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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) - $ / shares
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Statement of Stockholders' Equity [Abstract]    
Cash dividends (in dollars per share) $ 0.40 $ 0.34
Common stock (purchased) sold by directors' deferred compensation plan (in net shares) 16,950 10,620
Shares of common stock repurchased 614,247 362,371