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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) - $ / shares
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Statement of Stockholders' Equity [Abstract]    
Cash dividends (in dollars per share) $ 0.19 $ 0.16
Common stock (purchased) sold by directors' deferred compensation plan (in net shares) 2,850 0
Shares of common stock repurchased 344,362 113,750