Annual report pursuant to Section 13 and 15(d)

Borrowings - MetLife Facility (Narrative) (Details)

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Borrowings - MetLife Facility (Narrative) (Details) - MetLife Credit Facility
12 Months Ended
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]  
Debt instrument, face amount $ 200,000,000
Line of credit facility, maximum borrowing capacity $ 75,000,000
Debt instrument, loans to value ratios percentage 60.00%
Notes payable to bank  
Debt Instrument [Line Items]  
Debt instrument, face amount $ 200,000,000