Fair Value Of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Dealer Financie Receivables - GO, Net	$ 40,956		$ 24		$ 0
Portfolio Term Financings	1,049,478		782,634
Portfolio Warehouse Facilities	57,200		141,392
Senior Secured Notes Payable	193,320		198,058
Other Secured Notes Payable	117,281		99,296
Securitization Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Portfolio Term Financings	677,118		679,031
Portfolio Term Residual Financing [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Portfolio Term Financings	25,000		100,000
Bank Term Financings [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Portfolio Term Financings	347,360		3,603
Revolving Inventory Facility [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Secured Notes Payable	91,320		84,500
Mortgage Note Payable [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Secured Notes Payable	12,454		12,661
Equipment Note Payable [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Secured Notes Payable	1,774		2,135
Real Estate Credit Facility [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Secured Notes Payable	11,733
Carrying Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Finance Receivables, net (1)	1,370,800	[1]	1,259,633	[1]
Dealer Financie Receivables - GO, Net	40,956		24
Portfolio Warehouse Facilities	57,200		141,392
Senior Secured Notes Payable	198,320		198,058
Carrying Value [Member] | Securitization Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Portfolio Term Financings	677,118		679,031
Carrying Value [Member] | Portfolio Term Residual Financing [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Portfolio Term Financings	25,000		100,000
Carrying Value [Member] | Bank Term Financings [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Portfolio Term Financings	347,360		3,603
Carrying Value [Member] | Revolving Inventory Facility [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Secured Notes Payable	91,320		84,500
Carrying Value [Member] | Mortgage Note Payable [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Secured Notes Payable	12,454		12,661
Carrying Value [Member] | Equipment Note Payable [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Secured Notes Payable	1,774		2,135
Carrying Value [Member] | Real Estate Credit Facility [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Secured Notes Payable	11,733		0
Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Finance Receivables, net (1)	1,441,026	[1]	1,339,049	[1]
Dealer Financie Receivables - GO, Net	40,956		24
Portfolio Warehouse Facilities	57,200		141,392
Senior Secured Notes Payable	220,135		210,932
Fair Value [Member] | Securitization Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Portfolio Term Financings	702,031		675,231
Fair Value [Member] | Portfolio Term Residual Financing [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Portfolio Term Financings	25,000		100,000
Fair Value [Member] | Bank Term Financings [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Portfolio Term Financings	347,360		3,700
Fair Value [Member] | Revolving Inventory Facility [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Secured Notes Payable	91,600		84,500
Fair Value [Member] | Mortgage Note Payable [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Secured Notes Payable	11,200		11,800
Fair Value [Member] | Equipment Note Payable [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Secured Notes Payable	1,774		2,100
Fair Value [Member] | Real Estate Credit Facility [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Secured Notes Payable	$ 11,700		$ 0

[1] Represents finance receivable principal balances, plus accrued interest, less the allowance for credit losses.