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Fair Values of Assets and Liabilities Quantitative Information about Level 3 Liabilities Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2013
Minimum [Member]
Jun. 30, 2013
Maximum [Member]
Jun. 30, 2013
Weighted Average [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]          
Notes payable associated with structured financings, at fair value $ 113,613 $ 140,127      
Gross yield     8.40% 25.30% 18.80%
Principal payment rate     1.50% 3.20% 2.50%
Expected credit loss rate     11.70% 23.00% 18.70%
Discount rate     15.90% 20.30% 17.60%