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Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 136,598	$ 115,932	$ 137,316
Other Comprehensive Income (Loss):
Change in unfunded benefit obligation for pension and other postretirement benefit plans - net of taxes of $523, $(281) and $(495), respectively	1,966	(522)	(918)
Total other comprehensive income (loss)	1,966	(522)	(918)
Comprehensive income	138,564	115,410	136,398
Comprehensive income attributable to noncontrolling interests	(169)	(16)	(88)
Comprehensive income attributable to Avista Corporation shareholders	$ 138,395	$ 115,394	$ 136,310

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