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UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Cash flows from operating activities:    
Net income (loss) $ 3,662 $ 45,436
Adjustments to reconcile net income to net cash flows provided by operating activities:    
Depreciation and amortization of property and equipment 29,659 26,040
Amortization of intangible assets 2,445 2,455
Stock-based compensation expense 4,248 4,304
Gain on sale of property and equipment (2,995) (2,539)
Other non-cash items 1,266 (221)
Changes in operating assets and liabilities:    
Accounts receivable, net (34,139) (1,714)
Contract assets, net 17,057 (81,243)
Receivable for insurance claims in excess of deductibles (30) 459
Other assets (3,507) 3,147
Accounts payable (10,336) 23,004
Contract liabilities 16,514 1,468
Accrued self-insurance (4,161) (1,962)
Other liabilities 10,688 (2,790)
Net cash flows provided by operating activities 30,371 15,844
Cash flows from investing activities:    
Proceeds from sale of property and equipment 3,380 3,331
Purchases of property and equipment (45,961) (41,730)
Net cash flows used in investing activities (42,581) (38,399)
Cash flows from financing activities:    
Borrowings under revolving lines of credit 290,907 185,330
Repayments under revolving lines of credit (279,488) (178,247)
Payment of principal obligations under equipment notes (2,595) (2,512)
Payment of principal obligations under finance leases (549) (584)
Proceeds from exercise of stock options 0 20
Repurchase of common stock (14,251) 0
Debt refinancing costs (33) (2,120)
Payments related to tax withholding for stock-based compensation (5,866) (7,936)
Other financing activities 1,600 0
Net cash flows used in financing activities (10,275) (6,049)
Effect of exchange rate changes on cash (545) 414
Net decrease in cash and cash equivalents (23,030) (28,190)
Cash and cash equivalents:    
Beginning of period 24,899 51,040
End of period 1,869 22,850
Noncash financing activities:    
Share repurchases not settled $ 2,008 $ 0