Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash Flows From Operating Activities:
Net income	$ 107,623	$ 82,878
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	77,163	72,805
Amortization of debt issuance costs and discounts	3,130	3,323
Deferred income tax provision	26,530	682
Equity-based compensation	9,531	10,107
Other, including loss on sale or disposal of assets, net	8,539	2,112
Changes in assets and liabilities:
Accounts receivable	(9,690)	(75,345)
Inventories	(27,126)	5,647
Prepaid expenses and other current assets	(10,101)	(3,896)
Accounts payable and accrued expenses	34,902	20,361
Accrued salaries, wages and benefits	(5,737)	8,464
Deferred revenue	80,778	121,815
Other accrued liabilities	4,699	845
Right-of-use assets and operating lease liabilities	354	224
Other assets and liabilities	(961)	(1,944)
Net cash provided by operating activities	299,634	248,078
Cash Flows From Investing Activities:
Capital expenditures	(101,048)	(44,981)
Net cash used in investing activities	(101,048)	(44,981)
Cash Flows From Financing Activities:
Repayments of long-term debt	(6,000)	(7,752)
Purchase of treasury stock	(454,801)
Payment of tax withholdings on equity-based compensation through shares withheld	(22,067)	(12,528)
Exercise of stock options	1,935	4,032
Debt issuance costs	(469)
Other financing activities	(371)	(4,357)
Net cash used in financing activities	(481,773)	(20,605)
Change in Cash and Cash Equivalents, including Restricted Cash	(283,187)	182,492
Cash and Cash Equivalents, including Restricted Cash—Beginning of period	444,486	435,225
Cash and Cash Equivalents, including Restricted Cash—End of period	161,299	617,717
Supplemental Disclosure of Noncash Investing and Financing Activities:
Capital expenditures in accounts payable	25,599	18,737
Treasury stock purchases not yet settled in other accrued liabilities	$ 9,756
Other financing arrangements		$ 4,239