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Participations Sold (Details) $ in Thousands, £ in Millions	1 Months Ended	3 Months Ended
	Jun. 30, 2021 USD ($)	Mar. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2020 GBP (£)	Oct. 31, 2020 USD ($)
Participating Mortgage Loans [Line Items]
Payment in kind interest		$ 1,200	$ 16,800
Total carrying value, net		8,350,042		$ 7,857,260
Participating mortgage loans, participation liabilities, amount decrease		$ 800
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					$ 92,700	£ 70.5
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

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Face (par) amount of debt instrument at time of issuance.

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The balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio.

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Interest paid other than in cash for example by issuing additional debt securities. As a noncash item, it is added to net income when calculating cash provided by or used in operations using the indirect method.

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