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Credit Facilities - Secured Credit Facility (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Secured Credit    
Credit Facilities    
Maximum borrowing capacity $ 5.0  
Borrowing outstanding 0.0 $ 0.0
Unsecured Credit    
Credit Facilities    
Maximum borrowing capacity 5.0  
Borrowing outstanding $ 0.0 $ 0.0