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UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Cash flows from operating activities:    
Net income $ 9,932 $ 6,620
Adjustments to reconcile net income to net cash flows provided by (used in) operating activities:    
Depreciation and amortization of property and equipment 10,641 9,815
Amortization of intangible assets 1,228 734
Stock-based compensation expense 1,080 951
Deferred income taxes 236 (315)
Gain on sale of property and equipment (1,050) (471)
Other non-cash items (305) (56)
Changes in operating assets and liabilities, net of acquisitions:    
Accounts receivable, net 38,089 (9,380)
Contract assets, net (7,467) (27,615)
Receivable for insurance claims in excess of deductibles (754) 1,178
Other assets 5,195 (849)
Accounts payable (18,091) 38,220
Contract liabilities (4,697) (30,033)
Accrued self-insurance (77) (580)
Other liabilities 1,283 3,576
Net cash flows provided by (used in) operating activities 35,243 (8,205)
Cash flows from investing activities:    
Proceeds from sale of property and equipment 870 832
Purchases of property and equipment (9,138) (9,911)
Net cash flows used in investing activities (8,268) (9,079)
Cash flows from financing activities:    
Net borrowings (repayments) under revolving lines of credit (2,263) 21,609
Payment of principal obligations under equipment notes (2,177) (1,455)
Payment of principal obligations under finance leases (312) (230)
Proceeds from exercise of stock options 82 282
Repurchase of common shares (425) (778)
Other financing activities 23 (8,364)
Net cash flows provided by (used in) financing activities (5,072) 11,064
Effect of exchange rate changes on cash (303) 51
Net increase (decrease) in cash and cash equivalents 21,600 (6,169)
Cash and cash equivalents:    
Beginning of period 12,397 7,507
End of period $ 33,997 $ 1,338