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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2013
Fair Value Measurements  
Financial assets and liabilities measured at fair value on a recurring basis

 

 

(In thousands)
  Quoted Prices in
Active Markets for
Identical Assets
(Level 1)		   Significant Other
Observable Inputs
(Level 2)		   Significant
Unobservable
Inputs
(Level 3)		   Balance as of
December 31,
2013		  

Assets

                          

Deferred compensation plan

   $ 12,507   $ —   $ —   $ 12,507  

Derivative contracts

     —     —     13,792     13,792  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total assets

   $ 12,507   $ —   $ 13,792   $ 26,299  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   

Liabilities

                          

Deferred compensation plan

   $ 33,211   $ —   $ —   $ 33,211  

Derivative contracts

     —     6,983     17,702     24,685  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total liabilities

   $ 33,211   $ 6,983   $ 17,702   $ 57,896  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   


 

(In thousands)
  Quoted Prices in
Active Markets for
Identical Assets
(Level 1)		   Significant Other
Observable Inputs
(Level 2)		   Significant
Unobservable
Inputs
(Level 3)		   Balance as of
December 31,
2012		  

Assets

                          

Deferred compensation plan

   $ 10,608   $ —   $ —   $ 10,608  

Derivative contracts

     —     9,473     44,981     54,454  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total assets

   $ 10,608   $ 9,473   $ 44,981   $ 65,062  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   

Liabilities

                          

Deferred compensation plan

   $ 23,893   $ —   $ —   $ 23,893  

Derivative contracts

     —     —     3,822     3,822  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total liabilities

   $ 23,893   $ —   $ 3,822   $ 27,715  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   
Fair Value of Financial Assets and Liabilities Classified as Level 3

 

 

 
   Year Ended December 31,  
(In thousands)
  2013   2012   2011  

Balance at beginning of period

   $ 41,159   $ 195,127   $ 14,746  

Total gains or (losses) (realized or unrealized):

                    

Included in earnings(1)

     52,733     224,614     85,375  

Included in other comprehensive income

     (37,249 )   (157,478 )   181,346  

Settlements

     (52,733 )   (221,489 )   (86,340 )

Transfers in and/or out of level 3

     —     385     —  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Balance at end of period

   $ 3,910   $ 41,159   $ 195,127  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
               
(1)
A loss of $0.5 million and $1.0 million for the years ended December 31, 2012 and 2011, respectively, was unrealized and included in natural gas revenues in the Consolidated Statement of Operations.
Carrying amounts and fair values of long-term debt

 

 

 
   December 31, 2013   December 31, 2012  
(In thousands)
  Carrying
Amount		   Estimated
Fair Value		   Carrying
Amount		   Estimated
Fair Value		  

Long-term debt

   $ 1,147,000   $ 1,224,273   $ 1,087,000   $ 1,213,474  

Current maturities

     —     —     (75,000 )   (77,175 )
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Long-term debt, excluding current maturities

   $ 1,147,000   $ 1,224,273   $ 1,012,000   $ 1,136,299  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​