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Derivative Instruments and Hedging Activities (Details) (USD $) In Thousands, unless otherwise specified | Jun. 29, 2013 | Dec. 31, 2012 | Jun. 30, 2012
--- | --- | --- | ---
Derivative contracts |  |  |
Assets | $ 25 | $ 189 | $ 141
Liabilities | (1,007) | (301) | (221)
Derivatives designated as hedging instruments: |  |  |
Derivative contracts |  |  |
Assets |  | 127 | 127
Liabilities | (1,005) | (301) | (188)
Derivatives designated as hedging instruments: | Foreign currency forward contracts |  |  |
Derivative contracts |  |  |
Notional Amounts | 23,383 |  | 4,350
Assets |  |  | 70
Liabilities | (759) |  |
Derivatives designated as hedging instruments: | Commodity futures contracts, net |  |  |
Derivative contracts |  |  |
Notional Amounts | 1,600 | 7,868 | 3,738
Assets |  | 127 | 56
Liabilities | (246) | (301) | (188)
Derivatives designated as hedging instruments: | Commodity option contracts |  |  |
Derivative contracts |  |  |
Notional Amounts |  |  | 171
Assets |  |  | 1
Derivatives not designated as hedging instruments: |  |  |
Derivative contracts |  |  |
Assets | 25 | 62 | 14
Liabilities | (2) |  | (33)
Derivatives not designated as hedging instruments: | Commodity futures contracts, net |  |  |
Derivative contracts |  |  |
Notional Amounts | 1,272 | 627 | 1,290
Assets | 25 | 62 | 14
Liabilities | $ (2) |  | $ (33)

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