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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash flows from operating activities:    
Net income $ 12,479 $ 2,430
Adjustments to reconcile net income to net cash flows provided by operating activities:    
Depreciation and amortization of property and equipment 18,590 19,055
Amortization of intangible assets 236 398
Stock-based compensation expense 1,478 2,560
Deferred income taxes 323 (209)
Gain on sale of property and equipment (2,065) (2,026)
Other non-cash items 354 (289)
Changes in operating assets and liabilities    
Accounts receivable, net 1,950 13,346
Costs and estimated earnings in excess of billings on uncompleted contracts (9,350) (22,707)
Receivable for insurance claims in excess of deductibles (330) (99)
Other assets 2,144 (626)
Accounts payable (9,845) 15,357
Billings in excess of costs and estimated earnings on uncompleted contracts 19,564 (445)
Accrued self insurance (239) 2,745
Other liabilities 9,977 (10,310)
Net cash flows provided by operating activities 45,266 19,180
Cash flows from investing activities:    
Proceeds from sale of property and equipment 2,426 2,466
Purchases of property and equipment (28,019) (20,598)
Net cash flows used in investing activities (25,593) (18,132)
Cash flows from financing activities:    
Net repayments under revolving lines of credit (21,156) (14,193)
Payment of principal obligations under capital leases (545) (516)
Proceeds from exercise of stock options 1,887 1,134
Repurchase of common shares (951) (2,208)
Other financing activities 10 28
Net cash flows used in financing activities (20,755) (15,755)
Effect of exchange rate changes on cash (58) 887
Net decrease in cash and cash equivalents (1,140) (13,820)
Cash and cash equivalents:    
Beginning of period 5,343 23,846
End of period $ 4,203 $ 10,026