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Earnings Per Common Share Attributable To Avista Corporation (Tables)
 12 Months Ended
Dec. 31, 2011
Earnings Per Common Share Attributable To Avista Corporation [Abstract]  
Computations Of Earnings Per Share

 

     2011     2010     2009  

Numerator:

       

Net income attributable to Avista Corporation

    $ 100,224      $ 92,425      $ 87,071   

Subsidiary earnings adjustment for dilutive securities

      (473 )      (226 )      (114 ) 
  

 

 

    

 

 

    

 

 

  

Adjusted net income attributable to Avista Corporation for computation of diluted earnings per common share

    $ 99,751      $ 92,199      $ 86,957   
  

 

 

    

 

 

    

 

 

  

Denominator:

       

Weighted-average number of common shares outstanding-basic

      57,872        55,595        54,694   

Effect of dilutive securities:

       

Performance and restricted stock awards

      172        157        163   

Stock options

      48        72        85   
  

 

 

    

 

 

    

 

 

  

Weighted-average number of common shares outstanding-diluted

      58,092        55,824        54,942   
  

 

 

    

 

 

    

 

 

  

Potential shares excluded in calculation (1)

      —          —          218   

Earnings per common share attributable to Avista Corporation:

       

Basic

    $ 1.73      $ 1.66      $ 1.59   
  

 

 

    

 

 

    

 

 

  

Diluted

    $ 1.72      $ 1.65      $ 1.58   
  

 

 

    

 

 

    

 

 

  

 

(1) Certain stock options were excluded from the calculation because they were antidilutive based on the fact that the exercise price of the stock options was higher than the average market price of Avista Corp. common stock during the respective period.