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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Cash flows from operating activities: |  |  |
Net income | $ 27,302 | $ 36,544 | $ 34,759
Adjustments to reconcile net income to net cash flows provided by operating activities - |  |  |
Depreciation and amortization of property and equipment | 37,458 | 33,089 | 28,860
Amortization of intangible assets | 571 | 334 | 335
Stock-based compensation expense | 4,837 | 4,671 | 3,519
Deferred income taxes | 1,558 | 3,655 | 381
Gain on sale of property and equipment | (2,257) | (142) | (893)
Other non-cash items | 200 | 139 | 151
Changes in operating assets and liabilities, net of acquisitions |  |  |
Accounts receivable, net | (17,765) | 15,706 | (6,227)
Costs and estimated earnings in excess of billings on uncompleted contracts | (4,597) | (4,090) | 21,254
Receivable for insurance claims in excess of deductibles | 1,021 | (922) | (10)
Other assets | (5,634) | (1,255) | (2,138)
Accounts payable | 6,742 | (17,303) | (5,289)
Billings in excess of costs and estimated earnings on uncompleted contracts | 1,003 | (14,831) | 20,363
Accrued self insurance | (2,616) | 369 | (472)
Other liabilities | (4,823) | (988) | 469
Net cash flows provided by operating activities | 43,000 | 54,976 | 95,062
Cash flows from investing activities: |  |  |
Proceeds from sale of property and equipment | 2,758 | 320 | 1,151
Cash paid for acquisitions, net of cash acquired | (13,087) | 0 | 0
Purchases of property and equipment | (46,599) | (39,045) | (42,725)
Net cash flows used in investing activities | (56,928) | (38,725) | (41,574)
Cash flows from financing activities: |  |  |
Proceeds from exercise of stock options | 1,923 | 725 | 2,304
Excess tax benefit from stock-based awards | 1,720 | 615 | 1,323
Repurchase of common shares | (27,582) | (16,447) | (542)
Other financing activities | 28 | 38 | 56
Net cash flows provided by (used in) financing activities | (23,911) | (15,069) | 3,141
Net increase (decrease) in cash and cash equivalents | (37,839) | 1,182 | 56,629
Cash and cash equivalents: |  |  |
Beginning of period | 77,636 | 76,454 | 19,825
End of period | 39,797 | 77,636 | 76,454
Supplemental Cash Flow Information: |  |  |
Income taxes payments | 16,960 | 17,403 | 18,115
Interest payments | 591 | 577 | 571
Noncash investing activities: |  |  |
Acquisition of property and equipment for which payment is pending | 1,328 | 749 | 804
Noncash financing activities: |  |  |
Share repurchases that have not settled | $ 896 | $ 0 | $ 0

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- Definition The cash outflow to reacquire common stock during the period. + 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 (a) -URI http://asc.fasb.org/extlink&oid=56944662&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 cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + 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 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585 + Details
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- Definition The net cash inflow or outflow from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3095-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=56944662&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 -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3255-108585 Reference 3: 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=56944662&loc=d3e3602-108585 + Details
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- References No definition available. + Details
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