Consolidated Securitization Vehicles (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011
Net book value	$ 141,500		$ 838,394
Consolidated Securization Vehicles | Loans Receivable
Number of investments	7		12
Principal balance	164,180		228,151
Net book value	$ 141,500		$ 145,491
Coupon	4.73%	[1],[2]	3.40%	[1],[2]
Yield	4.74%	[1],[2]	3.28%	[1],[2]
Maturity (years)	8 months	[1],[3]	1 year	[1],[3]

[1] Represents a weighted average as of December 31, 2012 and 2011, respectively.

[2] All loan are floating rate loans as of both December 31, 2012 and 2011. Calculations are based on LIBOR of 0.21% and 0.30% as of December 31, 2012 and 2011, respectively.

[3] For loans in CT CDO I, assumes all extension options are executed. For loans in GSMS 2006-FL8A, maturity is based on information provided by its trustee.