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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Cash flows from operating activities: |  |  |  |
Net income | $ 8,315 | $ 8,746 | $ 24,737 | $ 24,491
Adjustments to reconcile net income to net cash flows provided by operating activities - |  |  |  |
Depreciation and amortization of property and equipment | 7,258 | 6,420 | 21,203 | 18,167
Amortization of intangible assets | 84 | 84 | 251 | 251
Stock-based compensation expense | 893 | 688 | 2,551 | 2,029
Deferred income taxes | 400 | 197 | 400 | 197
Gain on sale of property and equipment | (256) | (387) | (770) | (707)
Other non-cash items | 39 | 35 | 114 | 103
Changes in operating assets and liabilities |  |  |  |
Accounts receivable, net | (3,448) | (10,269) | (13,907) | (37,529)
Costs and estimated earnings in excess of billings uncompleted contracts | (5,073) | (8,941) | 19,864 | (19,413)
Construction materials inventory |  |  |  | 4,003
Receivable for insurance claims in excess of deductibles | (192) | (1,401) | (90) | (1,160)
Other assets | (286) | 1,135 | 795 | 2,379
Accounts payable | 2,036 | 7,176 | (18,745) | 18,897
Billings in excess of costs and estimated earnings on uncompleted contracts | 18,030 | 1,202 | 34,429 | 5,120
Accrued self insurance | (478) | 1,291 | (390) | 779
Other liabilities | 6,201 | 6,617 | 1,051 | 5,133
Net cash flows provided by operating activities | 33,523 | 12,593 | 71,493 | 22,740
Cash flows from investing activities: |  |  |  |
Proceeds from sale of property and equipment | 368 | 513 | 914 | 877
Purchases of property and equipment | (9,622) | (11,665) | (31,540) | (32,094)
Net cash flows used in investing activities | (9,254) | (11,152) | (30,626) | (31,217)
Cash flows from financing activities: |  |  |  |
Net repayments on revolving credit facility |  | (10,000) |  | (10,000)
Employee stock option and restricted stock transactions | 653 | 719 | 1,175 | 864
Excess tax benefit from stock-based awards | 343 | 139 | 971 | 174
Debt issuance costs |  |  |  | (13)
Other financing activities |  |  | 56 | 38
Net cash flows provided by (used in) financing activities | 996 | (9,142) | 2,202 | (8,937)
Net increase (decrease) in cash and cash equivalents | 25,265 | (7,701) | 43,069 | (17,414)
Cash and cash equivalents: |  |  |  |
Beginning of period | 37,629 | 24,300 | 19,825 | 34,013
End of period | $ 62,894 | $ 16,599 | $ 62,894 | $ 16,599

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