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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Cash flows from operating activities:    
Net income $ 6,960 $ 6,210
Adjustments to reconcile net income to net cash flows provided by (used in) operating activities -    
Depreciation and amortization of property and equipment 6,879 5,700
Amortization of intangible assets 84 84
Stock-based compensation expense 751 694
Gain on sale of property and equipment (178) (127)
Other non-cash items 34 34
Changes in operating assets and liabilities    
Accounts receivable, net 7,892 (28,418)
Costs and estimated earnings in excess of billings on uncompleted contracts 18,499 (10,179)
Construction materials inventory   2,461
Receivable for insurance claims in excess of deductibles 38 180
Other assets 339 590
Accounts payable (23,646) 6,177
Billings in excess of costs and estimated earnings on uncompleted contracts (349) 3,805
Accrued self insurance (38) (647)
Other liabilities (4,771) 1,428
Net cash flows provided by (used in) operating activities 12,494 (12,008)
Cash flows from investing activities:    
Proceeds from sale of property and equipment 178 140
Purchases of property and equipment (12,458) (8,330)
Net cash flows used in investing activities (12,280) (8,190)
Cash flows from financing activities:    
Net borrowings (repayments) on revolving credit facility   (10,000)
Employee stock option and restricted stock transactions 679 (74)
Excess tax benefit from stock-based awards 563 20
Debt issuance costs   (11)
Net cash flows provided by (used in) financing activities 1,242 (10,065)
Net increase (decrease) in cash and cash equivalents 1,456 (30,263)
Cash and cash equivalents:    
Beginning of period 19,825 34,013
End of period $ 21,281 $ 3,750