Summary of Significant Accounting Policies - Real Estate Loans Receivable (Details) $ in Thousands	Mar. 31, 2020 mezzanine_loan	Jan. 01, 2020 USD ($)	Jan. 01, 2019 USD ($)
Property, Plant and Equipment [Line Items]
Cumulative effect of changes in accounting standards | $		$ (147)	$ (239)
Mezzanine Loan Receivable
Property, Plant and Equipment [Line Items]
Number of mezzanine loans collateralized	12
Construction Loans
Property, Plant and Equipment [Line Items]
Number of mezzanine loans collateralized	2
Term Loan Receivable
Property, Plant and Equipment [Line Items]
Number of mezzanine loans collateralized	2
Accounting Standards Update 2016-13 | Retained Earnings
Property, Plant and Equipment [Line Items]
Cumulative effect of changes in accounting standards | $		$ (100)