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Net Income (Loss) Per Share Attributable To Common Stockholders (Tables)
 12 Months Ended
Dec. 31, 2011
Net Income (Loss) Per Share Attributable To Common Stockholders [Abstract]  
Reconciliation Of Earnings Attributable To Common Stockholders, Basic And Diluted
   Year Ended December 31, 2011  
     Continuing
Operations		     Discontinued
Operations		     Total  
     (in thousands)  

Net income (loss) attributable to common stockholders

    $ 411,337     $ 423,152     $ 834,489  

Participating basic earnings (a)

      (7,482 )      (7,696 )      (15,178 ) 
  

 

 

    

 

 

    

 

 

  

Basic income attributable to common stockholders

      403,855       415,456       819,311  

Reallocation of participating earnings (a)

      190       195       385  
  

 

 

    

 

 

    

 

 

  

Diluted income attributable to common stockholders

    $ 404,045     $ 415,651     $ 819,696  
  

 

 

    

 

 

    

 

 

  

 

     Year Ended December 31, 2010  
     Continuing
Operations		     Discontinued
Operations		     Total  
     (in thousands)  

Net income (loss) attributable to common stockholders

    $ 471,158     $ 134,050     $ 605,208  

Participating basic earnings (a)

      (10,818 )      (3,078 )      (13,896 ) 
  

 

 

    

 

 

    

 

 

  

Basic income attributable to common stockholders

      460,340       130,972       591,312  

Reallocation of participating earnings (a)

      140       40       180  
  

 

 

    

 

 

    

 

 

  

Diluted income attributable to common stockholders

    $ 460,480     $ 131,012     $ 591,492  
  

 

 

    

 

 

    

 

 

  

 

     Year Ended December 31, 2009  
     Continuing
Operations		     Discontinued
Operations		      Total  
     (in thousands)  

Net income (loss) attributable to common stockholders

    $ (151,822 )    $ 99,716      $ (52,106 ) 

Participating basic earnings (a)

      (571 )      375        (196 ) 
  

 

 

    

 

 

     

 

 

  

Basic net income (loss) attributable to common stockholders

      (152,393 )      100,091        (52,302 ) 

Reallocation of participating earnings (a)

      —          —           —     
  

 

 

    

 

 

     

 

 

  

Diluted income (loss) attributable to common stockholders

    $ (152,393 )    $ 100,091      $ (52,302 ) 
  

 

 

    

 

 

     

 

 

  

(a)

Unvested restricted stock awards and Pioneer Southwest phantom unit awards represent participating securities because they participate in nonforfeitable dividends or distributions with the common equity owners of the Company or Pioneer Southwest, as applicable. Participating share- and unit-based earnings represent the distributed and undistributed earnings of the Company attributable to the participating securities. Unvested restricted stock awards and phantom unit awards do not participate in undistributed net losses as they are not contractually obligated to do so.
Reconciliation Of Basic To Diluted Weighted Average Common Shares Outstanding
     Year Ended December 31,  
     2011      2010      2009  
     (in thousands)  

Weighted average common shares outstanding:

         

Basic

      116,904        115,062        114,176  

Dilutive common stock options (a)

      190        212        —     

Contingently issuable—performance shares (a)

      424        646        —     

Convertible notes dilution (b)

      1,697        410        —     
  

 

 

     

 

 

     

 

 

  

Diluted

      119,215        116,330        114,176  
  

 

 

     

 

 

     

 

 

  

(a)

Diluted earnings per share were calculated using the two-class method for the years ended December 31, 2011, 2010 and 2009. The following common stock equivalents were excluded from the diluted loss per share calculations for the year ended 2009 because they would have been anti-dilutive to the calculations: 173,915 outstanding options to purchase the Company's common stock and 223,969 performance shares.

(b)

During January 2008, the Company issued $500 million of 2.875% Convertible Senior Notes. Weighted average common shares outstanding have been increased to reflect the dilutive effect that would have resulted if the 2.875% Convertible Senior Notes had qualified for and been converted during the years ended December 31, 2011 and 2010, respectively. The 2.875% Convertible Senior Notes were not dilutive to the per share calculations of 2009.