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Earnings Per Share Attributable To Avista Corporation (Computation Of Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Numerator:
Net income from continuing operations attributable to Avista Corp. shareholders	$ 5,090	$ 10,119	$ 146,203	$ 90,586
Denominator:
Weighted-average number of common shares outstanding-basic	66,265	65,688	65,964	65,668
Performance and restricted stock awards	86	338	86	312
Weighted-average number of common shares outstanding-diluted	66,351	66,026	66,050	65,980
Earnings Per Share, Basic [Abstract]
Basic	$ 0.08	$ 0.15	$ 2.22	$ 1.38
Earnings Per Share, Diluted [Abstract]
Diluted	$ 0.08	$ 0.15	$ 2.21	$ 1.37

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