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UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Cash flows from operating activities:    
Net income $ 58,808 $ 64,318
Adjustments to reconcile net income to net cash flows provided by operating activities:    
Depreciation and amortization of property and equipment 36,317 32,884
Amortization of intangible assets 6,847 1,734
Stock-based compensation expense 5,866 5,350
Deferred income taxes (1) 1,364
Gain on sale of property and equipment (1,747) (2,473)
Other non-cash items 3,230 1,171
Changes in operating assets and liabilities, net of acquisition:    
Accounts receivable, net (56,125) 23,929
Contract assets, net (74,775) (33,642)
Receivable for insurance claims in excess of deductibles (271) (5,273)
Other assets 23,326 (5,786)
Accounts payable 71,758 29,874
Contract liabilities 5,582 (8,515)
Accrued self-insurance 1,462 5,571
Other liabilities (6,551) (2,291)
Net cash flows provided by operating activities 73,726 108,215
Cash flows from investing activities:    
Proceeds from sale of property and equipment 1,649 2,489
Cash paid for acquired business, net of cash acquired (110,660) 0
Purchases of property and equipment (48,522) (32,701)
Net cash flows used in investing activities (157,533) (30,212)
Cash flows from financing activities:    
Net borrowings under revolving lines of credit 57,748 0
Borrowings under equipment notes 24,187 0
Payment of principal obligations under equipment notes (522) (24,409)
Payment of principal obligations under finance leases (1,272) (336)
Proceeds from exercise of stock options 30 483
Repurchase of common stock (31,654) 0
Payments related to tax withholding for stock-based compensation (6,791) (3,352)
Other financing activities 0 11
Net cash flows provided by (used in) financing activities 41,726 (27,603)
Effect of exchange rate changes on cash (4,244) (62)
Net increase (decrease) in cash and cash equivalents (46,325) 50,338
Cash and cash equivalents:    
Beginning of period 82,092 22,668
End of period 35,767 73,006
Noncash financing activities:    
Share repurchases not settled $ 1,712 $ 0