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UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020
Cash flows from operating activities: |  |
Net income | $ 154,254 | $ 95,505
Adjustments to reconcile net income to net cash from operating activities: |  |
Depreciation and amortization | 215,206 | 221,497
Allowance for doubtful accounts | 7,186 | 10,441
Amortization of deferred financing costs and debt discount | 2,718 | 2,688
Accretion of environmental liabilities | 8,625 | 8,149
Changes in environmental liability estimates | 341 | 9,050
Deferred income taxes | 5,202 | 0
Other expense, net | 2,509 | 597
Stock-based compensation | 12,786 | 12,739
Loss on sale of businesses | 0 | 3,376
Environmental expenditures | (12,223) | (8,816)
Changes in assets and liabilities, net of acquisitions: |  |
Accounts receivable and unbilled accounts receivable | (113,601) | 23,969
Inventories and supplies | (12,882) | (9,554)
Other current and non-current assets | (10,785) | (19,320)
Accounts payable | 86,974 | (63,898)
Other current and long-term liabilities | 21,916 | 31,009
Net cash from operating activities | 368,226 | 317,432
Cash flows used in investing activities: |  |
Additions to property, plant and equipment | (146,654) | (150,357)
Proceeds from sale and disposal of fixed assets | 16,424 | 7,307
Acquisitions, net of cash acquired | (22,819) | (8,839)
Proceeds from sale of businesses, net of transactional costs | 0 | 7,712
Additions to intangible assets including costs to obtain or renew permits | (2,659) | (1,863)
Proceeds from sale of available-for-sale securities | 83,226 | 39,141
Purchases of available-for-sale securities | (96,785) | (53,397)
Net cash used in investing activities | (169,267) | (160,296)
Cash flows used in financing activities: |  |
Change in uncashed checks | (4,323) | 381
Tax payments related to withholdings on vested restricted stock | (7,383) | (4,407)
Repurchases of common stock | (48,409) | (39,542)
Deferred financing costs paid | (150) | 0
Payments on finance leases | (5,845) | (2,755)
Principal payments on debt | (5,652) | (5,652)
Borrowing from revolving credit facility | 0 | 150,000
Payment on revolving credit facility | 0 | (150,000)
Net cash used in financing activities | (71,762) | (51,975)
Effect of exchange rate change on cash | 365 | (1,446)
Increase in cash and cash equivalents | 127,562 | 103,715
Cash and cash equivalents, beginning of period | 519,101 | 371,991
Cash and cash equivalents, end of period | 646,663 | 475,706
Cash payments for interest and income taxes: |  |
Interest paid | 61,807 | 66,000
Income taxes paid, net of refunds | 48,202 | 14,195
Non-cash investing activities: |  |
Property, plant and equipment accrued | 11,561 | 11,732
ROU assets obtained in exchange for operating lease liabilities | 18,528 | 19,993
ROU assets obtained in exchange for finance lease liabilities | $ 18,704 | $ 28,333

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