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Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 115,932	$ 137,316	$ 123,317
Other Comprehensive Income (Loss):
Change in unfunded benefit obligation for pension and other postretirement benefit plans - net of taxes of $(281), $(495) and $667, respectively	(522)	(918)	1,238
Total other comprehensive income (loss)	(522)	(918)	1,238
Comprehensive income	115,410	136,398	124,555
Comprehensive income attributable to noncontrolling interests	(16)	(88)	(90)
Comprehensive income attributable to Avista Corporation shareholders	$ 115,394	$ 136,310	$ 124,465

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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