Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash Flows From Operating Activities:
Net loss	$ (40,147)	$ (236,979)
Adjustments to reconcile net loss to net cash provided by operating activities:
Goodwill impairment charges		269,332
Depreciation and amortization	78,448	78,367
Amortization of debt issuance costs and discounts	2,311	2,467
Loss on early extinguishment of debt and write-off of discounts and debt issuance costs		8,143
Loss on sale or disposal of assets	7,651	1,948
Deferred benefit from income tax	(11,823)	(108,173)
Equity-based compensation	13,437	16,020
Changes in assets and liabilities:
Accounts receivable	(43,858)	(23,037)
Inventories	(8,882)	(9,544)
Prepaid expenses and other current assets	(558)	2,674
Accounts payable and accrued expenses	22,487	25,755
Accrued salaries, wages and benefits	7,783	(8,204)
Deferred revenue	87,724	72,278
Other accrued liabilities	13,050	(4,800)
Other assets and liabilities	(809)	2,056
Net cash provided by operating activities	126,814	88,303
Cash Flows From Investing Activities:
Capital expenditures	(97,372)	(103,175)
Other investing activities	(477)
Net cash used in investing activities	(97,849)	(103,175)
Cash Flows From Financing Activities:
Proceeds from issuance of debt		998,306
Repayments of long-term debt	(11,854)	(1,015,056)
Proceeds from draw on revolving credit facility	55,000	80,649
Repayments of revolving credit facility	(70,000)	(65,000)
Debt issuance costs		(15,390)
Dividends paid to stockholders	(304)	(1,502)
Payment of tax withholdings on equity-based compensation through shares withheld	(2,269)	(1,470)
Exercise of stock options	1,185	11
Net cash used in financing activities	(28,242)	(19,452)
Change in Cash and Cash Equivalents, including Restricted Cash	723	(34,324)
Cash and Cash Equivalents, including Restricted Cash—Beginning of period	33,997	69,378
Cash and Cash Equivalents, including Restricted Cash—End of period	34,720	35,054
Supplemental Disclosures of Noncash Investing and Financing Activities
Capital expenditures in accounts payable	32,715	33,132
Dividends declared, but unpaid	$ 124	$ 665