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	$ 18,467	$ 12,921
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	84,395	89,905
Long-lived and other asset impairment	12,063	10,033
Inventory write-downs	721	511
Amortization of operating lease ROU assets	1,575	1,891
Amortization of deferred financing costs	2,576	7,551
Amortization of debt premium	(1,003)	(1,003)
Amortization of dedesignated interest rate swap	410
Interest rate swaps	631	2,169
Stock-based compensation expense	6,037	5,841
Provision for credit losses	365	(215)
Gain on sale of assets, net	(4,344)	(8,161)
Gain on sale of business	(16,716)	(5,995)
Deferred income tax provision	9,473	7,995
Amortization of contract costs	9,249	10,752
Deferred revenue recognized in earnings	(11,541)	(5,048)
Change in assets and liabilities:
Accounts receivable, trade	(30,370)	(2,661)
Inventory	(5,779)	(3,569)
Other assets	(1,182)	(244)
Contract costs, net	(13,007)	(6,467)
Accounts payable and other liabilities	13,051	6,358
Deferred revenue	14,032	4,068
Other	421	(15)
Net cash provided by operating activities	89,524	126,617
Cash flows from investing activities:
Capital expenditures	(106,066)	(38,749)
Proceeds from sale of business	55,523	18,795
Proceeds from sale of property, plant and equipment and other assets	9,728	18,178
Proceeds from insurance and other settlements	2,781	910
Investments in unconsolidated entities	(8,000)
Net cash (used in) investing activities	(46,034)	(866)
Cash flows from financing activities:
Borrowings of long-term debt	405,733	343,251
Repayments of long-term debt	(404,500)	(419,751)
Payments for debt issuance costs		(2,407)
Payments for settlement of interest rate swaps that include financing elements	(1,334)	(2,169)
Dividends paid to stockholders	(45,167)	(44,486)
Net proceeds from issuance of common stock	4,230	3,401
Proceeds from stock issued under ESPP	295	371
Purchases of treasury stock	(2,366)	(1,746)
Net cash used in financing activities	(43,109)	(123,536)
Net increase in cash and cash equivalents	381	2,215
Cash and cash equivalents, beginning of period	1,569	1,097
Cash and cash equivalents, end of period	$ 1,950	$ 3,312