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Derivative Instruments and Hedging Activities (Tables)
 12 Months Ended
Dec. 31, 2013
Derivative Instruments and Hedging Activities  
Outstanding commodity derivatives designated as hedging instruments

 

 

 
    
    
   Collars   Swaps  
 
    
    
   Floor   Ceiling    
  
Type of Contract
  Volume   Contract Period   Range   Weighted-
Average		   Range   Weighted-
Average		   Weighted-
Average		  

Natural gas

     336.8Bcf   Jan. 2014 - Dec. 2014   $3.60 - $4.37   $ 4.13   $4.22 - $4.80   $ 4.51        

Natural gas

     35.5Bcf   Jan. 2014 - Dec. 2014                       $ 4.12  
Effect of Derivative Instruments on the Consolidated Balance Sheet

 

 

 
    
   Fair Values of Derivative Instruments  
 
    
   Derivative Assets   Derivative Liabilities  
 
    
   December 31,   December 31,  
 
   Balance Sheet Location  
(In thousands)
  2013   2012   2013   2012  

Commodity contracts

   Derivative instruments (current assets)   $ 3,019   $ 50,824   $ —   $ —  

Commodity contracts

   Derivative instruments (current liabilites)     —     —     13,912     192  
                       
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

 

       $ 3,019   $ 50,824   $ 13,912   $ 192  
                       
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                       
Schedule of offsetting of derivative assets and liabilities in the condensed consolidated balance sheet

 

 

 
   Year Ended
December 31,		  
(In thousands)
  2013   2012  

Derivative Assets

              

Gross amounts of recognized assets

   $ 13,792   $ 54,454  

Gross amounts offset in the statement of financial position

     (10,773 )   (3,630 )
           
​ ​ ​ ​ ​ ​ ​ ​

Net amounts of assets presented in the statement of financial position

     3,019     50,824  

Gross amounts of financial instruments not offset in the statement of financial position

     373     1,892  
           
​ ​ ​ ​ ​ ​ ​ ​

Net amount

   $ 3,392   $ 52,716  
           
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​
           

Derivative Liabilities

              

Gross amounts of recognized liabilities

   $ 24,685   $ 3,822  

Gross amounts offset in the statement of financial position

     (10,773 )   (3,630 )
           
​ ​ ​ ​ ​ ​ ​ ​

Net amounts of liabilities presented in the statement of financial position

     13,912     192  

Gross amounts of financial instruments not offset in the statement of financial position

     —     —  
           
​ ​ ​ ​ ​ ​ ​ ​

Net amount

   $ 13,912   $ 192  
           
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​
           
Effect of Derivatives Designated as Hedging Instruments on the Consolidated Statement of Operations

 

 

 
   Amount of Gain (Loss) Recognized
in OCI on Derivative
(Effective Portion)		  
 
   Year Ended December 31,  
(In thousands)
  2013   2012   2011  

Commodity contracts

   $ (4,523 ) $ 88,705   $ 267,667  


 

 
   Amount of Gain (Loss) Reclassified
from Accumulated OCI into
Income (Effective Portion)		  
 
   Year Ended December 31,  
Location of Gain (Loss) Reclassified
from Accumulated OCI into Income
(In thousands)
 
  2013   2012   2011  

Natural gas revenues

   $ 52,733   $ 225,108   $ 84,937  

Crude oil and condensate revenues

     4,269     11,218     1,403  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

 

   $ 57,002   $ 236,326   $ 86,340  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
               
Effect of Derivatives Not Designated as Hedging Instruments on the Consolidated Statement of Operations

 

 

 
    
   Year Ended
December 31,		  
 
   Location of Gain (Loss)
Recognized in Income on
Derivative		  
(In thousands)
  2013   2012   2011  

Commodity contracts

   Natural gas revenues   $ —   $ (494 ) $ (965 )