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Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2013
Investments, All Other Investments [Abstract]  
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, 2013:

 
Carrying
Amount
 
Fair
Value
 
(Dollars in thousands)
Assets:
 
 
 
Cash and cash equivalents
$
113,195

 
$
113,195

 
 
 
 
Liabilities:
 

 
 

Bank debt
$
1,378,234

 
$
1,378,234

5% Senior Notes
500,000

 
497,500

Interest rate swap agreements
8,466

 
8,466

Natural gas swap agreements
316

 
316