Investments in Equity-Method Investees (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Summarized data of combined balance sheet and results of operations for our equity-method investees [Abstract]
Net income attributable to our equity investment in investee	$ 1,075	$ 2,406
Equity-Method Investees [Member]
Summarized data of combined balance sheet and results of operations for our equity-method investees [Abstract]
Loans and fees receivable pledged as collateral under structured financings, at fair value	20,538		22,571
Total assets	21,720		23,831
Total liabilities	66		82
Equity Method Investment Summarized Financial Information, Equity	21,654		23,749
Net interest income, fees and related income on earning assets	1,617	4,116
Total other operating income	0	49
Net income	1,407	3,780
Net income attributable to our equity investment in investee	1,075	2,406
Limited Liability Company [Member]
Schedule of Equity Method Investments [Line Items]
Equity-method investment, interests	66.70%
U.K. Portfolio Structured Financing Trust [Member]
Schedule of Equity Method Investments [Line Items]
Equity-method investment, interests	50.00%
Summarized data of combined balance sheet and results of operations for our equity-method investees [Abstract]
Investments in non-marketable debt securities, at fair value			0
Total assets			0
Total liabilities			0
Equity Method Investment Summarized Financial Information, Equity			0
Net interest income, fees and related income on earning assets		1,985
Net income		1,974
Net income attributable to our equity investment in investee		$ 987