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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2018 | Jun. 30, 2017
Cash flows from operating activities: |  |
Net income | $ 12,479 | $ 2,430
Adjustments to reconcile net income to net cash flows provided by operating activities: |  |
Depreciation and amortization of property and equipment | 18,590 | 19,055
Amortization of intangible assets | 236 | 398
Stock-based compensation expense | 1,478 | 2,560
Deferred income taxes | 323 | (209)
Gain on sale of property and equipment | (2,065) | (2,026)
Other non-cash items | 354 | (289)
Changes in operating assets and liabilities |  |
Accounts receivable, net | 1,950 | 13,346
Costs and estimated earnings in excess of billings on uncompleted contracts | (9,350) | (22,707)
Receivable for insurance claims in excess of deductibles | (330) | (99)
Other assets | 2,144 | (626)
Accounts payable | (9,845) | 15,357
Billings in excess of costs and estimated earnings on uncompleted contracts | 19,564 | (445)
Accrued self insurance | (239) | 2,745
Other liabilities | 9,977 | (10,310)
Net cash flows provided by operating activities | 45,266 | 19,180
Cash flows from investing activities: |  |
Proceeds from sale of property and equipment | 2,426 | 2,466
Purchases of property and equipment | (28,019) | (20,598)
Net cash flows used in investing activities | (25,593) | (18,132)
Cash flows from financing activities: |  |
Net repayments under revolving lines of credit | (21,156) | (14,193)
Payment of principal obligations under capital leases | (545) | (516)
Proceeds from exercise of stock options | 1,887 | 1,134
Repurchase of common shares | (951) | (2,208)
Other financing activities | 10 | 28
Net cash flows used in financing activities | (20,755) | (15,755)
Effect of exchange rate changes on cash | (58) | 887
Net decrease in cash and cash equivalents | (1,140) | (13,820)
Cash and cash equivalents: |  |
Beginning of period | 5,343 | 23,846
End of period | $ 4,203 | $ 10,026

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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
Name: | us-gaap_ShareBasedCompensation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration