CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Cash flows from operating activities:
Net income	$ 126,922	$ 88,486
Adjustments to reconcile net income to net cash provided by (used in) operating activities (net of effect of acquisitions):
Depreciation and amortization	72,948	81,454
Stock-based compensation expense	10,348	8,955
Gain on sale of property and equipment	(38,490)	(29,603)
Unrealized loss (gain) on interest rate swap	1,202	(3,001)
Other non-cash items	3,286	1,546
Changes in assets and liabilities:
Accounts receivable	(263,175)	(185,815)
Contract assets	39,517	(128,360)
Other current assets	(7,076)	32,961
Other long-term assets	(1,045)	633
Accounts payable	(139,074)	(34,855)
Contract liabilities	290,636	106,042
Operating lease assets and liabilities, net	(3,903)	3,114
Accrued liabilities	106,551	51,182
Other long-term liabilities	11,407	114
Net cash provided by (used in) operating activities	210,054	(7,147)
Cash flows from investing activities:
Purchase of property and equipment	(98,338)	(82,500)
Proceeds from sale of assets	97,447	47,579
Cash paid for acquisitions, net of cash and restricted cash acquired		9,300
Net cash (used in) investing activities	(891)	(25,621)
Cash flows from financing activities:
Borrowings under revolving lines of credit		440,223
Payments on revolving lines of credit		(420,223)
Payments on long-term debt	(55,878)	(66,055)
Payments related to tax withholding for stock-based compensation	(6,591)	(1,637)
Dividends paid	(9,641)	(9,582)
Other	(1,912)	(2,749)
Net cash used in financing activities	(74,022)	(60,023)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(400)	346
Net change in cash, cash equivalents and restricted cash	134,741	(92,445)
Cash, cash equivalents and restricted cash at beginning of the period	223,542	258,991
Cash, cash equivalents and restricted cash at end of the period	358,283	166,546
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION
Cash paid for interest	49,831	57,351
Cash paid for income taxes, net of refunds received	15,462	(6,622)
Leased assets obtained in exchange for new operating leases	177,675	181,328
SUPPLEMENTAL DISCLOSURES OF NONCASH INVESTING AND FINANCING ACTIVITIES
Dividends declared and not yet paid	$ 3,223	$ 3,203