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Loans Receivable (Collective Pool Basis) (Details) $ in Thousands	Dec. 31, 2020 USD ($) loan	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Credit Loss	$ (224,036)	$ (68,372)	$ (68,372)	$ (68,372)
Real estate loans receivable, net of credit allowance	443,372	$ 270,382
Deteriorated loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Real estate loans receivable, gross	242,319
Allowance for Credit Loss	(212,514)
Real estate loans receivable, net of credit allowance	$ 29,805
No. of Loans \| loan	6
Collective loan pool
Financing Receivable, Allowance for Credit Loss [Line Items]
Real estate loans receivable, gross	$ 130,436
Allowance for Credit Loss	(2,452)
Real estate loans receivable, net of credit allowance	$ 127,984
No. of Loans \| loan	14
Collective loan pool
Financing Receivable, Allowance for Credit Loss [Line Items]
Real estate loans receivable, gross	$ 126,465
Allowance for Credit Loss	(2,381)
Real estate loans receivable, net of credit allowance	$ 124,084
No. of Loans \| loan	4
Collective loan pool
Financing Receivable, Allowance for Credit Loss [Line Items]
Real estate loans receivable, gross	$ 126,792
Allowance for Credit Loss	(1,429)
Real estate loans receivable, net of credit allowance	$ 125,363
No. of Loans \| loan	7
Collective loan pool
Financing Receivable, Allowance for Credit Loss [Line Items]
Real estate loans receivable, gross	$ 19,923
Allowance for Credit Loss	(374)
Real estate loans receivable, net of credit allowance	$ 19,549
No. of Loans \| loan	1
Collective loan pool
Financing Receivable, Allowance for Credit Loss [Line Items]
Real estate loans receivable, gross	$ 48,819
Allowance for Credit Loss	(886)
Real estate loans receivable, net of credit allowance	$ 47,933
No. of Loans \| loan	7
Collective loan pool
Financing Receivable, Allowance for Credit Loss [Line Items]
Real estate loans receivable, gross	$ 212,923
Allowance for Credit Loss	(4,000)
Real estate loans receivable, net of credit allowance	$ 208,923
No. of Loans \| loan	9
Real Estate Loan
Financing Receivable, Allowance for Credit Loss [Line Items]
Real estate loans receivable, gross	$ 907,677
Allowance for Credit Loss	(224,036)
Real estate loans receivable, net of credit allowance	$ 683,641
No. of Loans \| loan	48