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Long-Term Debt (Tables)
6 Months Ended
Jun. 30, 2011
Long-Term Debt [Abstract]  
Carrying values of the senior notes
                 
    June 30, 2011     December 31, 2010  
2.450% senior notes due 2015
  $ 511,309     $ 499,301  
3.950% senior notes due 2020
    498,800       498,749  
5.700% senior notes due 2040
    249,537       249,534  
 
           
Total long-term debt
  $ 1,259,646     $ 1,247,584