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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Cash flows from operating activities: |  |  |
Net income | $ 90,990 | $ 83,381 | $ 85,006
Adjustments to reconcile net income to net cash flows provided by operating activities: |  |  |
Depreciation and amortization of property and equipment | 54,231 | 49,161 | 43,894
Amortization of intangible assets | 4,907 | 9,009 | 2,311
Stock-based compensation expense | 8,376 | 7,922 | 7,496
Deferred income taxes | 2,056 | 9,573 | 6,281
Gain on sale of property and equipment | (4,214) | (2,378) | (3,098)
Other non-cash items | 96 | 2,294 | 1,892
Changes in operating assets and liabilities: |  |  |
Accounts receivable, net | (48,527) | (86,939) | 10,659
Contract assets, net | (119,246) | (64,421) | (39,266)
Receivable for insurance claims in excess of deductibles | 1,529 | (14) | (4,619)
Prepaid expenses and other assets | 560 | 1,640 | (25,320)
Accounts payable | 37,250 | 109,008 | 34,348
Contract liabilities | 13,151 | 58,001 | 9,573
Accrued self-insurance | 17 | 4,999 | 5,233
Other liabilities | 29,840 | (13,752) | 2,838
Net cash flows provided by operating activities | 71,016 | 167,484 | 137,228
Cash flows from investing activities: |  |  |
Proceeds from sale of property and equipment | 5,608 | 1,990 | 3,062
Cash paid for acquisitions, net of cash acquired | 0 | (110,660) | 0
Purchases of property and equipment | (84,736) | (77,056) | (52,361)
Net cash flows used in investing activities | (79,128) | (185,726) | (49,299)
Cash flows from financing activities: |  |  |
Borrowings under revolving lines of credit | 562,901 | 198,697 | 0
Repayments under revolving lines of credit | (562,615) | (185,782) | 0
Payment of principal obligations under equipment notes | (4,598) | (1,047) | (24,917)
Payment of principal obligations under finance leases | (1,143) | (1,592) | (336)
Borrowings under equipment notes | 0 | 24,184 | 0
Proceeds from exercise of stock options | 20 | 40 | 498
Debt refinancing costs | (2,129) | 0 | 0
Repurchase of common stock | (2,868) | (36,981) | 0
Payments related to tax withholding for stock-based compensation | (7,936) | (6,791) | (3,352)
Other financing activities | 0 | 0 | 12
Net cash flows used in financing activities | (18,368) | (9,272) | (28,095)
Effect of exchange rate changes on cash | 339 | (3,538) | (410)
Net increase (decrease) in cash and cash equivalents | (26,141) | (31,052) | 59,424
Cash and cash equivalents: |  |  |
Beginning of period | 51,040 | 82,092 | 22,668
End of period | 24,899 | 51,040 | 82,092
Cash paid during the period for: |  |  |
Income taxes payments | 23,949 | 20,462 | 30,009
Interest payments | 4,145 | 2,736 | 1,444
Noncash investing activities: |  |  |
Acquisition of property and equipment for which payment is pending | $ 8,474 | $ 2,218 | $ 4,120

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