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Financial Derivatives and Hedging Activities (Details 2) (Forward foreign currency exchange contracts [Member], USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Prepaid and Other Current Assets [Member] | Designated as hedging [Member] |  |
Fair values of derivative instruments |  |
Derivative asset, fair value | $ 107 | $ 1,520
Prepaid and Other Current Assets [Member] | Not designated as hedging [Member] |  |
Fair values of derivative instruments |  |
Derivative asset, fair value | 159 | 338
Other current liabilities [Member] | Designated as hedging [Member] |  |
Fair values of derivative instruments |  |
Derivative liability, fair value | 751 |
Other current liabilities [Member] | Not designated as hedging [Member] |  |
Fair values of derivative instruments |  |
Derivative liability, fair value | $ 16 | $ 15

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