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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) - $ / shares
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement of Stockholders' Equity [Abstract]      
Common stock purchased by directors' deferred compensation plan (in shares) 12,020 22,800 8,159
Cash dividends (in dollars per share) $ 0.70 $ 0.6 $ 0.82
Shares of common stock repurchased (in shares) 864,483 796,822 4,122,881