Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands		6 Months Ended		12 Months Ended
	Jan. 01, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Cash flows from operating activities:
Net income (loss)		$ 49,090	$ (45,022)	$ 22,457
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization		100,730	64,439
Deferred income taxes		(1,112)
Provision for doubtful accounts		1,497	2,032
Equity (earnings) loss from unconsolidated affiliate		1,199	(153)
Gain on disposal of assets		(440)	(9,192)
Share-based compensation expense		10,917	19,541
Amortization of deferred financing costs		1,856	306
Reorganization items, net
Changes in operating assets and liabilities:
Accounts receivable		(46,408)	(159,643)
Inventories		(6,020)	(6,978)
Prepaid expenses and other current assets		2,933	6,741
Accounts payable		40,239	27,784
Payroll related costs and accrued expenses		(23,077)	6,747
Liabilities subject to compromise
Income taxes receivable (payable)		4,215	(5,200)
Other		(892)	1,744
Net cash provided by (used in) operating activities		134,727	(96,854)
Cash flows from investing activities:
Purchases of and deposits on property, plant and equipment		(155,790)	(72,547)
Proceeds from disposal of property, plant and equipment and non-core service lines		20,862	31,182
Business acquisition purchase price adjustment		1,500
Net cash used in investing activities		(133,428)	(41,365)
Cash flows from financing activities:
Payments on DIP Facility
Financing costs		(3,144)	(1,463)
Proceeds from issuance of common stock, net of offering costs			215,920
Employee tax withholding on restricted stock vesting		(2,193)	(3,870)
Net cash provided by (used in) financing activities		(5,337)	210,587
Effect of exchange rate changes on cash		193	(855)
Net increase (decrease) in cash and cash equivalents		(3,845)	71,513
Cash and cash equivalents, beginning of period	$ 181,242	113,887	181,242	181,242
Cash and cash equivalents, end of period		$ 110,042	252,755	113,887
Predecessor [Member]
Cash flows from operating activities:
Net income (loss)	298,582
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization
Deferred income taxes	(4,613)
Provision for doubtful accounts
Equity (earnings) loss from unconsolidated affiliate
Gain on disposal of assets
Share-based compensation expense
Amortization of deferred financing costs
Reorganization items, net	(315,626)
Changes in operating assets and liabilities:
Accounts receivable
Inventories
Prepaid expenses and other current assets
Accounts payable
Payroll related costs and accrued expenses	(1,436)
Liabilities subject to compromise	(33,000)
Income taxes receivable (payable)
Other
Net cash provided by (used in) operating activities	(56,093)
Cash flows from investing activities:
Purchases of and deposits on property, plant and equipment
Proceeds from disposal of property, plant and equipment and non-core service lines
Business acquisition purchase price adjustment
Net cash used in investing activities
Cash flows from financing activities:
Payments on DIP Facility	(25,000)
Financing costs	(2,248)
Proceeds from issuance of common stock, net of offering costs	200,000
Employee tax withholding on restricted stock vesting
Net cash provided by (used in) financing activities	172,752
Effect of exchange rate changes on cash
Net increase (decrease) in cash and cash equivalents	116,659
Cash and cash equivalents, beginning of period	64,583		$ 64,583	$ 64,583
Cash and cash equivalents, end of period	$ 181,242