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Debt Obligations (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Pooled Auto Loan Program Financings [Member]
Debt Instrument [Line Items]
Collateral	$ 401,600	$ 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%
Interest Rate	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%

Carrying amount as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered.

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