Non Recourse Collateralized Financings (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Non-Recourse Debt	$ 31,295	$ 70,895
Fixed Interest Rate	6.20%
Secured Debt [Member]
Debt Instrument [Line Items]
Non-Recourse Debt	31,295
Unamortized net bond premium and deferred costs	(531)	(705)	[1]
Value of Collateral	33,691
Fixed Interest Rate		6.20%
Secured Debt [Member] | Federal Reserve Bank of New York, Term Asset-Backed Securities Loan Facility [Member]
Debt Instrument [Line Items]
Non-Recourse Debt		70,895	[1]
Value of Collateral		85,318	[1]
Federal Reserve Bank of New York, Term Asset-Backed Securities Loan Facility [Member]
Debt Instrument [Line Items]
Fixed Interest Rate		2.70%	[1]
Non-Agency CMBS [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Non-Recourse Debt	15,000	15,000
Value of Collateral	15,923	16,388
Weighted average life remaining, non-recourse debt	1 year 8 months 12 days	2 years 1 month 6 days
Non-Agency CMBS [Member] | Secured Debt [Member] | Federal Reserve Bank of New York, Term Asset-Backed Securities Loan Facility [Member]
Debt Instrument [Line Items]
Non-Recourse Debt		37,672	[1]
Value of Collateral		49,087	[1]
Weighted average life remaining, non-recourse debt		1 year 2 months 12 days
Residential Mortgage [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Non-Recourse Debt	16,826	18,928
Value of Collateral	$ 17,768	$ 19,843
Weighted average life remaining, non-recourse debt	3 years 1 month 6 days	3 years 2 months 12 days
Residential Mortgage [Member] | Secured Debt [Member] | One Month LIBOR [Member]
Debt Instrument [Line Items]
Basis Spread on Variable Rate Interest	0.30%	0.30%

[1] Financing provided by the Federal Reserve Bank of New York under its Term Asset-Backed Securities Loan Facility (“TALF”). The balance as of December 31, 2011 was paid off during the first quarter of 2012.