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Financial Derivatives and Hedging Activities (Details 2) (Forward foreign currency exchange contracts [Member], USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Prepaid Expenses and Other Current Assets [Member] | Designated as hedging [Member] |  |
Fair values of derivative instruments |  |
Derivative asset, fair value | $ 293 | $ 107
Prepaid Expenses and Other Current Assets [Member] | Not designated as hedging [Member] |  |
Fair values of derivative instruments |  |
Derivative asset, fair value | 50 | 159
Other Current Liabilities [Member] | Designated as hedging [Member] |  |
Fair values of derivative instruments |  |
Derivative liability, fair value | 230 | 751
Other Current Liabilities [Member] | Not designated as hedging [Member] |  |
Fair values of derivative instruments |  |
Derivative liability, fair value | $ 18 | $ 16

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