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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Cash flows from operating activities: |  |  |
Net income | $ 97,740 | $ 65,636 | $ 100,739
Adjustments to reconcile net income to net cash from operating activities: |  |  |
Depreciation and amortization | 300,725 | 298,625 | 288,422
Allowance for doubtful accounts | 2,408 | 15,817 | 7,901
Amortization of deferred financing costs and debt discount | 3,809 | 3,846 | 3,482
Accretion of environmental liabilities | 10,136 | 9,806 | 9,460
Changes in environmental liability estimates | (332) | 2,147 | (195)
Deferred income taxes | 8,005 | 19,089 | (83,335)
Other (income) expense, net | (2,897) | 4,510 | 6,119
Stock-based compensation | 17,816 | 16,792 | 13,146
Gain on sale of businesses | (687) | 0 | (30,732)
Loss on early extinguishment of debt | 6,131 | 2,488 | 7,891
Environmental expenditures | (18,701) | (10,115) | (12,965)
Changes in assets and liabilities, net of acquisitions: |  |  |
Accounts receivable and unbilled accounts receivable | (33,271) | (79,563) | (33,764)
Inventories and supplies | (15,869) | (26,958) | (5,002)
Other current assets | (14,421) | (7,946) | 16,720
Accounts payable | 7,153 | 46,915 | (10,684)
Other current and long-term liabilities | 45,447 | 12,121 | 8,495
Net cash from operating activities | 413,192 | 373,210 | 285,698
Cash flows used in investing activities: |  |  |
Additions to property, plant and equipment | (216,324) | (193,344) | (167,007)
Proceeds from sale and disposal of fixed assets | 11,655 | 15,445 | 7,124
Acquisitions, net of cash acquired | (29,363) | (151,023) | (49,227)
Additions to intangible assets including costs to obtain or renew permits | (3,904) | (4,688) | (1,617)
Purchases of available-for-sale securities | (35,836) | (44,772) | (38,342)
Proceeds from sale of available-for-sale securities | 51,202 | 28,723 | 376
Proceeds from sale of businesses, net of transactional costs | 4,714 | 0 | 45,426
Net cash used in investing activities | (217,856) | (349,659) | (203,267)
Cash flows used in financing activities: |  |  |
Change in uncashed checks | (3,705) | 132 | (5,940)
Proceeds from exercise of stock options | 0 | 0 | 46
Tax payments related to withholdings on vested restricted stock | (7,429) | (3,266) | (3,149)
Repurchases of common stock | (21,390) | (45,080) | (48,971)
Deferred financing costs paid | (10,079) | (4,027) | (5,718)
Payments on finance leases | (586) | 0 | 0
Premiums paid on early extinguishment of debt | (2,701) | (1,238) | (6,028)
Principal payments on debt | (852,535) | (405,768) | (402,000)
Proceeds from issuance of debt, net of discount | 845,000 | 348,250 | 399,000
Borrowing from revolving credit facility | 0 | 50,000 | 0
Payment on revolving credit facility | 0 | (50,000) | 0
Net cash used in financing activities | (53,425) | (110,997) | (72,760)
Effect of exchange rate change on cash | 3,573 | (5,446) | 2,731
Increase (decrease) in cash and cash equivalents | 145,484 | (92,892) | 12,402
Cash and cash equivalents, beginning of year | 226,507 | 319,399 | 306,997
Cash and cash equivalents, end of year | 371,991 | 226,507 | 319,399
Cash payments for interest and income taxes: |  |  |
Interest paid | 60,852 | 89,171 | 93,174
Income taxes paid | 27,035 | 20,036 | 18,682
Non-cash investing activities: |  |  |
Property, plant and equipment accrued | 30,964 | 15,657 | 16,109
Transfer of inventory to property, plant and equipment | 0 | 0 | 12,641
Payable for estimated purchase price adjustment | $ 0 | $ 4,032 | $ 0

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