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Shareholders' Equity (Stock Option Summary) (Details) - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options outstanding, number of options 214,701 192,130 272,750 413,087
Options exercisable, number of options 129,044      
$15.28 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise price US$ $ 15.28      
Options outstanding, number of options 129,044      
Options outstanding, weighted average remaining contractual life (in years) 4 years 8 months 12 days      
Options exercisable, number of options 129,044      
Options exercisable, weighted average remaining contractual life (in years) 4 years 8 months 12 days      
$26.91 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise price US$ $ 26.91      
Options outstanding, number of options 85,657      
Options outstanding, weighted average remaining contractual life (in years) 7 years 7 months 6 days      
Options exercisable, number of options