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UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Cash flows from operating activities:    
Net income $ 7,487 $ 15,246
Adjustments to reconcile net income to net cash flows provided by operating activities —    
Depreciation and amortization of property and equipment 19,187 18,152
Amortization of intangible assets 503 167
Stock-based compensation expense 2,439 2,716
Deferred income taxes (27) (101)
Gain on sale of property and equipment (612) (1,217)
Other non-cash items 75 89
Changes in operating assets and liabilities    
Accounts receivable, net 25,313 (7,683)
Costs and estimated earnings in excess of billings on uncompleted contracts (15,619) (30,998)
Receivable for insurance claims in excess of deductibles (1,709) 839
Other assets (560) (3,053)
Accounts payable 5,160 20,688
Billings in excess of costs and estimated earnings on uncompleted contracts 3,462 (3,481)
Accrued self insurance 814 (2,774)
Other liabilities 549 439
Net cash flows provided by operating activities 46,462 9,029
Cash flows from investing activities:    
Proceeds from sale of property and equipment 1,843 1,326
Cash paid for acquired business 0 (11,374)
Purchases of property and equipment (12,237) (29,731)
Net cash flows used in investing activities (10,394) (39,779)
Cash flows from financing activities:    
Net borrowings under revolving lines of credit 20,000 0
Payment of principal obligations under capital leases (144) 0
Proceeds from exercise of stock options 1,116 1,519
Debt issuance costs (874) 0
Excess tax benefit from stock-based awards 237 1,620
Repurchase of common shares (92,958) (3,169)
Other financing activities 63 28
Net cash flows used in financing activities (72,560) (2)
Effect of exchange rate changes on cash 58 0
Net decrease in cash and cash equivalents (36,434) (30,752)
Cash and cash equivalents:    
Beginning of period 39,797 77,636
End of period 3,363 46,884
Noncash investing activities:    
Acquisition of property and equipment acquired under capital lease arrangements 4,697 0
Noncash financing activities:    
Share repurchases not settled 3,037 0
Capital lease obligations initiated $ 4,697 $ 0