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Dividends (Details Textual) (USD $)
In Thousands, except Per Share data, unless otherwise specified
1 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Oct. 31, 2012
Oct. 31, 2011
Oct. 31, 2010
Dividends (Textual) [Abstract]          
Dividend payment     $ 0.65 $ 0.55  
Payment of dividend to shareholders $ 9,600 $ 8,100 $ (8,123) $ (8,100) $ (7,252)
Dividend paid date Nov. 28, 2012 Dec. 02, 2011