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Loans Receivable and Other Lending Investments, net - Impaired Loans (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($) Loan	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) Loan	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($) Loan
Financing Receivable, Allowance for Credit Loss [Line Items]
Number of non accrual loans | Loan	2		2		1
Interest income on Impaired loans	$ 0	$ 0	$ 0	$ 0
Commercial Portfolio Segment
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost with related allowance recorded	87,277,000		87,277,000		$ 37,820,000
Unpaid principal balance with related allowance recorded	86,627,000		86,627,000		37,923,000
Related Allowance with an allowance recorded	(22,600,000)		(22,600,000)		(21,701,000)
Commercial Portfolio Segment | Senior mortgages
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost with related allowance recorded	87,277,000		87,277,000		37,820,000
Unpaid principal balance with related allowance recorded	86,627,000		86,627,000		37,923,000
Related Allowance with an allowance recorded	$ (22,600,000)		$ (22,600,000)		$ (21,701,000)

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-Section 50
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