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Derivative Instruments (Tables)
3 Months Ended
Mar. 31, 2012
Derivatives, Fair Value [Line Items]  
Schedule Of Outstanding Commodity Derivative Instruments

Settlement Period

  

Derivative
Instrument

   Total
Notional
Amount of
Oil (Barrels)
     Average
Sub-Floor
Price
     Average
Floor Price
     Average
Ceiling Price
     Fair Value
Asset
(Liability)
 
                                      (In thousands)  
2012    Two-Way Collars      1,237,500          $ 85.56       $ 106.50       $ (5,427
2012    Three-Way Collars      2,872,000       $ 66.62       $ 90.45       $ 109.14         (7,471
2013    Two-Way Collars      807,500          $ 89.23       $ 111.69         (1,646
2013    Three-Way Collars      2,404,500       $ 69.33       $ 91.61       $ 113.25         (7,338
2014    Two-Way Collars      62,000          $ 90.00       $ 112.78         1   
2014    Three-Way Collars      186,000       $ 70.00       $ 91.67       $ 113.58         (464
                 

 

 

 
                  $ (22,345
                 

 

 

 
Schedule Of Location And Fair Value Of Outstanding Commodity Derivative Instruments

Fair Value of Derivative Instrument Assets (Liabilities)

 
          Fair Value  

Instrument Type

  

Balance Sheet Location

   March 31,
2012
    December 31,
2011
 
          (In thousands)  

Crude oil collar

   Other current assets — current assets    $ 72      $ —     

Crude oil collar

   Derivative instruments — non-current assets      486        4,362   

Crude oil collar

   Derivative instruments — current liabilities      (16,469     (5,907

Crude oil collar

   Derivative instruments — non-current liabilities      (6,434     (3,505
     

 

 

   

 

 

 

Total derivative instruments

      $ (22,345   $ (5,050
     

 

 

   

 

 

 
Commodity Derivative Instruments [Member]
 
Derivatives, Fair Value [Line Items]  
Realized And Unrealized Gains And Losses From Commodity Derivative Instruments
          Three Months Ended March 31,  
    

Income Statement Location

       2012             2011      
          (In thousands)  

Change in unrealized loss on derivative instruments

   Net loss on derivative instruments    $ (17,295   $ (31,154

Realized loss on derivative instruments

   Net loss on derivative instruments      (1,291     (512
     

 

 

   

 

 

 

Total net loss on derivative instruments

      $ (18,586   $ (31,666