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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

X

- Definition

Amount of loss from impairment of right-of-use asset from operating lease.

+ References

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-Publisher FASB
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The expected number of positions to be eliminated as a result of restructuring activities.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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