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Consolidated Statements of Stockholders' Equity (Unaudited) (Parenthetical) - $ / shares | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Statement of Stockholders' Equity [Abstract] |  |  |  |
Dividends per share | $ 0.20 | $ 0.19 | $ 0.40 | $ 0.38
Excise of stock option, shares |  | 29,863 |  | 66,287

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