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Condensed Consolidated Statement of Equity (Parenthetical) - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Statement of Stockholders' Equity [Abstract]        
Cash dividends paid per share (in dollars per share) $ 0.29 $ 0.26 $ 0.87 $ 0.78