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Foreign Currency Exchange Risk Management (Details) (Euro-denominated debt, Net Investment Hedging Relationship, USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Euro-denominated debt | Net Investment Hedging Relationship
 
Non-derivative instrument qualifying and designated as a hedging instrument in net foreign investment hedges on the consolidated financial statements  
Amount of Gain (Loss) Recognized in AOCI (Effective Portion) $ (398)