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Significant Accounting Policies (Schedule Of Exchange Rates To US Dollar) (Details)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Canadian Dollar (CAD) [Member]      
Currency [Line Items]      
Ending Rates 1.2732 1.2988  
Average Rates 1.3412 1.3268 1.2960
Average Rates % Change (1.10%) (2.40%)  
Euros (EUR) [Member]      
Currency [Line Items]      
Ending Rates 0.8157 0.8906  
Average Rates 0.8776 0.8934 0.8473
Average Rates % Change 1.80% (5.40%)  
Polish Zloty (PLN) [Member]      
Currency [Line Items]      
Ending Rates 3.7136 3.7873  
Average Rates 3.8989 3.8378 3.6103
Average Rates % Change (1.60%) (6.30%)  
British Pound (GBP) [Member]      
Currency [Line Items]      
Ending Rates 0.7325 0.7563  
Average Rates 0.7798 0.7836 0.7497
Average Rates % Change 0.50% (4.50%)