Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Operating Revenues:
Utility revenues	$ 291,640	$ 296,989	$ 1,030,906	$ 1,022,670
Other non-utility revenues	5,456	6,360	17,161	17,690
Total operating revenues	297,096	303,349	1,048,067	1,040,360
Utility operating expenses:
Resource costs	108,568	118,737	376,905	390,271
Other operating expenses	77,784	75,160	232,959	229,605
Acquisition costs	6,730	0	8,004	0
Depreciation and amortization	42,968	40,240	127,596	119,110
Taxes other than income taxes	23,269	22,669	79,733	74,669
Other non-utility operating expenses:
Other operating expenses	6,598	6,756	19,863	18,862
Depreciation and amortization	137	193	482	573
Total operating expenses	266,054	263,755	845,542	833,090
Income from operations	31,042	39,594	202,525	207,270
Interest expense	23,955	21,632	71,170	64,223
Interest expense to affiliated trusts	216	164	601	456
Capitalized interest	(899)	(507)	(2,513)	(2,258)
Other income-net	(1,841)	(1,562)	(6,598)	(7,025)
Income before income taxes	9,611	19,867	139,865	151,874
Income tax expense	5,153	7,606	51,548	54,661
Net income	4,458	12,261	88,317	97,213
Net income attributable to noncontrolling interests	(7)	(27)	21	(76)
Net income attributable to Avista Corporation shareholders	$ 4,451	$ 12,234	$ 88,338	$ 97,137
Weighted-average common shares outstanding (thousands), basic	64,412	63,857	64,392	63,282
Weighted-average common shares outstanding (thousands), diluted	64,892	64,325	64,638	63,687
Earnings per common share attributable to Avista Corporation shareholders:
Basic	$ 0.07	$ 0.19	$ 1.37	$ 1.53
Diluted	0.07	0.19	1.37	1.53
Common Stock, Dividends, Per Share, Cash Paid	$ 0.3575	$ 0.3425	$ 1.0725	$ 1.0275