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Loans Receivable - Collective Pool Basis (Details) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Mar. 31, 2020 USD ($) loan	Sep. 30, 2021 USD ($) loan	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) loan	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items]
Loan Carrying Value		$ 1,493,269		$ 1,493,269
Allowance for Credit Loss		(166,802)	$ (84,895)	(166,802)	$ (84,895)	$ (224,036)	$ (68,372)
Real estate loans receivable, net of credit allowance		$ 1,326,467		$ 1,326,467
No. of Loans \| loan		56		56
Provision for loan losses, net	$ 6,898	$ (271)	$ 2,857	$ 7,309	$ 11,351
Triple-net
Financing Receivable, Allowance for Credit Loss [Line Items]
No. of Loans \| loan	1
Deteriorated loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loan Carrying Value		178,301		178,301
Allowance for Credit Loss		(148,438)		(148,438)
Real estate loans receivable, net of credit allowance		$ 29,863		$ 29,863
No. of Loans \| loan		3		3
Collective loan pool
Financing Receivable, Allowance for Credit Loss [Line Items]
Loan Carrying Value		$ 201,939		$ 201,939
Allowance for Credit Loss		(3,061)		(3,061)
Real estate loans receivable, net of credit allowance		$ 198,878		$ 198,878
No. of Loans \| loan		17		17
Collective loan pool
Financing Receivable, Allowance for Credit Loss [Line Items]
Loan Carrying Value		$ 125,661		$ 125,661
Allowance for Credit Loss		(1,127)		(1,127)
Real estate loans receivable, net of credit allowance		$ 124,534		$ 124,534
No. of Loans \| loan		7		7
Collective loan pool
Financing Receivable, Allowance for Credit Loss [Line Items]
Loan Carrying Value		$ 23,263		$ 23,263
Allowance for Credit Loss		(346)		(346)
Real estate loans receivable, net of credit allowance		$ 22,917		$ 22,917
No. of Loans \| loan		2		2
Collective loan pool
Financing Receivable, Allowance for Credit Loss [Line Items]
Loan Carrying Value		$ 22,047		$ 22,047
Allowance for Credit Loss		(334)		(334)
Real estate loans receivable, net of credit allowance		$ 21,713		$ 21,713
No. of Loans \| loan		4		4
Collective loan pool
Financing Receivable, Allowance for Credit Loss [Line Items]
Loan Carrying Value		$ 46,335		$ 46,335
Allowance for Credit Loss		(703)		(703)
Real estate loans receivable, net of credit allowance		$ 45,632		$ 45,632
No. of Loans \| loan		6		6
Collective loan pool
Financing Receivable, Allowance for Credit Loss [Line Items]
Loan Carrying Value		$ 895,723		$ 895,723
Allowance for Credit Loss		(12,793)		(12,793)
Real estate loans receivable, net of credit allowance		$ 882,930		$ 882,930
No. of Loans \| loan		17		17