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Summary of Significant Accounting Policies - Real Estate Loans Receivable (Details)
Jun. 30, 2019
mezzanine_loan
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 1