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UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023
Cash flows from operating activities: |  |
Net income | $ 14,311 | $ 66,948
Adjustments to reconcile net income to net cash flows provided by operating activities: |  |
Depreciation and amortization of property and equipment | 45,131 | 39,848
Amortization of intangible assets | 3,666 | 3,686
Stock-based compensation expense | 6,198 | 6,562
Deferred income taxes | (144) | 0
Gain on sale of property and equipment | (4,745) | (3,293)
Other non-cash items | 1,044 | 564
Changes in operating assets and liabilities: |  |
Accounts receivable, net | (50,193) | (76,349)
Contract assets, net | 8,212 | (109,803)
Receivable for insurance claims in excess of deductibles | (1,975) | 1,558
Other assets | 21,687 | 21,503
Accounts payable | (20,607) | 62,276
Contract liabilities | 22,294 | 3,941
Accrued self-insurance | (402) | (1,119)
Other liabilities | 21,519 | 12,070
Net cash flows provided by operating activities | 65,996 | 28,392
Cash flows from investing activities: |  |
Proceeds from sale of property and equipment | 6,815 | 3,998
Purchases of property and equipment | (63,634) | (63,791)
Net cash flows used in investing activities | (56,819) | (59,793)
Cash flows from financing activities: |  |
Borrowings under revolving lines of credit | 584,070 | 354,467
Repayments under revolving lines of credit | (520,076) | (328,085)
Payment of principal obligations under equipment notes | (7,049) | (4,597)
Payment of principal obligations under finance leases | (2,083) | (872)
Proceeds from exercise of stock options | 0 | 20
Repurchase of common stock | (75,000) | 0
Debt refinancing costs | (34) | (2,129)
Payments related to tax withholding for stock-based compensation | (5,866) | (7,936)
Net cash flows provided by (used in) financing activities | (26,038) | 10,868
Effect of exchange rate changes on cash | (469) | (36)
Net decrease in cash and cash equivalents | (17,330) | (20,569)
Cash and cash equivalents: |  |
Beginning of period | 24,899 | 51,040
End of period | $ 7,569 | $ 30,471

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