Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Revenue	$ 511,165	$ 367,921	$ 912,381	$ 684,458
Costs and expenses:
Direct costs	439,463	272,041	765,609	506,587
Selling, general and administrative expenses	63,006	46,892	127,481	83,302
Research and development	4,305	3,593	8,395	6,358
Depreciation and amortization	81,516	25,374	118,954	47,244
(Gain) loss on disposal of assets	225	(39)	(506)	(1)
Operating income (loss)	(77,350)	20,060	(107,552)	40,968
Other income (expense):
Interest expense, net	(23,864)	(2,195)	(29,052)	(3,944)
Other income (expense), net	1,737	212	1,571	378
Total other income (expense)	(22,127)	(1,983)	(27,481)	(3,566)
Income (loss) before income taxes	(99,477)	18,077	(135,033)	37,402
Income tax expense (benefit)	(34,356)	6,969	(39,249)	14,706
Net income (loss)	$ (65,121)	$ 11,108	$ (95,784)	$ 22,696
Net income (loss) per common share:
Basic (in dollars per share)	$ (0.56)	$ 0.21	$ (1.08)	$ 0.42
Diluted (in dollars per share)	$ (0.56)	$ 0.20	$ (1.08)	$ 0.40
Weighted average common shares outstanding:
Basic (in shares)	116,851	53,814	88,424	53,722
Diluted (in shares)	116,851	56,709	88,424	56,547