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Subsequent Event (Details) - Subsequent Event [Member] - $ / shares
Oct. 10, 2018
Sep. 20, 2018
Aug. 16, 2018
Subsequent Event [Line Items]      
Dividends payable, date declared     Aug. 16, 2018
Dividends per share (in dollars per share)     $ 0.55
Dividends payable, date to be paid Oct. 10, 2018    
Dividends payable, date of record   Sep. 20, 2018