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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Cash flows from operating activities: |  |  |
Net income | $ 203,247 | $ 134,837 | $ 97,740
Adjustments to reconcile net income to net cash from operating activities: |  |  |
Depreciation and amortization | 298,135 | 292,915 | 300,725
Allowance for doubtful accounts | 8,018 | 10,133 | 2,408
Amortization of deferred financing costs and debt discount | 4,245 | 3,666 | 3,809
Accretion of environmental liabilities | 11,745 | 11,051 | 10,136
Changes in environmental liability estimates | 2,979 | 10,698 | (332)
Deferred income taxes | 1,482 | (9,748) | 8,005
Other expense (income), net | 515 | 290 | (2,897)
Stock-based compensation | 18,839 | 18,502 | 17,816
Loss (gain) on sale of businesses | 0 | 3,376 | (687)
Loss on early extinguishment of debt | 0 | 0 | 6,131
Environmental expenditures | (15,506) | (12,401) | (18,701)
Changes in assets and liabilities, net of acquisitions: |  |  |
Accounts receivable and unbilled accounts receivable | (96,551) | 22,422 | (33,271)
Inventories and supplies | (31,689) | (7,933) | (15,869)
Other current and non-current assets | 9,268 | (12,602) | (14,421)
Accounts payable | 108,398 | (80,328) | 7,153
Other current and long-term liabilities | 22,872 | 45,719 | 45,447
Net cash from operating activities | 545,997 | 430,597 | 413,192
Cash flows used in investing activities: |  |  |
Additions to property, plant and equipment | (241,856) | (196,256) | (216,324)
Proceeds from sale and disposal of fixed assets | 22,156 | 9,623 | 11,655
Acquisitions, net of cash acquired | (1,253,232) | (8,839) | (29,363)
Additions to intangible assets including costs to obtain or renew permits | (3,848) | (2,029) | (3,904)
Purchases of available-for-sale securities | (129,234) | (70,891) | (35,836)
Proceeds from sale of available-for-sale securities | 98,412 | 61,220 | 51,202
Proceeds from sale of businesses, net of transactional costs | 0 | 7,712 | 4,714
Net cash used in investing activities | (1,507,602) | (199,460) | (217,856)
Cash flows from (used in) financing activities: |  |  |
Change in uncashed checks | (1,806) | 5,404 | (3,705)
Tax payments related to withholdings on vested restricted stock | (10,805) | (5,331) | (7,429)
Repurchases of common stock | (54,410) | (74,844) | (21,390)
Deferred financing costs paid | (13,737) | (2,171) | (10,079)
Payments on finance leases | (8,458) | (4,469) | (586)
Premiums paid on early extinguishment of debt | 0 | 0 | (2,701)
Principal payments on debt | (7,535) | (7,535) | (852,535)
Proceeds from issuance of debt, net of discount | 995,000 | 0 | 845,000
Borrowings from revolving credit facility | 0 | 150,000 | 0
Payments on revolving credit facility | 0 | (150,000) | 0
Net cash from (used in) financing activities | 898,249 | (88,946) | (53,425)
Effect of exchange rate change on cash | (3,170) | 4,919 | 3,573
(Decrease) increase in cash and cash equivalents | (66,526) | 147,110 | 145,484
Cash and cash equivalents, beginning of year | 519,101 | 371,991 | 226,507
Cash and cash equivalents, end of year | 452,575 | 519,101 | 371,991
Cash payments for interest and income taxes: |  |  |
Interest paid | 73,440 | 72,535 | 60,852
Income taxes paid, net of refunds | 65,192 | 53,123 | 27,035
Non-cash investing activities: |  |  |
Property, plant and equipment accrued | $ 19,264 | $ 3,536 | $ 30,964

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