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Shareholders' Equity (Stock Option Summary) (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2012
$3.82 [Member]
Dec. 31, 2012
$18.82 [Member]
Dec. 31, 2012
$15.28 [Member]
Exercise price US$         $ 3.82 $ 18.82 $ 15.28
Options outstanding, Number of options 413,087 257,425 305,825 240,700 40,087 135,000 238,000
Options outstanding, Weighted average remaining contractual life (in years)         3 years 9 months 15 days 5 years 11 months 19 days 7 years 8 months 12 days
Options exercisable, Number of options 107,587       40,087 67,500  
Options exercisable, Weighted average remaining contractual life (in years)         3 years 9 months 15 days 5 years 11 months 19 days