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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
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
CRD-A Issued under the Non-Employee Director Stock Plan |  |  |  |
Share-based Compensation Arrangement |  |  |  |
Stock issued during period | 3 | 2 | 70 | 87
CRD-A Issued under the U.K. ShareSave Scheme |  |  |  |
Share-based Compensation Arrangement |  |  |  |
Stock issued during period | 1 | 14 | 2 | 280
CRD-A Issued under the Executive Stock Bonus Plan |  |  |  |
Share-based Compensation Arrangement |  |  |  |
Stock issued during period |  |  |  | 30
2016 Omnibus Stock and Incentive Plan |  |  |  |
Share-based Compensation Arrangement |  |  |  |
Stock issued during period |  | 3 |  | 62
CRD-A Issued under the Employee Stock Purchase Plan |  |  |  |
Share-based Compensation Arrangement |  |  |  |
Stock issued during period | 114 | 131 | 114 | 131
CRD-A Issued under the International Plan |  |  |  |
Share-based Compensation Arrangement |  |  |  |
Stock issued during period | 4 | 4 | 4 | 4

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