Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
	Jan. 01, 2017	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenue		$ 390,143		$ 704,337
Costs and expenses:
(Gain) loss on disposal of assets		(3,136)	$ 1,712	(9,192)	$ 4,914
Operating loss		(13,244)		(49,652)
Direct costs		310,473		572,216
Selling, general and administrative expenses		61,165		123,257
Research and development		2,052		3,269
Depreciation and amortization		32,833	54,283	64,439	113,236
Impairment expense			48,712		430,406
Interest expense, net		(414)	121,934	(1,105)	(147,401)
Other income (expense):
Interest expense, net		(414)	121,934	(1,105)	(147,401)
Other income (expense), net		(1,456)	2,003	106	5,325
Total other income (expense)		(1,870)		(999)
Income (loss) before reorganization items and income taxes		(15,114)		(50,651)
Reorganization items
Income tax benefit		(2,393)	(11,252)	(5,629)	(105,399)
Net income (loss)		$ (12,721)	(291,116)	$ (45,022)	(719,529)
Diluted (in dollars per share)		$ (0.20)		$ (0.76)
Net loss per common share:
Basic (in dollars per share)		$ (0.20)		$ (0.76)
Weighted average common shares outstanding:
Basic (in shares)		62,232		58,913
Diluted (in shares)		62,232		58,913
Revenue		$ 390,143		$ 704,337
Predecessor [Member]
Revenue			225,168		494,783
Costs and expenses:
(Gain) loss on disposal of assets			1,712		4,914
Operating loss			(182,437)		(682,852)
Direct costs			229,771		491,536
Selling, general and administrative expenses			71,341		133,380
Research and development			1,786		4,163
Depreciation and amortization			54,283		113,236
Impairment expense			48,712		430,406
Interest expense, net			(121,934)		(147,401)
Other income (expense):
Interest expense, net			(121,934)		(147,401)
Other income (expense), net			2,003		5,325
Total other income (expense)			(119,931)		(142,076)
Income (loss) before reorganization items and income taxes			(302,368)		(824,928)
Reorganization items	(293,969)
Income tax benefit	(4,613)		(11,252)		(105,399)
Net income (loss)	$ 298,582		$ (291,116)		$ (719,529)
Diluted (in dollars per share)	$ 2.52		$ (2.46)		$ (6.10)
Net loss per common share:
Basic (in dollars per share)	$ 2.52		$ (2.46)		$ (6.10)
Weighted average common shares outstanding:
Basic (in shares)	118,633		118,426		117,979
Diluted (in shares)	118,633		118,426		117,979
Revenue			$ 225,168		$ 494,783