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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Nonhedging Designation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Not designated as hedging instruments | Foreign currency exchange contracts | Other income (expense), Net |  |  |
Net (losses) gains on derivative instruments |  |  |
Amount of (loss) gain recognized in income on derivatives | $ 9,737 | $ (13,733) | $ 1,819

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