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Debt Obligations (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Pooled Auto Loan Program Financings [Member]
   
Debt Instrument [Line Items]    
Collateral $ 362,200 $ 443,900
Cash Reserve $ 6,900 $ 6,900
Pooled Auto Loan Program Financings [Member] | LIBOR [Member]
   
Debt Instrument [Line Items]    
Basis spread on variable interest rate 2.00% 2.00%
Interest Rate 2.20% 2.20%
Portfolio Term Residual Financing [Member] | LIBOR [Member]
   
Debt Instrument [Line Items]    
Basis spread on variable interest rate 3.50% 3.50%
Interest Rate 3.70% 3.70%
Option One [Member] | Term Residual Warehouse Facility [Member] | LIBOR [Member]
   
Debt Instrument [Line Items]    
Basis spread on variable interest rate 3.50%  
Option Two [Member] | Term Residual Warehouse Facility [Member] | LIBOR [Member]
   
Debt Instrument [Line Items]    
Basis spread on variable interest rate 6.00%