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Participations Sold (Details)
$ in Thousands, £ in Millions
Dec. 31, 2020
USD ($)
Dec. 31, 2020
GBP (£)
Oct. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Participating Mortgage Loans [Line Items]        
Total carrying value, net $ 6,496,977     $ 6,375,093
Mezzanine, Amortized cost | Secured Debt        
Participating Mortgage Loans [Line Items]        
Total carrying value, net 96,100 £ 70.3 $ 85,700  
Mezzanine, Amortized cost | Ground-up Condominium Development - New York        
Participating Mortgage Loans [Line Items]        
Debt instrument, face amount     $ 25,000  
Mezzanine, Amortized cost | Office Building - London        
Participating Mortgage Loans [Line Items]        
Debt instrument, face amount 8,900 6.7    
Remaining unfunded commitment $ 25,300 £ 19.1