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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement of Stockholders' Equity [Abstract]      
Common stock purchased by directors' deferred compensation plan (in shares) 16,950 12,020 22,800
Cash dividends (in dollars per share) $ 0.82 $ 0.7 $ 0.6
Shares of common stock repurchased (in shares) 1,155,157 864,483 796,822