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Properties and Equipment (Tables)
 12 Months Ended
Dec. 31, 2013
Properties and Equipment  
Components of net properties and equipment

 

 

 
   December 31,  
(In thousands)
  2013   2012  

Proved oil and gas properties

   $ 6,362,570   $ 5,724,940  

Unproved oil and gas properties

     375,428     467,483  

Gathering and pipeline systems

     239,958     239,656  

Land, building and other equipment

     94,243     86,137  
           
​ ​ ​ ​ ​ ​ ​ ​

 

     7,072,199     6,518,216  

Accumulated depreciation, depletion and amortization

     (2,525,972 )   (2,207,239 )
           
​ ​ ​ ​ ​ ​ ​ ​

 

   $ 4,546,227   $ 4,310,977  
           
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​
           
Schedule of net changes in capitalized exploratory well costs

 

 

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

Balance at beginning of period

   $ 10,390   $ 5,328   $ 4,285  

Additions to capitalized exploratory well costs pending the determination of proved reserves

     —     10,390     5,328  

Reclassifications to wells, facilities, and equipment based on the determination of proved reserves

     (10,198 )   —     (1,138 )

Capitalized exploratory well costs charged to expense

     (192 )   (5,328 )   (3,147 )
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Balance at end of period

   $ —   $ 10,390   $ 5,328  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
               
Schedule of aging of capitalized exploratory well costs

 

 

 
   December 31,  
(In thousands)
  2013   2012   2011  

Capitalized exploratory well costs that have been capitalized for a period of one year or less

   $ —   $ 10,390   $ 5,328  

Capitalized exploratory well costs that have been capitalized for a period greater than one year

     —     —     —  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

 

   $ —   $ 10,390   $ 5,328  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​