Investments (Details) - Schedule of Equity Method Investments (USD $) In Thousands, unless otherwise specified	Oct. 31, 2013	Jan. 31, 2013
Schedule of Equity Method Investments [Line Items]
Total Equity Method Securities, Carrying Amount	$ 69,211	$ 59,959
Big River [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Securities, Ownership percentage	10.00%
Total Equity Method Securities, Carrying Amount	36,549	32,438
Patriot [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Securities, Ownership percentage	27.00%
Total Equity Method Securities, Carrying Amount	$ 32,662	$ 27,521