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Commercial Mortgage Loans, Subordinate Loans and Other Lending Assets, Net - Cost Recovery Loans (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]
Specific CECL allowance	$ 193,000,000		$ 193,000,000		$ 133,500,000
Amortized cost	$ 711,600,000		$ 711,600,000		$ 468,000,000
Equity contribution rate	90.00%		90.00%
Payment in kind interest	$ 0	$ 4,500,000	$ 0	$ 5,700,000
Turner Consulting
Financing Receivable, Credit Quality Indicator [Line Items]
Equity contribution rate	10.00%		10.00%
Retail Center - Cincinnati, OH
Financing Receivable, Credit Quality Indicator [Line Items]
Payment in kind interest	$ 700,000	$ 300,000	$ 1,300,000	$ 600,000
Retail Center - Cincinnati, OH | Capitalization Rate
Financing Receivable, Credit Quality Indicator [Line Items]
Loan collateral, measurement input	0.085		0.085
Residential-for-Sale - Manhattan, NY | Discount Rate
Financing Receivable, Credit Quality Indicator [Line Items]
Loan collateral, measurement input	0.10		0.10
Mortgage, Amortized cost
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost prior to Specific CECL Allowance	$ 165,237,000		$ 165,237,000
Specific CECL allowance	67,000,000		67,000,000
Amortized cost	98,237,000		98,237,000
Mortgage, Amortized cost | Retail Center - Cincinnati, OH
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost prior to Specific CECL Allowance	165,237,000		165,237,000
Specific CECL allowance	67,000,000		67,000,000
Amortized cost	98,237,000		98,237,000
Mezzanine Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost prior to Specific CECL Allowance	295,881,000		295,881,000
Specific CECL allowance	126,000,000		126,000,000
Amortized cost	169,881,000		169,881,000
Payment in kind interest			36,100,000
Mezzanine Loans | Residential-for-Sale - Manhattan, NY
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost prior to Specific CECL Allowance	295,881,000		295,881,000
Specific CECL allowance	126,000,000		126,000,000
Amortized cost	169,881,000		169,881,000
Real Estate and Mezzanine
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost prior to Specific CECL Allowance	461,118,000		461,118,000
Specific CECL allowance	193,000,000		193,000,000
Amortized cost	$ 268,118,000		$ 268,118,000

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