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Loans Receivable - Collective Pool Basis (Details) $ in Thousands	Mar. 31, 2022 USD ($) loan	Dec. 31, 2021 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items]
Loan Carrying Value	$ 1,407,852
Allowance for Credit Loss	(165,693)	$ (166,785)	$ (224,146)	$ (224,036)
Real estate loans receivable, net of credit allowance	$ 1,242,159
No. of Loans \| loan	55
Deteriorated loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loan Carrying Value	$ 174,841
Allowance for Credit Loss	(148,438)
Real estate loans receivable, net of credit allowance	$ 26,403
No. of Loans \| loan	3
Collective loan pool
Financing Receivable, Allowance for Credit Loss [Line Items]
Loan Carrying Value	$ 209,774
Allowance for Credit Loss	(2,982)
Real estate loans receivable, net of credit allowance	$ 206,792
No. of Loans \| loan	15
Collective loan pool
Financing Receivable, Allowance for Credit Loss [Line Items]
Loan Carrying Value	$ 22,800
Allowance for Credit Loss	(325)
Real estate loans receivable, net of credit allowance	$ 22,475
No. of Loans \| loan	2
Collective loan pool
Financing Receivable, Allowance for Credit Loss [Line Items]
Loan Carrying Value	$ 22,084
Allowance for Credit Loss	(315)
Real estate loans receivable, net of credit allowance	$ 21,769
No. of Loans \| loan	4
Collective loan pool
Financing Receivable, Allowance for Credit Loss [Line Items]
Loan Carrying Value	$ 50,563
Allowance for Credit Loss	(721)
Real estate loans receivable, net of credit allowance	$ 49,842
No. of Loans \| loan	6
Collective loan pool
Financing Receivable, Allowance for Credit Loss [Line Items]
Loan Carrying Value	$ 894,186
Allowance for Credit Loss	(12,433)
Real estate loans receivable, net of credit allowance	$ 881,753
No. of Loans \| loan	20
Collective loan pool
Financing Receivable, Allowance for Credit Loss [Line Items]
Loan Carrying Value	$ 33,604
Allowance for Credit Loss	(479)
Real estate loans receivable, net of credit allowance	$ 33,125
No. of Loans \| loan	5