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FAIR VALUE MEASUREMENT - Gain (Loss) Recognized in Statements of Operation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Effect of derivative instruments on consolidated statements of operations
Gain (loss) on change in fair value of derivatives	$ 50,001	$ (22,218)	$ (19,230)
Foreign exchange forward contracts
Effect of derivative instruments on consolidated statements of operations
Gain (loss) on change in fair value of derivatives	49,807	(20,249)	(16,414)
Foreign exchange option contracts
Effect of derivative instruments on consolidated statements of operations
Gain (loss) on change in fair value of derivatives	1,376	(1,022)	(2,023)
Interest rate swap
Effect of derivative instruments on consolidated statements of operations
Gain (loss) on change in fair value of derivatives	$ (1,182)	$ (947)	$ (793)

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No definition available.

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- Definition

Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4CC
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL109998890-113959

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624171-113959

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