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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Cash flows from operating activities:    
Net income $ 6,272 $ 6,960
Adjustments to reconcile net income to net cash flows provided by (used in) operating activities    
Depreciation and amortization of property and equipment 7,950 6,879
Amortization of intangible assets 84 84
Stock-based compensation expense 833 751
Gain on sale of property and equipment (11) (178)
Other non-cash items 35 34
Changes in operating assets and liabilities    
Accounts receivable, net 124 7,892
Costs and estimated earnings in excess of billings on uncompleted contracts (7,118) 18,499
Receivable for insurance claims in excess of deductibles (695) 38
Other assets 1,076 339
Accounts payable (14,195) (23,646)
Billings in excess of costs and estimated earnings on uncompleted contracts (4,200) (349)
Accrued self insurance 623 (38)
Other liabilities 255 (4,771)
Net cash flows provided by (used in) operating activities (8,967) 12,494
Cash flows from investing activities:    
Proceeds from sale of property and equipment 42 178
Purchases of property and equipment (12,441) (12,458)
Net cash flows used in investing activities (12,399) (12,280)
Cash flows from financing activities:    
Employee stock option and restricted stock transactions (824) 679
Excess tax benefit from stock-based awards 111 563
Net cash flows provided by (used in) financing activities (713) 1,242
Net increase (decrease) in cash and cash equivalents (22,079) 1,456
Cash and cash equivalents:    
Beginning of period 76,454 19,825
End of period $ 54,375 $ 21,281