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Financial Instruments and Derivative Financial Instruments Foreign Currency Forward Contracts (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Derivative [Line Items]      
Gain (Loss) on Foreign Currency Fair Value Hedge Derivatives $ (2,940) $ (780) $ 1,233