CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Cash flows from operating activities:
Net income	$ 68,486	$ 40,342
Adjustments to reconcile net income to net cash used in operating activities (net of effect of acquisitions):
Depreciation and amortization	50,274	54,754
Stock-based compensation expense	6,360	5,388
Gain on sale of property and equipment	(26,237)	(14,735)
Unrealized (gain) loss on interest rate swap	(231)	(2,745)
Other non-cash items	2,749	982
Changes in assets and liabilities:
Accounts receivable	(208,407)	(154,016)
Contract assets	(27,953)	(170,479)
Other current assets	(5,183)	27,291
Other long-term assets	(2,240)	(1,230)
Accounts payable	(44,520)	(21,959)
Contract liabilities	117,410	136,202
Operating lease assets and liabilities, net	(4,788)	2,354
Accrued liabilities	52,521	16,037
Other long-term liabilities	9,362	982
Net cash used in operating activities	(12,397)	(80,832)
Cash flows from investing activities:
Purchase of property and equipment	(34,637)	(42,392)
Proceeds from sale of assets	73,930	23,465
Cash paid for acquisitions, net of cash and restricted cash acquired		9,300
Net cash provided by (used in) investing activities	39,293	(9,627)
Cash flows from financing activities:
Borrowings under revolving lines of credit		390,000
Payments on revolving lines of credit		(370,000)
Payments on long-term debt	(26,148)	(51,234)
Payments related to tax withholding for stock-based compensation	(4,772)	(1,391)
Dividends paid	(6,424)	(6,383)
Other	(1,760)	(2,106)
Net cash used in financing activities	(39,104)	(41,114)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	1,654	946
Net change in cash, cash equivalents and restricted cash	(10,554)	(130,627)
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	212,988	128,364
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION
Cash paid for interest	34,090	36,956
Cash paid for income taxes, net of refunds received	9,192	(16,293)
Leased assets obtained in exchange for new operating leases	120,228	92,555
SUPPLEMENTAL DISCLOSURES OF NONCASH INVESTING AND FINANCING ACTIVITIES
Dividends declared and not yet paid	$ 3,217	$ 3,199