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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Cash flows from operating activities: |  |  |
Net income | $ 134,837 | $ 97,740 | $ 65,636
Adjustments to reconcile net income to net cash from operating activities: |  |  |
Depreciation and amortization | 292,915 | 300,725 | 298,625
Allowance for doubtful accounts | 10,133 | 2,408 | 15,817
Amortization of deferred financing costs and debt discount | 3,666 | 3,809 | 3,846
Accretion of environmental liabilities | 11,051 | 10,136 | 9,806
Changes in environmental liability estimates | 10,698 | (332) | 2,147
Deferred income taxes | (9,748) | 8,005 | 19,089
Other expense (income), net | 290 | (2,897) | 4,510
Stock-based compensation | 18,502 | 17,816 | 16,792
Loss (gain) on sale of businesses | 3,376 | (687) | 0
Loss on early extinguishment of debt | 0 | 6,131 | 2,488
Environmental expenditures | (12,401) | (18,701) | (10,115)
Changes in assets and liabilities, net of acquisitions: |  |  |
Accounts receivable and unbilled accounts receivable | 22,422 | (33,271) | (79,563)
Inventories and supplies | (7,933) | (15,869) | (26,958)
Other current and non-current assets | (12,602) | (14,421) | (7,946)
Accounts payable | (80,328) | 7,153 | 46,915
Other current and long-term liabilities | 45,719 | 45,447 | 12,121
Net cash from operating activities | 430,597 | 413,192 | 373,210
Cash flows used in investing activities: |  |  |
Additions to property, plant and equipment | (196,256) | (216,324) | (193,344)
Proceeds from sale and disposal of fixed assets | 9,623 | 11,655 | 15,445
Acquisitions, net of cash acquired | (8,839) | (29,363) | (151,023)
Additions to intangible assets including costs to obtain or renew permits | (2,029) | (3,904) | (4,688)
Purchases of available-for-sale securities | (70,891) | (35,836) | (44,772)
Proceeds from sale of available-for-sale securities | 61,220 | 51,202 | 28,723
Proceeds from sale of businesses, net of transactional costs | 7,712 | 4,714 | 0
Net cash used in investing activities | (199,460) | (217,856) | (349,659)
Cash flows used in financing activities: |  |  |
Change in uncashed checks | 5,404 | (3,705) | 132
Tax payments related to withholdings on vested restricted stock | (5,331) | (7,429) | (3,266)
Repurchases of common stock | (74,844) | (21,390) | (45,080)
Deferred financing costs paid | (2,171) | (10,079) | (4,027)
Payments on finance leases | (4,469) | (586) | 0
Premiums paid on early extinguishment of debt | 0 | (2,701) | (1,238)
Principal payments on debt | (7,535) | (852,535) | (405,768)
Proceeds from issuance of debt, net of discount | 0 | 845,000 | 348,250
Borrowings from revolving credit facility | 150,000 | 0 | 50,000
Payments on revolving credit facility | (150,000) | 0 | (50,000)
Net cash used in financing activities | (88,946) | (53,425) | (110,997)
Effect of exchange rate change on cash | 4,919 | 3,573 | (5,446)
Increase (decrease) in cash and cash equivalents | 147,110 | 145,484 | (92,892)
Cash and cash equivalents, beginning of year | 371,991 | 226,507 | 319,399
Cash and cash equivalents, end of year | 519,101 | 371,991 | 226,507
Cash payments for interest and income taxes: |  |  |
Interest paid | 72,535 | 60,852 | 89,171
Income taxes paid, net of refunds | 53,123 | 27,035 | 20,036
Non-cash investing activities: |  |  |
Property, plant and equipment accrued | 3,536 | 30,964 | 15,657
Payable for estimated purchase price adjustment | $ 0 | $ 0 | $ 4,032

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