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Consolidated Statements of Stockholders' Equity (Unaudited) (Parenthetical) - $ / shares | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017
Statement of Stockholders' Equity [Abstract] |  |
Dividend, per share | $ 0.60 | $ 0.57
Excise of stock option, shares | 70,587 | 2,968

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