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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES: (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Derivative contracts |  |
Assets | $ 484 | $ 23
Liabilities | (2,839) | (2,699)
Derivatives designated as hedging instruments: | Foreign currency forward contracts |  |
Derivative contracts |  |
Notional Amounts | 15,668 | 27,603
Liabilities | (2,626) | (1,939)
Derivatives designated as hedging instruments: | Commodity futures contracts |  |
Derivative contracts |  |
Notional Amounts | 13,202 | 5,422
Assets | 484 | 23
Liabilities | $ (213) | $ (760)

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