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Share Capital (Details 4) (Stock Appreciation Rights [Member], USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2012
Exercise Price 3.72 - 8.94
Dec. 31, 2012
Exercise Price 3.72 - 8.94
Maximum [Member]
Dec. 31, 2012
Exercise Price 3.72 - 8.94
Minimum [Member]
Dec. 31, 2012
Exercise Price 8.75 - 8.95
Dec. 31, 2012
Exercise Price 8.75 - 8.95
Maximum [Member]
Dec. 31, 2012
Exercise Price 8.75 - 8.95
Minimum [Member]
Number Outstanding, Balance         3,078,764     10,000    
Number Outstanding, Weighted Average Contractual Life         1 year 2 months 1 day     3 years 3 months 29 days    
Number Outstanding, Weighted Average Price per Share (in dollars per share)         $ 3.72     $ 8.95    
Number Exercisable, Balance 3,088,764 2,067,123 1,777,034   3,078,764     10,000    
Number Exercisable, Weighted Average Price per Share (in dollars per share) $ 3.74 $ 3.75 $ 3.77 $ 8.18 $ 3.72     $ 8.95    
Number Exercisable, Weighted Average Contractual Life         1 year 2 months 1 day     3 years 3 months 29 days    
Range of Exercise Prices (in dollars per share)           $ 8.94 $ 3.72   $ 8.95 $ 8.75