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Equity (Share-based Payments to Employees, Non-marketable Options, Exercise Price) (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Granted 2014 US Dollar [Member]      
Disclosure of terms and conditions of share-based payment arrangement [Line Items]      
Exercise price for options outstanding $ 6.77 $ 7.43 $ 6.81
Granted 2015 US Dollar [Member]      
Disclosure of terms and conditions of share-based payment arrangement [Line Items]      
Exercise price for options outstanding 6.92 7.59 6.95
Granted 2016 US Dollar [Member]      
Disclosure of terms and conditions of share-based payment arrangement [Line Items]      
Exercise price for options outstanding 4.21 4.68 $ 4.35
Granted 2017 US Dollar [Member]      
Disclosure of terms and conditions of share-based payment arrangement [Line Items]      
Exercise price for options outstanding 3.89 $ 4.35  
Granted 2018 US Dollar [Member]      
Disclosure of terms and conditions of share-based payment arrangement [Line Items]      
Exercise price for options outstanding $ 3.89