v2.4.0.6
FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)
12 Months Ended
Dec. 31, 2012
FAIR VALUE OF FINANCIAL INSTRUMENTS  
Summary of the carrying values and estimated fair values of fixed-rate long-term debt and natural gas swaps

 

 
  December 31, 2012   December 31, 2011  
 
  Carrying
Amount
  Fair
Value
  Carrying
Amount
  Fair
Value
 

Level 1

                         

Long-term debt:

                         

9.0 percent notes

  $ 448,091   $ 501,750   $ 497,463   $ 525,315  

Level 2

                         

Derivative instruments:

                         

Natural gas forward purchase contracts liability (assets)

    (6 )   (6 )   721     721