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Long Term Debt (Tables)
6 Months Ended
Jun. 30, 2011
Long-Term Debt [Abstract]  
Long-Term Debt
                 
    June 30,     December 31,  
    2011     2010  
    (In thousands)  
5.15% Senior Notes (due 2014)
  $ 249,778     $ 249,745  
4.875% Senior Notes (due 2015)
    249,751       249,724  
5.875% Senior Notes (due 2019)
    499,382       499,351  
5.70% Senior Notes (due 2039)
    496,796       496,773  
     
Total
  $ 1,495,707     $ 1,495,593  
     
Aggregate maturities of long-term debt for each of the five years
         
(Dollars in thousands)  
2012
  $  
2013
     
2014
    249,778  
2015
    249,751  
2016
     
Thereafter
    996,178  
 
     
Total
  $ 1,495,707