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Significant Accounting Policies (Average Exchange Rates) (Details)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Canadian Dollar (CAD) [Member]      
Currency [Line Items]      
Average Rates 1.3268 1.2960 1.2981
Average Rates % Change (2.40%) 0.20%  
Euros (EUR) [Member]      
Currency [Line Items]      
Average Rates 0.8934 0.8473 0.8871
Average Rates % Change (5.40%) 4.50%  
Polish Zloty (PLN) [Member]      
Currency [Line Items]      
Average Rates 3.8378 3.6103 3.7764
Average Rates % Change (6.30%) 4.40%  
British Pound (GBP) [Member]      
Currency [Line Items]      
Average Rates 0.7836 0.7497 0.7767
Average Rates % Change (4.50%) 3.50%