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Description Of Business And Basis Of Presentation (Average Exchange Rates) (Details)
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Canadian Dollar (CAD) [Member]      
Currency [Line Items]      
Ending rates 1.2894   1.2545
Average Rates 1.2643 1.3234  
Average Rates % Change 4.50%    
Euros (EUR) [Member]      
Currency [Line Items]      
Ending rates 0.8126   0.8334
Average Rates 0.8136 0.9384  
Average Rates % Change 13.30%    
Polish Zloty (PLN) [Member]      
Currency [Line Items]      
Ending rates 3.4210   3.4841
Average Rates 3.3992 4.0563  
Average Rates % Change 16.20%    
British Pound (GBP) [Member]      
Currency [Line Items]      
Ending rates 0.7121   0.7396
Average Rates 0.7186 0.8071  
Average Rates % Change 11.00%