Annual report pursuant to Section 13 and 15(d)

Borrowings - Individual Metlife Notes (Details)

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Borrowings - Individual Metlife Notes (Details)
1 Months Ended 12 Months Ended
May 31, 2017
USD ($)
May 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]      
Professional fees     $ 713,000
MetLife Facility      
Debt Instrument [Line Items]      
Debt instrument, face amount     $ 200,000,000
Term Notes | MetLife Facility      
Debt Instrument [Line Items]      
Debt Instrument, loans to value ratios percentage     60.00%
Term Notes | Metlife Term Loans      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 15,300,000 $ 15,300,000  
Debt instrument, term 28 years 7 months    
Debt Instrument, loans to value ratios percentage     60.00%
Loan processing fee   38,000  
Professional fees   $ 38,000  
Number of collateralized properties     4
Book value of collateralized asset     $ 28,200,000
Metlife      
Debt Instrument [Line Items]      
Number of collateralized properties     33
Book value of collateralized asset     $ 187,400,000