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Real Estate - Properties Held For Sale (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
property
Dec. 31, 2015
USD ($)
property
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Long Lived Assets Held-for-sale [Line Items]        
Number of properties held-for-sale | property   0    
Mortgage loans on real estate $ 276,163 $ 147,188 $ 102,286 $ 126,656
Fund II [Member]        
Long Lived Assets Held-for-sale [Line Items]        
Properties held-for-sale $ 21,500      
Number of properties held-for-sale | property 1      
Mortgage loans on real estate $ 25,500      
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Fund II [Member]        
Long Lived Assets Held-for-sale [Line Items]        
Properties held for sale net income (loss) $ 400 $ 300 $ 600