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Restructuring Charges - By segment (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Restructuring charges |  |
Restructuring charges | $ 897 | $ 1,728
Severance costs |  |
Restructuring charges |  |
Restructuring charges | 888 | 1,728
Organizational Restructuring |  |
Restructuring charges |  |
Restructuring charges |  | 1,728
Estimated additional charges | 0 |
Organizational Restructuring | Severance costs |  |
Restructuring charges |  |
Restructuring charges |  | 1,728
Pandemic Restructuring |  |
Restructuring charges |  |
Restructuring charges | 888 |
Pandemic Restructuring | Severance costs |  |
Restructuring charges |  |
Restructuring charges | 888 |
Restructuring charges incurred to date | 6,100 |
Property Restructuring |  |
Restructuring charges |  |
Restructuring charges | 9 |
Restructuring charges incurred to date | 1,500 |
Property Restructuring | Impairment |  |
Restructuring charges |  |
Restructuring charges | 9 |
Corporate |  |
Restructuring charges |  |
Restructuring charges | 594 |
Corporate | Organizational Restructuring |  |
Restructuring charges |  |
Restructuring charges |  | 625
Corporate | Pandemic Restructuring |  |
Restructuring charges |  |
Restructuring charges | 585 |
Corporate | Property Restructuring |  |
Restructuring charges |  |
Restructuring charges | 9 |
Contract Operations | Operating Segments |  |
Restructuring charges |  |
Restructuring charges | 279 |
Contract Operations | Operating Segments | Organizational Restructuring |  |
Restructuring charges |  |
Restructuring charges |  | 478
Contract Operations | Operating Segments | Pandemic Restructuring |  |
Restructuring charges |  |
Restructuring charges | 279 |
Aftermarket Services | Operating Segments |  |
Restructuring charges |  |
Restructuring charges | 24 |
Aftermarket Services | Operating Segments | Organizational Restructuring |  |
Restructuring charges |  |
Restructuring charges |  | $ 625
Aftermarket Services | Operating Segments | Pandemic Restructuring |  |
Restructuring charges |  |
Restructuring charges | $ 24 |

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