Debt Obligations Maturities of Debt (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
Debt Instrument [Line Items]
Long-term Debt	$ 198,320		$ 198,058
Capital Lease Obligations	2,275
Capital Lease Obligation, Less than 1 Year	1,205	[1]
Capital Lease Obligation, Year 2	929
Capital Lease Obligation, Year 3	141
Capital Lease Obligation, Year 4	0
Capital Lease Obligation, Year 5	0
Capital Lease Obligation, More than 5 Years	0
Debt and Capital Lease Obligations	1,424,555	[2]
Debt and Capital Lease Obligations, Less than 1 Year	526,919	[1],[2]
Debt and Capital Lease Obligations, Year 2	403,605	[2]
Debt and Capital Lease Obligations, Year 3	159,634	[2]
Debt and Capital Lease Obligations, Year 4	91,713	[2]
Debt and Capital Lease Obligations, Year 5	212,760	[2]
Debt and Capital Lease Obligations, More than 5 Years	29,924	[2]
Securitization Debt [Member]
Debt Instrument [Line Items]
Long-term Debt	1,024,478	[3]
Debt Obligation, Less than 1 Year	490,919	[1],[3]
Debt Obligation, Year 2	285,582	[3]
Debt Obligation, Year 3	158,197	[3]
Debt Obligation, Year 4	89,780	[3]
Debt Obligation, Year 5	0	[3]
Debt Obligation, More than 5 Years	0	[3]
Portfolio Term Residual Financing [Member]
Debt Instrument [Line Items]
Long-term Debt	25,000
Debt Obligation, Less than 1 Year	0	[1]
Debt Obligation, Year 2	0
Debt Obligation, Year 3	0
Debt Obligation, Year 4	0
Debt Obligation, Year 5	0
Debt Obligation, More than 5 Years	25,000
Senior Secured Notes [Member]
Debt Instrument [Line Items]
Long-term Debt	198,320
Debt Obligation, Less than 1 Year	0	[1]
Debt Obligation, Year 2	0
Debt Obligation, Year 3	0
Debt Obligation, Year 4	0
Debt Obligation, Year 5	198,320
Debt Obligation, More than 5 Years	0
Real Estate Mortgage Loan [Member]
Debt Instrument [Line Items]
Long-term Debt	12,454
Debt Obligation, Less than 1 Year	223	[1]
Debt Obligation, Year 2	236
Debt Obligation, Year 3	251
Debt Obligation, Year 4	264
Debt Obligation, Year 5	11,480
Debt Obligation, More than 5 Years	0
Equipment Note, Secured by Aircraft [Member]
Debt Instrument [Line Items]
Long-term Debt	1,774
Debt Obligation, Less than 1 Year	1,774	[1]
Debt Obligation, Year 2	0
Debt Obligation, Year 3	0
Debt Obligation, Year 4	0
Debt Obligation, Year 5	0
Debt Obligation, More than 5 Years	0
Portfolio Warehouse Facilities [Member]
Debt Instrument [Line Items]
Long-term Debt	57,200	[4]
Debt Obligation, Less than 1 Year	32,350	[1],[4]
Debt Obligation, Year 2	24,850	[4]
Debt Obligation, Year 3	0	[4]
Debt Obligation, Year 4	0	[4]
Debt Obligation, Year 5	0	[4]
Debt Obligation, More than 5 Years	0	[4]
Inventory Facility [Member]
Debt Instrument [Line Items]
Long-term Debt	91,321
Debt Obligation, Less than 1 Year	0	[1]
Debt Obligation, Year 2	91,321
Debt Obligation, Year 3	0
Debt Obligation, Year 4	0
Debt Obligation, Year 5	0
Debt Obligation, More than 5 Years	0
Real Estate Credit Facility [Member]
Debt Instrument [Line Items]
Long-term Debt	11,733
Debt Obligation, Less than 1 Year	448	[1]
Debt Obligation, Year 2	687
Debt Obligation, Year 3	1,045
Debt Obligation, Year 4	1,669
Debt Obligation, Year 5	2,960
Debt Obligation, More than 5 Years	$ 4,924

[1] Generally and historically, we renewed or replaced facilities expiring in less than one year.

[2] Total contractual obligations exclude future interest payment obligations.

[3] Securitization obligations and bank term financing agreements do not have a contractual termination date. Therefore, all collections on the contracts collateralizing the securities are used to repay the asset-backed security holders based on an expected duration of the securities.

[4] On the termination date of the facilities, amounts outstanding at termination are not due and payable immediately. All collections on the contracts collateralizing these facilities are used to pay down the facilities until they are paid in full because these facilities contain term-out features.