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Investments (Details) - Schedule of Income Loss Recognized From Equity Method Investments (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jul. 31, 2013
Jul. 31, 2012
Jul. 31, 2013
Jul. 31, 2012
Investments (Details) - Schedule of Income Loss Recognized From Equity Method Investments [Line Items]        
Income Loss From Equity Method Investments $ 4,628 $ (481) $ 6,227 $ (39)
Big River [Member]
       
Investments (Details) - Schedule of Income Loss Recognized From Equity Method Investments [Line Items]        
Income Loss From Equity Method Investments 2,092 104 2,736 661
Patriot [Member]
       
Investments (Details) - Schedule of Income Loss Recognized From Equity Method Investments [Line Items]        
Income Loss From Equity Method Investments $ 2,536 $ (585) $ 3,491 $ (700)