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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Cash flows from operating activities:      
Net income $ 30,263 $ 90,990 $ 83,381
Adjustments to reconcile net income to net cash flows provided by operating activities:      
Depreciation and amortization of property and equipment 60,320 54,231 49,161
Amortization of intangible assets 4,869 4,907 9,009
Stock-based compensation expense 8,532 8,376 7,922
Deferred income taxes (400) 2,056 9,573
Gain on sale of property and equipment (6,854) (4,214) (2,378)
Other non-cash items 1,459 96 2,294
Changes in operating assets and liabilities:      
Accounts receivable, net (134,476) (48,527) (86,939)
Contract assets, net 114,776 (119,246) (64,421)
Receivable for insurance claims in excess of deductibles (1,628) 1,529 (14)
Prepaid expenses and other assets 10,270 560 1,640
Accounts payable (60,962) 37,250 109,008
Contract liabilities 82,557 13,151 58,001
Accrued self-insurance (548) 17 4,999
Other liabilities (21,063) 29,840 (13,752)
Net cash flows provided by operating activities 87,115 71,016 167,484
Cash flows from investing activities:      
Proceeds from sale of property and equipment 8,726 5,608 1,990
Cash paid for acquisitions, net of cash acquired 0 0 (110,660)
Purchases of property and equipment (75,938) (84,736) (77,056)
Net cash flows used in investing activities (67,212) (79,128) (185,726)
Cash flows from financing activities:      
Borrowings under revolving lines of credit 822,491 562,901 198,697
Repayments under revolving lines of credit (777,297) (562,615) (185,782)
Payment of principal obligations under equipment notes (7,054) (4,598) (1,047)
Payment of principal obligations under finance leases (1,196) (1,143) (1,592)
Borrowings under equipment notes 0 0 24,184
Proceeds from exercise of stock options 0 20 40
Debt refinancing costs (33) (2,129) 0
Repurchase of common stock (75,000) (2,868) (36,981)
Payments related to tax withholding for stock-based compensation (5,866) (7,936) (6,791)
Other financing activities 3,998 0 0
Net cash flows used in financing activities (39,957) (18,368) (9,272)
Effect of exchange rate changes on cash (1,381) 339 (3,538)
Net decrease in cash and cash equivalents (21,435) (26,141) (31,052)
Cash and cash equivalents:      
Beginning of period 24,899 51,040 82,092
End of period 3,464 24,899 51,040
Cash paid during the period for:      
Income taxes payments 15,075 23,949 20,462
Interest payments 5,767 4,145 2,736
Noncash investing activities:      
Acquisition of property and equipment for which payment is pending $ 3,373 $ 8,474 $ 2,218