Transactions with Related Parties (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended		6 Months Ended				6 Months Ended
	Jun. 30, 2012 CT Opportunity Partners I, LP	Jul. 31, 2008 CT Opportunity Partners I, LP	Jun. 30, 2012 EGI Private Equity II, L.L.C.	Jun. 30, 2012 W. R. Berkley Corporation	Jul. 31, 2007 W. R. Berkley Corporation	Nov. 09, 2006 W. R. Berkley Corporation	Jun. 30, 2012 CT Investment Management Co, LLC	Mar. 31, 2011 Five Mile
Related Party Transaction [Line Items]
Aggregate commitment agreements					$ 350,000	$ 250,000
Management fee percentage per annum on invested assets (as a percent)							25.00%
Allocated capital				534,000
Beneficially owned common stock and stock units (as a percent)				16.60%
Mezzanine loan to CT Legacy REIT in connection with restructuring								83,000
Total equity commitments		540,000
Limited partner interest (as a percent)			3.70%
Fees	1,300		54
CT CDO notes purchased face amount		75,500
CT CDO notes purchased amount	$ 40,400