Consolidated Statements Of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Common Stock, Dividends, Per Share, Cash Paid	$ 0.3175	$ 0.305	$ 0.9525	$ 0.915
Operating Revenues:
Utility revenues	$ 291,262	$ 278,473	$ 1,031,491	$ 1,007,319
Other non-utility revenues	10,296	11,004	29,225	30,145
Total operating revenues	301,558	289,477	1,060,716	1,037,464
Utility operating expenses:
Resource costs	131,588	131,136	481,007	487,277
Other operating expenses	72,509	69,596	207,195	200,824
Depreciation and amortization	33,294	29,823	95,200	86,783
Taxes other than income taxes	21,000	18,712	70,513	66,137
Other non-utility operating expenses:
Other operating expenses	10,251	10,212	20,514	28,972
Depreciation and amortization	154	171	452	536
Total operating expenses	268,796	259,650	874,881	870,529
Income from operations	32,762	29,827	185,835	166,935
Interest expense	18,642	19,168	55,933	57,854
Interest expense to affiliated trusts	113	117	336	352
Capitalized interest	(1,212)	(820)	(2,707)	(2,702)
Other income-net	(2,608)	(488)	(8,263)	(4,439)
Income before income taxes	17,827	11,850	140,536	115,870
Income tax expense	7,301	3,367	51,274	41,929
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest	10,526	8,483	89,262	73,941
Net income	10,471	11,931	160,034	80,762
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	(55)	3,448	70,772	6,821
Net income attributable to noncontrolling interests	(20)	(518)	(213)	(1,351)
Income (Loss) from Continuing Operations Attributable to Parent	10,506	8,450	89,236	73,882
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	(55)	2,963	70,585	5,529
Net income attributable to Avista Corporation shareholders	$ 10,451	$ 11,413	$ 159,821	$ 79,411
Weighted-average common shares outstanding (thousands), basic	63,934	59,994	61,413	59,933
Weighted-average common shares outstanding (thousands), diluted	64,244	60,032	61,625	59,964
Income (Loss) from Continuing Operations, Per Basic Share	$ 0.16	$ 0.14	$ 1.45	$ 1.23
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share	$ 0.00	$ 0.05	$ 1.15	$ 0.09
Earnings per common share attributable to Avista Corporation shareholders:
Basic (usd per share)	$ 0.16	$ 0.19	$ 2.60	$ 1.32
Diluted (usd per share)	$ 0.16	$ 0.19	$ 2.59	$ 1.32
Income (Loss) from Continuing Operations, Per Diluted Share	$ 0.16	$ 0.14	$ 1.45	$ 1.23
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share	$ 0.00	$ 0.05	$ 1.14	$ 0.09