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UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2022 | Jun. 30, 2021
Cash flows from operating activities: |  |
Net income | $ 40,372 | $ 41,147
Adjustments to reconcile net income to net cash flows provided by operating activities: |  |
Depreciation and amortization of property and equipment | 24,043 | 22,172
Amortization of intangible assets | 6,020 | 1,156
Stock-based compensation expense | 3,688 | 3,435
Deferred income taxes | (1) | 481
Gain on sale of property and equipment | (1,400) | (1,794)
Other non-cash items | 581 | 1,370
Changes in operating assets and liabilities, net of acquisition: |  |
Accounts receivable, net | (20,457) | (10,098)
Contract assets, net | (43,413) | (10,855)
Receivable for insurance claims in excess of deductibles | 12,504 | 304
Other assets | (4,939) | 10,389
Accounts payable | 42,763 | 47,772
Contract liabilities | 33,619 | (21,433)
Accrued self-insurance | (11,861) | 1,869
Other liabilities | (21,400) | 2,647
Net cash flows provided by operating activities | 60,119 | 88,562
Cash flows from investing activities: |  |
Proceeds from sale of property and equipment | 1,237 | 1,637
Cash paid for acquired business, net of cash acquired | (110,576) | 0
Purchases of property and equipment | (30,421) | (20,997)
Net cash flows used in investing activities | (139,760) | (19,360)
Cash flows from financing activities: |  |
Net borrowings under revolving lines of credit | 51,395 | 0
Payment of principal obligations under equipment notes | (516) | (20,635)
Payment of principal obligations under finance leases | (880) | (376)
Proceeds from exercise of stock options | 4 | 429
Repurchase of common stock | (23,467) | 0
Payments related to tax withholding for stock-based compensation | (6,791) | (3,352)
Other financing activities | 607 | 12
Net cash flows provided by (used in) financing activities | 20,352 | (23,922)
Effect of exchange rate changes on cash | (746) | 374
Net increase (decrease) in cash and cash equivalents | (60,035) | 45,654
Cash and cash equivalents: |  |
Beginning of period | 82,092 | 22,668
End of period | $ 22,057 | $ 68,322

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