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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Nonhedging Designation (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Not designated as hedging instruments | Foreign currency exchange contracts | Interest and other income, net |  |  |  |
Net (losses) gains on derivative instruments |  |  |  |
Amount of (loss) gain recognized in income on derivatives | $ 2,175 | $ (2,172) | $ 7,909 | $ (11,639)

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