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Foreign Currency Exchange Risk Management (Details 2) (Euro-denominated debt, Net Investment Hedging Relationship, USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
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) $ 569 $ (329) $ 171 $ (1,621)