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RESTRUCTURING AND RELATED CHARGES - Narrative (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 15 Months Ended | 21 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Dec. 31, 2020 numberofemployees | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2021 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and related charges | $ 20,559 | $ (61) |  | $ 61,037 | $ (175) |  |
Restructuring charges related to impairment of right-of-use assets |  |  |  | $ 17,200 |  |  |
Forecast |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and related charges |  |  |  |  |  |  | $ 105,000
Reduction in number of positions (in employees) | numberofemployees |  |  | 1,300 |  |  |  |
Minimum | Forecast |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and related charges |  |  |  |  |  | $ 75,000 |
Maximum | Forecast |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and related charges |  |  |  |  |  | $ 105,000 |

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