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Equity (Share-based Payments to Employees, Non-marketable Options, Range of Exercise Prices) (Details)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of terms and conditions of share-based payment arrangement [Line Items]      
Range of exercise price in Israeli Shekel 15.01-26.30 16.59-40.78 26.92-40.74
Range of exercise price in US Dollar 4.33-7.59 4.31-10.61 6.90-10.44