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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Cash flows from operating activities:    
Net income $ 21,421 $ 22,417
Adjustments to reconcile net income to net cash flows provided by operating activities —    
Depreciation and amortization of property and equipment 27,767 24,551
Amortization of intangible assets 251 250
Stock-based compensation expense 3,843 3,271
Deferred income taxes (186) 1,407
Gain on sale of property and equipment (1,574) (119)
Other non-cash items 175 95
Changes in operating assets and liabilities    
Accounts receivable, net (24,301) 13,062
Costs and estimated earnings in excess of billings on uncompleted contracts (31,319) (20,859)
Receivable for insurance claims in excess of deductibles 920 (484)
Other assets (1,234) 2,439
Accounts payable 17,014 (11,162)
Billings in excess of costs and estimated earnings on uncompleted contracts 6,079 (4,484)
Accrued self insurance (3,387) 308
Other liabilities (4,774) 2,932
Net cash flows provided by operating activities 10,695 33,624
Cash flows from investing activities:    
Proceeds from sale of property and equipment 1,980 230
Cash paid for acquired business (11,374) 0
Purchases of property and equipment (42,795) (35,992)
Net cash flows used in investing activities (52,189) (35,762)
Cash flows from financing activities:    
Proceeds from exercise of stock options 1,823 450
Excess tax benefit from stock-based awards 1,676 390
Repurchase of common shares (9,240) (10,585)
Other financing activities 28 38
Net cash flows used in financing activities (5,713) (9,707)
Net decrease in cash and cash equivalents (47,207) (11,845)
Cash and cash equivalents:    
Beginning of period 77,636 76,454
End of period $ 30,429 $ 64,609