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Rialto Investments Segment (Outstanding Balance And Carrying Value Of Loans) (Details) (Rialto Investments [Member], USD $)
In Thousands, unless otherwise specified
May 31, 2012
Nov. 30, 2011
Rialto Investments [Member]
   
Segment Reporting Information [Line Items]    
Outstanding principal balance $ 1,040,569 $ 1,331,094
Carrying value $ 517,967 $ 639,642