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Accumulated Other Comprehensive Income / (Loss) (Tables)
 12 Months Ended
Dec. 31, 2013
Accumulated Other Comprehensive Income / (Loss)  
Changes in accumulated other comprehensive income / (loss) by component, net of tax

 

 

(In thousands)
  Net Gains /
(Losses) on
Cash Flow
Hedges		   Defined Benefit
Pension and
Postretirement
Benefits		   Foreign
Currency
Translation
Adjustment		   Total  

Balance at December 31, 2010

   $ 10,494   $ (14,122 ) $ (55 ) $ (3,683 )
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   

Other comprehensive income before reclassifications

     163,704     (13,814 )   —     149,890  

Amounts reclassified from accumulated other
comprehensive income

     (52,840 )   11,125     55     (41,660 )
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Net current-period other comprehensive income

     110,864     (2,689 )   55     108,230  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Balance at December 31, 2011

   $ 121,358   $ (16,811 ) $ —   $ 104,547  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   

Other comprehensive income before reclassifications

     53,815     1,258     —     55,073  

Amounts reclassified from accumulated other
comprehensive income

     (144,456 )   8,716     —     (135,740 )
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Net current-period other comprehensive income

     (90,641 )   9,974     —     (80,667 )
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Balance at December 31, 2012

   $ 30,717   $ (6,837 ) $ —   $ 23,880  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   

Other comprehensive income before reclassifications

     (2,720 )   4,641     —     1,921  

Amounts reclassified from accumulated other
comprehensive income

     (34,548 )   386     —     (34,162 )
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Net current-period other comprehensive income

     (37,268 )   5,027     —     (32,241 )
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Balance at December 31, 2013

   $ (6,551 ) $ (1,810 ) $ —   $ (8,361 )
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   
Schedule of amount reclassified from accumulated other comprehensive income / (loss) into the Condensed Consolidated Statement of Operations

 

 

 
   Year Ended December 31,    
 
   Affected Line Item in the Condensed
Consolidated Statement of Operations
(In thousands)
  2013   2012   2011

Net Gains / (Losses) on Cash Flow Hedges

                      

Commodity contracts

   $ 52,733   $ 225,108   $ 84,937   Natural gas revenues

Commodity contracts

     4,269     11,218     1,403   Crude oil and condensate revenues

Defined Benefit Pension and Postretirement Benefits

    
 		    
 		    
 		  

 

Settlement

     —     —     (5,523 ) General and administrative expense

Amortization of net obligation at transition

     —     —     (632 ) General and administrative expense

Amortization of prior service cost

     —     (221 )   (1,046 ) General and administrative expense

Amortization of net loss

     (641 )   (13,906 )   (10,975 ) General and administrative expense

Foreign currency translation adjustment

     —     —     (89 )  
                 
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

 

     56,361     222,199     68,075   Total before tax

 

     (22,199 )   (86,459 )   (26,415 ) Tax (expense) / benefit
                 
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total reclassifications for the period

   $ 34,162   $ 135,740   $ 41,660   Net of tax
                 
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​