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UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2022 | Jun. 30, 2021
Cash flows from operating activities: |  |
Net income | $ 193,471 | $ 88,811
Adjustments to reconcile net income to net cash from operating activities: |  |
Depreciation and amortization | 172,166 | 143,755
Allowance for doubtful accounts | 6,927 | 2,109
Amortization of deferred financing costs and debt discount | 3,135 | 1,806
Accretion of environmental liabilities | 6,353 | 5,826
Changes in environmental liability estimates | 1,232 | 445
Deferred income taxes | 2,226 | 1,912
Other (income) expense, net | (1,969) | 2,708
Stock-based compensation | 12,547 | 6,785
Gain on sale of business | (8,864) | 0
Environmental expenditures | (7,028) | (6,594)
Changes in assets and liabilities, net of acquisitions: |  |
Accounts receivable and unbilled accounts receivable | (263,584) | (51,285)
Inventories and supplies | (23,888) | 765
Other current and non-current assets | (25,504) | (12,043)
Accounts payable | 45,748 | 49,880
Other current and long-term liabilities | 19,002 | 30,552
Net cash from operating activities | 131,970 | 265,432
Cash flows used in investing activities: |  |
Additions to property, plant and equipment | (148,042) | (91,988)
Proceeds from sale and disposal of fixed assets | 3,023 | 3,479
Acquisitions, net of cash acquired | (68,766) | (22,918)
Proceeds from sale of business, net of transaction costs | 17,486 | 0
Additions to intangible assets including costs to obtain or renew permits | (836) | (1,750)
Proceeds from sale of available-for-sale securities | 32,835 | 70,526
Purchases of available-for-sale securities | (23,182) | (89,689)
Net cash used in investing activities | (187,482) | (132,340)
Cash flows used in financing activities: |  |
Change in uncashed checks | 475 | (2,895)
Tax payments related to withholdings on vested restricted stock | (2,571) | (4,739)
Repurchases of common stock | (33,694) | (45,409)
Deferred financing costs paid | (321) | (146)
Payments on finance leases | (6,552) | (3,577)
Principal payments on debt | (8,768) | (3,768)
Net cash used in financing activities | (51,431) | (60,534)
Effect of exchange rate change on cash | (1,001) | 3,915
(Decrease) increase in cash and cash equivalents | (107,944) | 76,473
Cash and cash equivalents, beginning of period | 452,575 | 519,101
Cash and cash equivalents, end of period | 344,631 | 595,574
Cash payments for interest and income taxes: |  |
Interest paid | 48,104 | 34,164
Income taxes paid, net of refunds | 29,307 | 32,519
Non-cash investing activities: |  |
Property, plant and equipment accrued | 21,156 | 8,807
Remedial liability assumed in acquisition of property, plant and equipment | 13,073 | 0
ROU assets obtained in exchange for operating lease liabilities | 20,686 | 5,774
ROU assets obtained in exchange for finance lease liabilities | $ 7,646 | $ 18,704

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