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Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares | 6 Months Ended
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Jun. 30, 2017 | Jun. 30, 2016
Statement of Stockholders' Equity [Abstract] |  |
Dividend, per share | $ 0.40 | $ 0.38
Excise of stock option, shares | 2,968 | 89,633

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