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UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Cash flows from operating activities:    
Net income $ 81,868 $ 14,311
Adjustments to reconcile net income to net cash flows provided by operating activities:    
Depreciation and amortization of property and equipment 45,664 45,131
Amortization of intangible assets 3,613 3,666
Stock-based compensation expense 9,808 6,198
Deferred income taxes 3,312 (144)
Gain on sale of property and equipment (3,213) (4,745)
Other non-cash items 345 1,044
Changes in operating assets and liabilities:    
Accounts receivable, net 53,714 (50,193)
Contract assets, net (49,762) 8,212
Receivable for insurance claims in excess of deductibles (511) (1,975)
Other assets 14,241 21,687
Accounts payable 4,795 (20,607)
Contract liabilities (19,889) 22,294
Accrued self-insurance 2,845 (402)
Other liabilities 64,907 21,519
Net cash flows provided by operating activities 211,737 65,996
Cash flows from investing activities:    
Proceeds from sale of property and equipment 6,014 6,815
Purchases of property and equipment (64,467) (63,634)
Net cash flows used in investing activities (58,453) (56,819)
Cash flows from financing activities:    
Borrowings under revolving lines of credit 635,003 584,070
Repayments under revolving lines of credit (633,048) (520,076)
Payment of principal obligations under equipment notes (4,360) (7,049)
Payment of principal obligations under finance leases (844) (2,083)
Repurchase of common stock (75,000) (75,000)
Debt refinancing costs 0 (34)
Payments related to tax withholding for stock-based compensation (2,653) (5,866)
Net cash flows used in financing activities (80,902) (26,038)
Effect of exchange rate changes on cash 365 (469)
Net increase (decrease) in cash and cash equivalents 72,747 (17,330)
Cash and cash equivalents:    
Beginning of period 3,464 24,899
End of period $ 76,211 $ 7,569