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Consolidated Statements of Cash Flows - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Cash Flows From Operating Activities |  |  |
Net income | $ 127,656,000 | $ 103,101,000 | $ 111,105,000
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 81,860,000 | 78,701,000 | 81,115,000
Deferred compensation | 9,988,000 | 15,140,000 | (2,329,000)
Realized and unrealized gain on long-term investments | (3,143,000) | (3,955,000) | 2,966,000
Stock-based compensation | 10,080,000 | 8,872,000 | 6,837,000
Deferred income taxes | (4,506,000) | (5,016,000) | 10,355,000
Other non-cash items | 3,068,000 | 2,240,000 | 4,622,000
Changes in assets and liabilities, excluding effects of acquisitions: |  |  |
Receivables, net | (23,417,000) | 4,894,000 | 5,196,000
Inventories | (15,358,000) | 28,460,000 | (24,678,000)
Other current assets | (13,927,000) | (680,000) | 832,000
Accounts payable and accrued liabilities | 55,739,000 | (15,084,000) | (19,023,000)
Pension liabilities | (612,000) | (790,000) | (5,065,000)
Environmental and legal liabilities | (3,021,000) | 2,519,000 | (478,000)
Deferred revenues | 10,809,000 | 26,000 | (324,000)
Net Cash Provided By Operating Activities | 235,216,000 | 218,428,000 | 171,131,000
Cash Flows From Investing Activities |  |  |
Expenditures for property, plant and equipment | (125,792,000) | (105,572,000) | (86,647,000)
Asset acquisition (Note 20) | (2,040,000) |  |
Business acquisitions, net of cash acquired (Note 20) | (13,519,000) | (9,000,000) | (22,852,000)
Other, net | 2,317,000 | 1,905,000 | 1,684,000
Net Cash Used In Investing Activities | (139,034,000) | (112,667,000) | (107,815,000)
Cash Flows From Financing Activities |  |  |
Revolving debt and bank overdrafts, net |  | (7,495,000) | 6,045,000
Other debt repayments | (23,571,000) | (46,429,000) | (20,714,000)
Dividends paid | (25,405,000) | (23,097,000) | (20,857,000)
Company stock repurchased | (15,253,000) | (13,184,000) | (15,500,000)
Stock option exercises | 2,926,000 | 3,037,000 | 4,163,000
Other, net | (3,631,000) | (3,326,000) | (4,785,000)
Net Cash Used In Financing Activities | (64,934,000) | (90,494,000) | (51,648,000)
Effect of Exchange Rate Changes on Cash | 3,307,000 | (78,000) | (10,368,000)
Net Increase in Cash and Cash Equivalents | 34,555,000 | 15,189,000 | 1,300,000
Cash and Cash Equivalents at Beginning of Year | 315,383,000 | 300,194,000 | 298,894,000
Cash and Cash Equivalents at End of Year | 349,938,000 | 315,383,000 | 300,194,000
Supplemental Cash Flow Information |  |  |
Cash payments of income taxes, net of refunds | 39,017,000 | 29,331,000 | 32,973,000
Cash payments of interest | $ 9,329,000 | $ 12,250,000 | $ 12,829,000

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