Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Common Stock, Dividends, Per Share, Cash Paid	$ 0.33	$ 0.3175	$ 0.66	$ 0.635
Operating Revenues:
Utility revenues	$ 330,830	$ 303,105	$ 767,237	$ 740,229
Other non-utility revenues	6,502	9,475	16,585	18,929
Total operating revenues	337,332	312,580	783,822	759,158
Utility operating expenses:
Resource costs	141,116	128,922	350,676	349,419
Other operating expenses	73,112	67,349	146,284	134,686
Depreciation and amortization	35,676	31,180	69,976	61,906
Taxes other than income taxes	23,257	21,367	53,155	49,513
Other non-utility operating expenses:
Other operating expenses	6,646	880	16,462	10,263
Depreciation and amortization	165	151	334	298
Total operating expenses	279,972	249,849	636,887	606,085
Income from operations	57,360	62,731	146,935	153,073
Interest expense	19,866	18,547	39,768	37,291
Interest expense to affiliated trusts	115	112	227	223
Public Utilities, Allowance for Funds Used During Construction, Additions	(879)	(834)	(1,796)	(1,495)
Other income-net	(1,836)	(3,055)	(4,067)	(5,655)
Income before income taxes	40,094	47,961	112,803	122,709
Income tax expense	15,016	16,691	41,263	43,973
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest	25,078	31,270	71,540	78,736
Net income	25,274	100,582	71,736	149,563
Net income from discontinued operations	196	69,312	196	70,827
Net income attributable to noncontrolling interests	(28)	289	(41)	(193)
Income (Loss) from Continuing Operations Attributable to Parent	25,050	31,254	71,499	78,730
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	196	69,617	196	70,640
Net income attributable to Avista Corporation shareholders	$ 25,246	$ 100,871	$ 71,695	$ 149,370
Weighted-average common shares outstanding (thousands), basic	62,281	60,184	62,299	60,153
Weighted-average common shares outstanding (thousands), diluted	62,600	60,463	62,744	60,316
Income (Loss) from Continuing Operations, Per Basic Share	$ 0.41	$ 0.52	$ 1.15	$ 1.31
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share	0.00	1.16	0.00	1.17
Earnings per common share attributable to Avista Corporation shareholders:
Basic	0.41	1.68	1.15	2.48
Diluted (usd per share)	0.40	1.67	1.14	2.48
Income (Loss) from Continuing Operations, Per Diluted Share	0.40	0.52	1.14	1.31
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share	$ 0.00	$ 1.15	$ 0.00	$ 1.17