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Investments (Details) - Schedule of Income Loss Recognized From Equity Method Investment (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Oct. 31, 2014
Oct. 31, 2013
Oct. 31, 2014
Oct. 31, 2013
Investments (Details) - Schedule of Income Loss Recognized From Equity Method Investment [Line Items]        
Income(Loss) From Equity Method Investments $ 8,780 $ 3,331 $ 24,322 $ 9,558
Big River [Member]
       
Investments (Details) - Schedule of Income Loss Recognized From Equity Method Investment [Line Items]        
Income(Loss) From Equity Method Investments 4,574 1,576 14,353 4,312
Patriot [Member]
       
Investments (Details) - Schedule of Income Loss Recognized From Equity Method Investment [Line Items]        
Income(Loss) From Equity Method Investments $ 4,206 $ 1,755 $ 9,969 $ 5,246