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Investments (Details) - Schedule of Equity Method Investments (USD $)
In Thousands, unless otherwise specified
Jul. 31, 2014
Jan. 31, 2014
Schedule of Equity Method Investments [Line Items]    
Total Equity Method Investments, Carrying Amount $ 78,069 $ 71,189
Big River [Member]
    
Schedule of Equity Method Investments [Line Items]    
Total Equity Method Investments, Ownership Percentage 10.00%  
Total Equity Method Investments, Carrying Amount 42,804 40,042
Patriot [Member]
    
Schedule of Equity Method Investments [Line Items]    
Total Equity Method Investments, Ownership Percentage 27.00%  
Total Equity Method Investments, Carrying Amount $ 35,265 $ 31,147