Investments (Details) - Schedule of Equity Method Investments - USD ($) $ in Thousands	Jul. 31, 2015	Jan. 31, 2015
Schedule of Equity Method Investments [Line Items]
Total Equity Method Investments, Carrying Amount	$ 41,778	$ 80,389
Big River [Member]
Schedule of Equity Method Investments [Line Items]
Total Equity Method Investments, Ownership Percentage	10.00%
Total Equity Method Investments, Carrying Amount	$ 41,778	40,188
Patriot [Member]
Schedule of Equity Method Investments [Line Items]
Total Equity Method Investments, Ownership Percentage	27.00%
Total Equity Method Investments, Carrying Amount		$ 40,201