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Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Retained Earnings |  |  |
Cash dividends, per share (usd per share) | $ 1.24 | $ 1.12 | $ 0.96

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