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Loans Receivable - Collective Pool Basis (Details) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Mar. 31, 2020 USD ($) loan	Jun. 30, 2021 USD ($) loan	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) loan	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items]
Loan Carrying Value		$ 1,463,095		$ 1,463,095
Allowance for Credit Loss		(167,432)	$ (81,985)	(167,432)	$ (81,985)	$ (224,036)	$ (68,372)
Real estate loans receivable, net of credit allowance		$ 1,295,663		$ 1,295,663
No. of Loans \| loan		49		49
Provision for loan losses	$ 6,898	$ 6,197	$ 1,422	$ 7,580	$ 8,494
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		178,253		178,253
Allowance for Credit Loss		(148,438)		(148,438)
Real estate loans receivable, net of credit allowance		$ 29,815		$ 29,815
No. of Loans \| loan		3		3
Collective loan pool
Financing Receivable, Allowance for Credit Loss [Line Items]
Loan Carrying Value		$ 198,975		$ 198,975
Allowance for Credit Loss		(3,033)		(3,033)
Real estate loans receivable, net of credit allowance		$ 195,942		$ 195,942
No. of Loans \| loan		17		17
Collective loan pool
Financing Receivable, Allowance for Credit Loss [Line Items]
Loan Carrying Value		$ 126,493		$ 126,493
Allowance for Credit Loss		(1,182)		(1,182)
Real estate loans receivable, net of credit allowance		$ 125,311		$ 125,311
No. of Loans \| loan		7		7
Collective loan pool
Financing Receivable, Allowance for Credit Loss [Line Items]
Loan Carrying Value		$ 20,652		$ 20,652
Allowance for Credit Loss		(324)		(324)
Real estate loans receivable, net of credit allowance		$ 20,328		$ 20,328
No. of Loans \| loan		1		1
Collective loan pool
Financing Receivable, Allowance for Credit Loss [Line Items]
Loan Carrying Value		$ 22,046		$ 22,046
Allowance for Credit Loss		(347)		(347)
Real estate loans receivable, net of credit allowance		$ 21,699		$ 21,699
No. of Loans \| loan		4		4
Collective loan pool
Financing Receivable, Allowance for Credit Loss [Line Items]
Loan Carrying Value		$ 49,352		$ 49,352
Allowance for Credit Loss		(770)		(770)
Real estate loans receivable, net of credit allowance		$ 48,582		$ 48,582
No. of Loans \| loan		8		8
Collective loan pool
Financing Receivable, Allowance for Credit Loss [Line Items]
Loan Carrying Value		$ 867,324		$ 867,324
Allowance for Credit Loss		(13,338)		(13,338)
Real estate loans receivable, net of credit allowance		$ 853,986		$ 853,986
No. of Loans \| loan		9		9