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Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2014
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:
 
 
2014
 
2013
 
Carrying
Amount
 
Fair
Value
 
Carrying
Amount
 
Fair
Value
 
(Dollars in thousands)
Assets:
 
 
 
 
 
 
 
Cash and cash equivalents
$
222,591

 
$
222,591

 
$
160,463

 
$
160,463

Liabilities:
 
 
 
 
 
 
 
Bank debt
$
798,963

 
$
798,963

 
$
903,836

 
$
903,836

5½% Notes
300,000

 
307,500

 
300,000

 
298,125

5% Notes
500,000

 
500,715

 
500,000

 
495,625

Interest rate swap agreements
1,196

 
1,196

 
6,895

 
6,895

Natural gas swap agreements
746

 
746

 
22

 
22