Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
	Jan. 01, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue		$ 610,521	$ 390,143	$ 1,163,521	$ 704,337
Costs and expenses:
Direct costs		463,602	310,473	882,599	572,216
Selling, general and administrative expenses		59,908	61,165	125,843	123,257
Research and development		1,681	2,052	3,553	3,269
Depreciation and amortization		54,387	32,833	100,730	64,439
(Gain) loss on disposal of assets		49	(3,136)	(440)	(9,192)
Operating income (loss)		30,894	(13,244)	51,236	(49,652)
Other income (expense):
Interest expense, net		(2,185)	(414)	(2,613)	(1,105)
Other income (expense), net		(1,106)	(1,456)	(486)	106
Total other income (expense)		(3,291)	(1,870)	(3,099)	(999)
Income (loss) before reorganization items and income taxes		27,603	(15,114)	48,137	(50,651)
Income tax benefit		(893)	(2,393)	(953)	(5,629)
Net income (loss)		$ 28,496	$ (12,721)	49,090	(45,022)
Reorganization items
Net income (loss) per common share:
Basic (in dollars per share)		$ 0.42	$ (0.20)	$ 0.73	$ (0.76)
Diluted (in dollars per share)		$ 0.42	$ (0.20)	$ 0.73	$ (0.76)
Weighted average common shares outstanding:
Basic (in shares)		67,268	62,232	67,227	58,913
Diluted (in shares)		67,268	62,232	67,267	58,913
Revenue		$ 610,521	$ 390,143	$ 1,163,521	$ 704,337
Predecessor [Member]
Revenue
Costs and expenses:
Direct costs
Selling, general and administrative expenses
Research and development
Depreciation and amortization
(Gain) loss on disposal of assets
Operating income (loss)
Other income (expense):
Interest expense, net
Other income (expense), net
Total other income (expense)
Income (loss) before reorganization items and income taxes
Income tax benefit	(4,613)
Net income (loss)	298,582
Reorganization items	$ (293,969)
Net income (loss) per common share:
Basic (in dollars per share)	$ 2.52
Diluted (in dollars per share)	$ 2.52
Weighted average common shares outstanding:
Basic (in shares)	118,633
Diluted (in shares)	118,633
Revenue