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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2011
Income Tax [Abstract]  
Analysis of deferred taxes
                 
    As of December 31,  
    2011     2010  

Tax effect of temporary differences:

               

Oil and gas properties – full cost

  ($ 381,413   ($ 224,624

Asset retirement obligations

    153,281       134,611  

Stock compensation

    4,962       4,932  

Hedges

    (12,882     8,205  

Alternative minimum tax credit carryforward

    5,358       —    

Other

    8,931       4,923  
   

 

 

   

 

 

 
    ($ 221,763   ($ 71,953
   

 

 

   

 

 

 
Summary of statutory federal income tax rate and effective income tax rate as a percentage
                         
    Year Ended December 31,  
    2011     2010     2009  

Income tax expense computed at the statutory federal income tax rate

    35.0     35.0     (35.0 %) 

Domestic production activities deduction

    —         (0.6     —    

State taxes and other

    1.1       2.6       0.2  

Statutory depletion

    (0.1     (0.1     —    
   

 

 

   

 

 

   

 

 

 

Effective income tax rate

    36.0     36.9     (34.8 %) 
   

 

 

   

 

 

   

 

 

 
Total amount of unrecognized tax benefits
         

Total unrecognized tax benefits as of December 31, 2010

  $ 425  

Increases (decreases) in unrecognized tax benefits as a result of:

       

Tax positions taken during a prior period

    —    

Tax positions taken during the current period

    —    

Settlements with taxing authorities

    (40

Lapse of applicable statute of limitations

    —    
   

 

 

 

Total unrecognized tax benefits as of December 31, 2011

  $ 385