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Shareholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2021
Equity [Abstract] |
Summary of details activity in our common stock | The following table details activity in our common stock:
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2021 |  | 2020 |  | 2021 |  | 2020
|  | Shares |  | Amount |  | Shares |  | Amount |  | Shares |  | Amount |  | Shares |  | Amount
Purchases of treasury shares |  | — |  |  | $ | — |  |  | — |  |  | $ | (2) |  |  | (32) |  |  | $ | (12,975) |  |  | (59) |  |  | $ | (15,484) |
Stock option exercises |  | 103 |  |  | 17,045 |  |  | 72 |  |  | 8,395 |  |  | 313 |  |  | 46,433 |  |  | 989 |  |  | 100,732 |
Employee stock plan purchases |  | 9 |  |  | 3,557 |  |  | 11 |  |  | 3,032 |  |  | 26 |  |  | 9,757 |  |  | 31 |  |  | 8,209 |
Restricted stock units vested, net of withheld shares upon award settlement |  | 5 |  |  | $ | (1,451) |  |  | 2 |  |  | $ | (316) |  |  | 104 |  |  | $ | (17,461) |  |  | 45 |  |  | $ | (7,208) |

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- Definition Tabular disclosure of changes in the separate accounts comprising stockholders' equity (in addition to retained earnings) and of the changes in the number of shares of equity securities during at least the most recent annual fiscal period and any subsequent interim period presented is required to make the financial statements sufficiently informative if both financial position and results of operations are presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21463-112644 + Details
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