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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Cash flows from operating activities:    
Net income $ 5,644 $ 1,200
Adjustments to reconcile net income to net cash flows provided by operating activities:    
Depreciation and amortization of property and equipment 9,275 9,558
Amortization of intangible assets 117 188
Stock-based compensation expense 420 867
Deferred income taxes 48 (143)
Gain on sale of property and equipment (1,051) (707)
Other non-cash items 702 (93)
Changes in operating assets and liabilities    
Accounts receivable, net 26,041 12,417
Costs and estimated earnings in excess of billings on uncompleted contracts (15,131) (2,847)
Receivable for insurance claims in excess of deductibles (290) (47)
Other assets 1,405 (289)
Accounts payable (3,765) (10,333)
Billings in excess of costs and estimated earnings on uncompleted contracts (10,191) 7,134
Accrued self insurance (857) 1,834
Other liabilities 9,666 (5,679)
Net cash flows provided by operating activities 22,033 13,060
Cash flows from investing activities:    
Proceeds from sale of property and equipment 1,074 937
Purchases of property and equipment (14,497) (10,002)
Net cash flows used in investing activities (13,423) (9,065)
Cash flows from financing activities:    
Net repayments under revolving lines of credit (11,579) (19,491)
Payment of principal obligations under capital leases (272) (268)
Proceeds from exercise of stock options 582 911
Repurchase of common shares (934) (2,208)
Net cash flows used in financing activities (12,203) (21,056)
Effect of exchange rate changes on cash (31) 154
Net decrease in cash and cash equivalents (3,624) (16,907)
Cash and cash equivalents:    
Beginning of period 5,343 23,846
End of period $ 1,719 $ 6,939