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Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2016
Fair Value Disclosures [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 December 31:
 
 
2016
 
2015
 
Carrying
Amount
 
Fair
Value
 
Carrying
Amount
 
Fair
Value
 
(Dollars in thousands)
Assets:
 
 
 
 
 
 
 
Cash and cash equivalents
$
24,690

 
$
24,690

 
$
99,945

 
$
99,945

Natural gas swap agreements
1,094

 
1,094

 

 

Liabilities:
 
 
 
 
 
 
 
Bank debt
$
771,192

 
$
771,192

 
$
725,818

 
$
725,818

5½% Notes
300,000

 
312,750

 
300,000

 
309,189

5% Notes
500,000

 
510,130

 
500,000

 
510,055

Interest rate swap agreements
244

 
244

 
771

 
771

Natural gas swap agreements

 

 
813

 
813