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Real Estate Loans Receivable - Collective Pool Basis (Details) $ in Thousands	Mar. 31, 2020 USD ($) loan	Dec. 31, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items]
Loan Carrying Value	$ 674,978
Allowance for Credit Loss	(80,571)	$ (68,372)	$ (87,062)	$ (68,372)
Real estate loans receivable, net of credit allowance	$ 594,407
No. of Loans \| loan	40
Deteriorated loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loan Carrying Value	$ 185,982
Allowance for Credit Loss	(75,372)
Real estate loans receivable, net of credit allowance	$ 110,610
No. of Loans \| loan	4
Collective loan pool
Financing Receivable, Allowance for Credit Loss [Line Items]
Loan Carrying Value	$ 128,971
Allowance for Credit Loss	(1,873)
Real estate loans receivable, net of credit allowance	$ 127,098
No. of Loans \| loan	15
Collective Loan Pool
Financing Receivable, Allowance for Credit Loss [Line Items]
Loan Carrying Value	$ 183,218
Allowance for Credit Loss	(1,534)
Real estate loans receivable, net of credit allowance	$ 181,684
No. of Loans \| loan	6
Collective loan pool
Financing Receivable, Allowance for Credit Loss [Line Items]
Loan Carrying Value	$ 117,156
Allowance for Credit Loss	(970)
Real estate loans receivable, net of credit allowance	$ 116,186
No. of Loans \| loan	7
Collective loan pool
Financing Receivable, Allowance for Credit Loss [Line Items]
Loan Carrying Value	$ 15,865
Allowance for Credit Loss	(229)
Real estate loans receivable, net of credit allowance	$ 15,636
No. of Loans \| loan	2
Collective loan pool
Financing Receivable, Allowance for Credit Loss [Line Items]
Loan Carrying Value	$ 43,786
Allowance for Credit Loss	(593)
Real estate loans receivable, net of credit allowance	$ 43,193
No. of Loans \| loan	6