Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash Flows from Operating Activities:
Net Income	$ 18,589	$ 32,795
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Provision for Credit Losses	77,842	60,342
Depreciation Expense	5,408	4,951
Amortization of Debt Issuance Costs and Debt Premium and Discount	1,660	1,913
Non-Cash Compensation Expense—Related Party	311	465
Loss (Gain) from Disposal of Property and Equipment	31	(60)
Originations of Finance Receivables	(312,074)	(292,970)
Collections and Recoveries on Finance Receivable Principal Balances	145,923	148,309
Change in Accrued Interest Receivable and Loan Origination Costs	423	(506)
Change in Inventory	41,857	80,748
Change in Other Assets	8,829	6,042
Increase in Accounts Payable, Accrued Expenses and Other Liabilities	24,530	20,476
Change in Accrued Expenses-Related Party	123	95
Net Cash Provided By Operating Activities	13,452	62,600
Cash Flows from Investing Activities:
Origination of Dealer Finance Receivables	(38,960)	(5,627)
Collections and Recoveries of Dealer Finance Receivables	5,163	178
Proceeds from Disposal of Property and Equipment	641	456
Purchase of Property and Equipment	(7,797)	(5,650)
Net Cash Used in Investing Activities	(40,953)	(10,643)
Cash Flows from Financing Activities:
Increase in Restricted Cash	(15,624)	(8,499)
Collections, Buybacks and Change in Investments Held in Trust	(4,255)	(1,785)
Additions to Portfolio Term Financings	75,000	0
Repayment of Portfolio Term Financings	(135,207)	(112,289)
Additions to Portfolio Warehouse Facilities	210,300	195,800
Repayment of Portfolio Warehouse Facilities	(122,500)	(108,000)
Additions to Other Secured Notes Payable	20,000	0
Repayment of Other Secured Notes Payable	(614)	(14,531)
Payment of Debt Issuance Costs	(348)	(557)
Dividend Distributions	0	(5,260)
Net Cash Provided by / (Used in) Financing Activities	26,752	(55,121)
Net Decrease in Cash and Cash Equivalents	(749)	(3,164)
Cash and Cash Equivalents at Beginning of Period	26,480	25,930
Cash and Cash Equivalents at End of Period	25,731	22,766
Supplemental Statement of Cash Flows Information:
Interest Paid	11,424	11,311
Interest Paid—Related Party	158	0
Income Taxes Paid	518	463
Supplemental Statement of Non-Cash Investing and Financing Activities:
Disposal of Fully Depreciated Property and Equipment	$ 0	$ 551