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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Cash flows from operating activities:    
Net income $ 15,246 $ 14,013
Adjustments to reconcile net income to net cash flows provided by operating activities —    
Depreciation and amortization of property and equipment 18,152 16,103
Amortization of intangible assets 167 167
Stock-based compensation expense 2,716 2,197
Deferred income taxes (101) (41)
Gain on sale of property and equipment (1,217) (71)
Other non-cash items 89 47
Changes in operating assets and liabilities    
Accounts receivable, net (7,683) (3,554)
Costs and estimated earnings in excess of billings on uncompleted contracts (30,998) (15,717)
Receivable for insurance claims in excess of deductibles 839 (1,350)
Other assets (3,053) 206
Accounts payable 20,688 (6,991)
Billings in excess of costs and estimated earnings on uncompleted contracts (3,481) 448
Accrued self insurance (2,774) 1,158
Other liabilities 439 (2,318)
Net cash flows provided by operating activities 9,029 4,297
Cash flows from investing activities:    
Proceeds from sale of property and equipment 1,326 182
Cash paid for acquired business (11,374) 0
Purchases of property and equipment (29,731) (25,234)
Net cash flows used in investing activities (39,779) (25,052)
Cash flows from financing activities:    
Proceeds from exercise of stock options 1,519 135
Excess tax benefit from stock-based awards 1,620 230
Repurchase of common shares (3,169) (1,550)
Other financing activities 28 38
Net cash flows used in financing activities (2) (1,147)
Net decrease in cash and cash equivalents (30,752) (21,902)
Cash and cash equivalents:    
Beginning of period 77,636 76,454
End of period $ 46,884 $ 54,552