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Subsequent Events (Details) - $ / shares
3 Months Ended 9 Months Ended
Oct. 26, 2017
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Subsequent Event [Line Items]          
Dividends declared per share (usd per share)   $ 0.29 $ 0.28 $ 0.86 $ 0.83
Subsequent Event [Member]          
Subsequent Event [Line Items]          
Dividends declared per share (usd per share) $ 0.29