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Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Stock Issued During Period, Shares, Acquisitions | 5,593,116 |  |
Cash dividend declared per share | $ 0.17 | $ 0.17 | $ 0.17

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