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Fair Value Measurements and Derivative Instruments (Details 11) (Foreign currency debt, USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Net investment hedge    
Amount of Gain (Loss) Recognized in OCI (Effective Portion) $ (11,065) $ 13,241
Other income (expense)
   
Net investment hedge    
Amount of Gain (Loss) Recognized in OCI (Effective Portion) $ (11,065) $ 13,241