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Earnings Per Common Share Attributable To Avista Corporation (Tables)
 12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Computations Of Earnings Per Share
 
2017
 
2016
 
2015
Numerator:
 
 
 
 
 
Net income from continuing operations attributable to Avista Corp. shareholders
$
115,916

 
$
137,228

 
$
118,080

Net income from discontinued operations attributable to Avista Corp. shareholders
$
—

 
$
—

 
$
5,147

Denominator:
 
 
 
 
 
Weighted-average number of common shares outstanding-basic
64,496

 
63,508

 
62,301

Effect of dilutive securities:
 
 
 
 
 
Performance and restricted stock awards
310

 
412

 
407

Weighted-average number of common shares outstanding-diluted
64,806

 
63,920

 
62,708

Earnings per common share attributable to Avista Corp. shareholders, basic:
 
 
 
 
 
Earnings per common share from continuing operations
$
1.80

 
$
2.16

 
$
1.90

Earnings per common share from discontinued operations
$
—

 
$
—

 
$
0.08

Total earnings per common share attributable to Avista Corp. shareholders, basic
$
1.80

 
$
2.16

 
$
1.98

Earnings per common share attributable to Avista Corp. shareholders, diluted:
 
 
 
 
 
Earnings per common share from continuing operations
$
1.79

 
$
2.15

 
$
1.89

Earnings per common share from discontinued operations
$
—

 
$
—

 
$
0.08

Total earnings per common share attributable to Avista Corp. shareholders, diluted
$
1.79

 
$
2.15

 
$
1.97

There were no shares excluded from the calculation because they were antidilutive.