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UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018
Cash flows from operating activities: |  |
Net income | $ 23,439 | $ 20,438
Adjustments to reconcile net income to net cash flows provided by operating activities: |  |
Depreciation and amortization of property and equipment | 30,153 | 28,151
Amortization of intangible assets | 2,888 | 979
Stock-based compensation expense | 3,261 | 2,480
Deferred income taxes | 339 | 342
Gain on sale of property and equipment | (2,548) | (2,869)
Other non-cash items | 631 | 697
Changes in operating assets and liabilities, net of acquisitions: |  |
Accounts receivable, net | (27,327) | 29,232
Contract assets | (38,910) | (40,179)
Receivable for insurance claims in excess of deductibles | 1,626 | (3,766)
Other assets | (771) | 2,928
Accounts payable | 37,874 | (13,781)
Contract liabilities | (397) | 8,681
Accrued self insurance | (358) | 3,668
Other liabilities | 1,845 | 21,668
Net cash flows provided by operating activities | 31,745 | 58,669
Cash flows from investing activities: |  |
Proceeds from sale of property and equipment | 2,898 | 3,505
Cash paid for acquired business | (79,720) | (47,082)
Purchases of property and equipment | (39,354) | (39,723)
Net cash flows used in investing activities | (116,176) | (83,300)
Cash flows from financing activities: |  |
Net borrowings (repayments) under revolving lines of credit | 67,668 | (14,580)
Borrowings under equipment notes | 24,037 | 24,934
Payment of principal obligations under equipment notes | (3,307) | 0
Payment of principal obligations under finance leases | (857) | (809)
Proceeds from exercise of stock options | 325 | 1,887
Debt refinancing costs | (1,132) | 0
Repurchase of common shares | (778) | (1,043)
Other financing activities | 60 | 9,223
Net cash flows provided by financing activities | 86,016 | 19,612
Effect of exchange rate changes on cash | 53 | (24)
Net increase (decrease) in cash and cash equivalents | 1,638 | (5,043)
Cash and cash equivalents: |  |
Beginning of period | 7,507 | 5,343
End of period | $ 9,145 | $ 300

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations 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 (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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