$AVA
AVISTA CORP Stock $ava

$ava Overview Financials Valuation SEC Filings Company Website

2011 Q4 Form 10-K Financial Statement

#000010491813000042 Filed on February 26, 2013

Income Statement

Concept	2011 Q4	2011 Q3	2011 Q2
Revenue	$438.9M	$343.7M	$360.6M
YoY Change	17.23%	-6.4%	-0.04%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$29.30M	$28.30M	$28.30M
YoY Change	3.17%	5.99%	7.2%
% of Gross Profit
Operating Expenses	$378.5M	$308.8M	$305.0M
YoY Change	21.51%	-6.25%	2.01%
Operating Profit	$58.32M	$33.65M	$53.64M
YoY Change
Interest Expense	-$17.20M	$18.70M	$18.27M
YoY Change	-21.82%	-202.2%	-198.77%
% of Operating Profit	-29.49%	55.59%	34.06%
Other Income/Expense, Net	-$1.500M	$1.957M	$1.597M
YoY Change	-31.82%	-277.91%	-222.85%
Pretax Income	$41.70M	$15.35M	$37.11M
YoY Change	7.75%	-16.55%	-11.43%
Income Tax	$15.70M	$3.717M	$13.58M
% Of Pretax Income	37.65%	24.21%	36.6%
Net Earnings	$24.60M	$10.70M	$23.00M
YoY Change	-4.27%	-12.99%	-9.8%
Net Earnings / Revenue	5.61%	3.11%	6.38%
Basic Earnings Per Share		$0.18	$0.40
Diluted Earnings Per Share	$0.42	$0.18	$0.39
COMMON SHARES
Basic Shares Outstanding	58.30M shares	58.06M shares	57.79M shares
Diluted Shares Outstanding	58.58M shares	58.23M shares	58.14M shares

Balance Sheet

Concept	2011 Q4	2011 Q3	2011 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments	$75.00M	$78.00M	$70.00M
YoY Change	8.7%	36.84%	79.49%
Cash & Equivalents	$74.66M	$78.10M	$69.92M
Short-Term Investments
Other Short-Term Assets	$49.23M	$216.0M	$161.0M
YoY Change	-75.75%	24.86%	14.18%
Inventory	$52.01M	$65.00M	$48.00M
Prepaid Expenses
Receivables	$203.0M	$155.0M	$165.0M
Other Receivables	$16.00M	$34.00M	$12.00M
Total Short-Term Assets	$614.6M	$548.0M	$455.0M
YoY Change	5.96%	19.39%	11.79%
LONG-TERM ASSETS
Property, Plant & Equipment	$2.860B	$2.801B	$2.764B
YoY Change	5.38%	4.71%	4.58%
Goodwill	$39.05M
YoY Change	50.55%
Intangibles
YoY Change
Long-Term Investments	$76.00M	$76.00M	$78.00M
YoY Change	-12.64%	-14.61%	-12.36%
Other Assets	$212.2M	$432.0M	$432.0M
YoY Change	-52.95%	2.37%	5.11%
Total Long-Term Assets	$3.600B	$3.421B	$3.388B
YoY Change	7.14%	3.86%	4.12%
TOTAL ASSETS
Total Short-Term Assets	$614.6M	$548.0M	$455.0M
Total Long-Term Assets	$3.600B	$3.421B	$3.388B
Total Assets	$4.215B	$3.969B	$3.843B
YoY Change	6.97%	5.76%	4.97%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$167.0M	$154.0M	$129.0M
YoY Change	-2.93%	3.36%	4.88%
Accrued Expenses	$12.00M	$8.000M	$13.00M
YoY Change	-45.45%	-69.23%	-50.0%
Deferred Revenue
YoY Change
Short-Term Debt	$96.00M	$97.00M	$75.00M
YoY Change	-12.73%	29.33%	-14.77%
Long-Term Debt Due	$21.00M	$21.00M	$20.00M
YoY Change	61.54%	-44.74%	-57.45%
Total Short-Term Liabilities	$627.2M	$577.0M	$455.0M
YoY Change	8.32%	8.46%	-4.61%
LONG-TERM LIABILITIES
Long-Term Debt	$1.254B	$1.173B	$1.186B
YoY Change	4.5%	2.89%	3.76%
Other Long-Term Liabilities	$116.1M	$481.0M	$488.0M
YoY Change	-76.5%	5.48%	14.55%
Total Long-Term Liabilities	$116.1M	$1.654B	$1.674B
YoY Change	-93.15%	3.63%	6.69%
TOTAL LIABILITIES
Total Short-Term Liabilities	$627.2M	$577.0M	$455.0M
Total Long-Term Liabilities	$116.1M	$1.654B	$1.674B
Total Liabilities	$2.977B	$2.798B	$2.675B
YoY Change	5.79%	5.74%	3.88%
SHAREHOLDERS EQUITY
Retained Earnings	$336.2M
YoY Change
Common Stock	$855.2M
YoY Change
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$1.186B	$1.170B	$1.168B
YoY Change
Total Liabilities & Shareholders Equity	$4.215B	$3.969B	$3.843B
YoY Change	6.97%	5.76%	4.97%

Cashflow Statement

Concept	2011 Q4	2011 Q3	2011 Q2
OPERATING ACTIVITIES
Net Income	$24.60M	$10.70M	$23.00M
YoY Change	-4.27%	-12.99%	-9.8%
Depreciation, Depletion And Amortization	$29.30M	$28.30M	$28.30M
YoY Change	3.17%	5.99%	7.2%
Cash From Operating Activities	$29.10M	$76.90M	$60.20M
YoY Change	8.99%	-11.51%	78.64%
INVESTING ACTIVITIES
Capital Expenditures	-$71.10M	-$71.80M	-$50.40M
YoY Change	8.88%	23.37%	31.94%
Acquisitions
YoY Change
Other Investing Activities	-$43.50M	-$31.90M	-$13.80M
YoY Change	22.19%	254.44%	-4700.0%
Cash From Investing Activities	-$114.6M	-$103.7M	-$64.20M
YoY Change	13.69%	54.32%	69.39%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	82.10M	35.00M	12.00M
YoY Change	-5.52%	-2287.5%	287.1%
NET CHANGE
Cash From Operating Activities	29.10M	76.90M	60.20M
Cash From Investing Activities	-114.6M	-103.7M	-64.20M
Cash From Financing Activities	82.10M	35.00M	12.00M
Net Change In Cash	-3.400M	8.200M	8.000M
YoY Change	-126.56%	-54.7%	-827.27%
FREE CASH FLOW
Cash From Operating Activities	$29.10M	$76.90M	$60.20M
Capital Expenditures	-$71.10M	-$71.80M	-$50.40M
Free Cash Flow	$100.2M	$148.7M	$110.6M
YoY Change	8.91%	2.48%	53.82%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
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CY2012Q4	us-gaap	Accounts Notes And Loans Receivable Net Current AccountsNotesAndLoansReceivableNetCurrent	193683000	USD
CY2011Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	166954000	USD
CY2012Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	198914000	USD
CY2005Q2	us-gaap	Accrual For Environmental Loss Contingencies Component Amount AccrualForEnvironmentalLossContingenciesComponentAmount	500000	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	134000	USD
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	167000	USD
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	6867000	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	5771000	USD
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-6700000	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-5637000	USD
CY2012Q4	us-gaap	Additional Collateral Aggregate Fair Value AdditionalCollateralAggregateFairValue	25800000	USD
CY2010	us-gaap	Additions To Noncurrent Assets AdditionsToNoncurrentAssets	204656000	USD
CY2011	us-gaap	Additions To Noncurrent Assets AdditionsToNoncurrentAssets	243372000	USD
CY2012	us-gaap	Additions To Noncurrent Assets AdditionsToNoncurrentAssets	275974000	USD
CY2012	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	5792000	USD
CY2011	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	5756000	USD
CY2010	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	4916000	USD
CY2012Q4	us-gaap	Amount Of Regulatory Costs Not Yet Approved AmountOfRegulatoryCostsNotYetApproved	311086000	USD
CY2010	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
CY2012	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
CY2011	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
CY2011Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	43958000	USD
CY2012Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	44155000	USD
CY2009Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	42928000	USD
CY2010Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	44883000	USD
CY2011	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	4617000	USD
CY2012	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	3803000	USD
CY2010	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	4414000	USD
CY2011	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	4682000	USD
CY2012	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	10435000	USD
CY2010	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	3755000	USD
CY2010Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	3887000	USD
CY2009Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	3971000	USD
CY2011Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	3513000	USD
CY2012Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	3168000	USD
CY2010	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	-357000	USD
CY2011	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	-238000	USD
CY2012	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	-214000	USD
CY2011	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	0	USD
CY2010	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	19000	USD
CY2012	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	0	USD
CY2010	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	460000	USD
CY2012	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	559000	USD
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CY2011	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	612000	USD
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CY2011Q4	us-gaap	Assets Assets	4214531000	USD
CY2012Q4	us-gaap	Assets Current AssetsCurrent	505794000	USD
CY2011Q4	us-gaap	Assets Current AssetsCurrent	614556000	USD
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CY2012Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	59321000	USD
CY2011Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	96579000	USD
CY2012Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	59057000	USD
CY2011Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	96368000	USD
CY2012Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	41485000	USD
CY2011Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	41028000	USD
CY2012Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	11786000	USD
CY2011Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	55126000	USD
CY2012Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	3003000	USD
CY2011Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	0	USD
CY2011Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	425000	USD
CY2012Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	3047000	USD
CY2012	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	500000	USD
CY2012Q4	us-gaap	Available For Sale Securities Gross Unrealized Gain Loss AvailableForSaleSecuritiesGrossUnrealizedGainLoss	264000	USD
CY2011Q4	us-gaap	Available For Sale Securities Gross Unrealized Gain Loss AvailableForSaleSecuritiesGrossUnrealizedGainLoss	211000	USD
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CY2011Q4	us-gaap	Business Acquisition Contingent Consideration Potential Cash Payment BusinessAcquisitionContingentConsiderationPotentialCashPayment	0	USD
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CY2011	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	20629000	USD
CY2012	us-gaap	Capital Lease Obligations Incurred CapitalLeaseObligationsIncurred	0	USD
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CY2011	us-gaap	Capital Lease Obligations Incurred CapitalLeaseObligationsIncurred	0	USD
CY2012Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	75464000	USD
CY2011Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	74662000	USD
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CY2012	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	802000	USD
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CY2011Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
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CY2012Q4	us-gaap	Common Stock Value CommonStockValue	889237000	USD
CY2011Q4	us-gaap	Common Stock Value CommonStockValue	855188000	USD
CY2012	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	77147000	USD
CY2010	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	90449000	USD
CY2011	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	98913000	USD
CY2010	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	2523000	USD
CY2012	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	590000	USD
CY2011	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	3315000	USD
CY2012	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	77737000	USD
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CY2011	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	102228000	USD
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CY2012Q4	us-gaap	Contractual Obligation Due After Fifth Year ContractualObligationDueAfterFifthYear	42988000	USD
CY2012Q4	us-gaap	Contractual Obligation Due In Fifth Year ContractualObligationDueInFifthYear	3220000	USD
CY2012Q4	us-gaap	Contractual Obligation Due In Fourth Year ContractualObligationDueInFourthYear	3222000	USD
CY2012Q4	us-gaap	Contractual Obligation Due In Next Twelve Months ContractualObligationDueInNextTwelveMonths	3348000	USD
CY2012Q4	us-gaap	Contractual Obligation Due In Second Year ContractualObligationDueInSecondYear	3332000	USD
CY2012Q4	us-gaap	Contractual Obligation Due In Third Year ContractualObligationDueInThirdYear	3223000	USD
CY2012	us-gaap	Cost Of Purchased Power CostOfPurchasedPower	8436000	USD
CY2010	us-gaap	Cost Of Purchased Power CostOfPurchasedPower	8287000	USD
CY2011	us-gaap	Cost Of Purchased Power CostOfPurchasedPower	10533000	USD
CY2012	us-gaap	Cost Of Services Depreciation And Amortization CostOfServicesDepreciationAndAmortization	792000	USD
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CY2011	us-gaap	Costs And Expenses CostsAndExpenses	1391776000	USD
CY2010	us-gaap	Costs And Expenses CostsAndExpenses	1339006000	USD
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CY2012	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	19812000	USD
CY2010	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	13423000	USD
CY2011	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	32625000	USD
CY2012Q4	us-gaap	Customer Refund Liability Current CustomerRefundLiabilityCurrent	200000	USD
CY1998Q4	us-gaap	Debt Instrument Interest Rate Stated Percentage DebtInstrumentInterestRateStatedPercentage	0.0845
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CY2011Q4	us-gaap	Debt Instrument Unamortized Discount DebtInstrumentUnamortizedDiscount	1626000	USD
CY2012Q4	us-gaap	Debt Instrument Unamortized Discount DebtInstrumentUnamortizedDiscount	1453000	USD
CY2012	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	21449000	USD
CY2011	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	24007000	USD
CY2010	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	37734000	USD
CY2011Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	677229000	USD
CY2012Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	691845000	USD
CY2012	us-gaap	Deferred Purchased Power Costs DeferredPurchasedPowerCosts	22200000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Derivative Instruments DeferredTaxAssetsDerivativeInstruments	38999000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Derivative Instruments DeferredTaxAssetsDerivativeInstruments	22953000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	201748000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	201856000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Net Current DeferredTaxAssetsNetCurrent	30473000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Other Loss Carryforwards DeferredTaxAssetsOtherLossCarryforwards	14867000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Other Loss Carryforwards DeferredTaxAssetsOtherLossCarryforwards	11136000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Regulatory Assets And Liabilities DeferredTaxAssetsRegulatoryAssetsAndLiabilities	79406000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Regulatory Assets And Liabilities DeferredTaxAssetsRegulatoryAssetsAndLiabilities	84576000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	16924000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	19401000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Other DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther	3631000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Other DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther	3248000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Pensions DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions	94891000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Pensions DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions	80939000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Allowance For Doubtful Accounts DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts	12086000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Allowance For Doubtful Accounts DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts	12140000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Reserves DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves	6302000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Reserves DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves	5923000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	489989000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	475481000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Derivatives DeferredTaxLiabilitiesDerivatives	38992000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Derivatives DeferredTaxLiabilitiesDerivatives	22954000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	8334000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	5582000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	524877000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	505954000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	18227000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	14505000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	478604000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Regulatory Assets DeferredTaxLiabilitiesRegulatoryAssets	107243000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Regulatory Assets DeferredTaxLiabilitiesRegulatoryAssets	91125000	USD
CY2012	us-gaap	Defined Benefit Plan Amortization Of Transition Obligations Assets DefinedBenefitPlanAmortizationOfTransitionObligationsAssets	34500000	USD
CY2012	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	-44000000	USD
CY2010	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	-21000000	USD
CY2011	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	-26000000	USD
CY2012	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Decrease On Accumulated Postretirement Benefit Obligation1 DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnAccumulatedPostretirementBenefitObligation1	16700000	USD
CY2012	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Decrease On Service And Interest Cost Components1 DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnServiceAndInterestCostComponents1	1100000	USD
CY2012	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Increase On Accumulated Postretirement Benefit Obligation DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnAccumulatedPostretirementBenefitObligation	20800000	USD
CY2012	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Increase On Service And Interest Cost Components DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents	1400000	USD
CY2012	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	8168000	USD
CY2010	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	5405000	USD
CY2011	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	7027000	USD
CY2010	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	107626000	USD
CY2011	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	113600000	USD
CY2012	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	126402000	USD
CY2012Q4	us-gaap	Derivative Assets Liabilities At Fair Value Net DerivativeAssetsLiabilitiesAtFairValueNet	-44762000	USD
CY2011Q4	us-gaap	Derivative Assets Liabilities At Fair Value Net DerivativeAssetsLiabilitiesAtFairValueNet	-128893000	USD
CY2012Q4	us-gaap	Derivative Fair Value Amount Offset Against Collateral Net DerivativeFairValueAmountOffsetAgainstCollateralNet	9707000	USD
CY2012Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	89297000	USD
CY2011Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	86233000	USD
CY2012Q4	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	143766000	USD
CY2011Q4	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	215126000	USD
CY2012Q4	us-gaap	Derivative Net Liability Position Aggregate Fair Value DerivativeNetLiabilityPositionAggregateFairValue	35900000	USD
CY2012	us-gaap	Derivatives Reporting Of Derivative Activity DerivativesReportingOfDerivativeActivity	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-top:12px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">Derivative Assets and Liabilities</font></div><div style="line-height:120%;padding-top:6px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Derivatives are recorded as either assets or liabilities on the Consolidated Balance Sheets measured at estimated fair value. In certain defined conditions, a derivative may be specifically designated as a hedge for a particular exposure. The accounting for derivatives depends on the intended use of the derivatives and the resulting designation.</font></div><div style="line-height:120%;padding-top:12px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The Washington Utilities and Transportation Commission (UTC) and the Idaho Public Utilities Commission (IPUC) issued accounting orders authorizing Avista Utilities to offset commodity derivative assets or liabilities with a regulatory asset or liability. This accounting treatment is intended to defer the recognition of mark-to-market gains and losses on energy commodity transactions until the period of settlement. The orders provide for Avista Utilities to not recognize the unrealized gain or loss on utility derivative commodity instruments in the Consolidated Statements of Income. Realized gains or losses are recognized in the period of settlement, subject to approval for recovery through retail rates. Realized gains and losses, subject to regulatory approval, result in adjustments to retail rates through purchased gas cost adjustments, the Energy Recovery Mechanism (ERM) in Washington, the Power Cost Adjustment (PCA) mechanism in Idaho, and periodic general rates cases. Regulatory assets are assessed regularly and are probable for recovery through future rates.</font></div><div style="line-height:120%;padding-top:12px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Substantially all forward contracts to purchase or sell power and natural gas are recorded as derivative assets or liabilities at estimated fair value with an offsetting regulatory asset or liability. Contracts that are not considered derivatives are accounted for on the accrual basis until they are settled or realized, unless there is a decline in the fair value of the contract that is determined to be other than temporary.</font></div></div>
CY2012	us-gaap	Dilutive Securities DilutiveSecurities	-38000	USD
CY2011	us-gaap	Dilutive Securities DilutiveSecurities	-473000	USD
CY2010	us-gaap	Dilutive Securities DilutiveSecurities	-226000	USD
CY2011	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.73
CY2012	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.32
CY2010	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.66
CY2010	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.65
CY2012	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.32
CY2011	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.72
CY2012Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.26
CY2012Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.10
CY2011Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.18
CY2012Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.65
CY2011Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.73
CY2011Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.42
CY2012Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.31
CY2011Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.39
CY2012	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2012	us-gaap	Employee Service Share Based Compensation Cash Received From Exercise Of Stock Options EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions	951000	USD
CY2011	us-gaap	Employee Service Share Based Compensation Cash Received From Exercise Of Stock Options EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions	1318000	USD
CY2010	us-gaap	Employee Service Share Based Compensation Cash Received From Exercise Of Stock Options EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions	2179000	USD
CY2010	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	1720000	USD
CY2012	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	2027000	USD
CY2011	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	2014000	USD
CY2011Q4	us-gaap	Energy Marketing Contract Liabilities Current EnergyMarketingContractLiabilitiesCurrent	70824000	USD
CY2012Q4	us-gaap	Energy Marketing Contract Liabilities Current EnergyMarketingContractLiabilitiesCurrent	29515000	USD
CY2011Q4	us-gaap	Energy Marketing Contracts Assets Current EnergyMarketingContractsAssetsCurrent	1139000	USD
CY2012Q4	us-gaap	Energy Marketing Contracts Assets Current EnergyMarketingContractsAssetsCurrent	4139000	USD
CY2012Q4	us-gaap	Energy Marketing Contracts Assets Noncurrent EnergyMarketingContractsAssetsNoncurrent	1093000	USD
CY2011Q4	us-gaap	Energy Marketing Contracts Assets Noncurrent EnergyMarketingContractsAssetsNoncurrent	185000	USD
CY2012Q4	us-gaap	Energy Related Inventory Natural Gas In Storage EnergyRelatedInventoryNaturalGasInStorage	17276000	USD
CY2011Q4	us-gaap	Energy Related Inventory Natural Gas In Storage EnergyRelatedInventoryNaturalGasInStorage	23610000	USD
CY2012Q4	us-gaap	Equity Method Investment Ownership Percentage EquityMethodInvestmentOwnershipPercentage	1
CY2010	us-gaap	Excise Taxes Collected ExciseTaxesCollected	49953000	USD
CY2012	us-gaap	Excise Taxes Collected ExciseTaxesCollected	53716000	USD
CY2011	us-gaap	Excise Taxes Collected ExciseTaxesCollected	55739000	USD
CY2012Q4	us-gaap	Finite Lived Computer Software Gross FiniteLivedComputerSoftwareGross	33990000	USD
CY2011Q4	us-gaap	Finite Lived Computer Software Gross FiniteLivedComputerSoftwareGross	29327000	USD
CY2011Q4	us-gaap	Finite Lived Customer Relationships Gross FiniteLivedCustomerRelationshipsGross	18859000	USD
CY2012Q4	us-gaap	Finite Lived Customer Relationships Gross FiniteLivedCustomerRelationshipsGross	32059000	USD
CY2011Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	16629000	USD
CY2012Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	26030000	USD
CY2012Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	9893000	USD
CY2012Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	5222000	USD
CY2012Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	6116000	USD
CY2012Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	7238000	USD
CY2012Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	9621000	USD
CY2012Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	72286000	USD
CY2011Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	51251000	USD
CY2012Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	46256000	USD
CY2011Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	34622000	USD
CY2011	us-gaap	Gain Loss On Investments GainLossOnInvestments	-488000	USD
CY2010	us-gaap	Gain Loss On Investments GainLossOnInvestments	-3297000	USD
CY2012	us-gaap	Gain Loss On Investments GainLossOnInvestments	-3343000	USD
CY2012Q4	us-gaap	Goodwill Goodwill	75959000	USD
CY2011Q4	us-gaap	Goodwill Goodwill	39045000	USD
CY2010Q4	us-gaap	Goodwill Goodwill	25935000	USD
CY2011	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	12933000	USD
CY2012	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	33484000	USD
CY2012	us-gaap	Goodwill Allocation Adjustment GoodwillAllocationAdjustment	3430000	USD
CY2011	us-gaap	Goodwill Allocation Adjustment GoodwillAllocationAdjustment	177000	USD
CY2011	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	160171000	USD
CY2012	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	120061000	USD
CY2010	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	146105000	USD
CY2012	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	41261000	USD
CY2011	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	56632000	USD
CY2010	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	51157000	USD
CY2012	us-gaap	Income Tax Expense Benefit Continuing Operations IncomeTaxExpenseBenefitContinuingOperations	41261000	USD
CY2010	us-gaap	Income Tax Expense Benefit Continuing Operations IncomeTaxExpenseBenefitContinuingOperations	51157000	USD
CY2011	us-gaap	Income Tax Expense Benefit Continuing Operations IncomeTaxExpenseBenefitContinuingOperations	56632000	USD
CY2012	us-gaap	Interest Paid InterestPaid	74900000	USD
CY2012Q4	us-gaap	Inventory Net InventoryNet	47455000	USD
CY2010	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	11248000	USD
CY2012	us-gaap	Income Tax Reconciliation Deductions Qualified Production Activities IncomeTaxReconciliationDeductionsQualifiedProductionActivities	1100000	USD
CY2011	us-gaap	Income Tax Reconciliation Deductions Qualified Production Activities IncomeTaxReconciliationDeductionsQualifiedProductionActivities	1099000	USD
CY2010	us-gaap	Income Tax Reconciliation Deductions Qualified Production Activities IncomeTaxReconciliationDeductionsQualifiedProductionActivities	1630000	USD
CY2011	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	56060000	USD
CY2010	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	51137000	USD
CY2012	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	42021000	USD
CY2010	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-705000	USD
CY2012	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-879000	USD
CY2011	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-977000	USD
CY2012	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	985000	USD
CY2010	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	624000	USD
CY2011	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	687000	USD
CY2011	us-gaap	Income Tax Reconciliation Tax Settlements IncomeTaxReconciliationTaxSettlements	163000	USD
CY2012	us-gaap	Income Tax Reconciliation Tax Settlements IncomeTaxReconciliationTaxSettlements	-2198000	USD
CY2010	us-gaap	Income Tax Reconciliation Tax Settlements IncomeTaxReconciliationTaxSettlements	-1030000	USD
CY2010	us-gaap	Income Taxes Paid IncomeTaxesPaid	14153000	USD
CY2012	us-gaap	Income Taxes Paid IncomeTaxesPaid	8069000	USD
CY2011	us-gaap	Income Taxes Paid IncomeTaxesPaid	26451000	USD
CY2011Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	15378000	USD
CY2012Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	2777000	USD
CY2010	us-gaap	Increase Decrease In Accounts And Notes Receivable IncreaseDecreaseInAccountsAndNotesReceivable	19081000	USD
CY2011	us-gaap	Increase Decrease In Accounts And Notes Receivable IncreaseDecreaseInAccountsAndNotesReceivable	-30616000	USD
CY2012	us-gaap	Increase Decrease In Accounts And Notes Receivable IncreaseDecreaseInAccountsAndNotesReceivable	-8100000	USD
CY2012	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	30189000	USD
CY2010	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	13606000	USD
CY2011	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-18032000	USD
CY2012	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-4551000	USD
CY2011	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	3388000	USD
CY2011	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	23881000	USD
CY2010	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	9230000	USD
CY2012	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-27258000	USD
CY2012	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-6474000	USD
CY2010	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	5189000	USD
CY2011	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-188000	USD
CY2011	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	172000	shares
CY2012	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	162000	shares
CY2010	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	157000	shares
CY2012	us-gaap	Interest Expense InterestExpense	76894000	USD
CY2011	us-gaap	Interest Expense InterestExpense	73876000	USD
CY2010	us-gaap	Interest Expense InterestExpense	75789000	USD
CY2012	us-gaap	Interest Expense Other InterestExpenseOther	541000	USD
CY2011	us-gaap	Interest Expense Other InterestExpenseOther	332000	USD
CY2010	us-gaap	Interest Expense Other InterestExpenseOther	635000	USD
CY2010	us-gaap	Interest Paid InterestPaid	74195000	USD
CY2011	us-gaap	Interest Paid InterestPaid	69083000	USD
CY2011Q4	us-gaap	Inventory Net InventoryNet	52006000	USD
CY2012Q4	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	26058000	USD
CY2011Q4	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	24148000	USD
CY2010	us-gaap	Investment Income Interest InvestmentIncomeInterest	1159000	USD
CY2011	us-gaap	Investment Income Interest InvestmentIncomeInterest	1327000	USD
CY2012	us-gaap	Investment Income Interest InvestmentIncomeInterest	944000	USD
CY2011Q4	us-gaap	Investments And Other Noncurrent Assets InvestmentsAndOtherNoncurrentAssets	45687000	USD
CY2012Q4	us-gaap	Investments And Other Noncurrent Assets InvestmentsAndOtherNoncurrentAssets	46542000	USD
CY2012Q4	us-gaap	Investments In Affiliates Subsidiaries Associates And Joint Ventures InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	11547000	USD
CY2011Q4	us-gaap	Investments In Affiliates Subsidiaries Associates And Joint Ventures InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	11547000	USD
CY2012Q4	us-gaap	Jointly Owned Utility Plant Proportionate Ownership Share JointlyOwnedUtilityPlantProportionateOwnershipShare	0.15
CY2007Q1	us-gaap	Jointly Owned Utility Plant Proportionate Ownership Share JointlyOwnedUtilityPlantProportionateOwnershipShare	0.15
CY1997Q4	us-gaap	Junior Subordinated Debenture Owed To Unconsolidated Subsidiary Trust JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust	51500000	USD
CY2012Q4	us-gaap	Junior Subordinated Debenture Owed To Unconsolidated Subsidiary Trust JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust	51500000	USD
CY2011Q4	us-gaap	Junior Subordinated Debenture Owed To Unconsolidated Subsidiary Trust Noncurrent JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrustNoncurrent	51547000	USD
CY2012Q4	us-gaap	Junior Subordinated Debenture Owed To Unconsolidated Subsidiary Trust Noncurrent JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrustNoncurrent	51547000	USD
CY2012Q4	us-gaap	Liabilities Liabilities	3031106000	USD
CY2011Q4	us-gaap	Liabilities Liabilities	2976847000	USD
CY2012Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	4313179000	USD
CY2011Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	4214531000	USD
CY2012Q4	us-gaap	Liabilities Current LiabilitiesCurrent	576149000	USD
CY2011Q4	us-gaap	Liabilities Current LiabilitiesCurrent	627174000	USD
CY2011Q4	us-gaap	Lines Of Credit Current LinesOfCreditCurrent	96000000	USD
CY2012Q4	us-gaap	Lines Of Credit Current LinesOfCreditCurrent	52000000	USD
CY2012	us-gaap	Long Term Contract For Purchase Of Electric Power Amount Of Long Term Debt Or Lease Obligation Outstanding LongTermContractForPurchaseOfElectricPowerAmountOfLongTermDebtOrLeaseObligationOutstanding	33772000	USD
CY2012	us-gaap	Long Term Contract For Purchase Of Electric Power Annual Minimum Debt Service Payment Required LongTermContractForPurchaseOfElectricPowerAnnualMinimumDebtServicePaymentRequired	3299000	USD
CY2012	us-gaap	Long Term Contract For Purchase Of Electric Power Estimated Annual Cost LongTermContractForPurchaseOfElectricPowerEstimatedAnnualCost	8433000	USD
CY2012Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	1178367000	USD
CY2011Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	1169826000	USD
CY2011Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	7474000	USD
CY2012Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	50372000	USD
CY2012Q4	us-gaap	Long Term Line Of Credit LongTermLineOfCredit	54000000	USD
CY2011Q4	us-gaap	Long Term Line Of Credit LongTermLineOfCredit	0	USD
CY2011Q4	us-gaap	Long Term Pollution Control Bond LongTermPollutionControlBond	-83700000	USD
CY2012Q4	us-gaap	Long Term Pollution Control Bond LongTermPollutionControlBond	-83700000	USD
CY2012	us-gaap	Long Term Purchase Commitment Amount LongTermPurchaseCommitmentAmount	13221000	USD
CY2011	us-gaap	Long Term Purchase Commitment Amount LongTermPurchaseCommitmentAmount	13038000	USD
CY2010	us-gaap	Long Term Purchase Commitment Amount LongTermPurchaseCommitmentAmount	13426000	USD
CY2012Q4	us-gaap	Minority Interest MinorityInterest	17658000	USD
CY2011Q4	us-gaap	Minority Interest MinorityInterest	174000	USD
CY2012	us-gaap	Minority Interest Description MinorityInterestDescription	July 31, 2012
CY2012Q4	us-gaap	Minority Interest Ownership Percentage By Noncontrolling Owners MinorityInterestOwnershipPercentageByNoncontrollingOwners	0.210
CY2012Q4	us-gaap	Money Market Funds At Carrying Value MoneyMarketFundsAtCarryingValue	15084000	USD
CY2012	us-gaap	Nature Of Operations NatureOfOperations	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-top:6px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">Nature of Business</font></div><div style="line-height:120%;padding-top:6px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Avista Corporation (Avista Corp. or the Company) is an energy company engaged in the generation, transmission and distribution of energy, as well as other energy-related businesses. Avista Utilities is an operating division of Avista Corp., comprising the regulated utility operations. Avista Utilities generates, transmits and distributes electricity in parts of eastern Washington and northern Idaho. In addition, Avista Utilities has electric generating facilities in Montana and northern Oregon. Avista Utilities also provides natural gas distribution service in parts of eastern Washington and northern Idaho, as well as parts of northeastern and southwestern Oregon. Avista Capital, Inc. (Avista Capital), a wholly owned subsidiary of Avista Corp., is the parent company of all of the subsidiary companies in the non-utility businesses, except Spokane Energy, LLC (Spokane Energy). Avista Capital’s subsidiaries include Ecova, Inc. (Ecova), a </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">79.0 percent</font><font style="font-family:inherit;font-size:10pt;"> owned subsidiary as of </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">December 31, 2012</font><font style="font-family:inherit;font-size:10pt;">. Ecova is a provider of energy efficiency and other facility information and cost management programs and services for multi-site customers and utilities throughout North America. See Note 24 for business segment information.</font></div></div>
CY2012	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-21083000	USD
CY2011	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	18065000	USD
CY2010	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	57164000	USD
CY2012	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-294668000	USD
CY2011	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-282281000	USD
CY2010	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-253223000	USD
CY2012	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	316553000	USD
CY2011	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	269465000	USD
CY2010	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	228437000	USD
CY2011	us-gaap	Net Income Loss NetIncomeLoss	100224000	USD
CY2010	us-gaap	Net Income Loss NetIncomeLoss	92425000	USD
CY2012	us-gaap	Net Income Loss NetIncomeLoss	78210000	USD
CY2011Q1	us-gaap	Net Income Loss NetIncomeLoss	41918000	USD
CY2012Q4	us-gaap	Net Income Loss NetIncomeLoss	15858000	USD
CY2011Q2	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	527000	USD
CY2012Q1	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-175000	USD
CY2011Q4	us-gaap	Net Income Loss NetIncomeLoss	24603000	USD
CY2012Q3	us-gaap	Net Income Loss NetIncomeLoss	5786000	USD
CY2012Q1	us-gaap	Net Income Loss NetIncomeLoss	38388000	USD
CY2011Q2	us-gaap	Net Income Loss NetIncomeLoss	23001000	USD
CY2011Q3	us-gaap	Net Income Loss NetIncomeLoss	10702000	USD
CY2012Q2	us-gaap	Net Income Loss NetIncomeLoss	18178000	USD
CY2012Q2	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	354000	USD
CY2011Q4	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	1368000	USD
CY2012Q3	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	176000	USD
CY2011Q3	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	935000	USD
CY2011Q1	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	485000	USD
CY2012Q4	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	235000	USD
CY2010	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	92199000	USD
CY2012	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	78172000	USD
CY2011	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	99751000	USD
CY2012Q4	us-gaap	Number Of Foreign Currency Derivatives Held NumberOfForeignCurrencyDerivativesHeld	20
CY2011Q4	us-gaap	Number Of Foreign Currency Derivatives Held NumberOfForeignCurrencyDerivativesHeld	28
CY2012	us-gaap	Operating Income Loss OperatingIncomeLoss	190070000	USD
CY2011	us-gaap	Operating Income Loss OperatingIncomeLoss	228004000	USD
CY2010	us-gaap	Operating Income Loss OperatingIncomeLoss	219734000	USD
CY2011Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	33646000	USD
CY2012Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	76394000	USD
CY2012Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	41047000	USD
CY2012Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	26609000	USD
CY2012Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	46020000	USD
CY2011Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	82394000	USD
CY2011Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	53640000	USD
CY2011Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	58324000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	24852000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	6794000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	1308000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	1744000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	3771000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	6352000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	4883000	USD
CY2011	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	6463000	USD
CY2010	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	6080000	USD
CY2012	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	8152000	USD
CY2012	us-gaap	Other Amortization Of Deferred Charges OtherAmortizationOfDeferredCharges	6702000	USD
CY2010	us-gaap	Other Amortization Of Deferred Charges OtherAmortizationOfDeferredCharges	-9795000	USD
CY2011	us-gaap	Other Amortization Of Deferred Charges OtherAmortizationOfDeferredCharges	21870000	USD
CY2011Q4	us-gaap	Other Assets Current OtherAssetsCurrent	49225000	USD
CY2012Q4	us-gaap	Other Assets Current OtherAssetsCurrent	24641000	USD
CY2012Q4	us-gaap	Other Assets Miscellaneous Noncurrent OtherAssetsMiscellaneousNoncurrent	18928000	USD
CY2011Q4	us-gaap	Other Assets Miscellaneous Noncurrent OtherAssetsMiscellaneousNoncurrent	21787000	USD
CY2011Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	212209000	USD
CY2012Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	248670000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-1311000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-1063000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-1976000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	1096000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	1976000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	1445000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-590000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-1064000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-778000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeNetOfTax	0	USD
CY2010	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeNetOfTax	0	USD
CY2012	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeNetOfTax	-290000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeTax	-171000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeTax	0	USD
CY2010	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeTax	0	USD
CY2011	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	134000	USD
CY2010	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	0	USD
CY2012	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	323000	USD
CY2011	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	77000	USD
CY2012	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	191000	USD
CY2010	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	0	USD
CY2011	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	33117000	USD
CY2010	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	30386000	USD
CY2012	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	38041000	USD
CY2011Q4	us-gaap	Other Finite Lived Intangible Assets Gross OtherFiniteLivedIntangibleAssetsGross	3065000	USD
CY2012Q4	us-gaap	Other Finite Lived Intangible Assets Gross OtherFiniteLivedIntangibleAssetsGross	6237000	USD
CY2011	us-gaap	Other Income OtherIncome	280000	USD
CY2010	us-gaap	Other Income OtherIncome	1034000	USD
CY2012	us-gaap	Other Income OtherIncome	3301000	USD
CY2012Q4	us-gaap	Other Inventory OtherInventory	4121000	USD
CY2011Q4	us-gaap	Other Inventory OtherInventory	4248000	USD
CY2012Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	142544000	USD
CY2011Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	153929000	USD
CY2011Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	116084000	USD
CY2012Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	110215000	USD
CY2012Q4	us-gaap	Other Long Term Debt Current OtherLongTermDebtCurrent	14965000	USD
CY2011Q4	us-gaap	Other Long Term Debt Current OtherLongTermDebtCurrent	13668000	USD
CY2011Q4	us-gaap	Other Long Term Debt Noncurrent OtherLongTermDebtNoncurrent	32803000	USD
CY2012Q4	us-gaap	Other Long Term Debt Noncurrent OtherLongTermDebtNoncurrent	17838000	USD
CY2011Q4	us-gaap	Other Long Term Investments OtherLongTermInvestments	18783000	USD
CY2012Q4	us-gaap	Other Long Term Investments OtherLongTermInvestments	16333000	USD
CY2010	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	2497000	USD
CY2011	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	3433000	USD
CY2012	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	5025000	USD
CY2011	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	-4988000	USD
CY2012	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	5256000	USD
CY2010	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	-2365000	USD
CY2010	us-gaap	Other Sales Revenue Net OtherSalesRevenueNet	38859000	USD
CY2012	us-gaap	Other Sales Revenue Net OtherSalesRevenueNet	38953000	USD
CY2011	us-gaap	Other Sales Revenue Net OtherSalesRevenueNet	40410000	USD
CY2011	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	6435000	USD
CY2010	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	3480000	USD
CY2012	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	7475000	USD
CY2000	us-gaap	Payments For Repurchase Of Trust Preferred Securities PaymentsForRepurchaseOfTrustPreferredSecurities	10000000	USD
CY2010	us-gaap	Payments Of Debt Extinguishment Costs PaymentsOfDebtExtinguishmentCosts	10710000	USD
CY2011	us-gaap	Payments Of Debt Extinguishment Costs PaymentsOfDebtExtinguishmentCosts	0	USD
CY2012	us-gaap	Payments Of Debt Extinguishment Costs PaymentsOfDebtExtinguishmentCosts	0	USD
CY2012	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	764000	USD
CY2011	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	4477000	USD
CY2010	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	916000	USD
CY2011	us-gaap	Payments Of Dividends PaymentsOfDividends	63737000	USD
CY2010	us-gaap	Payments Of Dividends PaymentsOfDividends	55682000	USD
CY2012	us-gaap	Payments Of Dividends PaymentsOfDividends	68552000	USD
CY2011	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	96634000	USD
CY2010	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	0	USD
CY2012	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	100374000	USD
CY2010	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	3777000	USD
CY2012	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	50310000	USD
CY2011	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	31409000	USD
CY2010	us-gaap	Payments To Acquire Other Productive Assets PaymentsToAcquireOtherProductiveAssets	2429000	USD
CY2011	us-gaap	Payments To Acquire Other Productive Assets PaymentsToAcquireOtherProductiveAssets	3590000	USD
CY2012	us-gaap	Payments To Acquire Other Productive Assets PaymentsToAcquireOtherProductiveAssets	4787000	USD
CY2012	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	271187000	USD
CY2010	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	202227000	USD
CY2011	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	239782000	USD
CY2012	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	917000	USD
CY2011	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	6179000	USD
CY2010	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	2593000	USD
CY2011	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	32067000	USD
CY2010	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	24760000	USD
CY2012	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	39838000	USD
CY2011Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	246177000	USD
CY2012Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	283985000	USD
CY2012Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	10000000	shares
CY2011Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2012Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2012	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-top:12px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">Reclassifications</font></div><div style="line-height:120%;padding-top:12px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Certain prior year amounts on the Company's Consolidated Statements of Income, Consolidated Balance Sheets, and Consolidated Statements of Cash Flows have been reclassified to conform to the current year presentation. In the current year Consolidated Statements of Income, Ecova operating revenues and operating expenses have been reclassified to separate line items. Previously, such amounts had been classified within the line items captioned "Other non-utility revenues" and “Other non-utility operating expenses”, respectively. Also, see Note 1, “Other Income-Net”  concerning a corrective reclassification made to certain 2011 and 2010 operating expenses. In the current year Consolidated Balance Sheets, "Intangible assets" are presented as their own line item. These were previously included in "Other intangibles, property and investments, net", which has now been renamed to "Other property and investments, net". In the current year Consolidated Statements of Cash Flows, "Pension and other postretirement benefit expense" and "Amortization of Spokane Energy contract" have been added as their own line items. These were previously included in "Other" in the operating activities section. Also, "Payments for settlements with Coeur d'Alene Tribe" was previously included as its own line item in operating activities. This has how been included in "Other" in the operating activities section.</font></div></div>
CY2011	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	26463000	USD
CY2012	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	29079000	USD
CY2010	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	46235000	USD
CY2011	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	85000000	USD
CY2010	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	136365000	USD
CY2012	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	80000000	USD
CY2010	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	2300000	USD
CY2012	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	33000000	USD
CY2011	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	35000000	USD
CY2011	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	0	USD
CY2012	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	3714000	USD
CY2010	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	0	USD
CY2012	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	1061000	USD
CY2010	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-118000	USD
CY2011	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	530000	USD
CY2010	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	23000000	USD
CY2011	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-49000000	USD
CY2012	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-9000000	USD
CY2011	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	80000	USD
CY2012	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	137999000	USD
CY2010	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	0	USD
CY2012	us-gaap	Profit Loss ProfitLoss	78800000	USD
CY2011	us-gaap	Profit Loss ProfitLoss	103539000	USD
CY2010	us-gaap	Profit Loss ProfitLoss	94948000	USD
CY2012Q1	us-gaap	Profit Loss ProfitLoss	38213000	USD
CY2012Q2	us-gaap	Profit Loss ProfitLoss	18532000	USD
CY2011Q2	us-gaap	Profit Loss ProfitLoss	23528000	USD
CY2012Q3	us-gaap	Profit Loss ProfitLoss	5962000	USD
CY2011Q4	us-gaap	Profit Loss ProfitLoss	25971000	USD
CY2012Q4	us-gaap	Profit Loss ProfitLoss	16093000	USD
CY2011Q3	us-gaap	Profit Loss ProfitLoss	11637000	USD
CY2011Q1	us-gaap	Profit Loss ProfitLoss	42403000	USD
CY2012Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	4197742000	USD
CY2011Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	3966706000	USD
CY2011	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	2225000	USD
CY2012	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	4055000	USD
CY2010	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	3353000	USD
CY2010	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Interest PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest	-298000	USD
CY2011	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Interest PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest	-2942000	USD
CY2012	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Interest PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest	-2401000	USD
CY2011	us-gaap	Public Utilities Allowance For Funds Used During Construction Rate PublicUtilitiesAllowanceForFundsUsedDuringConstructionRate	0.0791
CY2012	us-gaap	Public Utilities Allowance For Funds Used During Construction Rate PublicUtilitiesAllowanceForFundsUsedDuringConstructionRate	0.0762
CY2010	us-gaap	Public Utilities Allowance For Funds Used During Construction Rate PublicUtilitiesAllowanceForFundsUsedDuringConstructionRate	0.0825
CY2011Q4	us-gaap	Public Utilities Property Plant And Equipment Accumulated Depreciation PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation	1105930000	USD
CY2012Q4	us-gaap	Public Utilities Property Plant And Equipment Accumulated Depreciation PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation	1174026000	USD
CY2011Q4	us-gaap	Public Utilities Property Plant And Equipment Construction Work In Progress PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress	79322000	USD
CY2012Q4	us-gaap	Public Utilities Property Plant And Equipment Construction Work In Progress PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress	143098000	USD
CY2010	us-gaap	Public Utilities Property Plant And Equipment Disclosure Of Composite Depreciation Rate For Plants In Service PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService	0.0284
CY2011	us-gaap	Public Utilities Property Plant And Equipment Disclosure Of Composite Depreciation Rate For Plants In Service PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService	0.0292
CY2012	us-gaap	Public Utilities Property Plant And Equipment Disclosure Of Composite Depreciation Rate For Plants In Service PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService	0.0292
CY2011Q4	us-gaap	Public Utilities Property Plant And Equipment Net PublicUtilitiesPropertyPlantAndEquipmentNet	2860776000	USD
CY2012Q4	us-gaap	Public Utilities Property Plant And Equipment Net PublicUtilitiesPropertyPlantAndEquipmentNet	3023716000	USD
CY2011Q4	us-gaap	Public Utilities Property Plant And Equipment Plant In Service PublicUtilitiesPropertyPlantAndEquipmentPlantInService	3887384000	USD
CY2012Q4	us-gaap	Public Utilities Property Plant And Equipment Plant In Service PublicUtilitiesPropertyPlantAndEquipmentPlantInService	4054644000	USD
CY2011	us-gaap	Quantifying Misstatement In Current Year Financial Statements Amount QuantifyingMisstatementInCurrentYearFinancialStatementsAmount	7600000	USD
CY2010	us-gaap	Quantifying Misstatement In Current Year Financial Statements Amount QuantifyingMisstatementInCurrentYearFinancialStatementsAmount	10500000	USD
CY2011Q4	us-gaap	Redeemable Noncontrolling Interest Equity Carrying Amount RedeemableNoncontrollingInterestEquityCarryingAmount	51809000	USD
CY2012Q4	us-gaap	Redeemable Noncontrolling Interest Equity Carrying Amount RedeemableNoncontrollingInterestEquityCarryingAmount	4938000	USD
CY2012Q4	us-gaap	Redeemable Noncontrolling Interest Equity Common Carrying Amount RedeemableNoncontrollingInterestEquityCommonCarryingAmount	0	USD
CY2011Q4	us-gaap	Redeemable Noncontrolling Interest Equity Common Carrying Amount RedeemableNoncontrollingInterestEquityCommonCarryingAmount	38893000	USD
CY2011Q4	us-gaap	Redeemable Noncontrolling Interest Equity Other Carrying Amount RedeemableNoncontrollingInterestEquityOtherCarryingAmount	12916000	USD
CY2011Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	336150000	USD
CY2012Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	376940000	USD
CY2012	us-gaap	Revenues Revenues	1547002000	USD
CY2012Q4	us-gaap	Redeemable Noncontrolling Interest Equity Other Carrying Amount RedeemableNoncontrollingInterestEquityOtherCarryingAmount	4938000	USD
CY2011Q4	us-gaap	Refundable Gas Costs RefundableGasCosts	12100000	USD
CY2012Q4	us-gaap	Refundable Gas Costs RefundableGasCosts	6900000	USD
CY2012Q4	us-gaap	Regulated Entity Other Assets Noncurrent RegulatedEntityOtherAssetsNoncurrent	534999000	USD
CY2011Q4	us-gaap	Regulated Entity Other Assets Noncurrent RegulatedEntityOtherAssetsNoncurrent	526990000	USD
CY2012Q4	us-gaap	Regulatory Assets RegulatoryAssets	566631000	USD
CY2011Q4	us-gaap	Regulatory Assets RegulatoryAssets	593677000	USD
CY2011Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	119738000	USD
CY2012Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	103946000	USD
CY2011Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	297929000	USD
CY2012Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	318643000	USD
CY2012Q4	us-gaap	Remaining Amounts Of Regulatory Assets For Which No Return On Investment During Recovery Period Is Provided RemainingAmountsOfRegulatoryAssetsForWhichNoReturnOnInvestmentDuringRecoveryPeriodIsProvided	74583000	USD
CY2012	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	14000000	USD
CY2011	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	0	USD
CY2010	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	8000000	USD
CY2010	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	110242000	USD
CY2012	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	11492000	USD
CY2011	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	297000	USD
CY2012	us-gaap	Repayments Of Other Debt RepaymentsOfOtherDebt	13669000	USD
CY2011	us-gaap	Repayments Of Other Debt RepaymentsOfOtherDebt	12463000	USD
CY2010	us-gaap	Repayments Of Other Debt RepaymentsOfOtherDebt	11370000	USD
CY2011Q3	us-gaap	Revenues Revenues	343710000	USD
CY2012Q4	us-gaap	Revenues Revenues	410528000	USD
CY2011Q4	us-gaap	Revenues Revenues	438927000	USD
CY2012Q2	us-gaap	Revenues Revenues	343585000	USD
CY2011Q1	us-gaap	Revenues Revenues	476586000	USD
CY2011Q2	us-gaap	Revenues Revenues	360557000	USD
CY2012Q3	us-gaap	Revenues Revenues	340632000	USD
CY2011	us-gaap	Revenues Revenues	1619780000	USD
CY2010	us-gaap	Revenues Revenues	1558740000	USD
CY2012Q1	us-gaap	Revenues Revenues	452257000	USD
CY2012Q4	us-gaap	Secured Debt SecuredDebt	1336700000	USD
CY2011Q4	us-gaap	Secured Debt SecuredDebt	1263700000	USD
CY2012	us-gaap	Share Based Compensation ShareBasedCompensation	5792000	USD
CY2010	us-gaap	Share Based Compensation ShareBasedCompensation	4916000	USD
CY2011	us-gaap	Share Based Compensation ShareBasedCompensation	5756000	USD
CY2012Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	3000	shares
CY2012Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	12.41
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	1279000	USD
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	1349000	USD
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	1006000	USD
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	220650	shares
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	0	shares
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	1600	shares
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	0	shares
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	0	shares
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	0	shares
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	1393000	USD
CY2010Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	2217000	USD
CY2012Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	35000	USD
CY2010Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	201674	shares
CY2012Q4	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	77298000	USD
CY2011Q4	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	82950000	USD
CY2012Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On Fifth Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary	168530000	USD
CY2012Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On First Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary	306283000	USD
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	92499	shares
CY2012Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	3000	shares
CY2009Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	523973	shares
CY2012Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	12.41
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	10.69
CY2010Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	11.53
CY2010	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	11.51
CY2011	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	12.25
CY2012	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	10.63
CY2011	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	11.80
CY2010	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	22.60
CY2012	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	0.00
CY2012	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P0Y4M5D
CY2012Q4	us-gaap	Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Exercisable Options Weighted Average Exercise Price1 SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1	12.41
CY2010	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	101649	shares
CY2012	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	89499	shares
CY2011	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	107575	shares
CY2012Q4	us-gaap	Stockholders Equity StockholdersEquity	1277135000	USD
CY2011Q4	us-gaap	Stockholders Equity StockholdersEquity	1185875000	USD
CY2010Q4	us-gaap	Stockholders Equity StockholdersEquity	1125184000	USD
CY2011Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1185701000	USD
CY2012Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1259477000	USD
CY2012Q4	us-gaap	Tax Credit Carryforward Amount TaxCreditCarryforwardAmount	13900000	USD
CY2012Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On Fourth Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary	177883000	USD
CY2012Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On Second Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary	228470000	USD
CY2012Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On Third Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary	195742000	USD
CY2012Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance Sheet Amount UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount	2780891000	USD
CY2012Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Due After Five Years UnrecordedUnconditionalPurchaseObligationDueAfterFiveYears	1703983000	USD
CY2012	us-gaap	Use Of Estimates UseOfEstimates	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-top:12px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">Use of Estimates</font></div><div style="line-height:120%;padding-top:6px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The preparation of the consolidated financial statements in conformity with accounting principles generally accepted in the United States of America (U.S. GAAP) requires management to make estimates and assumptions that affect amounts reported in the consolidated financial statements. Significant estimates include:</font></div><table cellpadding="0" cellspacing="0" style="padding-top:8px;font-family:Times New Roman; font-size:10pt;"><tr><td style="width:96px;" rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td></tr><tr><td style="vertical-align:top" rowspan="1" colspan="1"><div style="line-height:120%;font-size:10pt;padding-left:48px;"><font style="font-family:inherit;font-size:10pt;">•</font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">determining the market value of energy commodity derivative assets and liabilities,</font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-top:8px;font-family:Times New Roman; font-size:10pt;"><tr><td style="width:96px;" rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td></tr><tr><td style="vertical-align:top" rowspan="1" colspan="1"><div style="line-height:120%;font-size:10pt;padding-left:48px;"><font style="font-family:inherit;font-size:10pt;">•</font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">pension and other postretirement benefit plan obligations,</font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-top:8px;font-family:Times New Roman; font-size:10pt;"><tr><td style="width:96px;" rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td></tr><tr><td style="vertical-align:top" rowspan="1" colspan="1"><div style="line-height:120%;font-size:10pt;padding-left:48px;"><font style="font-family:inherit;font-size:10pt;">•</font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">contingent liabilities,</font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-top:8px;font-family:Times New Roman; font-size:10pt;"><tr><td style="width:96px;" rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td></tr><tr><td style="vertical-align:top" rowspan="1" colspan="1"><div style="line-height:120%;font-size:10pt;padding-left:48px;"><font style="font-family:inherit;font-size:10pt;">•</font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">recoverability of regulatory assets, and</font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-top:8px;font-family:Times New Roman; font-size:10pt;"><tr><td style="width:96px;" rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td></tr><tr><td style="vertical-align:top" rowspan="1" colspan="1"><div style="line-height:120%;font-size:10pt;padding-left:48px;"><font style="font-family:inherit;font-size:10pt;">•</font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">unbilled revenues.</font></div></td></tr></table><div style="line-height:120%;padding-top:12px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Changes in these estimates and assumptions are considered reasonably possible and may have a material effect on the consolidated financial statements and thus actual results could differ from the amounts reported and disclosed herein.</font></div></div>
CY2011	us-gaap	Utilities Operating Expense Depreciation And Amortization UtilitiesOperatingExpenseDepreciationAndAmortization	105629000	USD
CY2010	us-gaap	Utilities Operating Expense Depreciation And Amortization UtilitiesOperatingExpenseDepreciationAndAmortization	100554000	USD
CY2012	us-gaap	Utilities Operating Expense Depreciation And Amortization UtilitiesOperatingExpenseDepreciationAndAmortization	112091000	USD
CY2012	us-gaap	Utilities Operating Expense Maintenance Operations And Other Costs And Expenses UtilitiesOperatingExpenseMaintenanceOperationsAndOtherCostsAndExpenses	276780000	USD
CY2011	us-gaap	Utilities Operating Expense Maintenance Operations And Other Costs And Expenses UtilitiesOperatingExpenseMaintenanceOperationsAndOtherCostsAndExpenses	261926000	USD
CY2010	us-gaap	Utilities Operating Expense Maintenance Operations And Other Costs And Expenses UtilitiesOperatingExpenseMaintenanceOperationsAndOtherCostsAndExpenses	252437000	USD
CY2011	us-gaap	Utilities Operating Expense Products And Services UtilitiesOperatingExpenseProductsAndServices	790048000	USD
CY2010	us-gaap	Utilities Operating Expense Products And Services UtilitiesOperatingExpenseProductsAndServices	795075000	USD
CY2012	us-gaap	Utilities Operating Expense Products And Services UtilitiesOperatingExpenseProductsAndServices	693127000	USD
CY2011	us-gaap	Utilities Operating Expense Taxes UtilitiesOperatingExpenseTaxes	83347000	USD
CY2010	us-gaap	Utilities Operating Expense Taxes UtilitiesOperatingExpenseTaxes	73382000	USD
CY2012	us-gaap	Utilities Operating Expense Taxes UtilitiesOperatingExpenseTaxes	83409000	USD
CY2011	us-gaap	Utility Revenue UtilityRevenue	1441522000	USD
CY2010	us-gaap	Utility Revenue UtilityRevenue	1417846000	USD
CY2012	us-gaap	Utility Revenue UtilityRevenue	1352385000	USD
CY2012	us-gaap	Valuation Allowances And Reserves Charged To Cost And Expense ValuationAllowancesAndReservesChargedToCostAndExpense	4213000	USD
CY2010	us-gaap	Valuation Allowances And Reserves Charged To Cost And Expense ValuationAllowancesAndReservesChargedToCostAndExpense	5194000	USD
CY2011	us-gaap	Valuation Allowances And Reserves Charged To Cost And Expense ValuationAllowancesAndReservesChargedToCostAndExpense	5232000	USD
CY2012	us-gaap	Valuation Allowances And Reserves Deductions ValuationAllowancesAndReservesDeductions	4016000	USD
CY2010	us-gaap	Valuation Allowances And Reserves Deductions ValuationAllowancesAndReservesDeductions	3239000	USD
CY2011	us-gaap	Valuation Allowances And Reserves Deductions ValuationAllowancesAndReservesDeductions	6157000	USD
CY2011	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	58092000	shares
CY2012	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	59201000	shares
CY2010	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	55824000	shares
CY2011Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	58232000	shares
CY2012Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	59123000	shares
CY2011Q4	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	58583000	shares
CY2011Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	57414000	shares
CY2012Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	58924000	shares
CY2012Q4	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	59826000	shares
CY2012Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	58950000	shares
CY2011Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	58143000	shares
CY2010	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	55595000	shares
CY2012	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	59028000	shares
CY2011	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	57872000	shares
CY2012Q4	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	59774000	shares
CY2011Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	57787000	shares
CY2011Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	57342000	shares
CY2012Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	58702000	shares
CY2012Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	58581000	shares
CY2011Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	58057000	shares
CY2012Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	59047000	shares
CY2011Q4	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	58304000	shares
CY2012Q4	ava	Accumulated Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Unamortized Gain Loss Tax AccumulatedOtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossTax	-3698000	USD
CY2011Q4	ava	Accumulated Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Unamortized Gain Loss Tax AccumulatedOtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossTax	-3107000	USD
CY2011Q4	ava	Accumulated Other Comprehensive Income Loss Unrealized Holding Gain Loss On Securities Tax AccumulatedOtherComprehensiveIncomeLossUnrealizedHoldingGainLossOnSecuritiesTax	79000	USD
CY2012Q4	ava	Accumulated Other Comprehensive Income Loss Unrealized Holding Gain Loss On Securities Tax AccumulatedOtherComprehensiveIncomeLossUnrealizedHoldingGainLossOnSecuritiesTax	99000	USD
CY2010	ava	Amortization Of Energy Contract AmortizationOfEnergyContract	8866000	USD
CY2012	ava	Amortization Of Energy Contract AmortizationOfEnergyContract	10492000	USD
CY2011	ava	Amortization Of Energy Contract AmortizationOfEnergyContract	9645000	USD
CY2012	ava	Amortization Of Transition Obligation Period AmortizationOfTransitionObligationPeriod	P20Y
CY1998Q4	ava	Amount Borrowed To Acquire Long Term Fixed Rate Electric Capacity Contract AmountBorrowedToAcquireLongTermFixedRateElectricCapacityContract	145000000	USD
CY2012Q4	ava	Available For Sale Securities And Funds Held For Clients Amortized Cost AvailableForSaleSecuritiesAndFundsHeldForClientsAmortizedCost	88008000	USD
CY2011Q4	ava	Available For Sale Securities And Funds Held For Clients Amortized Cost AvailableForSaleSecuritiesAndFundsHeldForClientsAmortizedCost	118325000	USD
CY2012Q4	ava	Available For Sale Securities And Funds Held For Clients Unrealized Gain Loss AvailableForSaleSecuritiesAndFundsHeldForClientsUnrealizedGainLoss	264000	USD
CY2011Q4	ava	Available For Sale Securities And Funds Held For Clients Unrealized Gain Loss AvailableForSaleSecuritiesAndFundsHeldForClientsUnrealizedGainLoss	211000	USD
CY2011	ava	Available For Sale Securities Debt Effective Maturity AvailableForSaleSecuritiesDebtEffectiveMaturity	P1Y3M18D
CY2012	ava	Available For Sale Securities Debt Effective Maturity AvailableForSaleSecuritiesDebtEffectiveMaturity	P1Y10M24D
CY2012Q2	ava	Base Rate Trigger Point Erm Modification BaseRateTriggerPointErmModification	30000000	USD
CY2012Q1	ava	Base Rate Trigger Point Erm Modification BaseRateTriggerPointErmModification	45000000	USD
CY2012Q1	ava	Base Rate Trigger Point Percentage Erm Modification BaseRateTriggerPointPercentageErmModification	0.10
CY2012Q4	ava	Cash And Cash Equivalents Amortized Cost CashAndCashEquivalentsAmortizedCost	13867000	USD
CY2012Q4	ava	Cash And Cash Equivalents Unrealized Gain Loss CashAndCashEquivalentsUnrealizedGainLoss	0	USD
CY2012Q4	ava	Client Fund Obligations ClientFundObligations	87839000	USD
CY2011Q4	ava	Client Fund Obligations ClientFundObligations	118325000	USD
CY2011	ava	Cost Of Services Depreciation And Amortization Subsidiaries CostOfServicesDepreciationAndAmortizationSubsidiaries	7193000	USD
CY2010	ava	Cost Of Services Depreciation And Amortization Subsidiaries CostOfServicesDepreciationAndAmortizationSubsidiaries	6070000	USD
CY2012	ava	Cost Of Services Depreciation And Amortization Subsidiaries CostOfServicesDepreciationAndAmortizationSubsidiaries	13519000	USD
CY2012Q4	ava	Current Regulatory Asset For Utility Derivatives CurrentRegulatoryAssetForUtilityDerivatives	35082000	USD
CY2011Q4	ava	Current Regulatory Asset For Utility Derivatives CurrentRegulatoryAssetForUtilityDerivatives	69685000	USD
CY2012	ava	Deadband Amount DeadbandAmount	4000000	USD
CY2011	ava	Decrease Increase In Money Market Funds Held For Clients DecreaseIncreaseInMoneyMarketFundsHeldForClients	-78561000	USD
CY2010	ava	Decrease Increase In Money Market Funds Held For Clients DecreaseIncreaseInMoneyMarketFundsHeldForClients	48895000	USD
CY2012	ava	Decrease Increase In Money Market Funds Held For Clients DecreaseIncreaseInMoneyMarketFundsHeldForClients	6811000	USD
CY2012Q4	ava	Deferred Income Tax Assets Power And Natural Gas Deferrals DeferredIncomeTaxAssetsPowerAndNaturalGasDeferrals	12490000	USD
CY2011Q4	ava	Deferred Income Tax Assets Power And Natural Gas Deferrals DeferredIncomeTaxAssetsPowerAndNaturalGasDeferrals	9545000	USD
CY2011Q4	ava	Deferred Tax Asset Affiliate DeferredTaxAssetAffiliate	0	USD
CY2012Q4	ava	Deferred Tax Asset Affiliate DeferredTaxAssetAffiliate	607000	USD
CY2012Q4	ava	Deferred Tax Liabilities Interest Rate Swaps DeferredTaxLiabilitiesInterestRateSwaps	12308000	USD
CY2011Q4	ava	Deferred Tax Liabilities Interest Rate Swaps DeferredTaxLiabilitiesInterestRateSwaps	3720000	USD
CY2012Q4	ava	Deferred Tax Liabilities Loss On Reacquired Debt DeferredTaxLiabilitiesLossOnReacquiredDebt	6751000	USD
CY2011Q4	ava	Deferred Tax Liabilities Loss On Reacquired Debt DeferredTaxLiabilitiesLossOnReacquiredDebt	7193000	USD
CY2012Q4	ava	Deferred Tax Liabilities Power Deferrals DeferredTaxLiabilitiesPowerDeferrals	10753000	USD
CY2011Q4	ava	Deferred Tax Liabilities Power Deferrals DeferredTaxLiabilitiesPowerDeferrals	15571000	USD
CY2012Q4	ava	Deferred Tax Liabilities Settlement With Specific External Party DeferredTaxLiabilitiesSettlementWithSpecificExternalParty	13448000	USD
CY2011Q4	ava	Deferred Tax Liabilities Settlement With Specific External Party DeferredTaxLiabilitiesSettlementWithSpecificExternalParty	19185000	USD
CY2012	ava	Depreciation And Amortization Expense DepreciationAndAmortizationExpense	126402000	USD
CY2010	ava	Depreciation And Amortization Expense DepreciationAndAmortizationExpense	107626000	USD
CY2011	ava	Depreciation And Amortization Expense DepreciationAndAmortizationExpense	113600000	USD
CY2012Q4	ava	Esttimated Annual Reduction To Customer Payments EsttimatedAnnualReductionToCustomerPayments	1400000	USD
CY2012Q4	ava	Fixed Charge Coverage Ratio FixedChargeCoverageRatio	1.50
CY2012Q4	ava	Funded Debt To Ebitda Ratio FundedDebtToEbitdaRatio	2.50
CY2011Q4	ava	Funds Held For Clients Including Securities Available For Sale FundsHeldForClientsIncludingSecuritiesAvailableForSale	96579000	USD
CY2012	ava	Increase Decrease In Client Fund Obligations IncreaseDecreaseInClientFundObligations	-30996000	USD
CY2011	ava	Increase Decrease In Client Fund Obligations IncreaseDecreaseInClientFundObligations	17782000	USD
CY2010	ava	Increase Decrease In Client Fund Obligations IncreaseDecreaseInClientFundObligations	48895000	USD
CY2012Q4	ava	Operation And Maintenance Charges OperationAndMaintenanceCharges	40.87
CY2012Q4	ava	Funds Held For Clients Including Securities Available For Sale FundsHeldForClientsIncludingSecuritiesAvailableForSale	59321000	USD
CY2012Q4	ava	Funds Held For Customers Including Securities Available For Sale FundsHeldForCustomersIncludingSecuritiesAvailableForSale	88272000	USD
CY2011Q4	ava	Funds Held For Customers Including Securities Available For Sale FundsHeldForCustomersIncludingSecuritiesAvailableForSale	118536000	USD
CY2011	ava	Grant Proceeds From Outside Parties GrantProceedsFromOutsideParties	-16928000	USD
CY2010	ava	Grant Proceeds From Outside Parties GrantProceedsFromOutsideParties	-7585000	USD
CY2012	ava	Grant Proceeds From Outside Parties GrantProceedsFromOutsideParties	-8277000	USD
CY2010	ava	Interest Expense Including Affiliated Trusts InterestExpenseIncludingAffiliatedTrusts	76424000	USD
CY2011	ava	Interest Expense Including Affiliated Trusts InterestExpenseIncludingAffiliatedTrusts	74208000	USD
CY2012	ava	Interest Expense Including Affiliated Trusts InterestExpenseIncludingAffiliatedTrusts	77435000	USD
CY2011	ava	Interest On Regulatory Deferrals InterestOnRegulatoryDeferrals	89000	USD
CY2012	ava	Interest On Regulatory Deferrals InterestOnRegulatoryDeferrals	68000	USD
CY2010	ava	Interest On Regulatory Deferrals InterestOnRegulatoryDeferrals	248000	USD
CY2004Q2	ava	Investigation Reviewing InvestigationReviewing	250	USD
CY2010	ava	Other Amortization OtherAmortization	2450000	USD
CY2011	ava	Other Amortization OtherAmortization	2450000	USD
CY2012	ava	Other Amortization OtherAmortization	2450000	USD
CY2010	ava	Other Cost And Expenses Operating Subsidiaries OtherCostAndExpensesOperatingSubsidiaries	80100000	USD
CY2012	ava	Investment Portfolio Percentage Rated Aa Or Higher InvestmentPortfolioPercentageRatedAaOrHigher	0.97
CY2011	ava	Investment Portfolio Percentage Rated Aa Or Higher InvestmentPortfolioPercentageRatedAaOrHigher	0.88
CY2012	ava	Long Term Contract For Purchase Of Electric Power Kilowatt Capability LongTermContractForPurchaseOfElectricPowerKilowattCapability	89848	kWh
CY2011Q4	ava	Long Term Debt Before Current Portion And Bonds Held By Company LongTermDebtBeforeCurrentPortionAndBondsHeldByCompany	1261000000	USD
CY2012Q4	ava	Long Term Debt Before Current Portion And Bonds Held By Company LongTermDebtBeforeCurrentPortionAndBondsHeldByCompany	1312439000	USD
CY2012	ava	Majority Of Bargaining Unit Employees Percentage MajorityOfBargainingUnitEmployeesPercentage	0.9000
CY2012Q4	ava	Money Market Funds Amortized Cost MoneyMarketFundsAmortizedCost	15084000	USD
CY2011Q4	ava	Money Market Funds Amortized Cost MoneyMarketFundsAmortizedCost	21957000	USD
CY2011	ava	Other Cost And Expenses Operating Subsidiaries OtherCostAndExpensesOperatingSubsidiaries	109738000	USD
CY2012	ava	Other Cost And Expenses Operating Subsidiaries OtherCostAndExpensesOperatingSubsidiaries	139173000	USD
CY2012Q4	ava	Money Market Funds Unrealized Gain Loss MoneyMarketFundsUnrealizedGainLoss	0	USD
CY2011Q4	ava	Money Market Funds Unrealized Gain Loss MoneyMarketFundsUnrealizedGainLoss	0	USD
CY2012	ava	Natural Gas Cost Deferrals And Recovery Percentage NaturalGasCostDeferralsAndRecoveryPercentage	1.00
CY2012	ava	Natural Gas Cost Deferrals And Recovery Percentage Recovered NaturalGasCostDeferralsAndRecoveryPercentageRecovered	0.90
CY2012	ava	Noncash Change In Redeemable Noncontrolling Interests NoncashChangeInRedeemableNoncontrollingInterests	-10104000	USD
CY2010	ava	Noncash Change In Redeemable Noncontrolling Interests NoncashChangeInRedeemableNoncontrollingInterests	10442000	USD
CY2011	ava	Noncash Change In Redeemable Noncontrolling Interests NoncashChangeInRedeemableNoncontrollingInterests	4059000	USD
CY2011Q4	ava	Noncurrent Regulatory Asset For Utility Derivatives NoncurrentRegulatoryAssetForUtilityDerivatives	40345000	USD
CY2012Q4	ava	Noncurrent Regulatory Asset For Utility Derivatives NoncurrentRegulatoryAssetForUtilityDerivatives	25218000	USD
CY2012	ava	Number Of Collective Bargaining Agreements NumberOfCollectiveBargainingAgreements	2	agreement
CY2012	ava	Number Of Days Canadian Currency Prices Are Settled With Us Dollars NumberOfDaysCanadianCurrencyPricesAreSettledWithUSDollars	P60D
CY2012	ava	Number Of Employees Covering Two Agreements NumberOfEmployeesCoveringTwoAgreements	50	employee
CY2007Q1	ava	Number Of Families That Own Property Near Holding Ponds Who Filed Complaint NumberOfFamiliesThatOwnPropertyNearHoldingPondsWhoFiledComplaint	2	family
CY2012	ava	Number Of Hydroelectric Plants NumberOfHydroelectricPlants	6	hydroelectric_plant
CY2012Q3	ava	Number Of Sales Agency Agreements NumberOfSalesAgencyAgreements	2	agreement
CY2012	ava	Number Of Years License Issued NumberOfYearsLicenseIssued	P50Y
CY2012Q4	ava	Other Long Term Debt And Capital Lease Obligations OtherLongTermDebtAndCapitalLeaseObligations	5092000	USD
CY2011Q4	ava	Other Long Term Debt And Capital Lease Obligations OtherLongTermDebtAndCapitalLeaseObligations	5455000	USD
CY2012	ava	Other Operating Expenses OtherOperatingExpenses	453994000	USD
CY2011	ava	Other Operating Expenses OtherOperatingExpenses	404781000	USD
CY2010	ava	Other Operating Expenses OtherOperatingExpenses	362923000	USD
CY2012	ava	Payment For Settlement Of Interest Rate Swap PaymentForSettlementOfInterestRateSwap	18547000	USD
CY2011	ava	Payment For Settlement Of Interest Rate Swap PaymentForSettlementOfInterestRateSwap	10557000	USD
CY2010	ava	Payment For Settlement Of Interest Rate Swap PaymentForSettlementOfInterestRateSwap	0	USD
CY2012	ava	Pending Regulatory Treatment Liability PendingRegulatoryTreatmentLiability	21488000	USD
CY2012	ava	Percentage Of Employees Collective Bargaining Agreement PercentageOfEmployeesCollectiveBargainingAgreement	0.4500
CY2012	ava	Power Supply Cost Benefit Variance Percentage PowerSupplyCostBenefitVariancePercentage	1.00
CY2011	ava	Revenue From Subsidiaries RevenueFromSubsidiaries	137848000	USD
CY2012Q4	ava	Property Plant And Equipment Total PropertyPlantAndEquipmentTotal	4250570000	USD
CY2011Q4	ava	Property Plant And Equipment Total PropertyPlantAndEquipmentTotal	4014511000	USD
CY2011Q1	ava	Purchase Of Shares Held By Subsidiaries PurchaseOfSharesHeldBySubsidiaries	5600000	USD
CY2011Q4	ava	Receivables Long Term Contracts Or Programs Noncurrent ReceivablesLongTermContractsOrProgramsNoncurrent	62525000	USD
CY2012Q4	ava	Receivables Long Term Contracts Or Programs Noncurrent ReceivablesLongTermContractsOrProgramsNoncurrent	52033000	USD
CY2012Q4	ava	Receiving Power Period Of Time Years ReceivingPowerPeriodOfTimeYears	32.5	years
CY2012Q4	ava	Regulatory Asset Earning Return RegulatoryAssetEarningReturn	180962000	USD
CY2011Q4	ava	Regulatory Assets For Pensions And Other Postretirement Benefits Noncurrent RegulatoryAssetsForPensionsAndOtherPostretirementBenefitsNoncurrent	260359000	USD
CY2012Q4	ava	Regulatory Assets For Pensions And Other Postretirement Benefits Noncurrent RegulatoryAssetsForPensionsAndOtherPostretirementBenefitsNoncurrent	306408000	USD
CY2012Q4	ava	Regulatory Liability Earning Return RegulatoryLiabilityEarningReturn	271086000	USD
CY2012Q4	ava	Regulatory Liability For Utility Plant Retirement Costs Noncurrent RegulatoryLiabilityForUtilityPlantRetirementCostsNoncurrent	234128000	USD
CY2011Q4	ava	Regulatory Liability For Utility Plant Retirement Costs Noncurrent RegulatoryLiabilityForUtilityPlantRetirementCostsNoncurrent	227282000	USD
CY2012Q4	ava	Remaining Amounts Of Regulatory Liabilities For Which No Interest During Recovery Period Is Provided RemainingAmountsOfRegulatoryLiabilitiesForWhichNoInterestDuringRecoveryPeriodIsProvided	26069000	USD
CY2012	ava	Revenue From Subsidiaries RevenueFromSubsidiaries	155664000	USD
CY2010	ava	Revenue From Subsidiaries RevenueFromSubsidiaries	102035000	USD
CY2012Q4	ava	Revenue Receivable Recoverable From Rate Case Change RevenueReceivableRecoverableFromRateCaseChange	500000	USD
CY2010	ava	Stock Options StockOptions	72000	shares
CY2012	ava	Stock Options StockOptions	11000	shares
CY2012Q4	ava	Settled Interest Rate Swaps SettledInterestRateSwaps	27900000	USD
CY2011Q4	ava	Settled Interest Rate Swaps SettledInterestRateSwaps	10629000	USD
CY2011	ava	Stock Options StockOptions	48000	shares
CY2011	ava	Tax Effect Of Regulatory Treatment Of Utility Plant Differences TaxEffectOfRegulatoryTreatmentOfUtilityPlantDifferences	1798000	USD
CY2012	ava	Tax Effect Of Regulatory Treatment Of Utility Plant Differences TaxEffectOfRegulatoryTreatmentOfUtilityPlantDifferences	2432000	USD
CY2010	ava	Tax Effect Of Regulatory Treatment Of Utility Plant Differences TaxEffectOfRegulatoryTreatmentOfUtilityPlantDifferences	2761000	USD
CY2012	ava	Utility Power Resources UtilityPowerResources	523416000	USD
CY2010	ava	Utility Power Resources UtilityPowerResources	649408000	USD
CY2011	ava	Utility Power Resources UtilityPowerResources	557619000	USD
CY2012	dei	Amendment Flag AmendmentFlag	false
CY2012	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2012	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2012	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2012
CY2012	dei	Document Period End Date DocumentPeriodEndDate	2012-12-31
CY2012	dei	Document Type DocumentType	10-K
CY2012	dei	Entity Central Index Key EntityCentralIndexKey	0000104918
CY2013Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	59851338	shares
CY2012	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2012	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2012Q2	dei	Entity Public Float EntityPublicFloat	1568836865	USD
CY2012	dei	Entity Registrant Name EntityRegistrantName	AVISTA CORP
CY2012	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2012	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2012	dei	Trading Symbol TradingSymbol	ava

Files In Submission

Name	View Source	Status
0000104918-13-000042-index-headers.html	Edgar Link	pending
0000104918-13-000042-index.html	Edgar Link	pending
0000104918-13-000042.txt	Edgar Link	pending
0000104918-13-000042-xbrl.zip	Edgar Link	pending
ava-20121231.xml	Edgar Link	completed
ava-20121231.xsd	Edgar Link	pending
ava-20121231x10k.htm	Edgar Link	pending
ava-20121231xex1025.htm	Edgar Link	pending
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ava-20121231_cal.xml	Edgar Link	unprocessable
ava-20121231_def.xml	Edgar Link	unprocessable
ava-20121231_lab.xml	Edgar Link	unprocessable
ava-20121231_pre.xml	Edgar Link	unprocessable
ava-2012x1231xex32.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xls	Edgar Link	pending
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$AVA
AVISTA CORP Stock $ava

2011 Q4 Form 10-K Financial Statement

#000010491813000042 Filed on February 26, 2013

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$AVA AVISTA CORP Stock $ava

2011 Q4 Form 10-K Financial Statement

#000010491813000042 Filed on February 26, 2013

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$AVA
AVISTA CORP Stock $ava