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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