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Participations Sold (Details)
$ in Thousands, £ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Jun. 30, 2021
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
GBP (£)
Oct. 31, 2020
USD ($)
Participating Mortgage Loans [Line Items]                
Payment in kind interest   $ 10,200 $ 12,500 $ 40,700 $ 37,300      
Total carrying value, net   $ 7,257,304   $ 7,257,304   $ 6,496,977    
Mezzanine Loans                
Participating Mortgage Loans [Line Items]                
Debt instrument, decrease in participating interest $ 27,700              
Payment in kind interest $ 2,700              
Mezzanine Loans | Secured Debt                
Participating Mortgage Loans [Line Items]                
Total carrying value, net           94,600 £ 70.2  
Mezzanine Loans | Ground-up Condominium Development - New York                
Participating Mortgage Loans [Line Items]                
Debt instrument, face amount               $ 25,000
Mezzanine Loans | Office Building - London                
Participating Mortgage Loans [Line Items]                
Debt instrument, face amount           8,900 6.7  
Remaining unfunded commitment           $ 25,300 £ 19.1