Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Operating activities:
Net income (loss)	$ 7,229	$ (34,354)
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Depreciation	27,906	26,952
Gain on disposition of assets	(1,213)	(4,044)
Deferred tax provision	(14,457)	(5,217)
Stock-based compensation expense	4,414	4,531
Contract liabilities, net	297	(13,411)
Contract assets, net	(270)	(334)
Deferred contract costs, net	(2,560)	1,850
Collateral deposits	0	(1,482)
Other assets, noncurrent	(400)	(302)
Other liabilities, noncurrent	1,883	2,992
Other	706	418
Changes in operating assets and liabilities:
Accounts receivable	(15,023)	26,909
Prepaid expenses and other current assets	(4,229)	1,378
Accounts payable and accrued liabilities	(7,796)	11,129
Taxes payable	(4,664)	(7,957)
Net cash (used in) provided by operating activities	(8,177)	9,058
Investing activities:
Capital expenditures	(29,413)	(20,046)
Proceeds from disposition of assets, net of disposal costs	663	5,045
Net cash used in investing activities	(28,750)	(15,001)
Financing activities:
Borrowings under revolving credit facility	0	20,000
Repayments under revolving credit facility	(15,000)	0
Principal payments of finance lease liabilities	(4,079)	(3,813)
Net cash (used in) provided by financing activities	(19,079)	16,187
Net change in cash, cash equivalents and restricted cash	(56,006)	10,244
Cash, cash equivalents and restricted cash, beginning of period	97,334	62,729
Cash, cash equivalents and restricted cash, end of period	$ 41,328	$ 72,973