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RESTRUCTURING AND RELATED CHARGES - Schedule of Restructuring Costs by Segment (Details) $ in Thousands | 12 Months Ended | 21 Months Ended
--- | --- | ---
Dec. 31, 2020 USD ($) employee | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2021 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |
Employee benefit and severance costs | $ 38,001 |  |  |
Legal and advisory costs | 2,137 |  |  |
Property, equipment and software impairments | 5,613 |  |  |
Right-of-use asset impairments and lease-related charges (credits) | 19,085 |  |  |
Total restructuring charges (credits) | $ 64,836 | $ 31 | $ (136) |
Number of positions eliminated | employee | 1,200 |  |  |
Long-lived asset impairment | $ 22,351 | $ 0 | $ 0 |
Property, Equipment and Software Impairments |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Long-lived asset impairment | 5,600 |  |  |
Right-of-Use Asset Impairments and Lease-Related Charges |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Long-lived asset impairment | 16,000 |  |  |
North America |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Employee benefit and severance costs | 17,322 |  |  |
Legal and advisory costs | 1,308 |  |  |
Property, equipment and software impairments | 5,322 |  |  |
Right-of-use asset impairments and lease-related charges (credits) | 13,775 |  |  |
Total restructuring charges (credits) | 37,727 |  |  |
Long-lived asset impairment | 18,100 |  |  |
International |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Employee benefit and severance costs | 20,679 |  |  |
Legal and advisory costs | 829 |  |  |
Property, equipment and software impairments | 291 |  |  |
Right-of-use asset impairments and lease-related charges (credits) | 5,310 |  |  |
Total restructuring charges (credits) | 27,109 |  |  |
Long-lived asset impairment | $ 3,500 |  |  |
Forecast |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total restructuring charges (credits) |  |  |  | $ 105,000

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