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Financial Instruments (Schedule of Significant Exchange Rates) (Details)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
USD [Member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Spot price of 1 Euro at the reporting date 1.00  
1 Euro [Member] | USD [Member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
% of change 13.90% (3.40%)
Spot price of 1 Euro at the reporting date 1.198 1.052
1 Euro [Member] | NIS [Member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
% of change 2.70% (4.80%)
Spot price of 1 Euro at the reporting date 4.153 4.044