Fair Value of Financial Instruments (Details 2) (USD $) In Thousands, unless otherwise specified					6 Months Ended
	Jun. 30, 2013		Dec. 31, 2012		Jun. 30, 2013 Collateralized Debt Obligations Bonds [Member]	Jun. 30, 2013 Minimum [Member] Collateralized Debt Obligations Bonds [Member]	Jun. 30, 2013 Maximum [Member] Collateralized Debt Obligations Bonds [Member]
Retained CDO Bonds, Fair Value	$ 7,645	[1]	$ 0	[1]	$ 7,645
Retained CDO Bonds, Valuation Technique					Discounted cash flows
Retained CDO Bonds, Unobservable Inputs					Discount rate
Retained CDO Bonds, Discount Rate Range						25.00%	40.00%

[1] Retained CDO Bonds represent the CDOs' subordinate bonds, preferred shares, and ordinary shares, which were retained subsequent to the disposal of Gramercy Finance and were previously eliminated in consolidation.