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Investments (Tables)
 9 Months Ended
Oct. 31, 2015
Investments And Deposits [Abstract]  
Equity Method Investments [Table Text Block] The following table summarizes equity method investments at October 31, 2015 and January 31, 2015 (amounts in thousands):

Entity   Ownership Percentage     Carrying Amount
October 31, 2015		     Carrying Amount
January 31, 2015		  
                         
Big River     9.7 %   $ 41,088     $ 40,188  
Patriot (sold June 1, 2015)     N/A       —       40,201  
Total Equity Method Investments           $ 41,088     $ 80,389  
Schedule Of Income Loss Recognized From Equity Method Investments [Table Text Block] The following table summarizes income recognized from equity method investments for the periods presented (amounts in thousands):

    Three Months Ended
October 31,		     Nine Months Ended
October 31,		  
    2015     2014     2015     2014  
                                 
Big River   $ 1,314     $ 4,574     $ 4,910     $ 14,353  
Patriot (sold June 1, 2015)     —       4,206       2,947       9,969  
Total   $ 1,314     $ 8,780     $ 7,857     $ 24,322  
Schedule of Financial Information for Equity Method Investments [Table Text Block] Summarized financial information for each of the Company’s equity method investees is presented in the following table for the periods presented (amounts in thousands):

    Three Months Ended
October 31, 2015		     Three Months Ended
October 31, 2014		  
    Patriot (1)     Big River     Patriot (1)     Big River  
                                 
Net sales and revenue   $ —     $ 215,902     $ 93,056     $ 260,908  
Gross profit   $ —     $ 22,078     $ 17,597     $ 59,426  
Income from continuing operations   $ —     $ 13,540     $ 15,843     $ 47,114  
Net income   $ —     $ 13,540     $ 15,843     $ 47,114  
    Nine Months Ended
October 31, 2015		     Nine Months Ended
October 31, 2014		  
    Patriot (1)     Big River     Patriot (1)     Big River  
                                 
Net sales and revenue   $ 115,614     $ 623,900     $ 252,592     $ 854,174  
Gross profit   $ 14,424     $ 71,345     $ 42,626     $ 183,736  
Income from continuing operations   $ 11,100     $ 50,580     $ 37,549     $ 147,853  
Net income   $ 11,100     $ 50,580     $ 37,549     $ 147,853  
(1) For Patriot, results are for the five month period ended May 31, 2015 as the Company’s equity interest in Patriot was sold June 1, 2015.