Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash Flows From Operating Activities:
Net (loss) income	$ (187,548)	$ 15,631
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities:
Depreciation and amortization	75,954	79,503
Amortization of debt issuance costs and discounts	1,876	1,773
Deferred income tax (benefit) provision	(12,913)	5,463
Equity-based compensation	(281)	7,282
Other, including loss on sale or disposal of assets, net	322	550
Changes in assets and liabilities:
Accounts receivable	26,349	(7,033)
Inventories	(2,655)	(7,399)
Prepaid expenses and other current assets	(5,294)	976
Accounts payable and accrued expenses	24,624	15,167
Accrued salaries, wages and benefits	(7,929)	(6,216)
Deferred revenue	36,234	64,052
Other accrued liabilities	(17,616)	(2,989)
Right-of-use assets and operating lease obligations	253	263
Other assets and liabilities	298	363
Net cash (used in) provided by operating activities	(68,326)	167,386
Cash Flows From Investing Activities:
Capital expenditures	(53,699)	(112,738)
Other investing activities, net		(52)
Net cash used in investing activities	(53,699)	(112,790)
Cash Flows From Financing Activities:
Proceeds from issuance of senior secured notes, net	222,335
Repayments of long-term debt	(7,752)	(7,753)
Proceeds from draws on revolving credit facility	272,500	219,000
Repayments of revolving credit facility	(11,500)	(104,000)
Purchase of treasury stock	(12,406)	(150,000)
Payment of tax withholdings on equity-based compensation through shares withheld	(3,314)	(3,968)
Exercise of stock options	218	2,335
Debt issuance costs	(1,089)
Other financing activities	(719)	(398)
Net cash provided by (used in) financing activities	458,273	(44,784)
Change in Cash and Cash Equivalents, including Restricted Cash	336,248	9,812
Cash and Cash Equivalents, including Restricted Cash—Beginning of period	40,925	35,007
Cash and Cash Equivalents, including Restricted Cash—End of period	377,173	44,819
Supplemental Disclosure of Noncash Investing and Financing Activities:
Capital expenditures in accounts payable	48,550	28,553
Right-of-use assets obtained in exchange for financing lease obligations	208	$ 1,230
Other financing arrangements	$ 2,837