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Borrowings - Credit Facility (Narrative) (Details) - Revolving credit facility - Initial Credit Facility - USD ($)
3 Months Ended 6 Months Ended
Feb. 10, 2017
Jun. 30, 2017
Jun. 30, 2017
Dec. 31, 2017
Line of Credit Facility [Line Items]        
Term of credit facility 2 years      
Line of credit facility, maximum borrowing capacity $ 50,000,000      
Maximum borrowing capacity upon request and successful syndication $ 100,000,000      
Borrowings under the credit facility       $ 0
Commitment fees within interest expense   $ 64,000 $ 98,000  
Amortization of fees   $ 45,000 $ 75,000