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Derivative Instruments And Hedging Activities (Impact Of Non Designated Derivative Instruments On Income Statement) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Gain (Loss) Recognized in Income on Derivatives $ (5,113) $ 249 $ (1,472)
Foreign Exchange Contracts [Member] | Other Expense [Member]
     
Gain (Loss) Recognized in Income on Derivatives 411 249 (2,560)
Oil And Natural Gas Commodity Contracts [Member] | Non Hedge Loss On Commodity Derivative Contracts [Member]
     
Gain (Loss) Recognized in Income on Derivatives (10,507)    
Oil And Natural Gas Commodity Contracts [Member] | Income From Discontinued Operations Net Of Tax [Member]
     
Gain (Loss) Recognized in Income on Derivatives 5,550   1,088
Interest Rate Swaps [Member] | Other Expense [Member]
     
Gain (Loss) Recognized in Income on Derivatives $ (567)