Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Operating Revenues:
Utility revenues, exclusive of alternative revenue programs	$ 288,826	$ 309,134	$ 682,067	$ 717,490
Alternative revenue programs	9,725	3,570	5,067	(2,369)
Total utility revenues	298,551	312,704	687,134	715,121
Non-utility revenues	2,261	6,594	10,159	13,538
Total operating revenues	300,812	319,298	697,293	728,659
Utility operating expenses:
Resource costs	88,439	105,969	225,786	260,587
Other operating expenses	87,720	81,078	171,698	158,376
Merger transaction costs	11	983	19,675	1,655
Depreciation and amortization	55,479	45,651	104,393	90,384
Taxes other than income taxes	22,908	25,596	54,851	56,425
Other non-utility operating expenses:
Other operating expenses	6,332	6,543	13,687	13,367
Depreciation and amortization	155	199	364	380
Total operating expenses	261,044	266,019	590,454	581,174
Income from operations	39,768	53,279	106,839	147,485
Interest expense	25,511	25,170	51,162	49,946
Interest Expense, Other	351	302	708	555
Capitalized interest	(1,101)	(1,139)	(2,029)	(2,107)
Merger termination fee	0	0	(103,000)
Other income-net	(8,268)	(1,907)	(9,175)	2,572
Income before income taxes	23,275	30,853	169,173	96,519
Income tax expense (benefit)	(1,741)	5,209	28,276	15,919
Net income	25,016	25,644	140,897	80,600
Net income attributable to noncontrolling interests	303	(67)	216	(133)
Net income attributable to Avista Corporation shareholders	$ 25,319	$ 25,577	$ 141,113	$ 80,467
Weighted-average common shares outstanding (thousands), basic	65,894	65,677	65,814	65,658
Weighted-average common shares outstanding (thousands), diluted	65,963	65,983	65,883	65,957
Earnings per common share attributable to Avista Corporation shareholders:
Basic	$ 0.38	$ 0.39	$ 2.14	$ 1.23
Diluted	$ 0.38	$ 0.39	$ 2.14	$ 1.22