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UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Cash flows from operating activities: |  |
Net income | $ 69,832 | $ 72,401
Adjustments to reconcile net income to net cash from operating activities: |  |
Depreciation and amortization | 95,065 | 84,758
Allowance for doubtful accounts | 1,728 | 1,398
Amortization of deferred financing costs and debt discount | 1,329 | 1,354
Accretion of environmental liabilities | 3,217 | 3,407
Changes in environmental liability estimates | 917 | 683
Deferred income taxes | (88) | (363)
Other expense (income), net | 1,141 | (116)
Stock-based compensation | 6,338 | 6,018
Loss on early extinguishment of debt | 0 | 2,362
Environmental expenditures | (4,729) | (8,348)
Changes in assets and liabilities, net of acquisitions: |  |
Accounts receivable and unbilled accounts receivable | (44,383) | (5,030)
Inventories and supplies | (13,572) | 2,758
Other current and non-current assets | (25,918) | (17,328)
Accounts payable | (17,358) | (21,801)
Other current and long-term liabilities | (54,970) | (94,145)
Net cash from operating activities | 18,549 | 28,008
Cash flows used in investing activities: |  |
Additions to property, plant and equipment | (137,913) | (81,686)
Proceeds from sale and disposal of fixed assets | 1,008 | 1,855
Acquisitions, net of cash acquired | (475,306) | (108,533)
Proceeds from sale of business, net of transaction costs | 750 | 0
Additions to intangible assets including costs to obtain or renew permits | (534) | (333)
Purchases of available-for-sale securities | (31,228) | (39,037)
Proceeds from sale of available-for-sale securities | 33,350 | 29,800
Net cash used in investing activities | (609,873) | (197,934)
Cash flows from (used in) financing activities: |  |
Change in uncashed checks | 7,778 | 164
Tax payments related to withholdings on vested restricted stock | (3,052) | (3,351)
Repurchases of common stock | (5,000) | (3,000)
Deferred financing costs paid | (4,641) | (6,094)
Payments on finance leases | (4,665) | (3,689)
Principal payments on debt | (3,776) | (616,475)
Proceeds from issuance of debt, net of discount | 499,375 | 500,000
Borrowing from revolving credit facility | 0 | 114,000
Net cash from (used in) financing activities | 486,019 | (18,445)
Effect of exchange rate change on cash | (1,568) | 75
Decrease in cash and cash equivalents | (106,873) | (188,296)
Cash and cash equivalents, beginning of period | 444,698 | 492,603
Cash and cash equivalents, end of period | 337,825 | 304,307
Cash payments for interest and income taxes: |  |
Interest paid | 51,243 | 34,878
Income taxes paid, net of refunds | 8,020 | 37,141
Non-cash investing activities: |  |
Property, plant and equipment accrued | 28,266 | 27,533
ROU assets obtained in exchange for operating lease liabilities | 23,101 | 10,203
ROU assets obtained in exchange for finance lease liabilities | $ 14,519 | $ 5,153

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