CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Cash flows from operating activities:
Net income	$ 88,486	$ 91,520
Adjustments to reconcile net income to net cash used in operating activities (net of effect of acquisitions):
Depreciation and amortization	81,454	69,348
Stock-based compensation expense	8,955	5,748
Gain on sale of property and equipment	(29,603)	(17,987)
Gain on sale and leaseback transaction		(40,084)
Unrealized gain on interest rate swap	(3,001)	(5,616)
Other non-cash items	1,546	1,877
Changes in assets and liabilities:
Accounts receivable	(185,815)	(122,867)
Contract assets	(128,360)	(148,044)
Other current assets	32,961	(98,489)
Other long-term assets	633	1,975
Accounts payable	(34,855)	133,731
Contract liabilities	106,042	(10,364)
Operating lease assets and liabilities, net	3,114	(896)
Accrued liabilities	51,182	40,016
Other long-term liabilities	114	(1,903)
Net cash used in operating activities	(7,147)	(102,035)
Cash flows from investing activities:
Purchase of property and equipment	(82,500)	(75,696)
Proceeds from sale of assets	47,579	19,237
Proceeds from sale and leaseback transaction, net of related expenses		49,887
Cash paid for acquisitions, net of cash and restricted cash acquired	9,300	(478,438)
Net cash used in investing activities	(25,621)	(485,010)
Cash flows from financing activities:
Borrowings under revolving lines of credit	440,223	169,943
Payments on revolving lines of credit	(420,223)	(19,804)
Proceeds from issuance of long-term debt		469,531
Payments on long-term debt	(66,055)	(77,751)
Proceeds from issuance of common stock	681	596
Debt issuance costs		(6,643)
Dividends paid	(9,582)	(9,583)
Purchase of common stock		(5,990)
Other	(5,067)	(4,947)
Net cash (used in) provided by financing activities	(60,023)	515,352
Effect of exchange rate changes on cash, cash equivalents and restricted cash	346	(924)
Net change in cash, cash equivalents and restricted cash	(92,445)	(72,617)
Cash, cash equivalents and restricted cash at beginning of the period	258,991	205,643
Cash, cash equivalents and restricted cash at end of the period	166,546	133,026
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION
Cash paid for interest	57,351	20,025
Cash paid for income taxes, net of refunds received	(6,622)	2,540
Leased assets obtained in exchange for new operating leases	181,328	40,144
SUPPLEMENTAL DISCLOSURES OF NONCASH INVESTING AND FINANCING ACTIVITIES
Dividends declared and not yet paid	$ 3,203	$ 3,195