)	Dec. 31, 2012 USD ($)	Sep. 30, 2013 Legal and Administrative Proceedings USD ($)	Sep. 30, 2013 Ville Mercier CAD Municipalities	Dec. 31, 1999 Ville Mercier Municipalities	Dec. 31, 1968 Ville Mercier Permits	Sep. 30, 2013 Ville Mercier USD ($)	Dec. 31, 2012 Ville Mercier USD ($)	Sep. 30, 2013 Product Liability Cases [Member] Safety-Kleen [Member] claims Lawsuits	Oct. 31, 2010 Fees Class Action Claims [Member] Safety-Kleen [Member] customer	Sep. 30, 2013 Superfund Proceedings USD ($) Sites	Sep. 30, 2013 Superfund Proceedings McKesson Corporation [Member] Sites	Dec. 26, 2012 Superfund Proceedings The Company [Member] Sites	Sep. 30, 2013 Superfund Proceedings Safety-Kleen [Member] Sites	Dec. 31, 2002 Wichita Property [Member] A	Sep. 30, 2013 Marine Shale Site [Member] USD ($)	Dec. 31, 2012 Marine Shale Site [Member] USD ($)	Sep. 30, 2013 Certain Other Third Party Sites [Member] Sites	Sep. 30, 2013 Certain Other Third Party Sites [Member] ChemWaste [Member] Sites	Sep. 30, 2013 Federal and State Enforcement Actions [Member] USD ($) Proceedings	Dec. 31, 2012 Federal and State Enforcement Actions [Member] Proceedings
Contingencies [Line Items]
Reserves relating to legal and administrative proceedings	$ 41,800,000	$ 38,600,000	$ 35,100,000																	$ 6,700,000
Possible increase in legal and administrative proceedings	3,400,000	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
Total number of municipalities filings separate legal proceedings				4
Damages claimed by municipalities				1,600,000
Suit against alleged past costs				17,400,000
Accrued remedial liabilities	172,091,000	167,220,000					13,900,000	14,200,000
Number of lawsuits filed										2
Third party sites arising out of acquisition of assets											35
Third party sites requiring expenditure on remediation											6
Number of pending personal injury claims allegedly resulting from the used of Safety-Kleen's products									62											5	4
Number of product liability claims settled or dismissed									26
Number of sites owned by third party excluded from cleanup or related liabilities											122
Number of sites owned by the entity subject to proceedings under federal or state superfund laws											2
Remaining reserves relating to listed third party sites																4,500,000	4,400,000
Indemnification agreement with third party sites												5						16	11
Notices received from owners of third party sites seeking indemnification from the company											120
Number of sites where potential liability could exceed the $100,000 threshold											12
Amount that a potential clean up liability could exceed											$ 100,000									$ 100,000
Number of sites owned by a third party where Company was notified it is a PRP or potential PRP													69	50
Number of sites for which environmental remediation expense is settled											13
Number of sites not currently requiring expenditures on remediation											16
Number of sites owned by third party excluded from cleanup or related liabilities											1
State-designated superfund site acquired, total acres															1,400

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ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME (Tables)

9 Months Ended

Sep. 30, 2013

Equity [Abstract]

Schedule of Comprehensive Income (Loss)

The components of other comprehensive income (loss) and related tax effects for the three and nine months ended September 30, 2013 and 2012 were as follows (in thousands):

	For the Three Months Ended							For the Three Months Ended
	September 30, 2013							September 30, 2012
	Gross		Tax Effect			Net of Tax		Gross		Tax Effect			Net of Tax
Foreign currency translation	$	20,731	$	—		$	20,731	$	29,086	$	—		$	29,086
Unrealized gain (loss) on available-for-sale securities	1,227		(153		)	1,074		1,040		(146		)	894
Other comprehensive income (loss)	$	21,958	$	(153	)	$	21,805	$	30,126	$	(146	)	$	29,980

	For the Nine Months Ended									For the Nine Months Ended
	September 30, 2013									September 30, 2012
	Gross			Tax Effect			Net of Tax			Gross		Tax Effect			Net of Tax
Foreign currency translation	$	(37,921	)	$	—		$	(37,921	)	$	27,393	$	—		$	27,393
Unrealized gain (loss) on available-for-sale securities	420			(61		)	359			373		(63		)	310
Other comprehensive income (loss)	$	(37,501	)	$	(61	)	$	(37,562	)	$	27,766	$	(63	)	$	27,703

Schedule of Accumulated Other Comprehensive Income (Loss)

The components of accumulated other comprehensive income, net of tax, were as follows (in thousands):

	Foreign Currency Translation			Unrealized Gain (Loss) on Available-For-Sale Securities		Unfunded Pension Liability			Total
Balance at January 1, 2013	$	50,627		$	660	$	(1,655	)	$	49,632
Other comprehensive loss, net of tax	(37,921		)	359		—			(37,562		)
Balance at September 30, 2013	$	12,706		$	1,019	$	(1,655	)	$	12,070

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CLOSURE AND POST-CLOSURE LIABILITIES (Tables)

9 Months Ended

Sep. 30, 2013

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 nine months ended September 30, 2013 were as follows (in thousands):

	Landfill Retirement Liability			Non-Landfill Retirement Liability			Total
Balance at January 1, 2013	$	26,658		$	27,590		$	54,248
Liabilities assumed in acquisitions	—			659			659
Adjustments during the measurement period related to acquisitions	—			(10,201		)	(10,201		)
New asset retirement obligations	3,321			—			3,321
Accretion	2,255			1,281			3,536
Changes in estimates recorded to statement of income	(398		)	99			(299		)
Changes in estimates recorded to balance sheet	299			—			299
Expenditures	(3,527		)	(310		)	(3,837		)
Currency translation and other	(152		)	(80		)	(232		)
Balance at September 30, 2013	$	28,456		$	19,038		$	47,494

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REMEDIAL LIABILITIES (Tables)

9 Months Ended

Sep. 30, 2013

Environmental Remediation Obligations [Abstract]

Changes to remedial liabilities

The changes to remedial liabilities for the nine months ended September 30, 2013 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, 2013	$	5,829		$	71,079		$	90,312		$	167,220
Liabilities assumed in acquisitions	—			—			2,384			$	2,384
Adjustments during the measurement period related to acquisitions	—			8,855			3,726			12,581
Accretion	210			2,505			2,377			5,092
Changes in estimates recorded to statement of income	(62		)	(2,341		)	285			(2,118		)
Expenditures	(67		)	(6,307		)	(5,717		)	(12,091		)
Currency translation and other	(108		)	(54		)	(815		)	(977		)
Balance at September 30, 2013	$	5,802		$	73,737		$	92,552		$	172,091

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FAIR VALUE MEASUREMENTS

9 Months Ended

Sep. 30, 2013

Fair Value Disclosures [Abstract]

FAIR VALUE MEASUREMENTS

FAIR VALUE MEASUREMENTS

The Company’s financial instruments consist of cash and cash equivalents, marketable securities, receivables, trade payables, auction rate securities, derivative financial instruments and long-term debt. The estimated fair value of cash equivalents, receivables, and trade payables approximate their carrying value due to the short maturity of these instruments and are deemed to be Level 2 in the fair value hierarchy. The fair value of the Company’s unsecured senior notes (due 2020 and 2021) at September 30, 2013 were $780.9 million and $573.1 million, respectively, and at December 31, 2012 were $816.0 million and $623.5 million, respectively, based on quoted market prices or available market data. The senior unsecured notes fair value is Level 2 in the fair value hierarchy.

The Company's assets measured at fair value on a recurring basis at September 30, 2013 and December 31, 2012 were as follows (in thousands):

September 30, 2013
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Balance at September 30, 2013
Assets:
Auction rate securities (i)	$	—	$	—	$	4,352	$	4,352
Derivative instruments (ii)	$	—	$	60	$	—	$	60
Marketable securities (iii)	$	11,787	$	—	$	—	$	11,787
Liabilities:
Derivative instruments (ii)	$	—	$	239	$	—	$	239

December 31, 2012
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Balance at December 31, 2012
Assets:
Auction rate securities (i)	$	—	$	—	$	4,354	$	4,354
Derivative instruments (ii)	$	—	$	165	$	—	$	165
Marketable securities (iii)	$	11,778	$	—	$	—	$	11,778
Liabilities:
Derivative instruments (ii)	$	—	$	1,242	$	—	$	1,242

________________________________________________

(i) The auction rate securities are classified as available-for-sale and the fair value of these securities was estimated utilizing a probability discounted cash flow analysis. As of September 30, 2013, all of the Company's auction rate securities continue to have AAA underlying ratings. The Company attributes the $0.3 million decline in the fair value of the securities from the original cost basis to external liquidity issues rather than credit issues. The Company assessed the decline in value to be temporary because it does not intend to sell and it is more likely than not that the Company will not have to sell the securities before their maturity. During the nine months ended September 30, 2013 and 2012, the Company recorded an unrealized pre-tax loss of less than $0.1 million and a pre-tax gain of $0.1 million, respectively, on its auction rate securities. 

(ii) The fair value of derivatives is recorded based on the present value of cash flows using a crude oil forward rate curve.

(iii) The fair value of marketable securities is recorded based on quoted market prices and changes in fair value were included in other comprehensive income.

The following table presents the changes in the Company’s auction rate securities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) during the three and nine months ended September 30, 2013 and 2012 (in thousands):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2013		2012		2013			2012
Balance at beginning of period	$	4,352	$	4,326	$	4,354		$	4,245
Unrealized (loss) gain included in other comprehensive income	—		—		(2		)	81
Balance at September 30,	$	4,352	$	4,326	$	4,352		$	4,326

Derivative Financial Instruments

The Company acquired several commodity derivatives with the Safety-Kleen acquisition on December 28, 2012. The Company uses commodity derivatives to manage against significant fluctuations in oil and oil derivative commodity prices and indices, specifically the ICIS-LOR rate and 6-oil index. All commodity derivatives are comprised of cashless collar contracts related to crude oil prices, pursuant to which the Company sells a call to a bank and then purchases a put from the same bank. The derivative instruments are not designated as hedges and expire in 2013 and 2014. The following table presents the fair value for those assets and liabilities measured at fair value as of September 30, 2013 (fair value amounts in thousands):

Financial Institution	Trade Date	Start Date	End Date	Barrels of oil per Month	Commodity	Floor		Cap		Upfront Costs	Fair Value as of September 30, 2013
Bank of America	2/7/2013	4/1/2014	4/30/2014	148,810	Brent	$	75.00	$	134.70	—	$	24
Bank of America	4/2/2013	6/1/2014	6/30/2014	148,810	Brent	75.00		130.00		—	21
Bank of America	9/11/2013	11/1/2014	11/28/2014	148,810	Brent	75.00		124.00		—	15
Total derivative instrument asset											$	60
JP Morgan	9/11/2012	11/1/2013	11/30/2013	148,810	Brent	$	75.00	$	137.50	—	$	3
JP Morgan	12/7/2012	2/1/2014	2/28/2014	148,810	Brent	75.00		124.70		—	33
JP Morgan	3/7/2013	5/1/2014	5/31/2014	148,810	Brent	75.00		125.75		—	10
JP Morgan	5/6/2013	7/1/2014	7/31/2014	148,810	Brent	75.00		122.00		—	37
JP Morgan	7/8/2013	9/1/2014	9/30/2014	148,810	Brent	75.00		120.75		—	39
Bank of America	8/3/2012	10/1/2013	10/31/2013	148,810	Brent	75.00		130.00		—	—
Bank of America	10/4/2012	12/1/2013	12/31/2013	148,810	Brent	75.00		127.50		—	14
Bank of America	11/9/2012	1/1/2014	1/31/2014	148,810	Brent	75.00		130.00		—	13
Bank of America	1/8/2013	3/1/2014	3/31/2014	148,810	Brent	75.00		129.00		—	10
Bank of America	6/10/2013	8/1/2014	8/29/2014	148,810	Brent	75.00		120.65		—	66
Bank of America	8/13/2013	10/1/2014	10/31/2014	148,810	Brent	75.00		122.60		—	14
Total derivative instrument liability											$	239

Total derivative instrument asset and total derivative instrument liability as noted in the table above are included in the consolidated balance sheets as a component of prepaid expenses and other current assets and accrued expenses, respectively.

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EARNINGS PER SHARE (Text) (Details) (Outstanding Stock Awards [Member]) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Outstanding Stock Awards [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from computation of earning per share (in shares)	173	66	173	66

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FAIR VALUE MEASUREMENTS (Tables)

9 Months Ended

Sep. 30, 2013

Fair Value Disclosures [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis

The Company's assets measured at fair value on a recurring basis at September 30, 2013 and December 31, 2012 were as follows (in thousands):

September 30, 2013
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Balance at September 30, 2013
Assets:
Auction rate securities (i)	$	—	$	—	$	4,352	$	4,352
Derivative instruments (ii)	$	—	$	60	$	—	$	60
Marketable securities (iii)	$	11,787	$	—	$	—	$	11,787
Liabilities:
Derivative instruments (ii)	$	—	$	239	$	—	$	239

December 31, 2012
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Balance at December 31, 2012
Assets:
Auction rate securities (i)	$	—	$	—	$	4,354	$	4,354
Derivative instruments (ii)	$	—	$	165	$	—	$	165
Marketable securities (iii)	$	11,778	$	—	$	—	$	11,778
Liabilities:
Derivative instruments (ii)	$	—	$	1,242	$	—	$	1,242

________________________________________________

(i) The auction rate securities are classified as available-for-sale and the fair value of these securities was estimated utilizing a probability discounted cash flow analysis. As of September 30, 2013, all of the Company's auction rate securities continue to have AAA underlying ratings. The Company attributes the $0.3 million decline in the fair value of the securities from the original cost basis to external liquidity issues rather than credit issues. The Company assessed the decline in value to be temporary because it does not intend to sell and it is more likely than not that the Company will not have to sell the securities before their maturity. During the nine months ended September 30, 2013 and 2012, the Company recorded an unrealized pre-tax loss of less than $0.1 million and a pre-tax gain of $0.1 million, respectively, on its auction rate securities. 

(ii) The fair value of derivatives is recorded based on the present value of cash flows using a crude oil forward rate curve.

(iii) The fair value of marketable securities is recorded based on quoted market prices and changes in fair value were included in other comprehensive income.

Changes in auction rate securities measured at fair value on a recurring basis

The following table presents the changes in the Company’s auction rate securities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) during the three and nine months ended September 30, 2013 and 2012 (in thousands):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2013		2012		2013			2012
Balance at beginning of period	$	4,352	$	4,326	$	4,354		$	4,245
Unrealized (loss) gain included in other comprehensive income	—		—		(2		)	81
Balance at September 30,	$	4,352	$	4,326	$	4,352		$	4,326

Schedule of Derivative Instruments

The following table presents the fair value for those assets and liabilities measured at fair value as of September 30, 2013 (fair value amounts in thousands):

Financial Institution	Trade Date	Start Date	End Date	Barrels of oil per Month	Commodity	Floor		Cap		Upfront Costs	Fair Value as of September 30, 2013
Bank of America	2/7/2013	4/1/2014	4/30/2014	148,810	Brent	$	75.00	$	134.70	—	$	24
Bank of America	4/2/2013	6/1/2014	6/30/2014	148,810	Brent	75.00		130.00		—	21
Bank of America	9/11/2013	11/1/2014	11/28/2014	148,810	Brent	75.00		124.00		—	15
Total derivative instrument asset											$	60
JP Morgan	9/11/2012	11/1/2013	11/30/2013	148,810	Brent	$	75.00	$	137.50	—	$	3
JP Morgan	12/7/2012	2/1/2014	2/28/2014	148,810	Brent	75.00		124.70		—	33
JP Morgan	3/7/2013	5/1/2014	5/31/2014	148,810	Brent	75.00		125.75		—	10
JP Morgan	5/6/2013	7/1/2014	7/31/2014	148,810	Brent	75.00		122.00		—	37
JP Morgan	7/8/2013	9/1/2014	9/30/2014	148,810	Brent	75.00		120.75		—	39
Bank of America	8/3/2012	10/1/2013	10/31/2013	148,810	Brent	75.00		130.00		—	—
Bank of America	10/4/2012	12/1/2013	12/31/2013	148,810	Brent	75.00		127.50		—	14
Bank of America	11/9/2012	1/1/2014	1/31/2014	148,810	Brent	75.00		130.00		—	13
Bank of America	1/8/2013	3/1/2014	3/31/2014	148,810	Brent	75.00		129.00		—	10
Bank of America	6/10/2013	8/1/2014	8/29/2014	148,810	Brent	75.00		120.65		—	66
Bank of America	8/13/2013	10/1/2014	10/31/2014	148,810	Brent	75.00		122.60		—	14
Total derivative instrument liability											$	239

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GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION (Tables)

9 Months Ended

Sep. 30, 2013

Guarantor and Non-Guarantor Subsidiaries Financial Information [Abstract]

Schedule of condensed consolidating balance sheet

Following is the condensed consolidating balance sheet at September 30, 2013 (in thousands):

	Clean Harbors, Inc.		U.S. Guarantor Subsidiaries		Foreign Non-Guarantor Subsidiaries		Consolidating Adjustments			Total
Assets:
Cash and cash equivalents	$	1,006	$	187,926	$	59,703	$	—		$	248,635
Intercompany receivables	336,356		2,369		174,609		(513,334		)	—
Other current assets	12,144		589,065		291,930		—			893,139
Property, plant and equipment, net	—		942,331		673,096		—			1,615,427
Investments in subsidiaries	2,601,246		929,111		144,953		(3,675,310		)	—
Intercompany debt receivable	—		508,524		3,701		(512,225		)	—
Other long-term assets	20,842		900,617		278,192		—			1,199,651
Total assets	$	2,971,594	$	4,059,943	$	1,626,184	$	(4,700,869	)	$	3,956,852
Liabilities and Stockholders’ Equity:
Current liabilities	$	40,600	$	472,178	$	156,754	$	—		$	669,532
Intercompany payables	—		510,906		2,428		(513,334		)	—
Closure, post-closure and remedial liabilities, net	—		158,366		33,482		—			191,848
Long-term obligations	1,400,000		—		—		—			1,400,000
Capital lease obligations, net	—		231		1,438		—			1,669
Intercompany debt payable	3,701		—		508,524		(512,225		)	—
Other long-term liabilities	51,173		124,441		42,069		—			217,683
Total liabilities	1,495,474		1,266,122		744,695		(1,025,559		)	2,480,732
Stockholders’ equity	1,476,120		2,793,821		881,489		(3,675,310		)	1,476,120
Total liabilities and stockholders’ equity	$	2,971,594	$	4,059,943	$	1,626,184	$	(4,700,869	)	$	3,956,852

Following is the condensed consolidating balance sheet at December 31, 2012 (in thousands):

	Clean Harbors, Inc.		U.S. Guarantor Subsidiaries		Foreign Non-Guarantor Subsidiaries		Consolidating Adjustments			Total
Assets:
Cash and cash equivalents	$	35,214	$	140,683	$	53,939	$	—		$	229,836
Intercompany receivables	296,023		17,704		116,571		(430,298		)	—
Other current assets	38,295		526,354		292,308		—			856,957
Property, plant and equipment, net	—		886,032		645,731		—			1,531,763
Investments in subsidiaries	2,528,699		850,011		144,953		(3,523,663		)	—
Intercompany debt receivable	—		508,067		3,701		(511,768		)	—
Other long-term assets	21,141		896,991		289,118		—			1,207,250
Total assets	$	2,919,372	$	3,825,842	$	1,546,321	$	(4,465,729	)	$	3,825,806
Liabilities and Stockholders’ Equity:
Current liabilities	$	32,586	$	402,990	$	133,476	$	—		$	569,052
Intercompany payables	—		412,594		17,704		(430,298		)	—
Closure, post-closure and remedial liabilities, net	—		161,175		36,172		—			197,347
Long-term obligations	1,400,000		—		—		—			1,400,000
Capital lease obligations, net	—		301		2,578		—			2,879
Intercompany debt payable	3,701		—		508,067		(511,768		)	—
Other long-term liabilities	51,013		134,393		39,050		—			224,456
Total liabilities	1,487,300		1,111,453		737,047		(942,066		)	2,393,734
Stockholders’ equity	1,432,072		2,714,389		809,274		(3,523,663		)	1,432,072
Total liabilities and stockholders’ equity	$	2,919,372	$	3,825,842	$	1,546,321	$	(4,465,729	)	$	3,825,806

Schedule of consolidating statement of income

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

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues
Service revenues	$	—		$	445,165		$	256,812		$	56		$	702,033
Product revenues	—			169,743			35,815			(56		)	205,502
Total revenues	—			614,908			292,627			—			907,535
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	—			300,859			177,519			56			478,434
Product cost of revenues	—			139,683			29,058			(56		)	168,685
Total cost of revenues	—			440,542			206,577			—			647,119
Selling, general and administrative expenses	29			81,496			32,939			—			114,464
Accretion of environmental liabilities	—			2,478			436			—			2,914
Depreciation and amortization	—			45,533			23,897			—			69,430
Income from operations	(29		)	44,859			28,778			—			73,608
Other expense	—			(111		)	(39		)	—			(150		)
Interest (expense) income	(19,844		)	137			381			—			(19,326		)
Equity in earnings of subsidiaries	58,919			21,064			—			(79,983		)	—
Intercompany dividend income (expense)	—			—			3,063			(3,063		)	—
Intercompany interest income (expense)	—			10,107			(10,107		)	—			—
Income before provision for income taxes	39,046			76,056			22,076			(83,046		)	54,132
Provision for income taxes	3,685			8,218			6,868			—			18,771
Net income	35,361			67,838			15,208			(83,046		)	35,361
Other comprehensive (loss) income	21,805			21,805			(10,072		)	(11,733		)	21,805
Comprehensive (loss) income	$	57,166		$	89,643		$	5,136		$	(94,779	)	$	57,166

Following is the consolidating statement of income (loss) for the three months ended September 30, 2012 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues
Service revenues	$	—		$	290,295		$	218,304		$	(4,871	)	$	503,728
Product revenues	—			24,527			5,678			(127		)	30,078
Total revenues	—			314,822			223,982			(4,998		)	533,806
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	—			198,793			154,836			(4,871		)	348,758
Product cost of revenues	—			19,904			4,405			(127		)	24,182
Total cost of revenues	—			218,697			159,241			(4,998		)	372,940
Selling, general and administrative expenses	9			35,810			24,520			—			60,339
Accretion of environmental liabilities	—			2,150			338			—			2,488
Depreciation and amortization	—			20,778			20,522			—			41,300
Income from operations	(9		)	37,387			19,361			—			56,739
Other (expense) income	—			(8		)	(83		)	—			(91		)
Loss on early extinguishment of debt	(26,385		)	—			—			—			(26,385		)
Interest expense	(11,247		)	180			(529		)	—			(11,596		)
Equity in earnings of subsidiaries	50,039			15,869			—			(65,908		)	—
Intercompany dividend income (expense)	—			—			3,439			(3,439		)	—
Intercompany interest income (expense)	—			10,290			(10,290		)	—			—
Income before provision for income taxes	12,398			63,718			11,898			(69,347		)	18,667
Provision for income taxes	39			3,831			2,438			—			6,308
Net income	12,359			59,887			9,460			(69,347		)	12,359
Other comprehensive income (loss)	29,980			29,980			13,042			(43,022		)	29,980
Comprehensive income (loss)	$	42,339		$	89,867		$	22,502		$	(112,369	)	$	42,339

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

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues
Service revenues	$	—		$	1,295,525		$	755,856		$	(2,854	)	$	2,048,527
Product revenues	—			463,301			119,267			(869		)	581,699
Total revenues	—			1,758,826			875,123			(3,723		)	2,630,226
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	—			873,945			531,318			(2,854		)	1,402,409
Product cost of revenues	—			395,891			100,038			(869		)	495,060
Total cost of revenues	—			1,269,836			631,356			(3,723		)	1,897,469
Selling, general and administrative expenses	84			266,941			98,521			—			365,546
Accretion of environmental liabilities	—			7,315			1,313			—			8,628
Depreciation and amortization	—			127,042			69,862			—			196,904
Income from operations	(84		)	87,692			74,071			—			161,679
Other income (expense)	—			2,858			(828		)	—			2,030
Interest (expense) income	(59,408		)	137			487			—			(58,784		)
Equity in earnings of subsidiaries	134,246			57,040			—			(191,286		)	—
Intercompany dividend income (expense)	—			—			10,031			(10,031		)	—
Intercompany interest income (expense)	—			30,414			(30,414		)	—			—
Income before provision for income taxes	74,754			178,141			53,347			(201,317		)	104,925
Provision for income taxes	5,989			14,753			15,418			—			36,160
Net income	68,765			163,388			37,929			(201,317		)	68,765
Other comprehensive (loss) income	(37,562		)	(37,562		)	20,385			17,177			(37,562		)
Comprehensive (loss) income	$	31,203		$	125,826		$	58,314		$	(184,140	)	$	31,203

Following is the consolidating statement of income (loss) for the nine months ended September 30, 2012 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues
Service revenues	$	—		$	850,737		$	687,924		$	(14,894	)	$	1,523,767
Product revenues	—			69,364			36,608			(793		)	105,179
Total revenues	—			920,101			724,532			(15,687		)	1,628,946
Cost of revenues (exclusive of items shown separately below)
Service cost of revenues	—			575,006			496,062			(14,894		)	1,056,174
Product cost of revenues	—			55,646			29,851			(793		)	84,704
Total cost of revenues	—			630,652			525,913			(15,687		)	1,140,878
Selling, general and administrative expenses	27			122,167			75,698			—			197,892
Accretion of environmental liabilities	—			6,430			979			—			7,409
Depreciation and amortization	—			56,568			60,226			—			116,794
Income from operations	(27		)	104,284			61,716			—			165,973
Other (expense) income	—			(333		)	(132		)	—			(465		)
Loss on early extinguishment of debt	(26,385		)	—			—			—			(26,385		)
Interest expense	(32,679		)	—			(1,157		)	—			(33,836		)
Equity in earnings of subsidiaries	124,965			49,236			—			(174,201		)	—
Intercompany dividend income (expense)	10,010			—			10,354			(20,364		)	—
Intercompany interest income (expense)	—			30,894			(30,894		)	—			—
Income before provision for income taxes	75,884			184,081			39,887			(194,565		)	105,287
Provision for income taxes	8,084			19,473			9,930			—			37,487
Net income	67,800			164,608			29,957			(194,565		)	67,800
Other comprehensive income (loss)	27,703			27,703			11,370			(39,073		)	27,703
Comprehensive income (loss)	$	95,503		$	192,311		$	41,327		$	(233,638	)	$	95,503

Schedule of condensed consolidating statement of cash flows

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

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Total
Net cash from operating activities	$	(38,228	)	$	176,844		$	141,498		$	280,114
Cash flows from investing activities:
Additions to property, plant and equipment	—			(101,813		)	(105,828		)	(207,641		)
Proceeds from sales of fixed assets	—			819			2,881			3,700
Acquisitions, net of cash acquired	—			(59,458		)	—			(59,458		)
Costs to obtain or renew permits	—			(221		)	(4,136		)	(4,357		)
Other	—			—			(11		)	(11		)
Net cash from investing activities	—			(160,673		)	(107,094		)	(267,767		)
Cash flows from financing activities:
Change in uncashed checks	—			9,427			327			9,754
Proceeds from exercise of stock options	399			—			—			399
Proceeds from employee stock purchase plan	5,327			—			—			5,327
Remittance of shares, net	(599		)	—			—			(599		)
Excess tax benefit of stock-based compensation	1,589			—			—			1,589
Deferred financing costs paid	(2,446		)	—			—			(2,446		)
Payments on capital leases	—			(178		)	(3,918		)	(4,096		)
Issuance costs related to 2012 issuance of common stock	(250		)							(250		)
Dividends (paid) / received	—			(10,284		)	10,284			—
Interest (payments) / received	—			32,107			(32,107		)	—
Net cash from financing activities	4,020			31,072			(25,414		)	9,678
Effect of exchange rate change on cash	—			—			(3,226		)	(3,226		)
(Decrease) increase in cash and cash equivalents	(34,208		)	47,243			5,764			18,799
Cash and cash equivalents, beginning of period	35,214			140,683			53,939			229,836
Cash and cash equivalents, end of period	$	1,006		$	187,926		$	59,703		$	248,635

Following is the condensed consolidating statement of cash flows for the nine months ended September 30, 2012 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Total
Net cash from operating activities	$	(49,918	)	$	98,497		$	184,113		$	232,692
Cash flows from investing activities:
Additions to property, plant and equipment	—			(75,664		)	(54,662		)	(130,326		)
Proceeds from sale of fixed assets	—			3,411			779			4,190
Acquisitions, net of cash acquired	—			(51,424		)	(41,051		)	(92,475		)
Costs to obtain or renew permits	—			(625		)	(1,784		)	(2,409		)
Purchase of available for sale securities	—			—			(10,517		)	(10,517		)
Other				603			4,517			5,120
Net cash from investing activities	—			(123,699		)	(102,718		)	(226,417		)
Cash flows from financing activities:
Change in uncashed checks	—			(7,771		)	(6,184		)	(13,955		)
Proceeds from exercise of stock options	231			—			—			231
Proceeds from employee stock purchase plan	4,627			—			—			4,627
Remittance of shares, net	(1,604		)	—			—			(1,604		)
Excess tax benefit of stock-based compensation	1,786			—			—			1,786
Deferred financing costs paid	(9,638		)	—			—			(9,638		)
Payments of capital leases	—			(781		)	(4,522		)	(5,303		)
Distribution of cash earned on employee participation plan	(55		)	—			—			(55		)
Principal payment on debt	$	(520,000	)	$	—		$	—		(520,000		)
Issuance of senior unsecured notes	800,000			—			—			800,000
Dividends (paid) / received	10,010			(23,669		)	13,659			—
Interest (payments) / received	—			43,954			(43,954		)	—
Net cash from financing activities	285,357			11,733			(41,001		)	256,089
Effect of exchange rate change on cash	—			—			527			527
Increase (decrease) in cash and cash equivalents	235,439			(13,469		)	40,921			262,891
Cash and cash equivalents, beginning of period	91,581			128,071			41,071			260,723
Cash and cash equivalents, end of period	$	327,020		$	114,602		$	81,992		$	523,614

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GOODWILL AND OTHER INTANGIBLE ASSETS

9 Months Ended

Sep. 30, 2013

Goodwill and Intangible Assets Disclosure [Abstract]

GOODWILL AND OTHER INTANGIBLE ASSETS

GOODWILL AND OTHER INTANGIBLE ASSETS

The changes to goodwill for the nine months ended September 30, 2013 were as follows (in thousands):

	2013
Balance at January 1, 2013	$	593,771
Acquired from acquisitions	3,179
Decrease from adjustments during the measurement period related to acquisitions	(2,009		)
Foreign currency translation	(4,789		)
Balance at September 30, 2013	$	590,152

The goodwill related to the acquisition of Safety-Kleen in 2012 and Evergreen in 2013 includes estimates that are subject to change based upon final fair value determinations.     

The Company assesses goodwill for impairment at least on an annual basis as of December 31, or when events or changes in the business environment indicate that the carrying value of the reporting unit may exceed its fair value, by comparing the fair value of each reporting unit to its carrying value, including goodwill.

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

	September 30, 2013							December 31, 2012
	Cost		Accumulated Amortization		Net		Weighted Average Remaining Amortization Period (in years)	Cost		Accumulated Amortization		Net		Weighted Average Remaining Amortization Period (in years)
Permits	$	157,578	$	49,818	$	107,760	18.8	$	148,661	$	46,282	$	102,379	21.8
Customer and supplier relationships	377,334		46,372		330,962		12.5	372,751		27,739		345,012		13.2
Other intangible assets	28,097		14,548		13,549		3.5	22,027		12,121		9,906		3.6
Total amortizable permits and other intangible assets	563,009		110,738		452,271		12.5	543,439		86,142		457,297		13.6
Trademarks and trade names	115,505		—		115,505		Indefinite	115,520		—		115,520		Indefinite
Total permits and other intangible assets	$	678,514	$	110,738	$	567,776		$	658,959	$	86,142	$	572,817

Below is the expected future amortization of the net carrying amount of finite lived intangible assets at September 30, 2013 (in thousands):

Years Ending December 31,	Expected Amortization
2013 (three months)	$	10,816
2014	42,308
2015	40,704
2016	39,210
2017	36,528
Thereafter	282,705
	$	452,271

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BUSINESS COMBINATIONS

9 Months Ended

Sep. 30, 2013

Business Combinations [Abstract]

BUSINESS COMBINATIONS

BUSINESS COMBINATIONS

Evergreen Oil, Inc.

On September 13, 2013, Safety-Kleen, Inc. acquired 100% of the outstanding common shares of Evergreen Oil, Inc. (“Evergreen”) for approximately $57.0 million. The purchase price consisted of an all-cash purchase price of $60.5 million, less a $3.5 million adjustment for the amount by which the estimated net working capital (as defined in the stock purchase agreement) of Evergreen on the closing date was less than $1.0 million. The purchase price is subject to adjustment upon finalization of Evergreen’s net working capital balance as of the closing date. Goodwill of $2.8 million and $0.4 million has been recorded on a preliminary basis in the Oil Re-refining and Recycling and SK Environmental Services segments, respectively, and will not be deductible for tax purposes. Evergreen, headquartered in Irvine, California, specializes in the recovery and re-refining of used oil and is currently the second-largest collector of used oil in California. 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 Company believes Evergreen is a good strategic fit, enabling Clean Harbors to further (i) penetrate the small quantity waste generator market, (ii) expand its oil re-refining, oil recycling and waste treatment capabilities, (iii) increase the waste volumes into its existing waste disposal treatment network, (v) enhance its commitment to sustainability, (vi) leverage the combined sales forces to maximize cross-selling opportunities, and (viii) leverage operating efficiencies through the combined company.

Safety-Kleen, Inc.

On December 28, 2012, the Company acquired 100% of the outstanding common shares of Safety-Kleen for approximately $1.3 billion. The purchase price consisted of an all-cash purchase price of $1.25 billion, plus a $13.3 million adjustment for the amount by which the net working capital (excluding cash) of Safety-Kleen on the closing date exceeded $50.0 million. The Company incurred acquisition-related costs of approximately $0.9 million and $2.2 million in connection with the transaction which are included in selling, general and administrative expenses in the consolidated statements of income for the three and nine months ended September 30, 2013, respectively. The Company financed the purchase through a combination of approximately $300.0 million of existing cash, $369.3 million in net proceeds from the Company's public offering of 6.9 million shares of Clean Harbors common stock, and approximately $589.0 million in net proceeds from the Company's private debt offering of $600.0 million of 5.125% senior unsecured notes due 2021. Safety-Kleen, headquartered in Richardson, Texas, is the largest re-refiner and recycler of used oil in North America and a leading provider of parts cleaning and environmental services to commercial, industrial and automotive customers. In conjunction with the transaction, Safety-Kleen, Inc. and its subsidiaries became wholly-owned subsidiaries of Clean Harbors.

The fair value of all the acquired identifiable assets and liabilities summarized below is provisional pending finalization of the Company's acquisition accounting. Measurement period adjustments reflect new information obtained about facts and circumstances that existed as of the acquisition date. The Company believes that such preliminary allocations provide a reasonable basis for estimating the fair values of assets acquired and liabilities assumed, but the Company is waiting for additional information necessary to finalize fair value. The Company expects to finalize the valuation and complete the purchase price allocation as soon as practicable but no later than one year from the acquisition date. As the measurement period adjustments are not material to the consolidated balance sheets as of December 31, 2012 nor are they material to the amounts reported in the consolidated statements of income and consolidated statement of cash flows for the three and nine months ended September 30, 2013, the adjustments have been recorded on a prospective basis. Final determination of the fair value may result in further adjustments to the values presented below. The following table summarizes the recognized amounts of identifiable assets acquired and liabilities assumed (in thousands).

	Preliminary Allocations			Year-to-Date Measurement Period Adjustments			Current Estimate of Allocations
Inventories and supplies	$	102,339		$	5,037		$	107,376
Other current assets (i)	152,245			319			152,564
Property, plant and equipment	514,712			779			515,491
Permits and other intangibles	421,400			4,577			425,977
Other assets	4,985			(1,111		)	3,874
Current liabilities	(192,652		)	(5,081		)	(197,733		)
Closure and post-closure liabilities, less current portion	(15,774		)	8,221			(7,553		)
Remedial liabilities, less current portion	(38,370		)	(10,577		)	(48,947		)
Deferred taxes, unrecognized tax benefits and other long-term liabilities	(128,375		)	7,178			(121,197		)
Total identifiable net assets	820,510			9,342			829,852
Goodwill (ii)	436,749			(3,317		)	433,432
Total	$	1,257,259		$	6,025		$	1,263,284

_______________________

(i) The fair value of the assets acquired includes customer receivables with a preliminary aggregate fair value of $133.7 million. Combined gross amounts due were $143.7 million.

(ii) Goodwill represents the excess of the fair value of the net assets acquired over the purchase price. Goodwill of $214.1 million, $147.3 million, $69.9 million, and $2.1 million has been recorded on a preliminary basis in the Oil Re-refining and Recycling, SK Environmental Services, Industrial and Field Services and Technical Services segments, respectively. None of the goodwill related to this acquisition will be deductible for tax purposes.    

The Company has determined that the separate disclosure of Safety-Kleen's revenues and earnings is impracticable for the three and nine months ended September 30, 2013 due to the integration of Safety-Kleen's operations into the Company upon acquisition.

The following unaudited pro forma combined summary financial information presented below gives effect to the following transactions as if they had occurred as of January 1, 2011, and assumes that there were no material, non-recurring pro forma adjustments directly attributable to: (i) the acquisition of Safety-Kleen, (ii) the sale of 6.9 million shares of the Company's common stock, (iii) the issuance of $600.0 million aggregate principal amount of 5.125% senior unsecured notes due 2021, and (iv) the payment of related fees and expenses (in thousands):

	For the Three Months Ended		For the Nine Months Ended
	September 30, 2012		September 30, 2012
Pro forma combined revenues	$	851,376	$	2,691,025
Pro forma combined net income	$	13,480	$	90,546

This pro forma financial information is not necessarily indicative of the Company's consolidated operating results that would have been reported had the transactions been completed as described herein, nor is such information necessarily indicative of the Company's consolidated results for any future period.

Other 2012 Acquisitions

The Company acquired (i) during the second quarter of 2012, all of the outstanding stock of a privately owned Canadian company which provides workforce accommodations, camp catering and fresh food services; (ii) during the third quarter of 2012, certain assets of a privately owned U.S. company that is engaged in the business of materials handling services that includes a variety of support equipment to provide customers with a sole source for any dredging and dewatering project; and (iii) during the fourth quarter of 2012, the shares and assets of certain subsidiaries of a privately owned company that is engaged in the business of providing catalyst loading and unloading services in the United States and Canada. The combined purchase price for these acquisitions was approximately $108.9 million, including the assumption and payment of debt of $7.7 million and post-closing adjustments of $2.1 million based upon finalization of the working capital balances as of the closing date. Management has 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 September 30, 2013, the Company had finalized the acquisition accounting of the identified acquired assets and liabilities for the other 2012 acquisitions, the impact of which was not material to the financial statements. The following table summarizes the recognized amounts of identifiable assets acquired and liabilities assumed (in thousands).

	Preliminary Allocations			Year-to-Date Measurement Period Adjustments			Final Allocations
Current assets (i)	$	20,270		$	117		$	20,387
Property, plant and equipment	51,901			(8		)	51,893
Customer relationships and other intangibles	21,770			(1		)	21,769
Other assets	53			4			57
Current liabilities	(5,277		)	(22		)	(5,299		)
Other liabilities	(5,133		)	(79		)	(5,212		)
Total identifiable net assets	83,584			11			83,595
Goodwill (ii)	23,956			1,308			25,264
Total	$	107,540		$	1,319		$	108,859

______________________

(i) The fair value of the financial assets acquired included customer receivables with an aggregate fair value of $13.2 million. Combined gross amounts due were $13.5 million.  

(ii) Goodwill represents the excess of the fair value of the net assets acquired over the purchase price attributed to expected operating and cross selling synergies. The goodwill has been assigned to the Industrial and Field Services segment and will not be deductible for tax purposes.

The following unaudited pro forma combined financial data presents information as if the 2012 acquisitions had been acquired as of January 1, 2011 and assumes that there were no material, non-recurring pro forma adjustments directly attributable to those acquisitions. The pro forma financial information does not necessarily reflect the actual results that would have been reported had the Company and those three acquisitions been combined during the periods presented, nor is it necessarily indicative of the future results of operations of the combined companies (in thousands).

	For the Three Months Ended		For the Nine Months Ended
	September 30, 2012		September 30, 2012
Pro forma combined revenues	$	545,393	$	1,698,246
Pro forma combined net income	$	11,982	$	72,351

Acquisition-related costs of $0.2 million for the other 2012 acquisitions were included in selling, general and administrative expenses in the Company's consolidated statements of income for the nine months ended September 30, 2013.

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UNAUDITED CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Other Comprehensive Income [Abstract]
Change in fair value of available for sale securities, tax	$ 153	$ 146	$ 61	$ 63

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PROPERTY, PLANT, AND EQUIPMENT (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 2,383,056	$ 2,144,682
Less - accumulated depreciation and amortization	767,629	612,919
Total property, plant and equipment, net	1,615,427	1,531,763
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	100,133	106,037
Asset retirement costs (non-landfill)
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	10,748	10,450
Landfill assets
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	93,104	77,952
Building and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	324,646	329,617
Camp equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	135,377	135,827
Vehicles
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	419,581	385,172
Equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,164,838	1,061,090
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	5,244	6,757
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 129,385	$ 31,780

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BUSINESS COMBINATIONS (Safety-Kleen) (Details) (Safety-Kleen [Member], USD $) Share data in Millions, unless otherwise specified	3 Months Ended		9 Months Ended			12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013		Sep. 30, 2012	Dec. 31, 2012	Dec. 28, 2012
Business Acquisition [Line Items]
Outstanding common shares acquired (as a percent)							100.00%
Combined purchase price							$ 1,300,000,000
Net working capital adjustment included in purchase price							13,300,000
Threshold for working capital adjustment							50,000,000
Acquisition-related costs	900,000		2,200,000
Existing cash used to finance the acquisition						300,000,000	1,250,000,000
Net proceeds from a public offering of shares used to finance the acquisition						369,300,000
Number of shares sold in the public offering						6.9
Net proceeds from a private debt offering used to finance the acquisition						589,000,000
Business Acquisition, Purchase Price Allocation [Abstract]
Inventories and supplies							107,376,000
Other current assets							152,564,000	[1]
Property, plant and equipment							515,491,000
Permits and other intangibles							425,977,000
Other assets							3,874,000
Current liabilities							(197,733,000)
Remedial liabilities, less current portion							(48,947,000)
Closure and post-closure liabilities, less current portion							(7,553,000)
Deferred taxes, unrecognized tax benefits and other long-term liabilities							(121,197,000)
Total identifiable net assets							829,852,000
Goodwill							433,432,000	[2]
Total							1,263,284,000
Inventories and supplies, Measurement Period Adjustment			5,037,000
Other current assets, Measurement Period Adjustment			319,000	[1]
Property, plant and equipment, Measurement Period Adjustment			779,000
Permits and other intangibles, Measurement Period Adjustment			4,577,000
Other assets, Measurement Period Adjustment			(1,111,000)
Current liabilities, Measurement Period Adjustment			(5,081,000)
Closure and post-closure liabilities, less current portion, Measurement Period Adjustments			8,221,000
Remedial liabilities, less current portion, Measurement Period Adjustments			(10,577,000)
Deferred taxes, unrecognized tax benefits and other long-term liabilities, Measurement Period Adjustments			7,178,000
Total identiiable net assets, Measurement Period Adjustments			9,342,000
Goodwill, Measurement Period Adjustments			(3,317,000)	[2]
Total, Measurement Period Adjustments			6,025,000
Preliminary fair value of customer receivables							133,700,000
Gross amounts of customer receivables							143,700,000
Business Acquisition, Pro Forma Information [Abstract]
Pro forma combined revenues		851,376,000			2,691,025,000
Pro forma combined net income		13,480,000			90,546,000
Unsecured Senior Notes 2021 [Member] | Senior Notes [Member]
Business Acquisition [Line Items]
Face amount of long-term debt issued in private offering						600,000,000
Stated interest rate						5.125%
Oil Re-Refining and Recycling [Member]
Business Acquisition, Purchase Price Allocation [Abstract]
Goodwill							214,100,000
S K Environmental Services [Member]
Business Acquisition, Purchase Price Allocation [Abstract]
Goodwill							147,300,000
Industrial and Field Services [Member]
Business Acquisition, Purchase Price Allocation [Abstract]
Goodwill							69,900,000
Technical Services [Member]
Business Acquisition, Purchase Price Allocation [Abstract]
Goodwill							2,100,000
Scenario, Previously Reported [Member]
Business Acquisition, Purchase Price Allocation [Abstract]
Inventories and supplies							102,339,000
Other current assets							152,245,000	[1]
Property, plant and equipment							514,712,000
Permits and other intangibles							421,400,000
Other assets							4,985,000
Current liabilities							(192,652,000)
Remedial liabilities, less current portion							(38,370,000)
Closure and post-closure liabilities, less current portion							(15,774,000)
Deferred taxes, unrecognized tax benefits and other long-term liabilities							(128,375,000)
Total identifiable net assets							820,510,000
Goodwill							436,749,000	[2]
Total							$ 1,257,259,000

[1] The fair value of the assets acquired includes customer receivables with a preliminary aggregate fair value of $133.7 million. Combined gross amounts due were $143.7 million.

[2] Goodwill represents the excess of the fair value of the net assets acquired over the purchase price. Goodwill of $214.1 million, $147.3 million, $69.9 million, and $2.1 million has been recorded on a preliminary basis in the Oil Re-refining and Recycling, SK Environmental Services, Industrial and Field Services and Technical Services segments, respectively. None of the goodwill related to this acquisition will be deductible for tax purposes.

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GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)

9 Months Ended

Sep. 30, 2013

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of changes to goodwill

The changes to goodwill for the nine months ended September 30, 2013 were as follows (in thousands):

	2013
Balance at January 1, 2013	$	593,771
Acquired from acquisitions	3,179
Decrease from adjustments during the measurement period related to acquisitions	(2,009		)
Foreign currency translation	(4,789		)
Balance at September 30, 2013	$	590,152

Summary of amortizable other intangible assets

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

	September 30, 2013							December 31, 2012
	Cost		Accumulated Amortization		Net		Weighted Average Remaining Amortization Period (in years)	Cost		Accumulated Amortization		Net		Weighted Average Remaining Amortization Period (in years)
Permits	$	157,578	$	49,818	$	107,760	18.8	$	148,661	$	46,282	$	102,379	21.8
Customer and supplier relationships	377,334		46,372		330,962		12.5	372,751		27,739		345,012		13.2
Other intangible assets	28,097		14,548		13,549		3.5	22,027		12,121		9,906		3.6
Total amortizable permits and other intangible assets	563,009		110,738		452,271		12.5	543,439		86,142		457,297		13.6
Trademarks and trade names	115,505		—		115,505		Indefinite	115,520		—		115,520		Indefinite
Total permits and other intangible assets	$	678,514	$	110,738	$	567,776		$	658,959	$	86,142	$	572,817

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 September 30, 2013 (in thousands):

Years Ending December 31,	Expected Amortization
2013 (three months)	$	10,816
2014	42,308
2015	40,704
2016	39,210
2017	36,528
Thereafter	282,705
	$	452,271

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SEGMENT REPORTING (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 segment	Sep. 30, 2012	Dec. 31, 2012
Segment reporting information
Number of reportable segments			5
Number of operations for which the revenues are insignificant			2
Third party revenues	$ 907,535	$ 533,806	$ 2,630,226	$ 1,628,946
Intersegment revenues, net
Corporate Items, net
Total revenues	907,535	533,806	2,630,226	1,628,946
Adjusted EBITDA, Total	145,952	100,527	380,770	290,176
Reconciliation to Consolidated Statements of Income:
Pre-tax, non-cash acquisition accounting adjustments	0	0	13,559	0
Accretion of environmental liabilities	2,914	2,488	8,628	7,409
Depreciation and amortization	69,430	41,300	196,904	116,794
Income from operations	73,608	56,739	161,679	165,973
Other (income) expense	150	91	(2,030)	465
Loss on early extinguishment of debt	0	26,385	0	26,385
Interest expense, net of interest income	19,326	11,596	58,784	33,836
Income before provision for income taxes	54,132	18,667	104,925	105,287
Property, plant and equipment, net	1,615,427		1,615,427		1,531,763
Goodwill	590,152		590,152		593,771
Permits and other intangibles, net	567,776		567,776		572,817
Total assets	3,956,852		3,956,852		3,825,806
United States
Reconciliation to Consolidated Statements of Income:
Total assets	2,665,328		2,665,328		2,564,609
Canada
Reconciliation to Consolidated Statements of Income:
Total assets	1,287,090		1,287,090		1,260,421
Other foreign
Reconciliation to Consolidated Statements of Income:
Total assets	4,434		4,434		776
Reportable Segment [Member]
Reconciliation to Consolidated Statements of Income:
Property, plant and equipment, net	1,615,427		1,615,427		1,531,763
Total Intangible assets	1,157,928		1,157,928		1,166,588
Total assets	3,956,852		3,956,852		3,825,806
Technical Services [Member]
Segment reporting information
Third party revenues	269,465	247,355	759,666	712,313
Intersegment revenues, net	35,406	6,951	85,614	24,235
Corporate Items, net	964	665	3,155	1,805
Total revenues	305,835	254,971	848,435	738,353
Adjusted EBITDA, Total	78,849	68,241	208,284	188,673
Reconciliation to Consolidated Statements of Income:
Property, plant and equipment, net	398,778		398,778		402,260
Goodwill	47,917		47,917		48,157
Permits and other intangibles, net	81,689		81,689		85,842
Total Intangible assets	129,606		129,606		133,999
Total assets	699,713		699,713		714,777
Oil Re-Refining and Recycling [Member]
Segment reporting information
Third party revenues	151,565	0	438,191	0
Intersegment revenues, net	(64,918)	0	(186,053)	0
Corporate Items, net	0	0	0	0
Total revenues	86,647	0	252,138	0
Adjusted EBITDA, Total	18,892	0	46,861	0
Reconciliation to Consolidated Statements of Income:
Property, plant and equipment, net	262,745		262,745		224,289
Goodwill	215,816		215,816		215,704
Permits and other intangibles, net	233,259		233,259		222,182
Total Intangible assets	449,075		449,075		437,886
Total assets	833,336		833,336		797,650
S K Environmental Services [Member]
Segment reporting information
Third party revenues	150,535	0	453,325	0
Intersegment revenues, net	36,516	0	126,441	0
Corporate Items, net	0	0	84	0
Total revenues	187,051	0	579,850	0
Adjusted EBITDA, Total	22,951	0	84,162	0
Reconciliation to Consolidated Statements of Income:
Property, plant and equipment, net	193,760		193,760		195,172
Goodwill	146,956		146,956		148,422
Permits and other intangibles, net	186,043		186,043		190,472
Total Intangible assets	332,999		332,999		338,894
Total assets	642,557		642,557		647,746
Industrial and Field Services [Member]
Segment reporting information
Third party revenues	227,754	203,371	693,667	608,768
Intersegment revenues, net	(7,322)	(8,877)	(32,316)	(31,246)
Corporate Items, net	73	100	184	48
Total revenues	220,505	194,594	661,535	577,570
Adjusted EBITDA, Total	48,096	43,278	138,638	117,914
Reconciliation to Consolidated Statements of Income:
Property, plant and equipment, net	410,776		410,776		371,335
Goodwill	140,927		140,927		141,726
Permits and other intangibles, net	36,854		36,854		41,143
Total Intangible assets	177,781		177,781		182,869
Total assets	645,183		645,183		607,654
Oil and Gas Field Services [Member]
Segment reporting information
Third party revenues	107,627	82,812	294,183	306,566
Intersegment revenues, net	318	1,926	6,314	7,011
Corporate Items, net	(114)	(98)	(314)	(391)
Total revenues	107,831	84,640	300,183	313,186
Adjusted EBITDA, Total	20,854	14,132	52,372	62,299
Reconciliation to Consolidated Statements of Income:
Property, plant and equipment, net	240,863		240,863		257,985
Goodwill	38,536		38,536		39,762
Permits and other intangibles, net	29,931		29,931		33,178
Total Intangible assets	68,467		68,467		72,940
Total assets	310,481		310,481		348,771
Corporate Items [Member]
Segment reporting information
Third party revenues	589	268	(8,806)	1,299
Intersegment revenues, net	0	0	0	0
Corporate Items, net	(923)	(667)	(3,109)	(1,462)
Total revenues	(334)	(399)	(11,915)	(163)
Adjusted EBITDA, Total	(43,690)	(25,124)	(149,547)	(78,710)
Reconciliation to Consolidated Statements of Income:
Pre-tax, non-cash acquisition accounting adjustments			10,200
Property, plant and equipment, net	108,505		108,505		80,722
Total assets	$ 825,582		$ 825,582		$ 709,208

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FINANCING ARRANGEMENTS (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013 Unsecured Debt [Member] Unsecured Senior Notes 2020 [Member]	Dec. 31, 2012 Unsecured Debt [Member] Unsecured Senior Notes 2020 [Member]	Sep. 30, 2013 Unsecured Debt [Member] Unsecured Senior Notes 2021 [Member]	Dec. 31, 2012 Unsecured Debt [Member] Unsecured Senior Notes 2021 [Member]	Jan. 17, 2013 Line of Credit [Member]	Jan. 17, 2013 Letter of Credit [Member]
Financing arrangements
Senior unsecured notes			$ 800,000,000	$ 800,000,000	$ 600,000,000	$ 600,000,000
Revolving credit facility due January 17, 2018	0	0
Long-term obligations	1,400,000,000	1,400,000,000
Revolving credit facility, maximum borrowing capacity							400,000,000.0	325,000,000
Line of credit facility available borrowing capacity	262,300,000
Letters of credit amount outstanding	137,700,000
Senior unsecured notes principal amount			$ 800,000,000		$ 600,000,000
Stated interest rate			5.25%		5.125%

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REMEDIAL LIABILITIES

9 Months Ended

Sep. 30, 2013

Environmental Remediation Obligations [Abstract]

REMEDIAL LIABILITIES

REMEDIAL LIABILITIES

The changes to remedial liabilities for the nine months ended September 30, 2013 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, 2013	$	5,829		$	71,079		$	90,312		$	167,220
Liabilities assumed in acquisitions	—			—			2,384			$	2,384
Adjustments during the measurement period related to acquisitions	—			8,855			3,726			12,581
Accretion	210			2,505			2,377			5,092
Changes in estimates recorded to statement of income	(62		)	(2,341		)	285			(2,118		)
Expenditures	(67		)	(6,307		)	(5,717		)	(12,091		)
Currency translation and other	(108		)	(54		)	(815		)	(977		)
Balance at September 30, 2013	$	5,802		$	73,737		$	92,552		$	172,091

The benefit resulting from changes in remedial liability estimates for inactive sites was primarily due to reevaluating and removing certain compensation costs related to one site as a result of recently receiving site closure approval.

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PROPERTY, PLANT, AND EQUIPMENT

9 Months Ended

Sep. 30, 2013

Property, Plant and Equipment [Abstract]

PROPERTY, PLANT AND EQUIPMENT

PROPERTY, PLANT AND EQUIPMENT

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

	September 30,		December 31,
	2013		2012
Land	$	100,133	$	106,037
Asset retirement costs (non-landfill)	10,748		10,450
Landfill assets	93,104		77,952
Buildings and improvements	324,646		329,617
Camp equipment	135,377		135,827
Vehicles	419,581		385,172
Equipment	1,164,838		1,061,090
Furniture and fixtures	5,244		6,757
Construction in progress	129,385		31,780
	2,383,056		2,144,682
Less - accumulated depreciation and amortization	767,629		612,919
Total property, plant and equipment, net	$	1,615,427	$	1,531,763

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GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION (Condensed Consolidating Statements of Income (Loss)) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Consolidating statement of income
Service revenues	$ 702,033	$ 503,728	$ 2,048,527	$ 1,523,767
Product revenues	205,502	30,078	581,699	105,179
Total revenues	907,535	533,806	2,630,226	1,628,946
Service cost of revenues	478,434	348,758	1,402,409	1,056,174
Product cost of revenues	168,685	24,182	495,060	84,704
Total cost of revenues	647,119	372,940	1,897,469	1,140,878
Selling, general and administrative expenses	114,464	60,339	365,546	197,892
Accretion of environmental liabilities	2,914	2,488	8,628	7,409
Depreciation and amortization	69,430	41,300	196,904	116,794
Income from operations	73,608	56,739	161,679	165,973
Other (expense) income	(150)	(91)	2,030	(465)
Loss on early extinguishment of debt	0	(26,385)	0	(26,385)
Interest (expense) income	(19,326)	(11,596)	(58,784)	(33,836)
Equity in earnings of subsidiaries	0	0	0	0
Intercompany dividend income (expense)	0	0	0	0
Intercompany interest income (expense)	0	0	0	0
Income before provision for income taxes	54,132	18,667	104,925	105,287
Provision (benefit) for income taxes	18,771	6,308	36,160	37,487
Net income	35,361	12,359	68,765	67,800
Other comprehensive (loss) income	21,805	29,980	(37,562)	27,703
Comprehensive (loss) income	57,166	42,339	31,203	95,503
Clean Harbors, Inc.
Consolidating statement of income
Service revenues	0	0	0	0
Product revenues	0	0	0	0
Total revenues	0	0	0	0
Service cost of revenues	0	0	0	0
Product cost of revenues	0	0	0	0
Total cost of revenues	0	0	0	0
Selling, general and administrative expenses	29	9	84	27
Accretion of environmental liabilities	0	0	0	0
Depreciation and amortization	0	0	0	0
Income from operations	(29)	(9)	(84)	(27)
Other (expense) income	0	0	0	0
Loss on early extinguishment of debt		(26,385)		(26,385)
Interest (expense) income	(19,844)	(11,247)	(59,408)	(32,679)
Equity in earnings of subsidiaries	58,919	50,039	134,246	124,965
Intercompany dividend income (expense)	0	0	0	10,010
Intercompany interest income (expense)	0	0	0	0
Income before provision for income taxes	39,046	12,398	74,754	75,884
Provision (benefit) for income taxes	3,685	39	5,989	8,084
Net income	35,361	12,359	68,765	67,800
Other comprehensive (loss) income	21,805	29,980	(37,562)	27,703
Comprehensive (loss) income	57,166	42,339	31,203	95,503
U.S. Guarantor Subsidiaries
Consolidating statement of income
Service revenues	445,165	290,295	1,295,525	850,737
Product revenues	169,743	24,527	463,301	69,364
Total revenues	614,908	314,822	1,758,826	920,101
Service cost of revenues	300,859	198,793	873,945	575,006
Product cost of revenues	139,683	19,904	395,891	55,646
Total cost of revenues	440,542	218,697	1,269,836	630,652
Selling, general and administrative expenses	81,496	35,810	266,941	122,167
Accretion of environmental liabilities	2,478	2,150	7,315	6,430
Depreciation and amortization	45,533	20,778	127,042	56,568
Income from operations	44,859	37,387	87,692	104,284
Other (expense) income	(111)	(8)	2,858	(333)
Loss on early extinguishment of debt		0		0
Interest (expense) income	137	180	137	0
Equity in earnings of subsidiaries	21,064	15,869	57,040	49,236
Intercompany dividend income (expense)	0	0	0	0
Intercompany interest income (expense)	10,107	10,290	30,414	30,894
Income before provision for income taxes	76,056	63,718	178,141	184,081
Provision (benefit) for income taxes	8,218	3,831	14,753	19,473
Net income	67,838	59,887	163,388	164,608
Other comprehensive (loss) income	21,805	29,980	(37,562)	27,703
Comprehensive (loss) income	89,643	89,867	125,826	192,311
Foreign Non-Guarantor Subsidiaries
Consolidating statement of income
Service revenues	256,812	218,304	755,856	687,924
Product revenues	35,815	5,678	119,267	36,608
Total revenues	292,627	223,982	875,123	724,532
Service cost of revenues	177,519	154,836	531,318	496,062
Product cost of revenues	29,058	4,405	100,038	29,851
Total cost of revenues	206,577	159,241	631,356	525,913
Selling, general and administrative expenses	32,939	24,520	98,521	75,698
Accretion of environmental liabilities	436	338	1,313	979
Depreciation and amortization	23,897	20,522	69,862	60,226
Income from operations	28,778	19,361	74,071	61,716
Other (expense) income	(39)	(83)	(828)	(132)
Loss on early extinguishment of debt		0		0
Interest (expense) income	381	(529)	487	(1,157)
Equity in earnings of subsidiaries	0	0	0	0
Intercompany dividend income (expense)	3,063	3,439	10,031	10,354
Intercompany interest income (expense)	(10,107)	(10,290)	(30,414)	(30,894)
Income before provision for income taxes	22,076	11,898	53,347	39,887
Provision (benefit) for income taxes	6,868	2,438	15,418	9,930
Net income	15,208	9,460	37,929	29,957
Other comprehensive (loss) income	(10,072)	13,042	20,385	11,370
Comprehensive (loss) income	5,136	22,502	58,314	41,327
Consolidating Adjustments
Consolidating statement of income
Service revenues	56	(4,871)	(2,854)	(14,894)
Product revenues	(56)	(127)	(869)	(793)
Total revenues	0	(4,998)	(3,723)	(15,687)
Service cost of revenues	56	(4,871)	(2,854)	(14,894)
Product cost of revenues	(56)	(127)	(869)	(793)
Total cost of revenues	0	(4,998)	(3,723)	(15,687)
Selling, general and administrative expenses	0	0	0	0
Accretion of environmental liabilities	0	0	0	0
Depreciation and amortization	0	0	0	0
Income from operations	0	0	0	0
Other (expense) income	0	0	0	0
Loss on early extinguishment of debt		0		0
Interest (expense) income	0	0	0	0
Equity in earnings of subsidiaries	(79,983)	(65,908)	(191,286)	(174,201)
Intercompany dividend income (expense)	(3,063)	(3,439)	(10,031)	(20,364)
Intercompany interest income (expense)	0	0	0	0
Income before provision for income taxes	(83,046)	(69,347)	(201,317)	(194,565)
Provision (benefit) for income taxes	0	0	0	0
Net income	(83,046)	(69,347)	(201,317)	(194,565)
Other comprehensive (loss) income	(11,733)	(43,022)	17,177	(39,073)
Comprehensive (loss) income	$ (94,779)	$ (112,369)	$ (184,140)	$ (233,638)

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EARNINGS PER SHARE

9 Months Ended

Sep. 30, 2013

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				Nine Months Ended
	September 30,				September 30,
	2013		2012		2013		2012
Numerator for basic and diluted earnings per share:
Net income	$	35,361	$	12,359	$	68,765	$	67,800
Denominator:
Basic shares outstanding	60,610		53,374		60,542		53,303
Dilutive effect of equity-based compensation awards	150		191		150		216
Dilutive shares outstanding	60,760		53,565		60,692		53,519
Basic earnings per share:	$	0.58	$	0.23	$	1.14	$	1.27
Diluted earnings per share:	$	0.58	$	0.23	$	1.13	$	1.27

For the three and nine months ended September 30, 2013, the dilutive effect of all then outstanding options, restricted stock and performance awards is included in the EPS calculations above except for 173,000 outstanding performance stock awards for which the performance criteria were not attained at that time. For the three and nine months ended September 30, 2012, the EPS calculations above include the dilutive effects of all then outstanding options, restricted stock, and performance awards except for 66,000 outstanding performance stock awards for which the performance criteria were not attained at that time.

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FINANCING ARRANGEMENTS

9 Months Ended

Sep. 30, 2013

Debt Disclosure [Abstract]

FINANCING ARRANGEMENTS

FINANCING ARRANGEMENTS

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

	September 30, 2013		December 31, 2012
Senior unsecured notes, at 5.25%, due August 1, 2020	$	800,000	$	800,000
Senior unsecured notes, at 5.125%, due June 1, 2021	600,000		600,000
Revolving credit facility, due January 17, 2018	—		—
Long-term obligations	$	1,400,000	$	1,400,000

On January 17, 2013, the Company increased its revolving credit facility to provide for maximum borrowings of up to $400.0 million (with a $325.0 million sub-limit for letters of credit). At September 30, 2013, the revolving credit facility had no outstanding loans, $262.3 million available to borrow and $137.7 million of letters of credit outstanding.

The financing arrangements and principal terms of the Company's $800.0 million principal amount of 5.25% senior unsecured notes due 2020 ("2020 Notes") and $600.0 million principal amount of 5.125% senior unsecured notes due 2021 ("2021 Notes") which were outstanding at September 30, 2013, and the Company's amended $400.0 million revolving credit facility, are discussed further in Note 11, “Financing Arrangements,” in the Company's Annual Report on Form 10-K for the year ended December 31, 2012.

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DOCUMENT AND ENTITY INFORMATION Document	9 Months Ended
	Sep. 30, 2013	Nov. 01, 2013
Document Information [Line Items]
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	Sep. 30, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Common Stock, Shares Outstanding		60,659,766

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INCOME TAXES

9 Months Ended

Sep. 30, 2013

Income Tax Disclosure [Abstract]

INCOME TAXES

INCOME TAXES

The Company’s effective tax rate for the three and nine months ended September 30, 2013 was 34.7% and 34.5%, respectively, compared to 33.8% and 35.6% for the same periods in 2012.

As of September 30, 2013, the Company had recorded $3.9 million of liabilities for unrecognized tax benefits and $1.6 million of interest. As of December 31, 2012, the Company had recorded $3.5 million of liabilities for unrecognized tax benefits and $1.4 million of interest. 

Due to expiring statute of limitation periods, the Company believes that total unrecognized tax benefits will decrease by approximately $3.8 million within the next twelve months. The $3.8 million (which includes interest of $1.3 million) is related to various foreign and state tax laws and, if realized, will be recorded in earnings and therefore will impact the effective income tax rate.

In September 2013, the Internal Revenue Service released final Tangible Property Regulations (the “Final Regulations”). The Final Regulations provide guidance on applying Regulation Section 1.263(a) of the Internal Revenue Code (“IRC”) to amounts paid to acquire, produce or improve tangible property, as well as rules for materials and supplies (IRC Regulation Section 1.162). These regulations contain certain changes from the temporary and proposed tangible property regulations that were issued on December 23, 2011. The Final Regulations are generally effective for taxable years beginning on or after January 1, 2014. In addition, taxpayers are permitted to early adopt the Final Regulations for taxable years beginning on or after January 1, 2012. The Company does not expect the Final Regulations to have a material effect on its results of operations or cash flows. The Company is currently evaluating the impact on its consolidated balance sheets.

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EARNINGS PER SHARE (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Numerator for basic and diluted earnings per share:
Net income	$ 35,361	$ 12,359	$ 68,765	$ 67,800
Denominator:
Basic shares outstanding (in shares)	60,610	53,374	60,542	53,303
Dilutive effect of equity-based compensation awards (in shares)	150	191	150	216
Dilutive shares outstanding (in shares)	60,760	53,565	60,692	53,519
Basic earnings per share:
Basic earnings per share (in USD per share)	$ 0.58	$ 0.23	$ 1.14	$ 1.27
Diluted earnings per share:
Diluted earnings per share (in USD per share)	$ 0.58	$ 0.23	$ 1.13	$ 1.27

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INCOME TAXES (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Income Tax Contingency [Line Items]
The Company's effective tax rate (as a percent)	34.70%	33.80%	34.50%	35.60%
Unrecognized tax benefits	$ 3.9		$ 3.9		$ 3.5
Unrecognized tax benefits, interest	1.6		1.6		1.4
Foreign and State [Member]
Income Tax Contingency [Line Items]
Unrecognized tax benefits, interest	1.3		1.3
Amount of decrease in unrecognized tax benefits that, if realized, will impact the effective tax rate	$ 3.8		$ 3.8