SEGMENT REPORTING (Tables)

6 Months Ended

Jun. 30, 2015

Segment Reporting [Abstract]

Reconciliation of third party revenues to direct revenues

The following table reconciles third party revenues to direct revenues for the three and six months ended June 30, 2015 and 2014 (in thousands):

	For the Three Months Ended June 30, 2015											For the Three Months Ended June 30, 2014
	Third party revenues		Intersegment revenues, net			Corporate Items, net			Direct revenues			Third party revenues		Intersegment revenues, net			Corporate Items, net			Direct revenues
Technical Services	$	248,025	$	38,314		$	1,083		$	287,422		$	256,798	$	40,082		$	778		$	297,658
Industrial and Field Services	353,329		(11,230		)	(401		)	341,698			185,154		(11,047		)	36			174,143
Oil Re-refining and Recycling	99,104		(21,428		)	(1		)	77,675			144,016		(54,861		)	(5		)	89,150
SK Environmental Services	175,876		(8,802		)	3			167,077			171,324		23,307			—			194,631
Lodging Services	21,171		992			80			22,243			42,872		900			25			43,797
Oil and Gas Field Services	38,617		2,154			40			40,811			58,177		1,619			(22		)	59,774
Corporate Items	106		—			(804		)	(698		)	139		—			(812		)	(673		)
Total	$	936,228	$	—		$	—		$	936,228		$	858,480	$	—		$	—		$	858,480

	For the Six Months Ended June 30, 2015											For the Six Months Ended June 30, 2014
	Third party revenues		Intersegment revenues, net			Corporate Items, net			Direct revenues			Third party revenues		Intersegment revenues, net			Corporate Items, net			Direct revenues
Technical Services	$	488,350	$	73,218		$	2,380		$	563,948		$	493,579	$	77,516		$	1,177		$	572,272
Industrial and Field Services	500,197		(17,791		)	(323		)	482,083			347,114		(22,805		)	191			324,500
Oil Re-refining and Recycling	195,911		(39,685		)	(2		)	156,224			272,937		(102,977		)	(5		)	169,955
SK Environmental Services	336,560		(20,384		)	3			316,179			332,712		43,264			(58		)	375,918
Lodging Services	55,275		1,156			97			56,528			99,566		1,294			26			100,886
Oil and Gas Field Services	92,204		3,486			49			95,739			158,949		3,708			(10		)	162,647
Corporate Items	230		—			(2,204		)	(1,974		)	290		—			(1,321		)	(1,031		)
Total	$	1,668,727	$	—		$	—		$	1,668,727		$	1,705,147	$	—		$	—		$	1,705,147

Reconciliation to consolidated statements of income to adjusted EBITDA

The following table presents Adjusted EBITDA information used by management for each reportable segment (in thousands). The Company does not allocate interest expense, income taxes, depreciation, amortization, accretion of environmental liabilities, other non-cash charges not deemed representative of fundamental segment results, and other expense (income) to its segments.    

	For the Three Months Ended						For the Six Months Ended
	June 30,						June 30,
	2015			2014			2015			2014
Adjusted EBITDA:
Technical Services	$	76,808		$	84,297		$	140,209		$	146,474
Industrial and Field Services	73,081			30,716			83,390			47,088
Oil Re-refining and Recycling	15,824			15,196			11,348			27,779
SK Environmental Services	41,195			31,307			68,444			54,132
Lodging Services	3,852			15,487			10,762			33,224
Oil and Gas Field Services	(2,182		)	1,812			(779		)	18,143
Corporate Items	(45,456		)	(43,016		)	(71,975		)	(89,055		)
Total	$	163,122		$	135,799		$	241,399		$	237,785
Reconciliation to Consolidated Statements of Income:
Accretion of environmental liabilities	2,599			2,609			5,218			5,333
Depreciation and amortization	67,773			66,075			136,129			135,431
Goodwill impairment charge	31,992			—			31,992			—
Income from operations	60,758			67,115			68,060			97,021
Other expense (income)	660			655			251			(3,523		)
Interest expense, net of interest income	19,249			19,382			38,687			38,936
Income before provision for income taxes	$	40,849		$	47,078		$	29,122		$	61,608

PP&E, intangible assets and total assets by segment

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

	June 30, 2015
	Technical Services		Industrial and Field Services		Oil Re-refining and Recycling		SK Environmental Services		Lodging Services		Oil and Gas Field Services		Corporate Items		Totals
Property, plant and equipment, net	$	447,937	$	254,035	$	196,347	$	264,067	$	122,926	$	185,312	$	91,630	$	1,562,254
Goodwill	49,733		107,507		50,393		209,555		35,670		—		—		452,858
Permits and other intangible, net	76,883		16,227		146,014		266,442		8,994		20,061		—		534,621
Total assets	$	794,383	$	391,560	$	507,585	$	807,773	$	204,561	$	288,406	$	752,369	$	3,746,637

	December 31, 2014
	Technical Services		Industrial and Field Services		Oil Re-refining and Recycling		SK Environmental Services		Lodging Services		Oil and Gas Field Services		Corporate Items		Totals
Property, plant and equipment, net	$	412,323	$	245,115	$	201,451	$	240,078	$	141,965	$	215,574	$	102,328	$	1,558,834
Goodwill	50,092		109,214		50,883		173,873		34,863		33,744		—		452,669
Permits and other intangible, net	74,870		17,801		151,041		252,897		10,744		22,727		—		530,080
Total assets	$	756,169	$	392,652	$	538,921	$	731,072	$	231,782	$	361,223	$	692,459	$	3,704,278

Total assets by geographical area

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

	June 30, 2015		December 31, 2014
United States	$	2,745,414	$	2,572,494
Canada	997,268		1,128,458
Other foreign	3,955		3,326
Total	$	3,746,637	$	3,704,278