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Fair Value Measurements (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) (USD $)
In Thousands
Sep. 30, 2011
Dec. 31, 2010
Treasury locks, Carrying Value $ 872
Treasury locks, Fair Value 872
Treasury locks, Fair Value(41,700) 
Fair Value, Inputs, Level 1 [Member]
  
Money market funds, Carrying Value39,617[1]196,058[1]
Money market funds, Fair Value39,617[1]196,058[1]
Fair Value, Inputs, Level 2 [Member]
  
Foreign currency exchange contracts, Carrying Value 12[1]
Foreign currency exchange contracts, Fair Value 12[1]
Treasury locks, Carrying Value(41,669)[1] 
Treasury locks, Fair Value$ (41,669)[1] 
[1]Market approach — prices and other relevant information generated by market transactions involving identical or comparable assets or liabilities