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Related Party Transactions (Details) $ in Thousands, € in Millions, £ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2023 USD ($) loan Rate	Mar. 31, 2023 USD ($) loan	Sep. 30, 2022 USD ($)	Sep. 30, 2022 GBP (£)	Sep. 30, 2023 USD ($) loan Rate	Sep. 30, 2022 USD ($)	Mar. 31, 2023 EUR (€)	Mar. 31, 2023 GBP (£)	Feb. 08, 2023 USD ($)	Dec. 31, 2022 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)
Related Party Transaction [Line Items]
Termination fee, percent fee of base management fee	300.00%				300.00%
Number of loans | loan	3				3
Total carrying value, net	$ 7,974,031				$ 7,974,031					$ 8,681,990
Increase in management fee payable					$ 11
Number of independent directors required | Rate	66.60%				66.60%
Atlas Facility
Related Party Transaction [Line Items]
Number of loans | loan	1				1
Secured Debt | Credit Suisse Facility | Line of Credit
Related Party Transaction [Line Items]
Line of credit facility, current borrowing capacity									$ 632,300
Secured Debt | Atlas Facility | Line of Credit
Related Party Transaction [Line Items]
Line of credit facility, current borrowing capacity	$ 83,000				$ 83,000
Commercial Mortgage and Subordinated Portfolio Segment
Related Party Transaction [Line Items]
Number of commercial mortgage loans | loan		3
Total carrying value, net	$ 102,600				$ 102,600					138,300
Mixed Use Property - London | Commercial Mortgage and Subordinated Portfolio Segment
Related Party Transaction [Line Items]
Off-balance-sheet, credit loss, liability, transfers			$ 327,700	£ 293.4
Total carrying value, net | £								£ 15.0
Various Properties In Europe | Commercial Mortgage and Subordinated Portfolio Segment
Related Party Transaction [Line Items]
Total carrying value, net		$ 219,000					€ 205.7
Mortgage loans on real estate, commercial and consumer, funded, net		$ 122,400					€ 115.0
Junior Mezzanine Loans
Related Party Transaction [Line Items]
Number of loans | loan	3				3
Arrangement fees
Related Party Transaction [Line Items]
Incentive Fee Payable											$ 400	$ 200
Management fees
Related Party Transaction [Line Items]
Increase in management fee payable						$ 57
Limited Liability Company
Related Party Transaction [Line Items]
Rate of management fees					1.50%
Extension period					1 year
Period of termination					180 days
Termination fee calculation period					24 months
Limited Liability Company | Management Agreement
Related Party Transaction [Line Items]
Payable to related party	$ 9,500				$ 9,500					$ 9,700
Affiliated Entity
Related Party Transaction [Line Items]
Debt instrument, face amount												$ 30,000
Affiliated Entity | Management Agreement
Related Party Transaction [Line Items]
Management fees to related party	9,500		9,700		28,400	28,600
Professional and Contract Services Expense	$ 800		$ 900		$ 2,100	$ 3,100

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