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Other events (Details Textual) (USD $)
In Thousands, except Per Share data, unless otherwise specified
1 Months Ended 3 Months Ended
Dec. 31, 2012
Jan. 31, 2013
Jan. 31, 2012
Other events (Textual) [Abstract]      
Dividend payment $ 0.65    
Payment of dividend to shareholders $ 9,600 $ (9,646) $ (8,124)
Dividend paid date Nov. 28, 2012