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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Nonhedging Designation (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Derivatives not designated as hedging instruments | Foreign currency exchange contracts | Interest and other income, net |  |  |  |
Net gains (losses) on derivative instruments |  |  |  |
Amount of gain (loss) recognized in income on derivatives | $ 141 | $ (63) | $ 458 | $ (1,919)

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