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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES: (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Derivative contracts |  |
Assets | $ 189 |
Liabilities | (301) |
Derivatives designated as hedging instruments: |  |
Derivative contracts |  |
Assets | 127 | 546
Liabilities | (301) | (138)
Derivatives designated as hedging instruments: | Foreign currency forward contracts |  |
Derivative contracts |  |
Notional Amounts |  | 13,044
Assets |  | 205
Derivatives designated as hedging instruments: | Commodity futures contracts, net |  |
Derivative contracts |  |
Notional Amounts | 7,868 | 4,557
Assets | 127 | 341
Liabilities | (301) | (138)
Derivatives not designated as hedging instruments: |  |
Derivative contracts |  |
Assets | 62 |
Derivatives not designated as hedging instruments: | Commodity futures contracts, net |  |
Derivative contracts |  |
Notional Amounts | 627 |
Assets | $ 62 |

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