$IDA
IDACORP INC Stock $ida

$ida Overview Financials Valuation SEC Filings Company Website

2017 Q4 Form 10-Q Financial Statement

#000105787717000132 Filed on November 02, 2017

Income Statement

Concept	2017 Q4	2017 Q3	2016 Q3
Revenue	$305.6M	$408.3M	$372.0M
YoY Change	4.09%	9.75%	0.78%
Cost Of Revenue	$62.60M	$76.60M	$75.20M
YoY Change	-16.42%	1.86%	6.06%
Gross Profit	$243.0M	$331.7M	$296.8M
YoY Change	11.11%	11.76%	-0.5%
Gross Profit Margin	79.52%	81.23%	79.78%
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$40.80M	$41.20M	$37.00M
YoY Change	9.97%	11.35%	3.35%
% of Gross Profit	16.79%	12.42%	12.47%
Operating Expenses	$185.8M	$284.6M	$274.1M
YoY Change	20.1%	3.83%	3.64%
Operating Profit	$57.20M	$123.7M	$97.93M
YoY Change	-10.63%	26.32%	-6.44%
Interest Expense	-$20.00M	$20.74M	$20.31M
YoY Change	-12.66%	2.12%	0.17%
% of Operating Profit	-34.97%	16.77%	20.74%
Other Income/Expense, Net	$5.100M	-$537.0K	$2.681M
YoY Change	-2650.0%	-120.03%	119.39%
Pretax Income	$42.30M	$113.4M	$98.55M
YoY Change	3.17%	15.04%	1.82%
Income Tax	$1.600M	$22.30M	$15.54M
% Of Pretax Income	3.78%	19.67%	15.76%
Net Earnings	$38.90M	$90.63M	$83.10M
YoY Change	17.17%	9.07%	13.31%
Net Earnings / Revenue	12.73%	22.2%	22.34%
Basic Earnings Per Share		$1.80	$1.65
Diluted Earnings Per Share	$770.3K	$1.80	$1.65
COMMON SHARES
Basic Shares Outstanding	50.39M shares	50.36M shares	50.30M shares
Diluted Shares Outstanding		50.42M shares	50.39M shares

Balance Sheet

Concept	2017 Q4	2017 Q3	2016 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$76.60M	$104.4M	$100.8M
YoY Change	24.55%	3.57%	-16.9%
Cash & Equivalents	$76.65M	$104.4M	$100.8M
Short-Term Investments
Other Short-Term Assets	$18.00K	$101.0K	$2.997M
YoY Change	-99.7%	-96.63%	630.98%
Inventory	$112.4M	$112.6M	$118.9M
Prepaid Expenses	$16.98M	$16.48M	$15.60M
Receivables	$75.25M	$101.7M	$86.22M
Other Receivables	$38.60M	$10.10M	$21.10M
Total Short-Term Assets	$443.6M	$457.9M	$459.9M
YoY Change	0.75%	-0.43%	-6.97%
LONG-TERM ASSETS
Property, Plant & Equipment	$4.284B	$4.241B	$4.095B
YoY Change	2.68%	3.55%	2.94%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments	$11.35M	$112.0M	$131.2M
YoY Change	1.18%	-14.63%	-18.05%
Other Assets	$59.43M	$51.29M	$53.56M
YoY Change	-4.24%	-4.22%	-5.62%
Total Long-Term Assets	$5.602B	$5.909B	$5.669B
YoY Change	-4.24%	4.23%	4.14%
TOTAL ASSETS
Total Short-Term Assets	$443.6M	$457.9M	$459.9M
Total Long-Term Assets	$5.602B	$5.909B	$5.669B
Total Assets	$6.045B	$6.367B	$6.129B
YoY Change	-3.89%	3.88%	3.22%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$90.28M	$72.15M	$77.90M
YoY Change	-14.99%	-7.37%	-3.89%
Accrued Expenses	$69.40M	$61.30M	$60.80M
YoY Change	1.76%	0.82%	-2.72%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$2.425M	$5.400M
YoY Change	-100.0%	-55.09%	50.0%
Long-Term Debt Due	$0.00	$0.00	$1.064M
YoY Change	-100.0%	-100.0%	0.0%
Total Short-Term Liabilities	$200.7M	$225.8M	$205.3M
YoY Change	-19.61%	9.99%	-0.02%
LONG-TERM LIABILITIES
Long-Term Debt	$1.746B	$1.746B	$1.746B
YoY Change	0.09%	0.01%	0.21%
Other Long-Term Liabilities	$44.57M	$44.65M	$45.41M
YoY Change	-1.15%	-1.68%	-7.53%
Total Long-Term Liabilities	$1.842B	$2.143B	$2.026B
YoY Change	-13.81%	5.82%	4.59%
TOTAL LIABILITIES
Total Short-Term Liabilities	$200.7M	$225.8M	$205.3M
Total Long-Term Liabilities	$1.842B	$2.143B	$2.026B
Total Liabilities	$2.043B	$2.369B	$2.231B
YoY Change	-14.42%	6.2%	4.15%
SHAREHOLDERS EQUITY
Retained Earnings	$1.427B	$1.413B	$1.318B
YoY Change	7.81%	7.26%	7.66%
Common Stock	$857.2M	$855.0M	$850.7M
YoY Change	0.63%	0.51%	0.32%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$1.386M	$1.368M	$201.0K
YoY Change	470.37%	580.6%	252.63%
Treasury Stock Shares	27.66K shares	26.98K shares	18.25K shares
Shareholders Equity	$2.251B	$2.248B	$2.149B
YoY Change
Total Liabilities & Shareholders Equity	$6.045B	$6.367B	$6.129B
YoY Change	-3.89%	3.88%	3.22%

Cashflow Statement

Concept	2017 Q4	2017 Q3	2016 Q3
OPERATING ACTIVITIES
Net Income	$38.90M	$90.63M	$83.10M
YoY Change	17.17%	9.07%	13.31%
Depreciation, Depletion And Amortization	$40.80M	$41.20M	$37.00M
YoY Change	9.97%	11.35%	3.35%
Cash From Operating Activities	$89.20M	$157.0M	$137.5M
YoY Change	29.65%	14.18%	14.77%
INVESTING ACTIVITIES
Capital Expenditures	-$78.20M	-$61.00M	-$82.80M
YoY Change	-19.38%	-26.33%	-0.12%
Acquisitions
YoY Change
Other Investing Activities	-$6.400M	$1.700M	-$300.0K
YoY Change	-1166.67%	-666.67%	-142.86%
Cash From Investing Activities	-$84.40M	-$59.40M	-$83.00M
YoY Change	-12.45%	-28.43%	0.85%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-32.50M	-25.80M	-44.20M
YoY Change	177.78%	-41.63%	-6.55%
NET CHANGE
Cash From Operating Activities	89.20M	157.0M	137.5M
Cash From Investing Activities	-84.40M	-59.40M	-83.00M
Cash From Financing Activities	-32.50M	-25.80M	-44.20M
Net Change In Cash	-27.70M	71.80M	10.30M
YoY Change	-29.52%	597.09%	-205.1%
FREE CASH FLOW
Cash From Operating Activities	$89.20M	$157.0M	$137.5M
Capital Expenditures	-$78.20M	-$61.00M	-$82.80M
Free Cash Flow	$167.4M	$218.0M	$220.3M
YoY Change	0.97%	-1.04%	8.68%

Facts In Submission

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	dei	Amendment Flag AmendmentFlag	false
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q3
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2017
	dei	Document Period End Date DocumentPeriodEndDate	2017-09-30
	dei	Document Type DocumentType	10-Q
	dei	Entity Central Index Key EntityCentralIndexKey	0001057877
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	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
	dei	Entity Registrant Name EntityRegistrantName	IDACORP INC.
	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	820505802
	dei	Trading Symbol TradingSymbol	IDA
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	ida	Effective Income Tax Rate Reconciliation Share Based Compensation EffectiveIncomeTaxRateReconciliationShareBasedCompensation	1587000	USD
CY2016Q3	ida	Energy Efficiency Programs EnergyEfficiencyPrograms	9102000	USD
	ida	Energy Efficiency Programs EnergyEfficiencyPrograms	24256000	USD
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	ida	Energy Efficiency Programs EnergyEfficiencyPrograms	26726000	USD
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CY2016Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	15535000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	28622000	USD
CY2017Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	22296000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	45420000	USD
	us-gaap	Income Tax Reconciliation Deductions IncomeTaxReconciliationDeductions	5583000	USD
	us-gaap	Income Tax Reconciliation Deductions IncomeTaxReconciliationDeductions	0	USD
	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	75736000	USD
	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	85624000	USD
	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-38277000	USD
	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-38617000	USD
	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	1500000	USD
	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	0	USD
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	2187000	USD
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	1702000	USD
CY2016Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	12781000	USD
CY2017Q3	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	4648000	USD
	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-10033000	USD
	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-32494000	USD
	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	12435000	USD
	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	20520000	USD
	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	8490000	USD
	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	54687000	USD
	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	-7343000	USD
	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	-18736000	USD
	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	-5451000	USD
	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	-3010000	USD
	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	1277000	USD
	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	5357000	USD
	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	595000	USD
	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-494000	USD
	us-gaap	Increase Decrease In Regulatory Assets And Liabilities IncreaseDecreaseInRegulatoryAssetsAndLiabilities	-13502000	USD
	us-gaap	Increase Decrease In Regulatory Assets And Liabilities IncreaseDecreaseInRegulatoryAssetsAndLiabilities	-61968000	USD
CY2016Q3	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	97000	shares
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	62000	shares
CY2017Q3	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	59000	shares
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	47000	shares
CY2016Q3	us-gaap	Interest Costs Capitalized Adjustment InterestCostsCapitalizedAdjustment	2589000	USD
	us-gaap	Interest Costs Capitalized Adjustment InterestCostsCapitalizedAdjustment	7226000	USD
CY2017Q3	us-gaap	Interest Costs Capitalized Adjustment InterestCostsCapitalizedAdjustment	2385000	USD
	us-gaap	Interest Costs Capitalized Adjustment InterestCostsCapitalizedAdjustment	7106000	USD
CY2016Q3	us-gaap	Interest Expense InterestExpense	20312000	USD
	us-gaap	Interest Expense InterestExpense	62020000	USD
CY2017Q3	us-gaap	Interest Expense InterestExpense	20742000	USD
	us-gaap	Interest Expense InterestExpense	62089000	USD
CY2016Q3	us-gaap	Interest Expense Debt InterestExpenseDebt	20296000	USD
	us-gaap	Interest Expense Debt InterestExpenseDebt	61659000	USD
CY2017Q3	us-gaap	Interest Expense Debt InterestExpenseDebt	20300000	USD
	us-gaap	Interest Expense Debt InterestExpenseDebt	60897000	USD
CY2016Q3	us-gaap	Interest Expense Other InterestExpenseOther	2605000	USD
	us-gaap	Interest Expense Other InterestExpenseOther	7587000	USD
CY2017Q3	us-gaap	Interest Expense Other InterestExpenseOther	2827000	USD
	us-gaap	Interest Paid Net InterestPaidNet	60224000	USD
	us-gaap	Interest Paid Net InterestPaidNet	60257000	USD
CY2016Q4	us-gaap	Interest Payable Current InterestPayableCurrent	22377000	USD
CY2017Q3	us-gaap	Interest Payable Current InterestPayableCurrent	21406000	USD
CY2016Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	6289897000	USD
CY2017Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	6367183000	USD
CY2016Q4	us-gaap	Liabilities Current LiabilitiesCurrent	249715000	USD
CY2017Q3	us-gaap	Liabilities Current LiabilitiesCurrent	225792000	USD
CY2016Q4	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	2137702000	USD
CY2017Q3	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	2143483000	USD
CY2016Q4	us-gaap	Life Insurance Corporate Or Bank Owned Amount LifeInsuranceCorporateOrBankOwnedAmount	57553000	USD
CY2017Q3	us-gaap	Life Insurance Corporate Or Bank Owned Amount LifeInsuranceCorporateOrBankOwnedAmount	58973000	USD
CY2016Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	1064000	USD
CY2017Q3	us-gaap	Long Term Debt Current LongTermDebtCurrent	0	USD
CY2016Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	1744614000	USD
CY2017Q3	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	1745746000	USD
CY2016Q4	us-gaap	Long Term Investments LongTermInvestments	125164000	USD
CY2017Q3	us-gaap	Long Term Investments LongTermInvestments	111952000	USD
CY2015Q4	us-gaap	Minority Interest MinorityInterest	4160000	USD
CY2016Q3	us-gaap	Minority Interest MinorityInterest	4019000	USD
CY2016Q4	us-gaap	Minority Interest MinorityInterest	3960000	USD
CY2017Q3	us-gaap	Minority Interest MinorityInterest	4570000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-91880000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-107069000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-197543000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-198824000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	275417000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	348824000	USD
CY2016Q3	us-gaap	Net Income Loss NetIncomeLoss	83100000	USD
	us-gaap	Net Income Loss NetIncomeLoss	165075000	USD
CY2017Q3	us-gaap	Net Income Loss NetIncomeLoss	90634000	USD
	us-gaap	Net Income Loss NetIncomeLoss	173567000	USD
CY2016Q3	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-83000	USD
	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-141000	USD
CY2017Q3	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	442000	USD
	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	610000	USD
CY2016Q4	us-gaap	Notes Payable Current NotesPayableCurrent	21800000	USD
CY2017Q3	us-gaap	Notes Payable Current NotesPayableCurrent	2425000	USD
CY2016Q3	us-gaap	Operating Expenses OperatingExpenses	274117000	USD
CY2016Q3	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	362000	USD
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	1085000	USD
	us-gaap	Operating Expenses OperatingExpenses	749738000	USD
CY2017Q3	us-gaap	Operating Expenses OperatingExpenses	287410000	USD
	us-gaap	Operating Expenses OperatingExpenses	793036000	USD
CY2016Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	97928000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	218699000	USD
CY2017Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	120914000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	250838000	USD
CY2016Q4	us-gaap	Other Assets Current OtherAssetsCurrent	5961000	USD
CY2017Q3	us-gaap	Other Assets Current OtherAssetsCurrent	101000	USD
CY2016Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	52571000	USD
CY2017Q3	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	51293000	USD
CY2016Q3	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Before Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax	42000	USD
	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Before Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax	126000	USD
CY2017Q3	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Before Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax	31000	USD
	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Before Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax	95000	USD
CY2016Q3	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-563000	USD
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-1690000	USD
CY2017Q3	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-471000	USD
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-1412000	USD
CY2017Q3	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	302000	USD
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	906000	USD
CY2016Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax	925000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax	2775000	USD
CY2017Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax	773000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax	2318000	USD
CY2016Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	-883000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	-2649000	USD
CY2017Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	-742000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	-2223000	USD
CY2016Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax	563000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax	1690000	USD
CY2017Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax	471000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax	1412000	USD
CY2016Q3	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	-362000	USD
	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	-1085000	USD
CY2017Q3	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	-302000	USD
	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	-906000	USD
CY2016Q3	us-gaap	Other General Expense OtherGeneralExpense	3571000	USD
	us-gaap	Other General Expense OtherGeneralExpense	10748000	USD
CY2017Q3	us-gaap	Other General Expense OtherGeneralExpense	3296000	USD
	us-gaap	Other General Expense OtherGeneralExpense	9789000	USD
CY2016Q4	us-gaap	Other Inventory Supplies OtherInventorySupplies	57858000	USD
CY2017Q3	us-gaap	Other Inventory Supplies OtherInventorySupplies	58472000	USD
CY2016Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	9763000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	3189000	USD
	us-gaap	Payments Of Debt Extinguishment Costs PaymentsOfDebtExtinguishmentCosts	0	USD
CY2017Q3	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	9100000	USD
CY2016Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	45084000	USD
CY2017Q3	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	44651000	USD
	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-3876000	USD
	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-5220000	USD
CY2016Q3	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	2681000	USD
	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	7074000	USD
CY2017Q3	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	2256000	USD
	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	7024000	USD
CY2016Q4	us-gaap	Other Receivables OtherReceivables	15280000	USD
CY2017Q3	us-gaap	Other Receivables OtherReceivables	5399000	USD
CY2016Q3	us-gaap	Other Sales Revenue Net OtherSalesRevenueNet	571000	USD
	us-gaap	Other Sales Revenue Net OtherSalesRevenueNet	1986000	USD
CY2017Q3	us-gaap	Other Sales Revenue Net OtherSalesRevenueNet	1669000	USD
	us-gaap	Other Sales Revenue Net OtherSalesRevenueNet	3487000	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	9000	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-183000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	3287000	USD
	us-gaap	Payments Of Debt Extinguishment Costs PaymentsOfDebtExtinguishmentCosts	13895000	USD
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	77350000	USD
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	83441000	USD
	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	9843000	USD
	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	3248000	USD
	us-gaap	Payments To Acquire Life Insurance Policies PaymentsToAcquireLifeInsurancePolicies	10000000	USD
	us-gaap	Payments To Acquire Life Insurance Policies PaymentsToAcquireLifeInsurancePolicies	0	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	199966000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	207340000	USD
	us-gaap	Pension And Other Postretirement Benefit Contributions PensionAndOtherPostretirementBenefitContributions	43851000	USD
	us-gaap	Pension And Other Postretirement Benefit Contributions PensionAndOtherPostretirementBenefitContributions	45158000	USD
	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	22175000	USD
	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	21687000	USD
CY2016Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	411523000	USD
CY2017Q3	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	391579000	USD
CY2016Q4	us-gaap	Plant Held For Future Use Amount PlantHeldForFutureUseAmount	7441000	USD
CY2017Q3	us-gaap	Plant Held For Future Use Amount PlantHeldForFutureUseAmount	7511000	USD
CY2016Q4	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	18389000	USD
CY2017Q3	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	16477000	USD
	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	120000000	USD
	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	0	USD
	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-1684000	USD
	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	0	USD
	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-14600000	USD
	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-19375000	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities Equity ProceedsFromSaleOfAvailableForSaleSecuritiesEquity	14453000	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities Equity ProceedsFromSaleOfAvailableForSaleSecuritiesEquity	3755000	USD
	us-gaap	Proceeds From Sale Of Intangible Assets ProceedsFromSaleOfIntangibleAssets	969000	USD
	us-gaap	Proceeds From Sale Of Intangible Assets ProceedsFromSaleOfIntangibleAssets	1892000	USD
	us-gaap	Profit Loss ProfitLoss	164934000	USD
	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	6853000	USD
	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	5934000	USD
CY2016Q3	us-gaap	Profit Loss ProfitLoss	83017000	USD
CY2016Q4	us-gaap	Public Utilities Property Plant And Equipment Accumulated Depreciation PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation	1988477000	USD
CY2017Q3	us-gaap	Public Utilities Property Plant And Equipment Accumulated Depreciation PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation	2086119000	USD
	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	16555000	USD
CY2017Q3	us-gaap	Profit Loss ProfitLoss	91076000	USD
	us-gaap	Profit Loss ProfitLoss	174177000	USD
CY2016Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	4171999000	USD
CY2017Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	4240943000	USD
CY2016Q4	us-gaap	Property Plant And Equipment Other Net PropertyPlantAndEquipmentOtherNet	15922000	USD
CY2017Q3	us-gaap	Property Plant And Equipment Other Net PropertyPlantAndEquipmentOtherNet	15597000	USD
	us-gaap	Public Utilities Allowance For Funds Used During Construction Additions PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions	16153000	USD
	us-gaap	Public Utilities Allowance For Funds Used During Construction Additions PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions	16555000	USD
CY2016Q3	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	5931000	USD
	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	16153000	USD
CY2017Q3	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	5712000	USD
CY2016Q4	us-gaap	Public Utilities Property Plant And Equipment Construction Work In Progress PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress	405069000	USD
CY2017Q3	us-gaap	Public Utilities Property Plant And Equipment Construction Work In Progress PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress	463106000	USD
CY2016Q4	us-gaap	Public Utilities Property Plant And Equipment Net PublicUtilitiesPropertyPlantAndEquipmentNet	3743567000	USD
CY2017Q3	us-gaap	Public Utilities Property Plant And Equipment Net PublicUtilitiesPropertyPlantAndEquipmentNet	3754729000	USD
CY2016Q4	us-gaap	Public Utilities Property Plant And Equipment Plant In Service PublicUtilitiesPropertyPlantAndEquipmentPlantInService	5732044000	USD
CY2017Q3	us-gaap	Public Utilities Property Plant And Equipment Plant In Service PublicUtilitiesPropertyPlantAndEquipmentPlantInService	5840848000	USD
CY2016Q3	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-563000	USD
	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-1690000	USD
CY2017Q3	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-471000	USD
	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-1412000	USD
CY2016Q3	us-gaap	Regulated Operating Revenue Other RegulatedOperatingRevenueOther	23506000	USD
	us-gaap	Regulated Operating Revenue Other RegulatedOperatingRevenueOther	64433000	USD
CY2017Q3	us-gaap	Regulated Operating Revenue Other RegulatedOperatingRevenueOther	26376000	USD
	us-gaap	Regulated Operating Revenue Other RegulatedOperatingRevenueOther	75976000	USD
CY2016Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	62570000	USD
CY2017Q3	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	52927000	USD
CY2016Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	1409329000	USD
CY2017Q3	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	1412086000	USD
CY2016Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	9944000	USD
CY2017Q3	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	2296000	USD
CY2016Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	436845000	USD
CY2017Q3	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	466162000	USD
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	101064000	USD
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	1064000	USD
CY2015Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	1230105000	USD
CY2016Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	1317732000	USD
CY2016Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	1323198000	USD
CY2017Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	1413387000	USD
CY2016Q3	us-gaap	Sales Revenue Net SalesRevenueNet	372045000	USD
	us-gaap	Sales Revenue Net SalesRevenueNet	968437000	USD
	us-gaap	Stockholders Equity Other StockholdersEquityOther	3210000	USD
CY2016Q3	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	8287000	USD
	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	25228000	USD
CY2017Q3	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	8614000	USD
	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	26134000	USD
CY2016Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	11348000	USD
CY2017Q3	us-gaap	Short Term Debt Weighted Average Interest Rate ShortTermDebtWeightedAverageInterestRate	0.0154
	us-gaap	Stock Issued During Period Value Treasury Stock Reissued StockIssuedDuringPeriodValueTreasuryStockReissued	3143000	USD
	us-gaap	Stock Issued During Period Value Treasury Stock Reissued StockIssuedDuringPeriodValueTreasuryStockReissued	2063000	USD
CY2016Q3	us-gaap	Stockholders Equity StockholdersEquity	2148643000	USD
CY2016Q4	us-gaap	Stockholders Equity StockholdersEquity	2153906000	USD
CY2017Q3	us-gaap	Stockholders Equity StockholdersEquity	2247592000	USD
CY2016Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2152662000	USD
CY2016Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2157866000	USD
CY2017Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2252162000	USD
	us-gaap	Stockholders Equity Other StockholdersEquityOther	1352000	USD
CY2017Q3	us-gaap	Sales Revenue Net SalesRevenueNet	408324000	USD
	us-gaap	Sales Revenue Net SalesRevenueNet	1043874000	USD
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	72397	shares
	us-gaap	Share Based Goods And Nonemployee Services Transaction Quantity Of Securities Issued ShareBasedGoodsAndNonemployeeServicesTransactionQuantityOfSecuritiesIssued	12050	shares
CY2016Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	21800000	USD
CY2017Q3	us-gaap	Short Term Borrowings ShortTermBorrowings	2425000	USD
CY2016Q4	us-gaap	Short Term Debt Weighted Average Interest Rate ShortTermDebtWeightedAverageInterestRate	0.0113
CY2017Q3	us-gaap	Taxes Payable Current TaxesPayableCurrent	57902000	USD
CY2016Q4	us-gaap	Trading Securities TradingSecurities	111000	USD
CY2017Q3	us-gaap	Trading Securities TradingSecurities	84000	USD
CY2016Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	23244	shares
CY2017Q3	us-gaap	Treasury Stock Shares TreasuryStockShares	26979	shares
CY2015Q4	us-gaap	Treasury Stock Value TreasuryStockValue	57000	USD
CY2016Q3	us-gaap	Treasury Stock Value TreasuryStockValue	201000	USD
CY2016Q4	us-gaap	Treasury Stock Value TreasuryStockValue	243000	USD
CY2017Q3	us-gaap	Treasury Stock Value TreasuryStockValue	1368000	USD
	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	3287000	USD
	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	3188000	USD
CY2016Q4	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	80738000	USD
CY2017Q3	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	59697000	USD
CY2016Q3	us-gaap	Utilities Operating Expense UtilitiesOperatingExpense	270546000	USD
	us-gaap	Utilities Operating Expense UtilitiesOperatingExpense	738990000	USD
CY2017Q3	us-gaap	Utilities Operating Expense UtilitiesOperatingExpense	284114000	USD
	us-gaap	Utilities Operating Expense UtilitiesOperatingExpense	783247000	USD
CY2016Q3	us-gaap	Utilities Operating Expense Depreciation And Amortization UtilitiesOperatingExpenseDepreciationAndAmortization	36036000	USD
	us-gaap	Utilities Operating Expense Depreciation And Amortization UtilitiesOperatingExpenseDepreciationAndAmortization	107447000	USD
CY2017Q3	us-gaap	Utilities Operating Expense Depreciation And Amortization UtilitiesOperatingExpenseDepreciationAndAmortization	40259000	USD
	us-gaap	Utilities Operating Expense Depreciation And Amortization UtilitiesOperatingExpenseDepreciationAndAmortization	122262000	USD
CY2016Q3	us-gaap	Utilities Operating Expense Fuel Used UtilitiesOperatingExpenseFuelUsed	73925000	USD
	us-gaap	Utilities Operating Expense Fuel Used UtilitiesOperatingExpenseFuelUsed	139657000	USD
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	50299000	shares
CY2017Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	50362000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	50361000	shares
CY2017Q3	us-gaap	Utilities Operating Expense Fuel Used UtilitiesOperatingExpenseFuelUsed	54529000	USD
	us-gaap	Utilities Operating Expense Fuel Used UtilitiesOperatingExpenseFuelUsed	111197000	USD
CY2016Q3	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	87090000	USD
	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	259813000	USD
CY2017Q3	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	84197000	USD
	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	259445000	USD
CY2016Q3	us-gaap	Utilities Operating Expense Purchased Power UtilitiesOperatingExpensePurchasedPower	74448000	USD
	us-gaap	Utilities Operating Expense Purchased Power UtilitiesOperatingExpensePurchasedPower	170675000	USD
CY2017Q3	us-gaap	Utilities Operating Expense Purchased Power UtilitiesOperatingExpensePurchasedPower	75653000	USD
	us-gaap	Utilities Operating Expense Purchased Power UtilitiesOperatingExpensePurchasedPower	186275000	USD
CY2016Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	50393000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	50361000	shares
CY2017Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	50421000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	50408000	shares
CY2016Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	50296000	shares
	us-gaap	Comparability Of Prior Year Financial Data ComparabilityOfPriorYearFinancialData	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">In the opinion of management of IDACORP and Idaho Power, the accompanying unaudited condensed consolidated financial statements contain all adjustments necessary to present fairly each company's consolidated financial position as of </font><font style="font-family:inherit;font-size:10pt;">September 30, 2017</font><font style="font-family:inherit;font-size:10pt;">, consolidated results of operations for the </font><font style="font-family:inherit;font-size:10pt;">three and nine months ended</font><font style="font-family:inherit;font-size:10pt;"> </font><font style="font-family:inherit;font-size:10pt;">September 30, 2017</font><font style="font-family:inherit;font-size:10pt;"> and </font><font style="font-family:inherit;font-size:10pt;">2016</font><font style="font-family:inherit;font-size:10pt;">, and consolidated cash flows for the </font><font style="font-family:inherit;font-size:10pt;">nine months ended</font><font style="font-family:inherit;font-size:10pt;"> </font><font style="font-family:inherit;font-size:10pt;">September 30, 2017</font><font style="font-family:inherit;font-size:10pt;"> and </font><font style="font-family:inherit;font-size:10pt;">2016</font><font style="font-family:inherit;font-size:10pt;">. These adjustments are of a normal and recurring nature. These financial statements do not contain the complete detail or footnote disclosure concerning accounting policies and other matters that would be included in full-year financial statements and should be read in conjunction with the audited consolidated financial statements included in IDACORP’s and Idaho Power’s Annual Report on Form 10-K for the year ended </font><font style="font-family:inherit;font-size:10pt;">December 31, 2016</font><font style="font-family:inherit;font-size:10pt;">. The results of operations for the interim period are not necessarily indicative of the results to be expected for the full year. A change in management's estimates or assumptions could have a material impact on IDACORP's or Idaho Power's respective financial condition and results of operations during the period in which such change occurred.</font></div></div>
	us-gaap	Derivatives Methods Of Accounting Nonhedging Derivatives DerivativesMethodsOfAccountingNonhedgingDerivatives	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Idaho Power is exposed to market risk relating to electricity, natural gas, and other fuel commodity prices, all of which are heavily influenced by supply and demand. Market risk may be influenced by market participants’ nonperformance of their contractual obligations and commitments, which affects the supply of or demand for the commodity. Idaho Power uses derivative instruments, such as physical and financial forward contracts, for both electricity and fuel to manage the risks relating to these commodity price exposures. The primary objectives of Idaho Power’s energy purchase and sale activity are to meet the demand of retail electric customers, maintain appropriate physical reserves to ensure reliability, and make economic use of temporary surpluses that may develop.</font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">All of Idaho Power's derivative instruments have been entered into for the purpose of economically hedging forecasted purchases and sales, though none of these instruments have been designated as cash flow hedges. Idaho Power offsets fair value amounts recognized on its balance sheet and applies collateral related to derivative instruments executed with the same counterparty under the same master netting agreement. Idaho Power does not offset a counterparty's current derivative contracts with the counterparty's long-term derivative contracts, although Idaho Power's master netting arrangements would allow current and long-term positions to be offset in the event of default. Also, in the event of default, Idaho Power's master netting arrangements would allow for the offsetting of all transactions executed under the master netting arrangement. These types of transactions may include non-derivative instruments, derivatives qualifying for scope exceptions, receivables and payables arising from settled positions, and other forms of non-cash collateral (such as letters of credit). These types of transactions are excluded from the offsetting presented in the derivative fair value and offsetting table that follows.</font></div></div>
	us-gaap	Derivatives Reporting Of Derivative Activity DerivativesReportingOfDerivativeActivity	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Settlement gains and losses on electricity swap contracts are recorded on the income statement in off-system sales or purchased power depending on the forecasted position being economically hedged by the derivative contract. Settlement gains and losses on contracts for natural gas are reflected in fuel expense. Settlement gains and losses on diesel derivatives are recorded in other operations and maintenance expense.</font></div></div>
	us-gaap	Loss Contingency Disclosures LossContingencyDisclosures	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">CONTINGENCIES</font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;"> </font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">IDACORP and Idaho Power have in the past and expect in the future to become involved in various claims, controversies, disputes, and other contingent matters, some of which involve litigation and regulatory or other contested proceedings. The ultimate resolution and outcome of litigation and regulatory proceedings is inherently difficult to determine, particularly where (a) the remedies or penalties sought are indeterminate, (b) the proceedings are in the early stages or the substantive issues have not been well developed, or (c) the matters involve complex or novel legal theories or a large number of parties. In accordance with applicable accounting guidance, IDACORP and Idaho Power, as applicable, establish an accrual for legal proceedings when those matters proceed to a stage where they present loss contingencies that are both probable and reasonably estimable. If the loss contingency at issue is not both probable and reasonably estimable, IDACORP and Idaho Power do not establish an accrual and the matter will continue to be monitored for any developments that would make the loss contingency both probable and reasonably estimable. As of the date of this report, IDACORP's and Idaho Power's accruals for loss contingencies are not material to their financial statements as a whole; however, future accruals could be material in a given period. IDACORP's and Idaho Power's determination is based on currently available information, and estimates presented in financial statements and other financial disclosures involve significant judgment and may be subject to significant uncertainty. For matters that affect Idaho Power’s operations, Idaho Power intends to seek, to the extent permissible and appropriate, recovery through the ratemaking process of costs incurred.</font></div><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">IDACORP and Idaho Power are parties to legal claims and legal and regulatory actions and proceedings in the ordinary course of business and, as noted above, record an accrual for associated loss contingencies when they are probable and reasonably estimable. As of the date of this report, the companies believe that resolution of those matters will not have a material adverse effect on their respective consolidated financial statements. Idaho Power is also actively monitoring various pending environmental regulations and the recently issued executive orders related to environmental matters that may have a significant impact on its future operations. Given uncertainties regarding the outcome, timing, and compliance plans for these environmental matters, Idaho Power is unable to estimate the financial impact of these regulations.</font></div></div>
	us-gaap	Nature Of Operations NatureOfOperations	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">IDACORP is a holding company formed in 1998 whose principal operating subsidiary is Idaho Power. Idaho Power is an electric utility engaged in the generation, transmission, distribution, sale, and purchase of electric energy and capacity with a service area covering approximately 24,000 square miles in southern Idaho and eastern Oregon. Idaho Power is regulated primarily by the state utility regulatory commissions of Idaho and Oregon and the Federal Energy Regulatory Commission (FERC). Idaho Power is the parent of Idaho Energy Resources Co. (IERCo), a joint venturer in Bridger Coal Company (BCC), which mines and supplies coal to the Jim Bridger generating plant owned in part by Idaho Power.</font></div><div style="line-height:120%;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"> </font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">IDACORP’s significant other wholly-owned subsidiaries include IDACORP Financial Services, Inc. (IFS), an investor in affordable housing and other real estate investments, and Ida-West Energy Company (Ida-West), an operator of small hydroelectric generation projects that satisfy the requirements of the Public Utility Regulatory Policies Act of 1978 (PURPA). </font></div></div>
	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">In these consolidated financial statements, certain immaterial amounts in prior periods' footnotes are reclassified to conform with the current period presentation.</font></div></div>
	us-gaap	Use Of Estimates UseOfEstimates	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Management makes estimates and assumptions when preparing financial statements in conformity with generally accepted accounting principles. These estimates and assumptions include those related to rate regulation, retirement benefits, contingencies, litigation, asset impairment, income taxes, unbilled revenues, and bad debt. These estimates and assumptions affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. These estimates involve judgments with respect to, among other things, future economic factors that are difficult to predict and are beyond management's control. Accordingly, actual results could differ from those estimates.</font></div></div>

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$IDA
IDACORP INC Stock $ida

2017 Q4 Form 10-Q Financial Statement

#000105787717000132 Filed on November 02, 2017

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$IDA IDACORP INC Stock $ida

2017 Q4 Form 10-Q Financial Statement

#000105787717000132 Filed on November 02, 2017

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$IDA
IDACORP INC Stock $ida