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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Cash flows from operating activities:    
Net income $ 20,436 $ 7,575
Adjustments to reconcile net income to net cash flows provided by (used in) operating activities:    
Depreciation and amortization of property and equipment 28,151 28,906
Amortization of intangible assets 979 593
Stock-based compensation expense 2,480 3,479
Deferred income taxes 342 (302)
Gain on sale of property and equipment (2,869) (2,602)
Other non-cash items 697 1,113
Changes in operating assets and liabilities    
Accounts receivable, net 24,519 (37,059)
Costs and estimated earnings in excess of billings on uncompleted contracts (35,466) (36,980)
Receivable for insurance claims in excess of deductibles (3,766) (292)
Other assets 2,929 85
Accounts payable (13,781) 14,803
Billings in excess of costs and estimated earnings on uncompleted contracts 10,918 1,363
Accrued self insurance 3,668 2,626
Other liabilities 19,432 (5,098)
Net cash flows provided by (used in) operating activities 58,669 (21,790)
Cash flows from investing activities:    
Proceeds from sale of property and equipment 3,505 2,802
Cash paid for acquired business (47,082) 0
Purchases of property and equipment (39,723) (24,909)
Net cash flows used in investing activities (83,300) (22,107)
Cash flows from financing activities:    
Net borrowings (repayments) under revolving lines of credit (14,580) 20,427
Borrowings under equipment notes 24,934 0
Payment of principal obligations under capital leases (809) (812)
Proceeds from exercise of stock options 1,887 1,147
Repurchase of common shares (1,043) (3,058)
Other financing activities 9,223 3,718
Net cash flows provided by financing activities 19,612 21,422
Effect of exchange rate changes on cash (24) 311
Net decrease in cash and cash equivalents (5,043) (22,164)
Cash and cash equivalents:    
Beginning of period 5,343 23,846
End of period $ 300 $ 1,682