Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Cash flows from operating activities:
Net income	$ 33,838	$ 22,225
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	124,348	135,185
Long-lived and other asset impairment	16,217	15,154
Inventory write-downs	1,040	621
Amortization of operating lease right-of-use assets	2,407	2,922
Amortization of debt issuance costs	3,864	8,839
Amortization of debt premium	(1,504)	(1,504)
Amortization of dedesignated interest rate swap	410	431
Interest rate swaps	631	2,866
Stock-based compensation expense	9,035	8,741
Provision for credit losses	(28)	151
Gain on sale of assets, net	(5,535)	(10,604)
Gain on sale of business	(28,220)	(18,945)
Deferred income tax provision	13,624	11,778
Amortization of contract costs	14,211	15,523
Deferred revenue recognized in earnings	(15,709)	(8,081)
Changes in operating assets and liabilities:
Accounts receivable, net	(29,130)	(2,133)
Inventory	(8,339)	(5,994)
Other assets	697	1,326
Contract costs	(22,486)	(11,481)
Accounts payable and other liabilities	37,251	33,626
Deferred revenue recognized in earnings	19,614	8,167
Other	96	(88)
Net cash provided by operating activities	166,332	208,725
Cash flows from investing activities:
Capital expenditures	(171,032)	(70,881)
Proceeds from sale of property, equipment and other assets	13,348	24,683
Proceeds from sale of business	99,785	83,075
Proceeds from insurance and other settlements	3,353	977
Investments in unconsolidated entities	(12,000)
Net cash (used in) provided by investing activities	(66,546)	37,854
Cash flows from financing activities:
Borrowings of long-term debt	579,483	522,751
Repayments of long-term debt	(611,983)	(695,751)
Payments of debt issuance costs		(2,451)
Payments for settlement of interest rate swaps that include financing elements	(1,334)	(3,283)
Dividends paid to stockholders	(67,726)	(66,992)
Net proceeds from issuance of common stock	4,182	3,401
Proceeds from stock issued under ESPP	462	546
Purchases of treasury stock	(2,397)	(2,409)
Net cash used in financing activities	(99,313)	(244,188)
Net increase in cash and cash equivalents	473	2,391
Cash and cash equivalents, beginning of period	1,569	1,097
Cash and cash equivalents, end of period	$ 2,042	$ 3,488