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Equity - Additional Information (Details) - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Statement of Stockholders' Equity [Abstract]        
Cash dividends declared on common stock (in dollars per share) $ 0.48 $ 0.47 $ 1.44 $ 1.41