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Restructuring Charges - By segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Restructuring charges |  |  |  |
Restructuring charges | $ 313 | $ 2,900 | $ 1,953 | $ 7,036
Organizational Restructuring |  |  |  |
Restructuring charges |  |  |  |
Restructuring charges |  | (33) |  | 1,695
Pandemic Restructuring |  |  |  |
Restructuring charges |  |  |  |
Restructuring charges | 224 | 1,435 | 1,717 | 3,843
Property Restructuring |  |  |  |
Restructuring charges |  |  |  |
Loss on sale |  | 915 |  | 915
Impairment loss |  | 583 | 9 | 583
Other exit costs |  |  | 26 |
Restructuring charges | 19 | 1,498 | 35 | 1,498
Other Restructuring |  |  |  |
Restructuring charges |  |  |  |
Restructuring charges | 70 |  | 201 |
Corporate |  |  |  |
Restructuring charges |  |  |  |
Restructuring charges | 313 | 1,730 | 1,192 | 3,090
Corporate | Organizational Restructuring |  |  |  |
Restructuring charges |  |  |  |
Restructuring charges |  | (13) |  | 612
Corporate | Pandemic Restructuring |  |  |  |
Restructuring charges |  |  |  |
Restructuring charges | 224 | 245 | 956 | 980
Corporate | Property Restructuring |  |  |  |
Restructuring charges |  |  |  |
Loss on sale |  | 915 |  | 915
Impairment loss |  | 583 | 9 | 583
Other exit costs |  |  | 26 |
Restructuring charges | 19 | 1,498 | 35 | 1,498
Corporate | Other Restructuring |  |  |  |
Restructuring charges |  |  |  |
Restructuring charges | $ 70 |  | 201 |
Contract Operations | Operating |  |  |  |
Restructuring charges |  |  |  |
Restructuring charges |  | 526 | 616 | 2,390
Contract Operations | Operating | Organizational Restructuring |  |  |  |
Restructuring charges |  |  |  |
Restructuring charges |  | (20) |  | 458
Contract Operations | Operating | Pandemic Restructuring |  |  |  |
Restructuring charges |  |  |  |
Restructuring charges |  | 546 | 616 | 1,932
Aftermarket Services | Operating |  |  |  |
Restructuring charges |  |  |  |
Restructuring charges |  | 644 | 145 | 1,556
Aftermarket Services | Operating | Organizational Restructuring |  |  |  |
Restructuring charges |  |  |  |
Restructuring charges |  |  |  | 625
Aftermarket Services | Operating | Pandemic Restructuring |  |  |  |
Restructuring charges |  |  |  |
Restructuring charges |  | $ 644 | $ 145 | $ 931

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