Consolidated Statements Of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Common Stock, Dividends, Per Share, Cash Paid	$ 0.3175	$ 0.305	$ 0.635	$ 0.61
Operating Revenues:
Utility revenues	$ 303,105	$ 297,719	$ 740,229	$ 728,846
Other non-utility revenues	9,475	9,769	18,929	19,141
Total operating revenues	312,580	307,488	759,158	747,987
Utility operating expenses:
Resource costs	128,922	126,511	349,419	356,141
Other operating expenses	67,349	65,784	134,686	131,228
Depreciation and amortization	31,180	29,025	61,906	56,960
Taxes other than income taxes	21,367	21,608	49,513	47,425
Other non-utility operating expenses:
Other operating expenses	880	9,415	10,263	18,760
Depreciation and amortization	151	175	298	365
Total operating expenses	249,849	252,518	606,085	610,879
Income from operations	62,731	54,970	153,073	137,108
Interest expense	18,547	19,438	37,291	38,686
Interest expense to affiliated trusts	112	117	223	235
Capitalized interest	(834)	(942)	(1,495)	(1,882)
Other income-net	(3,055)	(2,192)	(5,655)	(3,951)
Income before income taxes	47,961	38,549	122,709	104,020
Income tax expense	16,691	14,310	43,973	38,562
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest	31,270	24,239	78,736	65,458
Net income	100,582	25,730	149,563	68,831
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	69,312	1,491	70,827	3,373
Net income attributable to noncontrolling interests	289	(73)	(193)	(833)
Income (Loss) from Continuing Operations Attributable to Parent	31,254	24,212	78,730	65,432
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	69,617	1,445	70,640	2,566
Net income attributable to Avista Corporation shareholders	$ 100,871	$ 25,657	$ 149,370	$ 67,998
Weighted-average common shares outstanding (thousands), basic	60,184	59,937	60,153	59,926
Weighted-average common shares outstanding (thousands), diluted	60,463	59,962	60,316	59,954
Income (Loss) from Continuing Operations, Per Basic Share	$ 0.52	$ 0.40	$ 1.31	$ 1.09
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share	$ 1.16	$ 0.03	$ 1.17	$ 0.04
Earnings per common share attributable to Avista Corporation shareholders:
Basic (usd per share)	$ 1.68	$ 0.43	$ 2.48	$ 1.13
Diluted (usd per share)	$ 1.67	$ 0.43	$ 2.48	$ 1.13
Income (Loss) from Continuing Operations, Per Diluted Share	$ 0.52	$ 0.40	$ 1.31	$ 1.09
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share	$ 1.15	$ 0.03	$ 1.17	$ 0.04