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Commercial Mortgage, Subordinate Loans and Other Lending Assets, Net - Cost Recovery Loans (Details) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2020 USD ($) $ / ft²	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) $ / ft²	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost		$ 408,666		$ 408,666		$ 136,300
Loan specific reserves		196,931		196,931		$ 56,981
Provision for loan losses	[1]	(6,342)	$ 35,000	151,954	$ 20,000
Payment in kind interest		12,500	$ 13,700	37,300	$ 42,800
Specific CECL Allowance		$ 550		$ (139,950)
Minimum | Hotel | Discount Rate
Financing Receivable, Credit Quality Indicator [Line Items]
Loan collateral, measurement input		0.085		0.085
Minimum | Hotel | Capitalization Rate
Financing Receivable, Credit Quality Indicator [Line Items]
Loan collateral, measurement input		0.070		0.070
Minimum | Urban Predevelopment | Capitalization Rate
Financing Receivable, Credit Quality Indicator [Line Items]
Loan collateral, measurement input		0.050		0.050
Minimum | Urban Predevelopment | Dollars per Square Foot
Financing Receivable, Credit Quality Indicator [Line Items]
Loan collateral, measurement input | $ / ft²		48		48
Maximum | Hotel | Discount Rate
Financing Receivable, Credit Quality Indicator [Line Items]
Loan collateral, measurement input		0.110		0.110
Maximum | Hotel | Capitalization Rate
Financing Receivable, Credit Quality Indicator [Line Items]
Loan collateral, measurement input		0.090		0.090
Maximum | Urban Predevelopment | Capitalization Rate
Financing Receivable, Credit Quality Indicator [Line Items]
Loan collateral, measurement input		0.055		0.055
Maximum | Urban Predevelopment | Dollars per Square Foot
Financing Receivable, Credit Quality Indicator [Line Items]
Loan collateral, measurement input | $ / ft²		225		225
Retail Center - Cincinnati, OH
Financing Receivable, Credit Quality Indicator [Line Items]
Payment in kind interest		$ 400		$ 1,100
Retail Center - Cincinnati, OH | Capitalization Rate
Financing Receivable, Credit Quality Indicator [Line Items]
Loan collateral, measurement input		0.083		0.083
Residential-For-Sale - Bethesda, MD
Financing Receivable, Credit Quality Indicator [Line Items]
Specific CECL Allowance		$ 1,900
Hotel - Washington D.C.
Financing Receivable, Credit Quality Indicator [Line Items]
Payment in kind interest		200		$ 200
Mortgage, Amortized cost
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost		380,856		380,856
Mortgage, Amortized cost | Urban Predevelopment - Brooklyn, NY
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost		128,418		128,418
Mortgage, Amortized cost | Urban Predevelopment - Miami, FL
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost		114,910		114,910
Mortgage, Amortized cost | Retail Center - Cincinnati, OH
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost		105,561		105,561
Mortgage, Amortized cost | Hotel - Pittsburgh, PA
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost		28,872		28,872
Mortgage, Amortized cost | Residential-For-Sale - Bethesda, MD
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost		3,095		3,095
Provision previously recorded under other assets				3,000
Mezzanine, Amortized cost
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost		27,810		27,810
Mezzanine, Amortized cost | Hotel - Washington D.C.
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost		18,430		18,430
Mezzanine, Amortized cost | Hotel - Anaheim, CA
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost		$ 9,380		$ 9,380
[1] Comprised of $550 and $(139,950) of Specific CECL Reversal (Allowance) and $5,792 and $(12,004) of General CECL Reversal (Allowance) for the three and nine months ended September 30, 2020, respectively.

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