Annual report pursuant to Section 13 and 15(d)

Borrowings - Individual MetLife Notes (Details)

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Borrowings - Individual MetLife Notes (Details) - MetLife Term Loans - USD ($)
$ in Thousands
12 Months Ended
May 31, 2017
Dec. 31, 2018
Debt Instrument [Line Items]    
Debt instrument, loans to value ratios percentage   60.00%
Notes payable to bank    
Debt Instrument [Line Items]    
Principal Outstanding $ 14,765  
Term of debt 28 years 7 months  
Minimum | Notes payable to bank    
Debt Instrument [Line Items]    
Interest rate (as percent) 3.55%  
Maximum | Notes payable to bank    
Debt Instrument [Line Items]    
Interest rate (as percent) 3.85%