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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) - $ / shares | 12 Months Ended
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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

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