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UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022
Cash flows from operating activities: |  |
Net income | $ 66,948 | $ 58,808
Adjustments to reconcile net income to net cash flows provided by operating activities: |  |
Depreciation and amortization of property and equipment | 39,848 | 36,317
Amortization of intangible assets | 3,686 | 6,847
Stock-based compensation expense | 6,562 | 5,866
Deferred income taxes | 0 | (1)
Gain on sale of property and equipment | (3,293) | (1,747)
Other non-cash items | 564 | 3,230
Changes in operating assets and liabilities, net of acquisition: |  |
Accounts receivable, net | (76,349) | (56,125)
Contract assets, net | (109,803) | (74,775)
Receivable for insurance claims in excess of deductibles | 1,558 | (271)
Other assets | 21,503 | 23,326
Accounts payable | 62,276 | 71,758
Contract liabilities | 3,941 | 5,582
Accrued self-insurance | (1,119) | 1,462
Other liabilities | 12,070 | (6,551)
Net cash flows provided by operating activities | 28,392 | 73,726
Cash flows from investing activities: |  |
Proceeds from sale of property and equipment | 3,998 | 1,649
Cash paid for acquired business, net of cash acquired | 0 | (110,660)
Purchases of property and equipment | (63,791) | (48,522)
Net cash flows used in investing activities | (59,793) | (157,533)
Cash flows from financing activities: |  |
Borrowings under revolving lines of credit | 354,467 | 173,250
Repayments under revolving lines of credit | (328,085) | (115,502)
Borrowings under equipment notes | 0 | 24,187
Payment of principal obligations under equipment notes | (4,597) | (522)
Payment of principal obligations under finance leases | (872) | (1,272)
Proceeds from exercise of stock options | 20 | 30
Repurchase of common stock | 0 | (31,654)
Debt refinancing costs | (2,129) | 0
Payments related to tax withholding for stock-based compensation | (7,936) | (6,791)
Net cash flows provided by financing activities | 10,868 | 41,726
Effect of exchange rate changes on cash | (36) | (4,244)
Net decrease in cash and cash equivalents | (20,569) | (46,325)
Cash and cash equivalents: |  |
Beginning of period | 51,040 | 82,092
End of period | 30,471 | 35,767
Noncash financing activities: |  |
Share repurchases not settled | $ 0 | $ 1,712

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