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UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Cash flows from operating activities:    
Net income $ 19,928 $ 9,932
Adjustments to reconcile net income to net cash flows provided by operating activities:    
Depreciation and amortization of property and equipment 11,293 10,641
Amortization of intangible assets 578 1,228
Stock-based compensation expense 1,487 1,080
Deferred income taxes (47) 236
Gain on sale of property and equipment (683) (1,050)
Other non-cash items 529 (305)
Changes in operating assets and liabilities, net of acquisitions:    
Accounts receivable, net 12,592 38,089
Contract assets, net (6,991) (7,467)
Receivable for insurance claims in excess of deductibles 802 (754)
Other assets 15,314 5,195
Accounts payable 29,198 (18,091)
Contract liabilities (18,087) (4,697)
Accrued self insurance (285) (77)
Other liabilities (6,238) 1,283
Net cash flows provided by operating activities 59,390 35,243
Cash flows from investing activities:    
Proceeds from sale of property and equipment 651 870
Purchases of property and equipment (7,031) (9,138)
Net cash flows used in investing activities (6,380) (8,268)
Cash flows from financing activities:    
Net repayments under revolving lines of credit 0 (2,263)
Payment of principal obligations under equipment notes 0 (2,177)
Payment of principal obligations under finance leases (273) (312)
Proceeds from exercise of stock options 110 82
Repurchase of common shares (2,618) (425)
Other financing activities 12 23
Net cash flows used in financing activities (2,769) (5,072)
Effect of exchange rate changes on cash 160 (303)
Net increase in cash and cash equivalents 50,401 21,600
Cash and cash equivalents:    
Beginning of period 22,668 12,397
End of period $ 73,069 $ 33,997