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Net Income (Loss) 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 (Loss) per Share (Details) - Class A Non-Voting - shares shares in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
CRD-A Issued under Non-Employee Director Stock Plan |  |  |  |
Share-based Compensation Arrangement |  |  |  |
Stock issued during period | 4 | 9 | 67 | 85
CRD-A Issued under the U.K. ShareSave Scheme |  |  |  |
Share-based Compensation Arrangement |  |  |  |
Stock issued during period |  | 257 | 1 | 266
CRD-A Issued under 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 |  | 59 |  | 59

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