Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash Flows From Operating Activities:
Net loss	$ (62,844)	$ (61,129)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	38,430	38,867
Amortization of debt issuance costs and discounts	1,157	1,324
Loss on early extinguishment of debt and write-off of discounts and debt issuance costs		8,020
Loss on sale or disposal of assets	396	1,739
Deferred benefit from income tax	(23,817)	(41,801)
Equity-based compensation	7,545	4,114
Changes in assets and liabilities:
Accounts receivable	(21,218)	(5,055)
Inventories	(6,761)	(4,812)
Prepaid expenses and other current assets	(3,141)	(4,046)
Accounts payable and accrued expenses	16,540	27,198
Accrued salaries, wages and benefits	5,729	(3,332)
Deferred revenue	62,162	54,875
Other accrued liabilities	5,879	(12,087)
Other assets and liabilities	260	1,817
Net cash provided by operating activities	20,317	5,692
Cash Flows From Investing Activities:
Capital expenditures	(45,822)	(56,853)
Net cash used in investing activities	(45,822)	(56,853)
Cash Flows From Financing Activities:
Proceeds from issuance of debt		998,306
Repayments of long-term debt	(5,927)	(1,006,336)
Proceeds from draw on revolving credit facility	45,000	60,649
Repayments of revolving credit facility	(5,000)	(20,000)
Debt issuance costs		(15,390)
Dividends paid to stockholders	(287)	(110)
Payment of tax withholdings on equity-based compensation through shares withheld	(1,634)	(749)
Exercise of stock options	7
Net cash provided by financing activities	32,159	16,370
Change in Cash and Cash Equivalents, including Restricted Cash	6,654	(34,791)
Cash and Cash Equivalents, including Restricted Cash—Beginning of period	33,997	69,378
Cash and Cash Equivalents, including Restricted Cash—End of period	40,651	34,587
Supplemental Disclosures of Noncash Investing and Financing Activities
Capital expenditures in accounts payable	32,744	12,237
Dividends declared, but unpaid	$ 136	$ 815