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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 | $ 214,090 | $ 242,227 | $ 194,766
Adjustments to reconcile net income to net cash provided by operations: |  |  |
Depreciation | 180,513 | 166,944 | 156,292
Amortization | 39,787 | 27,608 | 15,455
Stock-based compensation | 34,148 | 23,893 | 19,561
Provision for CECL in 2020 and allowance for doubtful accounts in 2019 and 2018 | 865 | 782 | 923
Loss (gain) on disposition of fixed assets | 2,627 | 344 | (770)
Net gain on remeasurement of equity securities | (64) | 0 | (6,500)
Deferred income taxes | (8,198) | 8,746 | (23,352)
Defined benefit plan expense | 23,372 | 15,342 | 19,501
Equity in results of affiliates | 1,443 | (135) | 229
Change in fair value of contingent consideration | 5,230 | 0 | 0
Changes in balance sheet items, excluding effects from foreign currency adjustments: |  |  |
Accounts and other receivables | 13,455 | 8,811 | (66,968)
Inventories | 13,722 | 605 | (25,183)
Prepaid and other current assets | (3,078) | 6,596 | (9,437)
Accounts payable, accrued and other liabilities | 65,592 | 9,997 | 60,576
Income taxes payable | (6,091) | 5,658 | (3,155)
Retirement and deferred compensation plan liabilities | (7,267) | (3,956) | (22,762)
Other changes, net | 7 | 995 | 4,452
Net Cash Provided by Operations | 570,153 | 514,457 | 313,628
Cash Flows from Investing Activities: |  |  |
Capital expenditures | (245,954) | (242,276) | (211,252)
Proceeds from sale of property, plant and equipment | 5,261 | 4,301 | 4,466
Insurance proceeds | 0 | 0 | 10,631
Purchase of short-term investments | (243) | 0 | 0
Acquisition of business, net of cash acquired | (164,181) | (106,328) | (527,916)
Acquisition of intangible assets, net | (6,092) | (4,806) | (611)
Investment in equity securities | (39,628) | (3,530) | (10,000)
Proceeds from sale of investment in equity securities | 0 | 16,487 | 0
Notes receivable, net | (1,141) | (116) | (779)
Net Cash Used by Investing Activities | (451,978) | (336,268) | (735,461)
Cash Flows from Financing Activities: |  |  |
Proceeds from notes payable and overdrafts | 22,342 | 50,854 | 49,069
Repayments of notes payable and overdrafts | (36,314) | (53,269) | (29,994)
Proceeds and repayments of short term revolving credit facility, net | 27,000 | (52,096) | 81,063
Proceeds from long-term obligations | 4,852 | 10,523 | 13,161
Repayments of long-term obligations | (64,735) | (67,276) | (72,290)
Payment of contingent consideration obligation | (2,765) | 0 | 0
Dividends paid | (92,658) | (90,208) | (82,346)
Proceeds from stock option exercises | 68,555 | 90,834 | 88,156
Purchase of treasury stock | 0 | (86,497) | (3,905)
Common stock repurchased and retired | 0 | 0 | (57,786)
Net Cash Used by Financing Activities | (73,723) | (197,135) | (14,872)
Effect of Exchange Rate Changes on Cash | 13,545 | (904) | (9,112)
Net Increase (Decrease) in Cash and Equivalents and Restricted Cash | 57,997 | (19,850) | (445,817)
Cash and Equivalents and Restricted Cash at Beginning of Period | 246,973 | 266,823 | 712,640
Cash and Equivalents and Restricted Cash at End of Period | 304,970 | 246,973 | 266,823
Supplemental Cash Flow Disclosure: |  |  |
Interest paid | 33,317 | 34,422 | 32,005
Income taxes paid | $ 93,575 | $ 86,097 | $ 96,048

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