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Financial Instruments (Tables)
3 Months Ended
Mar. 31, 2012
Summary of Carrying Amounts and Estimated Fair Values of Other Financial Instruments
The following table summarizes the carrying amounts and estimated fair values of our other financial instruments at March 31, 2012:

   
Carrying
   
Fair
 
   
Amount
   
Value
 
   
(Dollars in thousands)
 
Assets:
           
Cash and cash equivalents
  $ 648,479     $ 648,479  
                 
Liabilities:
               
Bank debt
    1,166,341       1,166,341  
7¼% Notes
    245,454       280,938  
5% Notes
    500,000       498,440  
Interest rate swap agreements
    11,532       11,532  
Natural gas swap agreements
    838       838