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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Cash flows from operating activities: |  |  |
Net income | $ 21,154 | $ 21,431 | $ 27,302
Adjustments to reconcile net income to net cash flows provided by (used in) operating activities - |  |  |
Depreciation and amortization of property and equipment | 38,077 | 38,236 | 37,458
Amortization of intangible assets | 499 | 886 | 571
Stock-based compensation expense | 4,376 | 4,674 | 4,837
Deferred income taxes | (5,091) | 4,205 | 1,558
Gain on sale of property and equipment | (3,664) | (1,341) | (2,257)
Other non-cash items | 1,194 | 194 | 200
Changes in operating assets and liabilities, net of acquisitions |  |  |
Accounts receivable, net | (46,190) | (27,485) | (17,765)
Costs and estimated earnings in excess of billings on uncompleted contracts | (7,611) | (17,001) | (4,597)
Receivable for insurance claims in excess of deductibles | (39) | (7,187) | 1,021
Other assets | (2,213) | 3,730 | (5,634)
Accounts payable | 8,149 | 17,322 | 6,742
Billings in excess of costs and estimated earnings on uncompleted contracts | (13,502) | (707) | 1,003
Accrued self-insurance | 2,765 | 5,617 | (2,616)
Other liabilities | (7,102) | 11,916 | (4,823)
Net cash flows provided by (used in) operating activities | (9,198) | 54,490 | 43,000
Cash flows from investing activities: |  |  |
Proceeds from sale of property and equipment | 4,342 | 3,299 | 2,758
Cash paid for acquisitions, net of cash acquired | 0 | (12,056) | (13,087)
Purchases of property and equipment | (30,843) | (25,371) | (46,599)
Net cash flows used in investing activities | (26,501) | (34,128) | (56,928)
Cash flows from financing activities: |  |  |
Net borrowings under revolving lines of credit | 19,890 | 59,070 | 0
Payment of principal obligations under capital leases | (1,203) | (740) | 0
Proceeds from exercise of stock options | 1,232 | 6,218 | 1,923
Repurchase of common shares | (3,058) | (101,483) | (27,582)
Other financing activities | 28 | 1,396 | 1,748
Net cash flows provided by (used in) financing activities | 16,889 | (35,539) | (23,911)
Effect of exchange rate changes on cash | 307 | (774) | 0
Net decrease in cash and cash equivalents | (18,503) | (15,951) | (37,839)
Cash and cash equivalents: |  |  |
Beginning of period | 23,846 | 39,797 | 77,636
End of period | 5,343 | 23,846 | 39,797
Supplemental Cash Flow Information: |  |  |
Income taxes payments | 6,597 | 6,274 | 16,960
Interest payments | 2,259 | 1,114 | 591
Noncash investing activities: |  |  |
Acquisition of property and equipment for which payment is pending | 2,050 | 614 | 1,328
Acquisition of property under capital lease arrangements | 0 | 5,658 | 0
Noncash financing activities: |  |  |
Capital lease obligations initiated | 0 | 5,658 | 0
Share repurchases that have not settled | $ 0 | $ 0 | $ 896

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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=98514028&loc=d3e3291-108585 + 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=98514028&loc=d3e3213-108585 + 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 -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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- Definition Amount of cash inflow (outflow) from financing activities classified as other. + References Reference 1: 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=98514028&loc=d3e3095-108585 Reference 2: 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=98514028&loc=d3e3098-108585 + Details
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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=98514028&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=98514028&loc=d3e3179-108585 + Details
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- Definition Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement. + References Reference 1: 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=98514028&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=96867065&loc=SL79508275-113901 + Details
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- Definition The cash outflow for the obligation for a lease meeting the criteria for capitalization (with maturities exceeding one year or beyond the operating cycle of the entity, 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=98514028&loc=d3e3291-108585 + 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=98514028&loc=d3e3602-108585 + Details
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- References No definition available. + Details
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