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Loans Receivable and Other Lending Investments, net (Impaired Loans) (Details)	3 Months Ended		12 Months Ended
	Dec. 31, 2020 USD ($) loan	Jun. 30, 2018 USD ($)	Dec. 31, 2020 USD ($) loan	Dec. 31, 2019 USD ($) loan	Dec. 31, 2018 USD ($)
Financing Receivable, Impaired [Line Items]
Preferred equity investment received, face value		$ 100,000,000.0
Preferred equity investment mandatory redemption period		5 years
Preferred equity investment received, recorded fair value		$ 77,000,000.0
Provision for loan losses			$ 9,052,000	$ 6,482,000	$ 16,937,000
Impaired Loans
Number of non-accrual loans | loan	1		1	1
Interest income on impaired loans			$ 0	$ 0	0
Commercial Portfolio Segment
Impaired Loans
Impaired loans with allowance recorded, recorded investment	$ 53,305,000		53,305,000	37,820,000
Impaired loans with allowance recorded, unpaid principal balance	52,552,000		52,552,000	37,923,000
Impaired loans with allowance recorded, related allowance	(743,000)		(743,000)	(21,701,000)
Impaired loans with no related allowance recorded, average recorded investment			0	0	0
Impaired loans with no related allowance recorded, interest income recognized			0	0	301,000
Impaired loans with allowance recorded, average recorded investment			50,205,000	38,556,000	106,210,000
Impaired loans with allowance recorded, interest income recognized			2,145,000	0	0
Impaired loans, average recorded investment, total			50,205,000	38,556,000	106,210,000
Impaired loans, interest income recognized, total			2,145,000	0	301,000
Commercial Portfolio Segment | Subordinate mortgages
Impaired Loans
Impaired loans with no related allowance recorded, average recorded investment			0	0	0
Impaired loans with no related allowance recorded, interest income recognized			0	0	301,000
Impaired loans, average recorded investment, total			0	0	0
Impaired loans, interest income recognized, total			0	0	301,000
Commercial Portfolio Segment | Senior mortgages
Impaired Loans
Impaired loans with allowance recorded, recorded investment	53,305,000		53,305,000	37,820,000
Impaired loans with allowance recorded, unpaid principal balance	52,552,000		52,552,000	37,923,000
Impaired loans with allowance recorded, related allowance	(743,000)		(743,000)	(21,701,000)
Impaired loans with allowance recorded, average recorded investment			50,205,000	38,556,000	67,041,000
Impaired loans with allowance recorded, interest income recognized			2,145,000	0	0
Impaired loans, average recorded investment, total			50,205,000	38,556,000	67,041,000
Impaired loans, interest income recognized, total			2,145,000	0	0
Commercial Portfolio Segment | Corporate/Partnership loans
Impaired Loans
Impaired loans with allowance recorded, average recorded investment			0	0	39,169,000
Impaired loans with allowance recorded, interest income recognized			0	0	0
Impaired loans, average recorded investment, total			0	0	39,169,000
Impaired loans, interest income recognized, total			0	$ 0	$ 0
Nonperforming Financial Instruments | Senior mortgages
Financing Receivable, Impaired [Line Items]
Gross carrying value of loan	15,200,000		$ 15,200,000
Proceeds from collection of loan receivable	11,000,000.0
Provision for loan losses	$ 4,200,000
Nonperforming Financial Instruments | Corporate/Partnership loans
Financing Receivable, Impaired [Line Items]
Gross carrying value of loan		145,800,000
Proceeds from collection of loan receivable		45,800,000
Provision for loan losses		$ 21,400,000

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