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Subsequent Events (Details) - USD ($)
3 Months Ended
Nov. 14, 2018
Aug. 14, 2018
Jun. 01, 2018
Sep. 30, 2018
Jun. 30, 2018
Oct. 31, 2018
Subsequent Event [Line Items]            
Cash dividend per common share (in dollars per share)   $ 0.05 $ 0.05 $ 0.05 $ 0.05  
Subsequent event            
Subsequent Event [Line Items]            
Cash dividend per common share (in dollars per share) $ 0.05          
MARPA Facility | Line of Credit | Subsequent event            
Subsequent Event [Line Items]            
Maximum borrowing capacity           $ 300,000,000