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Long-Term Debt
9 Months Ended
Sep. 30, 2011
Long-Term Debt [Abstract] 
Long-Term Debt
8. Long-Term Debt
     Long-term debt consists of the following:
                 
    September 30,     December 31,  
    2011     2010  
    (In thousands)  
5.15% Senior Notes (due 2014)
  $ 249,795     $ 249,745  
4.875% Senior Notes (due 2015)
    249,765       249,724  
5.875% Senior Notes (due 2019)
    499,398       499,351  
5.70% Senior Notes (due 2039)
    496,807       496,773  
     
Total
  $ 1,495,765     $ 1,495,593  
     
     The aggregate annual maturities of long-term debt are as follows:
         
(Dollars in thousands)  
2012
  $  
2013
     
2014
    249,795  
2015
    249,765  
2016
     
Thereafter
    996,205  
 
     
Total
  $ 1,495,765  
 
     
     On October 12, 2011, we terminated our $285 million syndicated, senior unsecured revolving credit facility.