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Financial Instruments (Tables)
6 Months Ended
Jun. 30, 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 June 30, 2012:

   
Carrying
   
Fair
 
   
Amount
   
Value
 
   
(Dollars in thousands)
 
Assets:
           
Cash and cash equivalents
  $ 368,882     $ 368,882  
                 
Liabilities:
               
Bank debt
    1,281,529       1,281,529  
5% Notes
    500,000       512,190  
Interest rate swap agreements
    12,530       12,530  
Natural gas swap agreements
    244       244