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Debt Obligations (Details 1) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Mar. 31, 2012
Jun. 30, 2011
Acquired Securitized Financings      
Securitized financings - contractual amount $ 114,056 $ 117,507  
Purchase Discount      
Accretable (24,634) (26,032) (31,346)
Non-accretable       
Total securitized financings, net $ 89,422 $ 91,475