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Net Income Attributable to Shareholders of Crawford & Company per Common Share - Schedule of Shares Issued and Included in Weighted-average Common Shares used to Compute Basic and Diluted Earnings per Share (Details) - Class A Non-Voting - shares shares in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
CRD-A Issued under the Non-Employee Director Stock Plan |  |  |  |
Share-based Compensation Arrangement |  |  |  |
Shares issued repurchased activity | (0) | 3 | 67 | 70
CRD-A Issued under the U.K. ShareSave Scheme |  |  |  |
Share-based Compensation Arrangement |  |  |  |
Shares issued repurchased activity | 5 | 1 | 70 | 2
Employee Stock Purchase Plan |  |  |  |
Share-based Compensation Arrangement |  |  |  |
Shares issued repurchased activity | 159 | 114 | 159 | 114
International Plan |  |  |  |
Share-based Compensation Arrangement |  |  |  |
Shares issued repurchased activity |  | 4 |  | 4

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