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Participations Sold (Details) $ in Thousands, £ in Millions	1 Months Ended	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2020 GBP (£)	Oct. 31, 2020 USD ($)
Participating Mortgage Loans [Line Items]
Payment in kind interest		$ 13,700	$ 12,400	$ 30,600	$ 24,800
Total carrying value, net	$ 7,520,105	$ 7,520,105	$ 6,496,977	$ 7,520,105	$ 6,496,977	$ 6,496,977
Mezzanine Loans
Participating Mortgage Loans [Line Items]
Payment in kind interest	2,700
Debt Instrument, Decrease In Participating Interest	$ 27,700
Mezzanine Loans | Secured Debt
Participating Mortgage Loans [Line Items]
Total carrying value, net						97,700	£ 70.7
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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