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UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Cash flows from operating activities:    
Net income $ 14,311 $ 66,948
Adjustments to reconcile net income to net cash flows provided by operating activities:    
Depreciation and amortization of property and equipment 45,131 39,848
Amortization of intangible assets 3,666 3,686
Stock-based compensation expense 6,198 6,562
Deferred income taxes (144) 0
Gain on sale of property and equipment (4,745) (3,293)
Other non-cash items 1,044 564
Changes in operating assets and liabilities:    
Accounts receivable, net (50,193) (76,349)
Contract assets, net 8,212 (109,803)
Receivable for insurance claims in excess of deductibles (1,975) 1,558
Other assets 21,687 21,503
Accounts payable (20,607) 62,276
Contract liabilities 22,294 3,941
Accrued self-insurance (402) (1,119)
Other liabilities 21,519 12,070
Net cash flows provided by operating activities 65,996 28,392
Cash flows from investing activities:    
Proceeds from sale of property and equipment 6,815 3,998
Purchases of property and equipment (63,634) (63,791)
Net cash flows used in investing activities (56,819) (59,793)
Cash flows from financing activities:    
Borrowings under revolving lines of credit 584,070 354,467
Repayments under revolving lines of credit (520,076) (328,085)
Payment of principal obligations under equipment notes (7,049) (4,597)
Payment of principal obligations under finance leases (2,083) (872)
Proceeds from exercise of stock options 0 20
Repurchase of common stock (75,000) 0
Debt refinancing costs (34) (2,129)
Payments related to tax withholding for stock-based compensation (5,866) (7,936)
Net cash flows provided by (used in) financing activities (26,038) 10,868
Effect of exchange rate changes on cash (469) (36)
Net decrease in cash and cash equivalents (17,330) (20,569)
Cash and cash equivalents:    
Beginning of period 24,899 51,040
End of period $ 7,569 $ 30,471