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Shareholders' Equity (Schedule Of Restricted Share Units Activity) (Details) - Restricted Share Units [Member] - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Number of Restricted Share Units    
Restricted Share Units, beginning balance 74,000
Restricted Share Units, granted 8,000 74,000
Restricted Share Units, vested (4,000)  
Restricted Share Units, ending balance 78,000 74,000
Weighted average grant date fair value    
Weighted average grant date fair value, granted $ 29.09 $ 46.07
Weighted average grant date fair value, vested $ 46.07