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Fair Value Measurements and Derivative Instruments (Details 10) (Foreign currency debt, USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Net investment hedge    
Amount of Gain (Loss) Recognized in OCI (Effective) $ 12,732 $ (20,770)
Other income (expense)
   
Net investment hedge    
Amount of Gain (Loss) Recognized in OCI (Effective) $ 12,732 $ (20,770)