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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017
Cash flows from operating activities: |  |
Net income | $ 20,436 | $ 7,575
Adjustments to reconcile net income to net cash flows provided by (used in) operating activities: |  |
Depreciation and amortization of property and equipment | 28,151 | 28,906
Amortization of intangible assets | 979 | 593
Stock-based compensation expense | 2,480 | 3,479
Deferred income taxes | 342 | (302)
Gain on sale of property and equipment | (2,869) | (2,602)
Other non-cash items | 697 | 1,113
Changes in operating assets and liabilities |  |
Accounts receivable, net | 24,519 | (37,059)
Costs and estimated earnings in excess of billings on uncompleted contracts | (35,466) | (36,980)
Receivable for insurance claims in excess of deductibles | (3,766) | (292)
Other assets | 2,929 | 85
Accounts payable | (13,781) | 14,803
Billings in excess of costs and estimated earnings on uncompleted contracts | 10,918 | 1,363
Accrued self insurance | 3,668 | 2,626
Other liabilities | 19,432 | (5,098)
Net cash flows provided by (used in) operating activities | 58,669 | (21,790)
Cash flows from investing activities: |  |
Proceeds from sale of property and equipment | 3,505 | 2,802
Cash paid for acquired business | (47,082) | 0
Purchases of property and equipment | (39,723) | (24,909)
Net cash flows used in investing activities | (83,300) | (22,107)
Cash flows from financing activities: |  |
Net borrowings (repayments) under revolving lines of credit | (14,580) | 20,427
Borrowings under equipment notes | 24,934 | 0
Payment of principal obligations under capital leases | (809) | (812)
Proceeds from exercise of stock options | 1,887 | 1,147
Repurchase of common shares | (1,043) | (3,058)
Other financing activities | 9,223 | 3,718
Net cash flows provided by financing activities | 19,612 | 21,422
Effect of exchange rate changes on cash | (24) | 311
Net decrease in cash and cash equivalents | (5,043) | (22,164)
Cash and cash equivalents: |  |
Beginning of period | 5,343 | 23,846
End of period | $ 300 | $ 1,682

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- Definition Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109197908&loc=SL79508275-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
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Balance Type: | debit
Period Type: | duration

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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Balance Type: | credit
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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Data Type: | xbrli:monetaryItemType
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