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Restructuring Charges - General (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Restructuring charges |  |  |  |  |
Restructuring charges | $ 313 | $ 2,900 |  | $ 1,953 | $ 7,036
Severance costs |  |  |  |  |
Restructuring charges |  |  |  |  |
Restructuring charges | 224 | 1,402 |  | 1,717 | 5,538
Organizational Restructuring |  |  |  |  |
Restructuring charges |  |  |  |  |
Restructuring charges |  | (33) |  |  | 1,695
Estimated additional charges | 0 |  |  | 0 |
Organizational Restructuring | Severance costs |  |  |  |  |
Restructuring charges |  |  |  |  |
Restructuring charges |  | (33) | $ 1,700 |  | 1,695
Pandemic Restructuring |  |  |  |  |
Restructuring charges |  |  |  |  |
Restructuring charges | 224 | 1,435 |  | 1,717 | 3,843
Estimated additional charges | 0 |  |  | 0 |
Pandemic Restructuring | Severance costs |  |  |  |  |
Restructuring charges |  |  |  |  |
Restructuring charges | 224 | 1,435 |  | 1,717 | 3,843
Restructuring charges incurred to date | 7,000 |  |  | 7,000 |
Property Restructuring |  |  |  |  |
Restructuring charges |  |  |  |  |
Restructuring charges | 19 | $ 1,498 |  | 35 | $ 1,498
Restructuring charges incurred to date | 1,500 |  |  | 1,500 |
Facility Exit Plan |  |  |  |  |
Restructuring charges |  |  |  |  |
Estimated additional charges | $ 800 |  |  | $ 800 |

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