Transactions with Related Parties (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended		9 Months Ended				9 Months Ended
	Sep. 30, 2012 CT Opportunity Partners I, LP	Jul. 31, 2008 CT Opportunity Partners I, LP	Sep. 30, 2012 EGI Private Equity II, L.L.C.	Sep. 30, 2012 W. R. Berkley Corporation	Jul. 31, 2007 W. R. Berkley Corporation	Nov. 09, 2006 W. R. Berkley Corporation	Sep. 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				594,000
Beneficially owned common stock and stock units (as a percent)				15.40%
Mezzanine loan to CT Legacy REIT in connection with restructuring								83,000
Total equity commitments		539,900
Limited partner interest (as a percent)			3.70%
Fees	2,000		80
CT CDO notes purchased face amount		75,500
CT CDO notes purchased amount	$ 40,400