Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Cash Flows From Operating Activities:
Net income	$ 70,588	$ 107,623
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	75,225	77,163
Amortization of debt issuance costs and discounts	3,078	3,130
Deferred income tax provision	17,397	26,530
Equity-based compensation	8,207	9,531
Other, including loss on sale or disposal of assets, net	13,425	8,539
Changes in assets and liabilities:
Accounts receivable	(22,415)	(9,690)
Inventories	(4,881)	(27,126)
Prepaid expenses and other current assets	(5,372)	(10,101)
Accounts payable and accrued expenses	13,925	34,902
Accrued salaries, wages and benefits	2,375	(5,737)
Deferred revenue	58,256	80,778
Other accrued liabilities	12,562	4,699
Right of use assets and operating lease liabilities	197	354
Other assets and liabilities	(7,666)	(961)
Net cash provided by operating activities	234,901	299,634
Cash Flows From Investing Activities:
Capital expenditures	(145,587)	(101,048)
Net cash used in investing activities	(145,587)	(101,048)
Cash Flows From Financing Activities:
Repayments of long-term debt	(6,000)	(6,000)
Proceeds from draws on revolving credit facility	20,000
Repayments of revolving credit facility	(20,000)
Purchase of treasury stock	(13,947)	(454,801)
Payment of tax withholdings on equity-based compensation through shares withheld	(6,340)	(22,067)
Exercise of stock options	1,644	1,935
Debt issuance costs		(469)
Other financing activities	(245)	(371)
Net cash used in financing activities	(24,888)	(481,773)
Change in Cash and Cash Equivalents, including Restricted Cash	64,426	(283,187)
Cash and Cash Equivalents, including Restricted Cash—Beginning of period	82,320	444,486
Cash and Cash Equivalents, including Restricted Cash—End of period	146,746	161,299
Supplemental Disclosure of Noncash Investing and Financing Activities
Capital expenditures in accounts payable	53,080	25,599
Right-of-use assets obtained in exchange for financing lease obligations	$ 1,770
Treasury stock purchases not yet settled in other accrued liabilities		$ 9,756