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Significant Accounting Policies (Exchange Rates) (Details)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Canadian Dollar [Member]      
Currency [Line Items]      
Ending rates 1.3427 1.3840  
Average Rates 1.3256 1.2786 1.1046
Average Rates % Change (3.70%) (15.80%)  
Euros [Member]      
Currency [Line Items]      
Ending rates 0.9476 0.9209  
Average Rates 0.9041 0.9014 0.7539
Average Rates % Change (0.30%) (19.60%)  
Polish Zloty [Member]      
Currency [Line Items]      
Ending rates 4.2065 3.9464  
Average Rates 3.9455 3.7706 3.1558
Average Rates % Change (4.60%) (19.50%)