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Participations Sold (Details)
£ in Thousands
1 Months Ended 9 Months Ended
Jan. 31, 2015
USD ($)
facility
Sep. 30, 2016
USD ($)
Sep. 30, 2016
GBP (£)
Dec. 31, 2015
USD ($)
Feb. 28, 2015
USD ($)
Feb. 28, 2015
GBP (£)
Jan. 31, 2015
GBP (£)
Sep. 30, 2014
USD ($)
Aug. 31, 2014
USD ($)
May 31, 2014
USD ($)
Mortgage Loans on Real Estate [Line Items]                    
Carrying amount of mortgage loan   $ 110,924,000   $ 118,201,000            
Commercial Mortgage Portfolio Segment [Member] | Mezzanine Loan, Acquired by Investment Funds [Member]                    
Mortgage Loans on Real Estate [Line Items]                    
Mortgage loan, face amount   25,459,000 £ 19,626   $ 30,672,000 £ 20,000        
Carrying amount of mortgage loan   25,459,000 £ 19,626              
Hotel [Member] | Hotel - Aruba [Member] | Subordinate Mortgage Portfolio Segment [Member] | First Mortgage [Member]                    
Mortgage Loans on Real Estate [Line Items]                    
Mortgage loan, face amount                   $ 155,000,000
Senior Participation [Member] | Hotel [Member] | Hotel - Aruba [Member] | Subordinate Mortgage Portfolio Segment [Member]                    
Mortgage Loans on Real Estate [Line Items]                    
Participation in loan, amount               $ 90,000,000 $ 90,000,000  
Junior Participation [Member] | Hotel [Member] | Hotel - Aruba [Member] | Subordinate Mortgage Portfolio Segment [Member]                    
Mortgage Loans on Real Estate [Line Items]                    
Participation in loan, amount               $ 65,000,000 $ 65,000,000  
Participating Mortgages [Member] | Subordinate Mortgage Portfolio Segment [Member]                    
Mortgage Loans on Real Estate [Line Items]                    
Mortgage loan, face amount   85,517,000                
Carrying amount of mortgage loan   $ 85,465,000                
London Interbank Offered Rate (LIBOR) [Member] | Commercial Mortgage Portfolio Segment [Member] | Mezzanine Loan, Acquired by Investment Funds [Member]                    
Mortgage Loans on Real Estate [Line Items]                    
Basis point   8.25%                
London Interbank Offered Rate (LIBOR) [Member] | Participating Mortgages [Member] | Subordinate Mortgage Portfolio Segment [Member]                    
Mortgage Loans on Real Estate [Line Items]                    
Basis point   4.40%                
United Kingdom [Member] | Senior Housing Facility [Member] | Commercial Mortgage Portfolio Segment [Member] | Mezzanine Loan [Member]                    
Mortgage Loans on Real Estate [Line Items]                    
Mortgage loan, face amount $ 51,996,000           £ 34,519      
Number of properties | facility 44