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Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Shareholders' equity |  |
Common stock, par value |  |
Common stock, shares issued | 59,082,275 | 58,921,731
Common stock, shares outstanding | 59,081,999 | 58,921,008
Number of treasury shares held in trust for future settlement of share based awards | 276 | 723

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