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Condensed Consolidated Statement of Equity (Parenthetical) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Statement of Stockholders' Equity [Abstract]          
Cash dividends paid per share (in dollars per share) $ 0.32 $ 0.32 $ 0.29 $ 0.64 $ 0.58