Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Common Stock, Dividends, Per Share, Cash Paid	$ 0.33	$ 0.3175	$ 0.99	$ 0.9525
Operating Revenues:
Utility revenues	$ 307,405	$ 291,262	$ 1,074,642	$ 1,031,491
Other non-utility revenues	6,244	10,296	22,829	29,225
Total operating revenues	313,649	301,558	1,097,471	1,060,716
Utility operating expenses:
Resource costs	138,210	131,588	488,886	481,007
Other operating expenses	74,315	72,509	220,599	207,195
Depreciation and amortization	36,303	33,294	106,279	95,200
Taxes other than income taxes	22,269	21,000	75,424	70,513
Other non-utility operating expenses:
Other operating expenses	6,462	10,251	22,924	20,514
Depreciation and amortization	178	154	512	452
Total operating expenses	277,737	268,796	914,624	874,881
Income from operations	35,912	32,762	182,847	185,835
Interest expense	19,951	18,642	59,719	55,933
Interest expense to affiliated trusts	120	113	347	336
Public Utilities, Allowance for Funds Used During Construction, Additions	(905)	(1,212)	(2,701)	(2,707)
Other income-net	(2,123)	(2,608)	(6,190)	(8,263)
Income before income taxes	18,869	17,827	131,672	140,536
Income tax expense	6,115	7,301	47,378	51,274
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest	12,754	10,526	84,294	89,262
Net income	13,043	10,471	84,779	160,034
Net income from discontinued operations	289	(55)	485	70,772
Net income attributable to noncontrolling interests	(32)	(20)	(73)	(213)
Income (Loss) from Continuing Operations Attributable to Parent	12,722	10,506	84,221	89,236
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	289	(55)	485	70,585
Net income attributable to Avista Corporation shareholders	$ 13,011	$ 10,451	$ 84,706	$ 159,821
Weighted-average common shares outstanding (thousands), basic	62,299	63,934	62,299	61,413
Weighted-average common shares outstanding (thousands), diluted	62,688	64,244	62,691	61,625
Income (Loss) from Continuing Operations, Per Basic Share	$ 0.21	$ 0.16	$ 1.35	$ 1.45
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share	0.00	0.00	0.01	1.15
Earnings per common share attributable to Avista Corporation shareholders:
Basic	0.21	0.16	1.36	2.60
Diluted (usd per share)	0.21	0.16	1.35	2.59
Income (Loss) from Continuing Operations, Per Diluted Share	0.21	0.16	1.34	1.45
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share	$ 0.00	$ 0.00	$ 0.01	$ 1.14