Consolidated Securitization Vehicles (Details 6) (USD $) In Thousands, unless otherwise specified			12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Consolidated Securization Vehicles		Dec. 31, 2012 Consolidated Securization Vehicles CT CDO I		Dec. 31, 2012 Consolidated Securization Vehicles GSMS 2006-FL8A
Principal Balance			$ 139,184		$ 91,311		$ 48,053
Book Value, beginning year	139,184	1,211,407	171,961		121,409		50,552
Book Value, ending year	$ 139,184	$ 1,211,407	$ 139,184		$ 91,311		$ 48,053
Coupon			1.42%	[1]	1.61%	[1]	1.07%	[1]
All-In Cost			1.44%	[1]	1.63%	[1]	1.07%	[1]
Maturity Date			Nov. 30, 2032	[2]	Jul. 31, 2039	[2]	Jun. 30, 2020	[2]

[1] Represents a weighted average for each respective facility, assuming LIBOR of 0.21% at December 31, 2012 for floating rate debt obligations.

[2] Maturity dates represent the contractual maturity of each debt obligation. Repayment of securitized debt is a function of collateral cash flows which are disbursed in accordance with the contractual provisions of each trust, and is generally expected to occur prior to the maturity date above.