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Shareholders' Equity (Stock Option Summary) (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2013
$18.82 [Member]
Dec. 31, 2013
$15.28 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Exercise price US$         $ 18.82 $ 15.28
Options outstanding, number of options 272,750 413,087 257,425 305,825 42,500 230,250
Options outstanding, weighted average remaining contractual life (in years)         4 years 11 months 19 days 6 years 8 months 12 days
Options exercisable, number of options 42,500       42,500   
Options exercisable, weighted average remaining contractual life (in years)         4 years 11 months 19 days