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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) - $ / shares
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Statement of Stockholders' Equity [Abstract]    
Cash dividends (in dollars per share) $ 0.52 $ 0.44
Common stock (purchased) sold by directors' deferred compensation plan (in net shares) 12,020 22,800
Shares of common stock repurchased 697,483 636,922