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FAIR VALUE MEASUREMENT - Gain (Loss) Recognized in Statements of Operation (Details) - USD ($) $ in Thousands | 12 Months Ended
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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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- 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 + Details
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