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Earnings Per Common Share Attributable To Avista Corporation (Tables)
 6 Months Ended
Jun. 30, 2013
Earnings Per Share [Abstract]  
Computations Of Earnings Per Share
 
Three months ended June 30,
 
Six months ended June 30,
 
2013
 
2012
 
2013
 
2012
Numerator:
 
 
 
 
 
 
 
Net income attributable to Avista Corporation shareholders
$
25,657

 
$
18,178

 
$
67,998

 
$
56,566

Subsidiary earnings adjustment for dilutive securities
(39
)
 
(47
)
 
(82
)
 
(9
)
Adjusted net income attributable to Avista Corporation shareholders for computation of diluted earnings per common share
$
25,618

 
$
18,131

 
$
67,916

 
$
56,557

Denominator:
 
 
 
 
 
 
 
Weighted-average number of common shares outstanding-basic
59,937

 
58,702

 
59,926

 
58,642

Effect of dilutive securities:
 
 
 
 
 
 
 
Performance and restricted stock awards
25

 
211

 
28

 
277

Stock options
—

 
11

 
—

 
18

Weighted-average number of common shares outstanding-diluted
59,962

 
58,924

 
59,954

 
58,937

Earnings per common share attributable to Avista Corporation shareholders:
Basic
$
0.43

 
$
0.31

 
$
1.13

 
$
0.96

Diluted
$
0.43

 
$
0.31

 
$
1.13

 
$
0.96

There were no shares excluded from the calculation because they were antidilutive. All stock options had exercise prices which were less than the average market price of Avista Corp. common stock during the respective period.