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Derivative Financial Instruments (Tables)
3 Months Ended
Mar. 31, 2013
Derivative Financial Instruments  
Components of gain (loss) on derivatives, net

 

 
  Three Months Ended
March 31,
 
 
  2013   2012  
 
  (in thousands)
 

Realized loss on derivative agreements

  $ (52,515 ) $ (19,086 )

Unrealized gain (loss) on derivative agreements

    32,489     (128,167 )
           

Total loss on derivatives, net

  $ (20,026 ) $ (147,253 )
           
Schedule of offsetting assets recorded as non-current assets in other long-term assets in the Condensed Consolidated Balance Sheets

 

 
  As of March 31, 2013  
Description
  Gross
Non-
Current
Assets
  Gross
Amounts
Offset
  Net
Non-
Current
Assets
Presented
  Cash
Collateral
Not Offset
  Net
Amount
 
 
  (in thousands)
 

Commodity Swaps

  $ 1,463   $ (2 ) $ 1,461   $   $ 1,461  
                       

Total

  $ 1,463   $ (2 ) $ 1,461   $   $ 1,461  
                       
 

 
  As of March 31, 2013  
Description
  Gross
Current
Liabilities
  Gross
Amounts
Offset
  Net
Current
Liabilities
Presented
  Cash
Collateral
Not Offset
  Net
Amount
 
 
  (in thousands)
 

Commodity Swaps

  $ 54,588   $ (19,058 ) $ 35,530   $   $ 35,530  

Other Derivative Activity

    251         251     (251 )    
                       

Total

  $ 54,839   $ (19,058 ) $ 35,781   $ (251 ) $ 35,530  
                       
Schedule of offsetting liabilities recorded as current liabilities in other current liabilities in the Condensed Consolidated Balance Sheet

 

 
  As of December 31, 2012  
Description
  Gross
Non-
Current
Assets
  Gross
Amounts
Offset
  Net
Non-
Current
Assets
Presented
  Cash
Collateral
Not Offset
  Net
Amount
 
 
  (in thousands)
 

Commodity Swaps

  $ 945   $ (7 ) $ 938   $   $ 938  
                       

Total

  $ 945   $ (7 ) $ 938   $   $ 938  
                       
 

 
  As of December 31, 2012  
Description
  Gross
Current
Liabilities
  Gross
Amounts
Offset
  Net
Current
Liabilities
Presented
  Cash
Collateral
Not Offset
  Net
Amount
 
 
  (in thousands)
 

Commodity Swaps

  $ 74,178   $ (6,445 ) $ 67,733   $   $ 67,733  

Other Derivative Activity

    21     (7 )   14     (14 )    
                       

Total

  $ 74,199   $ (6,452 ) $ 67,747   $ (14 ) $ 67,733