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UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2020 | Jun. 30, 2019
Cash flows from operating activities: |  |
Net income | $ 23,317 | $ 12,978
Adjustments to reconcile net income to net cash flows provided by operating activities: |  |
Depreciation and amortization of property and equipment | 21,324 | 19,714
Amortization of intangible assets | 2,431 | 1,469
Stock-based compensation expense | 2,173 | 2,153
Deferred income taxes | 537 | 23
Gain on sale of property and equipment | (1,489) | (1,397)
Other non-cash items | 267 | 783
Changes in operating assets and liabilities, net of acquisitions: |  |
Accounts receivable, net | 46,353 | (24,468)
Contract assets, net | (7,658) | (14,218)
Receivable for insurance claims in excess of deductibles | 4,934 | 568
Other assets | 7,198 | (3,552)
Accounts payable | (38,342) | 27,242
Contract liabilities | 23,271 | (5,035)
Accrued self insurance | (5,843) | (692)
Other liabilities | 19,450 | (8,169)
Net cash flows provided by operating activities | 97,923 | 7,399
Cash flows from investing activities: |  |
Proceeds from sale of property and equipment | 1,633 | 1,658
Purchases of property and equipment | (16,938) | (27,961)
Net cash flows used in investing activities | (15,305) | (26,303)
Cash flows from financing activities: |  |
Net repayments under revolving lines of credit | (70,423) | (5,896)
Borrowings under equipment notes | 0 | 24,038
Payment of principal obligations under equipment notes | (13,433) | (1,455)
Payment of principal obligations under finance leases | (616) | (575)
Proceeds from exercise of stock options | 82 | 284
Repurchase of common shares | (425) | (778)
Other financing activities | 49 | 36
Net cash flows provided by (used in) financing activities | (84,766) | 15,654
Effect of exchange rate changes on cash | (258) | 98
Net decrease in cash and cash equivalents | (2,406) | (3,152)
Cash and cash equivalents: |  |
Beginning of period | 12,397 | 7,507
End of period | $ 9,991 | $ 4,355

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