Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash Flows from Operating Activities:
Net Income	$ 38,894	$ 62,121
Adjustments to Reconcile Net Income to Net Cash (Used In) / Provided by Operating Activities:
Provision for Credit Losses - Finance Receivables	148,155	111,729
Provision for Credit Losses - Dealer Finance Receivables	888	0
Depreciation Expense	11,304	9,970
Amortization of Debt Issuance Costs and Debt Premium and Discount	3,166	3,864
Non-Cash Compensation Expense—Related Party	621	930
Loss (Gain) from Disposal of Property and Equipment	14	(115)
Originations of Finance Receivables	(591,277)	(520,378)
Collections and Recoveries on Finance Receivable Principal Balances	284,395	282,442
Change in Accrued Interest Receivable and Loan Origination Costs	(1,421)	(2,512)
Decrease in Vehicle Inventory	44,228	75,786
Change in Other Assets	12,266	8,425
Increase in Accounts Payable, Accrued Expenses and Other Liabilities	17,251	10,994
Change in Accrued Expenses-Related Party	(69)	61
Net Cash (Used In) / Provided By Operating Activities	(31,585)	43,317
Cash Flows from Investing Activities:
Originations of Dealer Finance Receivables	(65,071)	(12,249)
Collections and Recoveries of Dealer Finance Receivables, net	12,861	640
Proceeds from Disposal of Property and Equipment	932	780
Purchase of Property and Equipment	(17,031)	(9,923)
Net Cash Used in Investing Activities	(68,309)	(20,752)
Cash Flows from Financing Activities:
Increase in Restricted Cash	(14,475)	(2,220)
Deposits into Investments Held in Trust	(4,500)	(4,500)
Collections, Buybacks and Change in Investments Held in Trust	(20,792)	31
Additions to Portfolio Term Financings	311,990	235,046
Repayment of Portfolio Term Financings	(252,540)	(218,108)
Additions to Portfolio Warehouse Facilities	474,700	437,300
Repayment of Portfolio Warehouse Facilities	(453,900)	(436,500)
Additions to Senior Secured Notes Payable	55,500	0
Additions to Other Secured Notes Payable	20,000	12,968
Repayment of Other Secured Notes Payable	(1,266)	(20,769)
Payment of Debt Issuance Costs	(3,340)	(2,863)
Dividend Distributions	(10,855)	(25,724)
Net Cash Provided by / (Used in) Financing Activities	100,522	(25,339)
Net Increase / (Decrease) in Cash and Cash Equivalents	628	(2,774)
Cash and Cash Equivalents at Beginning of Period	26,480	25,930
Cash and Cash Equivalents at End of Period	27,108	23,156
Supplemental Statement of Cash Flows Information:
Interest Paid	36,858	36,094
Interest Paid—Related Party	316	0
Income Taxes Paid	828	1,053
Supplemental Statement of Non-Cash Investing and Financing Activities:
Disposal of Fully Depreciated Property and Equipment	$ 0	$ 2,710