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Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Stock issued for acquisition of Filament (in shares) |  | 5,593,116 |
Dividend per share (usd per share) | $ 0.17 | $ 0.17 | $ 0.17

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