Earnings Per Common Share Attributable To Avista Corporation (Tables)

9 Months Ended

Sep. 30, 2011

Earnings Per Common Share Attributable To Avista Corporation [Abstract]

Computations Of Earnings Per Share

	Three months ended						Nine months ended
	September 30,						September 30,
	2011			2010			2011			2010
Numerator:
Net income attributable to Avista Corporation	$	10,702		$	12,346		$	75,621		$	66,696
Subsidiary earnings adjustment for dilutive securities		(170	)		(92	)		(340	)		(170	)
Adjusted net income attributable to Avista Corporation for computation of diluted earnings per common share	$	10,532		$	12,254		$	75,281		$	66,526
Denominator:
Weighted-average number of common shares outstanding-basic		58,057			55,616			57,731			55,175
Effect of dilutive securities:
Contingent stock awards		131			113			149			134
Stock options		44			72			54			75
Weighted-average number of common shares outstanding-diluted		58,232			55,801			57,934			55,384
Potential shares excluded in calculation (1)		—			198			—			198
Earnings per common share attributable to Avista Corporation:
Basic	$	0.18		$	0.22		$	1.31		$	1.21
Diluted	$	0.18		$	0.22		$	1.30		$	1.20

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