UNAUDITED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Revenues:
Service revenues	$ 530,231	$ 596,330
Product revenues	105,852	136,169
Total revenues	636,083	732,499
Cost of revenues (exclusive of items shown separately below)
Service revenues	373,986	416,390
Product revenues	90,293	130,117
Total cost of revenues	464,279	546,507
Selling, general and administrative expenses	104,484	107,715
Accretion of environmental liabilities	2,505	2,619
Depreciation and amortization	68,902	68,356
(Loss) income from operations	(4,087)	7,302
Other (expense) income	(350)	409
Interest expense, net of interest income of $150 and $151, respectively	(18,980)	(19,438)
(Loss) income before (benefit) provision for income taxes	(23,417)	(11,727)
Benefit for income taxes	(2,546)	(4,638)
Net (loss) income	$ (20,871)	$ (7,089)
Loss per share:
Basic (in USD per share)	$ (0.36)	$ (0.12)
Diluted (in USD per share)	$ (0.36)	$ (0.12)
Shares used to compute loss per share - Basic	57,617	58,875
Shares used to compute loss per share - Diluted	57,617	58,875