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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Cash flows from operating activities: |  |  |
Net income | $ 34,759 | $ 34,262 | $ 18,298
Adjustments to reconcile net income to net cash flows provided by operating activities - |  |  |
Depreciation and amortization of property and equipment | 28,860 | 24,821 | 19,176
Amortization of intangible assets | 335 | 335 | 335
Stock-based compensation expense | 3,519 | 2,923 | 2,130
Deferred income taxes | 381 | 2,687 | (1,326)
Gain on sale of property and equipment | (893) | (1,019) | (1,174)
Other non-cash items | 151 | 110 | 44
Changes in operating assets and liabilities |  |  |
Accounts receivable, net | (6,227) | (40,330) | (19,739)
Costs and estimated earnings in excess of billings on uncompleted contracts | 21,254 | (18,079) | (14,395)
Construction materials inventory |  | 4,003 | (4,003)
Receivable for insurance claims in excess of deductibles | (10) | (1,257) | (1,700)
Other assets | (2,138) | (1,619) | 2,293
Accounts payable | (5,289) | 11,067 | 35,062
Billings in excess of costs and estimated earnings on uncompleted contracts | 20,363 | 7,644 | (20,560)
Accrued self insurance | (472) | 733 | 4,806
Other liabilities | 469 | 3,718 | 11,147
Net cash flows provided by operating activities | 95,062 | 29,999 | 30,394
Cash flows from investing activities: |  |  |
Proceeds from sale of property and equipment | 1,151 | 1,204 | 1,306
Purchases of property and equipment | (42,725) | (37,249) | (42,342)
Net cash flows used in investing activities | (41,574) | (36,045) | (41,036)
Cash flows from financing activities: |  |  |
Repayments on term loan |  |  | (30,000)
Net borrowings (repayments) on revolving credit facility |  | (10,000) | 10,000
Employee stock option transactions | 1,762 | 1,309 | 1,290
Excess tax benefit from stock-based awards | 1,323 | 524 | 1,266
Debt issuance costs |  | (13) | (569)
Other financing activities | 56 | 38 | 45
Net cash flows provided by (used in) financing activities | 3,141 | (8,142) | (17,968)
Net increase (decrease) in cash and cash equivalents | 56,629 | (14,188) | (28,610)
Cash and cash equivalents: |  |  |
Beginning of period | 19,825 | 34,013 | 62,623
End of period | $ 76,454 | $ 19,825 | $ 34,013

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- Definition The net cash inflow or cash outflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with either short term or long term maturity that is collateralized (backed by pledge, mortgage or other lien in the entity's assets). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -Subparagraph c -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3098-108585 + Details
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- Definition The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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