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RESTRUCTURING AND RELATED CHARGES - Schedule of Restructuring Liability Activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	$ 699	$ 1,119
Charges payable in cash	38,403	31
Cash payments	(26,617)	(436)
Foreign currency translation	1,646	(15)
Restructuring reserve, ending balance	14,131	699	$ 1,119
Stock-based compensation	39,010	81,615	64,821
Employee Severance and Benefit Costs
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	699	1,119
Charges payable in cash	36,266	31
Cash payments	(25,328)	(436)
Foreign currency translation	1,660	(15)
Restructuring reserve, ending balance	13,297	699	1,119
Stock-based compensation	1,700
Other Exit Costs
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	0	0
Charges payable in cash	2,137	0
Cash payments	(1,289)	0
Foreign currency translation	(14)	0
Restructuring reserve, ending balance	$ 834	$ 0	$ 0

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- Definition

Restructuring Charges, Payable In Cash

+ References

No definition available.

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- Definition

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 17
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3367-108585

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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

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-Publisher FASB
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-Topic 420
-SubTopic 10
-Section S99
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- Definition

Amount of foreign currency translation gain (loss) which decreases (increases) the restructuring reserve.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
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-Section 50
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Amount of noncash expense for share-based payment arrangement.

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