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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) - $ / shares
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Statement of Stockholders' Equity [Abstract]    
Cash dividends (in dollars per share) $ 0.61 $ 0.52
Common stock (purchased) sold by directors' deferred compensation plan (in net shares) 16,950 12,020
Shares of common stock repurchased 849,290 697,483