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Supplementary Balance Sheet Detail (Schedule Of Amounts Recognized In Balance Sheet) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2020
Balance Sheet Related Disclosures [Abstract]    
Raw materials and supplies $ 129,879 $ 101,098
Work in process 131,435 110,331
Finished goods 52,334 54,535
Inventories 313,648 265,964
Prepaid expenses 9,986 9,242
Value added tax and other indirect taxes receivable 13,890 10,666
Other Inventories, Spare Parts, Gross 12,738 11,825
Other current assets 4,332 3,381
Prepaid Expense and Other Assets, Current 40,946 35,114
Land and improvements 46,548 50,285
Buildings 71,784 80,041
Machinery and equipment and other 567,715 621,478
Construction in progress 47,370 33,098
Property, plant and equipment 733,417 784,902
Payrolls (including incentive programs) 11,801 13,159
Employee benefits 7,416 7,128
Deferred Revenue 11,776 13,056
Other 17,342 23,158
Accrued liabilities, net 48,335 56,501
Postretirement benefits 16,528 15,669
Pension and related benefits 37,431 37,847
Other 18,603 27,962
Other long - term obligations 72,562 $ 81,478
Increase (Decrease) in Raw Materials, Packaging Materials and Supplies Inventories 25,100  
Increase Decrease In Work in Process Inventories 5,800  
Increase Decrease In Finished Goods Inventories $ 19,300