Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Operating Revenues:
Utility revenues	$ 308,729	$ 312,888	$ 739,266	$ 725,681
Other non-utility revenues	5,772	5,950	11,705	11,330
Total operating revenues	314,501	318,838	750,971	737,011
Utility operating expenses:
Resource costs	102,751	109,815	268,337	271,534
Other operating expenses	81,965	78,666	156,449	154,445
Depreciation and amortization	42,643	39,678	84,628	78,870
Taxes other than income taxes	23,802	22,615	56,464	52,000
Other non-utility operating expenses:
Other operating expenses	7,086	6,281	13,265	12,106
Depreciation and amortization	157	192	345	380
Total operating expenses	258,404	257,247	579,488	569,335
Income from operations	56,097	61,591	171,483	167,676
Interest expense	23,670	21,318	47,215	42,591
Interest expense to affiliated trusts	200	154	385	292
Capitalized interest	(890)	(837)	(1,614)	(1,751)
Other income-net	(1,656)	(3,041)	(4,757)	(5,463)
Income before income taxes	34,773	43,997	130,254	132,007
Income tax expense	13,051	16,710	46,395	47,055
Net income	21,722	27,287	83,859	84,952
Net income attributable to noncontrolling interests	49	(33)	28	(49)
Net income attributable to Avista Corporation shareholders	$ 21,771	$ 27,254	$ 83,887	$ 84,903
Weighted-average common shares outstanding (thousands), basic	64,401	63,386	64,382	62,995
Weighted-average common shares outstanding (thousands), diluted	64,553	63,783	64,511	63,368
Earnings per common share attributable to Avista Corporation shareholders:
Basic	$ 0.34	$ 0.43	$ 1.30	$ 1.35
Diluted	0.34	0.43	1.30	1.34
Common Stock, Dividends, Per Share, Cash Paid	$ 0.3575	$ 0.3425	$ 0.7150	$ 0.6850