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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Cash flows from operating activities: |  |  |
Net income | $ 85,006 | $ 58,759 | $ 36,214
Adjustments to reconcile net income to net cash flows provided by operating activities: |  |  |
Depreciation and amortization of property and equipment | 43,894 | 42,867 | 40,667
Amortization of intangible assets | 2,311 | 3,586 | 3,849
Stock-based compensation expense | 7,496 | 5,688 | 4,403
Deferred income taxes | 6,281 | (2,641) | 3,602
Gain on sale of property and equipment | (3,098) | (2,813) | (3,543)
Other non-cash items | 1,892 | 1,951 | 1,029
Changes in operating assets and liabilities: |  |  |
Accounts receivable, net | 10,659 | 2,903 | (39,710)
Contract assets, net | (39,266) | 31,360 | (16,443)
Receivable for insurance claims in excess of deductibles | (4,619) | (1,511) | (9,646)
Prepaid expenses and other assets | (25,320) | (15,458) | (10,327)
Accounts payable | 34,348 | (43,079) | 22,492
Contract liabilities | 9,573 | 52,918 | 28,163
Accrued self-insurance | 5,233 | 3,010 | 12,755
Other liabilities | 2,838 | 37,627 | (8,606)
Net cash flows provided by operating activities | 137,228 | 175,167 | 64,899
Cash flows from investing activities: |  |  |
Proceeds from sale of property and equipment | 3,062 | 3,429 | 4,051
Cash paid for acquisitions, net of cash acquired | 0 | 0 | (79,720)
Purchases of property and equipment | (52,361) | (44,355) | (57,828)
Net cash flows used in investing activities | (49,299) | (40,926) | (133,497)
Cash flows from financing activities: |  |  |
Net borrowings (repayments) under revolving lines of credit | 0 | (103,820) | 45,514
Payment of principal obligations under equipment notes | (24,917) | (32,584) | (4,550)
Payment of principal obligations under finance leases | (336) | (1,238) | (1,201)
Borrowings under equipment notes | 0 | 0 | 35,068
Proceeds from exercise of stock options | 498 | 749 | 341
Debt refinancing costs | 0 | 0 | (1,122)
Payments related to tax withholding for stock-based compensation | (3,352) | (652) | (778)
Other financing activities | 12 | 13,249 | 84
Net cash flows provided by (used in) financing activities | (28,095) | (124,296) | 73,356
Effect of exchange rate changes on cash | (410) | 326 | 132
Net increase in cash and cash equivalents | 59,424 | 10,271 | 4,890
Cash and cash equivalents: |  |  |
Beginning of period | 22,668 | 12,397 | 7,507
End of period | 82,092 | 22,668 | 12,397
Cash paid during the period for: |  |  |
Income taxes payments | 30,009 | 24,185 | 13,381
Interest payments | 1,444 | 4,071 | 5,737
Noncash investing activities: |  |  |
Acquisition of property and equipment for which payment is pending | $ 4,120 | $ 349 | $ 43

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