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Participations Sold (Details)
£ in Thousands, $ in Thousands
1 Months Ended 3 Months Ended
Jan. 31, 2015
USD ($)
facility
Mar. 31, 2016
USD ($)
Mar. 31, 2016
GBP (£)
Dec. 31, 2015
USD ($)
Feb. 28, 2015
USD ($)
Feb. 28, 2015
GBP (£)
Jan. 31, 2015
GBP (£)
Aug. 31, 2014
USD ($)
Jun. 30, 2014
USD ($)
May. 31, 2014
USD ($)
Mortgage Loans on Real Estate [Line Items]                    
Carrying amount of mortgage loan   $ 116,952   $ 118,201            
Commercial mortgage loans [Member]                    
Mortgage Loans on Real Estate [Line Items]                    
Mortgage loan, face amount   1,232,287   1,037,940            
Commercial mortgage loans [Member] | Mezzanine Loan, Acquired by Investment Funds [Member]                    
Mortgage Loans on Real Estate [Line Items]                    
Mortgage loan, face amount   28,432 £ 19,799   $ 30,672 £ 20,000        
Carrying amount of mortgage loan   28,432 £ 19,799              
Subordinate loans [Member]                    
Mortgage Loans on Real Estate [Line Items]                    
Mortgage loan, face amount   966,164   $ 964,955            
Hotel [Member] | Hotel - Aruba [Member] | Subordinate loans [Member] | First Mortgage [Member]                    
Mortgage Loans on Real Estate [Line Items]                    
Mortgage loan, face amount                   $ 155,000
Senior Participation [Member] | Hotel [Member] | Hotel - Aruba [Member] | Subordinate loans [Member]                    
Mortgage Loans on Real Estate [Line Items]                    
Participation in loan, amount               $ 90,000 $ 90,000  
Junior Participation [Member] | Hotel [Member] | Hotel - Aruba [Member] | Subordinate loans [Member]                    
Mortgage Loans on Real Estate [Line Items]                    
Participation in loan, amount               $ 65,000 $ 65,000  
Participating Mortgages [Member] | Subordinate loans [Member]                    
Mortgage Loans on Real Estate [Line Items]                    
Mortgage loan, face amount   88,548                
Carrying amount of mortgage loan   $ 88,520                
London Interbank Offered Rate (LIBOR) [Member] | Commercial mortgage loans [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 loans [Member]                    
Mortgage Loans on Real Estate [Line Items]                    
Basis point   4.40%                
United Kingdom [Member] | Senior Housing Facility [Member] | Commercial mortgage loans [Member] | Mezzanine Loan [Member]                    
Mortgage Loans on Real Estate [Line Items]                    
Mortgage loan, face amount $ 51,996           £ 34,519      
Number of properties | facility 44