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Net Income (Loss) Attributable to Shareholders of Crawford & Company per Common Share - Additional Information (Details) - $ / shares | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | May 09, 2019 | Jul. 29, 2017
Class A Non-Voting |  |  |  |  |  |
Equity, Class of Treasury Stock |  |  |  |  |  |
Shares repurchased (shares) | 0 | 280,079 | 155,351 | 701,506 |  |
Average cost (USD per share) |  | $ 9.07 | $ 8.42 | $ 9.11 |  |
Class B Voting |  |  |  |  |  |
Equity, Class of Treasury Stock |  |  |  |  |  |
Shares repurchased (shares) | 0 | 72,351 | 161,459 | 1,449,240 |  |
Average cost (USD per share) |  | $ 8.81 | $ 8.42 | $ 9.11 |  |
Repurchase Authorization 2017 | Common Stock |  |  |  |  |  |
Equity, Class of Treasury Stock |  |  |  |  |  |
Number of shares authorized to be repurchased (shares) |  |  |  |  |  | 2,000,000
Repurchase Authorization 2019 | Common Stock |  |  |  |  |  |
Equity, Class of Treasury Stock |  |  |  |  |  |
Number of shares authorized to be repurchased (shares) |  |  |  |  | 2,000,000 |
Number of shares remaining to be repurchased (shares) | 642,097 |  | 642,097 |  |  |
Stock Purchase Agreement | Class A Non-Voting |  |  |  |  |  |
Equity, Class of Treasury Stock |  |  |  |  |  |
Shares repurchased (shares) |  |  |  | 421,427 |  |
Stock Purchase Agreement | Class B Voting |  |  |  |  |  |
Equity, Class of Treasury Stock |  |  |  |  |  |
Shares repurchased (shares) |  |  |  | 1,376,889 |  |

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