Debt Obligations Portfolio Warehouse Facilities (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013		Dec. 31, 2012
Line of Credit Facility [Line Items]
Amount Drawn	$ 145,000		$ 57,200
Facility Amount	425,000		425,000
Deutsche Bank Warehouse Facility [Member]
Line of Credit Facility [Line Items]
Amount Drawn	48,100		19,300
Facility Amount	150,000		150,000
Stated Advance Rate	65.00%		65.00%
Collateral	111,641	[1]	38,881	[1]
Interest Rate	2.45%	[2]	2.46%	[2]
Wells Fargo Warehouse Facility [Member]
Line of Credit Facility [Line Items]
Amount Drawn	53,000		23,000
Facility Amount	150,000		150,000
Stated Advance Rate	57.60%		58.00%
Collateral	119,858	[1]	42,778	[1]
Interest Rate	2.45%	[2]	2.46%	[2]
RBS Warehouse Facility [Member]
Line of Credit Facility [Line Items]
Amount Drawn	43,900		14,900
Facility Amount	125,000		125,000
Stated Advance Rate	65.00%		53.00%
Collateral	$ 116,138	[1]	$ 26,707	[1]
Interest Rate	2.50%	[2]	1.65%	[2]
LIBOR [Member] | Deutsche Bank Warehouse Facility [Member]
Line of Credit Facility [Line Items]
Basis spread on variable interest rate	2.25%
LIBOR [Member] | Wells Fargo Warehouse Facility [Member]
Line of Credit Facility [Line Items]
Basis spread on variable interest rate	2.25%
LIBOR [Member] | RBS Warehouse Facility [Member]
Line of Credit Facility [Line Items]
Basis spread on variable interest rate	2.25%

[1] Collateral represents underlying pools of finance receivables pledged to each facility.

[2] Interest rate at period end equal to contractual benchmark plus index.