Consolidated Statements Of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Common Stock, Dividends, Per Share, Cash Paid	$ 0.33	$ 0.3175
Operating Revenues:
Utility revenues	$ 436,407us-gaap_UtilityRevenue	$ 437,124us-gaap_UtilityRevenue
Other non-utility revenues	10,083us-gaap_OtherSalesRevenueNet	9,454us-gaap_OtherSalesRevenueNet
Total operating revenues	446,490us-gaap_Revenues	446,578us-gaap_Revenues
Utility operating expenses:
Resource costs	209,560	220,497
Other operating expenses	73,172	67,337
Depreciation and amortization	34,300	30,726
Taxes other than income taxes	29,898us-gaap_UtilitiesOperatingExpenseTaxes	28,146us-gaap_UtilitiesOperatingExpenseTaxes
Other non-utility operating expenses:
Other operating expenses	9,816us-gaap_OtherCostAndExpenseOperating	9,383us-gaap_OtherCostAndExpenseOperating
Depreciation and amortization	169us-gaap_DepreciationAndAmortization	147us-gaap_DepreciationAndAmortization
Total operating expenses	356,915us-gaap_CostsAndExpenses	356,236us-gaap_CostsAndExpenses
Income from operations	89,575us-gaap_OperatingIncomeLoss	90,342us-gaap_OperatingIncomeLoss
Interest expense	19,902us-gaap_InterestExpense	18,744us-gaap_InterestExpense
Interest expense to affiliated trusts	112us-gaap_InterestExpenseOther	111us-gaap_InterestExpenseOther
Capitalized interest	(917)	(661)
Other income-net	(2,231)us-gaap_OtherNonoperatingIncomeExpense	(2,600)us-gaap_OtherNonoperatingIncomeExpense
Income before income taxes	72,709	74,748
Income tax expense	26,247us-gaap_IncomeTaxExpenseBenefit	27,282us-gaap_IncomeTaxExpenseBenefit
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest	46,462	47,466
Net income	46,462us-gaap_ProfitLoss	48,981us-gaap_ProfitLoss
Net income from discontinued operations	0	1,515
Net income attributable to noncontrolling interests	(13)	(482)
Income (Loss) from Continuing Operations Attributable to Parent	46,449	47,476
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	0	1,023
Net income attributable to Avista Corporation shareholders	$ 46,449us-gaap_NetIncomeLoss	$ 48,499us-gaap_NetIncomeLoss
Weighted-average common shares outstanding (thousands), basic	62,318	60,122
Weighted-average common shares outstanding (thousands), diluted	62,889	60,168
Income (Loss) from Continuing Operations, Per Basic Share	$ 0.75	$ 0.79
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share	$ 0.00	$ 0.02
Earnings per common share attributable to Avista Corporation shareholders:
Basic (usd per share)	$ 0.75us-gaap_EarningsPerShareBasic	$ 0.81us-gaap_EarningsPerShareBasic
Diluted (usd per share)	$ 0.74us-gaap_EarningsPerShareDiluted	$ 0.81us-gaap_EarningsPerShareDiluted
Income (Loss) from Continuing Operations, Per Diluted Share	$ 0.74	$ 0.79
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share	$ 0.00	$ 0.02

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