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Investments (Details) - Schedule of Income Loss Recognized From Equity Method Investment (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2014	Jul. 31, 2013
Investments (Details) - Schedule of Income Loss Recognized From Equity Method Investment [Line Items]
Income Loss From Equity Method Investments	$ 7,245	$ 4,628	$ 15,542	$ 6,227
Big River [Member]
Investments (Details) - Schedule of Income Loss Recognized From Equity Method Investment [Line Items]
Income Loss From Equity Method Investments	4,720	2,092	9,779	2,736
Patriot [Member]
Investments (Details) - Schedule of Income Loss Recognized From Equity Method Investment [Line Items]
Income Loss From Equity Method Investments	$ 2,525	$ 2,536	$ 5,763	$ 3,491

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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