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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Nonhedging Designation (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
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)