$OTTR
Otter Tail Corp Stock $ottr

$ottr Overview Financials Valuation SEC Filings Company Website

2023 Q1 Form 10-K Financial Statement

#000146659323000053 Filed on February 15, 2023

Income Statement

Concept	2023 Q1	2022 Q4	2022
Revenue	$339.1M	$301.4M	$1.469B
YoY Change	-9.56%	-9.55%	22.78%
Cost Of Revenue	$154.2M	$135.0M	$643.2M
YoY Change	-10.5%	-12.73%	16.15%
Gross Profit	$184.9M	$166.4M	$817.0M
YoY Change	-8.75%	-6.79%	27.05%
Gross Profit Margin	54.53%	55.2%	55.6%
Selling, General & Admin	$18.70M		$69.72M
YoY Change			6.61%
% of Gross Profit	10.11%		8.53%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$23.86M	$22.77M	$92.60M
YoY Change	1.31%	-2.07%	1.36%
% of Gross Profit	12.9%	13.68%	11.33%
Operating Expenses	$104.2M	$111.4M	$426.5M
YoY Change	-0.1%	3.82%	8.44%
Operating Profit	$80.67M	$54.94M	$390.4M
YoY Change	-17.93%	-22.79%	56.36%
Interest Expense	-$9.415M	-$8.818M	$36.02M
YoY Change	5.22%	-3.84%	-195.35%
% of Operating Profit	-11.67%	-16.05%	9.22%
Other Income/Expense, Net	$2.118M	$3.090M	$2.037M
YoY Change	714.62%	930.0%	-29.76%
Pretax Income	$75.79M	$49.21M	$357.5M
YoY Change	-15.45%	-20.99%	68.0%
Income Tax	$13.30M	$7.208M	$73.35M
% Of Pretax Income	17.55%	14.65%	20.52%
Net Earnings	$62.48M	$42.01M	$284.2M
YoY Change	-13.22%	-18.62%	60.77%
Net Earnings / Revenue	18.43%	13.94%	19.34%
Basic Earnings Per Share	$1.50		$6.83
Diluted Earnings Per Share	$1.49	$1.00	$6.78
COMMON SHARES
Basic Shares Outstanding	41.63M shares	41.63M shares	41.59M shares
Diluted Shares Outstanding	41.98M shares		41.93M shares

Balance Sheet

Concept	2023 Q1	2022 Q4	2022
SHORT-TERM ASSETS
Cash & Short-Term Investments	$104.1M	$119.0M	$119.0M
YoY Change	7491.54%	7642.09%	7642.09%
Cash & Equivalents	$104.1M	$119.0M	$119.0M
Short-Term Investments
Other Short-Term Assets	$13.51M	$18.41M	$67.34M
YoY Change	-6.81%	8.1%	-1.37%
Inventory	$144.8M	$146.0M	$146.0M
Prepaid Expenses
Receivables	$143.1M	$110.5M	$110.5M
Other Receivables	$8.918M	$9.983M	$9.983M
Total Short-Term Assets	$454.4M	$452.8M	$452.8M
YoY Change	12.92%	22.58%	22.58%
LONG-TERM ASSETS
Property, Plant & Equipment	$2.289B	$2.213B	$2.231B
YoY Change	7.57%	4.15%	4.09%
Goodwill	$37.57M	$37.57M
YoY Change	0.0%	0.0%
Intangibles	$7.668M	$7.943M
YoY Change	-12.55%	-12.17%
Long-Term Investments	$58.06M	$54.85M	$54.85M
YoY Change	0.29%	-3.25%	-3.25%
Other Assets	$43.08M	$41.18M	$117.2M
YoY Change	33.12%	28.45%	-15.32%
Total Long-Term Assets	$2.533B	$2.449B	$2.449B
YoY Change	6.01%	2.66%	2.66%
TOTAL ASSETS
Total Short-Term Assets	$454.4M	$452.8M	$452.8M
Total Long-Term Assets	$2.533B	$2.449B	$2.449B
Total Assets	$2.987B	$2.902B	$2.902B
YoY Change	7.01%	5.33%	5.33%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$93.54M	$104.4M	$104.4M
YoY Change	-21.41%	-22.72%	-22.72%
Accrued Expenses	$20.15M	$32.33M	$37.40M
YoY Change	1.53%	-63.0%	-57.2%
Deferred Revenue
YoY Change
Short-Term Debt	$60.85M	$8.204M	$8.204M
YoY Change	-37.76%	-91.0%	-91.0%
Long-Term Debt Due		$0.00	$0.00
YoY Change		-100.0%	-100.0%
Total Short-Term Liabilities	$262.5M	$237.6M	$237.6M
YoY Change	-29.66%	-38.71%	-38.71%
LONG-TERM LIABILITIES
Long-Term Debt	$823.9M	$823.8M	$823.8M
YoY Change	12.23%	12.24%	12.24%
Other Long-Term Liabilities	$65.44M	$60.99M	$385.7M
YoY Change	3.06%	-2.47%	-11.83%
Total Long-Term Liabilities	$637.3M	$622.9M	$1.209B
YoY Change	-0.01%	-3.03%	3.25%
TOTAL LIABILITIES
Total Short-Term Liabilities	$262.5M	$237.6M	$237.6M
Total Long-Term Liabilities	$637.3M	$622.9M	$1.209B
Total Liabilities	$899.8M	$860.5M	$1.684B
YoY Change	-10.96%	-16.46%	-4.52%
SHAREHOLDERS EQUITY
Retained Earnings	$629.4M	$585.2M
YoY Change	48.24%	58.26%
Common Stock	$633.4M	$631.2M
YoY Change	0.62%	0.59%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$1.264B	$1.217B	$1.217B
YoY Change
Total Liabilities & Shareholders Equity	$2.987B	$2.902B	$2.902B
YoY Change	7.01%	5.33%	5.33%

Cashflow Statement

Concept	2023 Q1	2022 Q4	2022
OPERATING ACTIVITIES
Net Income	$62.48M	$42.01M	$284.2M
YoY Change	-13.22%	-18.62%	60.77%
Depreciation, Depletion And Amortization	$23.86M	$22.77M	$92.60M
YoY Change	1.31%	-2.07%	1.36%
Cash From Operating Activities	$55.55M	$101.3M	$389.3M
YoY Change	22.32%	32.48%	68.35%
INVESTING ACTIVITIES
Capital Expenditures	$98.10M	$47.91M	$171.1M
YoY Change	-441.7%	-187.88%	-199.6%
Acquisitions
YoY Change
Other Investing Activities	-$2.278M	$392.0K	-$3.937M
YoY Change	-16.83%	330.77%	-1334.17%
Cash From Investing Activities	-$100.4M	-$47.52M	-$175.1M
YoY Change	219.18%	-12.7%	2.08%
FINANCING ACTIVITIES
Cash Dividend Paid	$18.26M		$68.76M
YoY Change	6.26%		6.0%
Common Stock Issuance & Retirement, Net			$0.00
YoY Change			-100.0%
Debt Paid & Issued, Net			$30.00M
YoY Change			-78.6%
Cash From Financing Activities	$29.91M	-7.812M	-$96.78M
YoY Change	-311.63%	-64.17%	63.04%
NET CHANGE
Cash From Operating Activities	$55.55M	101.3M	$389.3M
Cash From Investing Activities	-$100.4M	-47.52M	-$175.1M
Cash From Financing Activities	$29.91M	-7.812M	-$96.78M
Net Change In Cash	-$14.92M	46.01M	$117.5M
YoY Change	8885.54%	17261.89%	31306.15%
FREE CASH FLOW
Cash From Operating Activities	$55.55M	$101.3M	$389.3M
Capital Expenditures	$98.10M	$47.91M	$171.1M
Free Cash Flow	-$42.55M	$53.43M	$218.2M
YoY Change	-157.4%	-59.22%	-45.87%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2022	dei	Entity Central Index Key EntityCentralIndexKey	0001466593
CY2022	dei	Amendment Flag AmendmentFlag	false
CY2022	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2022	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2022
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CY2022Q4	us-gaap	Operating Lease Right Of Use Asset Statement Of Financial Position Extensible List OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2022#OtherAssetsNoncurrent
CY2021Q4	us-gaap	Operating Lease Liability Current Statement Of Financial Position Extensible List OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2022#OtherLiabilitiesCurrent
CY2022Q4	us-gaap	Operating Lease Liability Current Statement Of Financial Position Extensible List OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2022#OtherLiabilitiesCurrent
CY2022Q4	us-gaap	Operating Lease Liability Noncurrent Statement Of Financial Position Extensible List OperatingLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2022#OtherLiabilitiesNoncurrent
CY2021Q4	us-gaap	Operating Lease Liability Noncurrent Statement Of Financial Position Extensible List OperatingLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2022#OtherLiabilitiesNoncurrent
CY2021Q4	us-gaap	Derivative Liability Statement Of Financial Position Extensible Enumeration DerivativeLiabilityStatementOfFinancialPositionExtensibleEnumeration	http://fasb.org/us-gaap/2022#OtherLiabilitiesCurrent
CY2022Q4	us-gaap	Derivative Liability Statement Of Financial Position Extensible Enumeration DerivativeLiabilityStatementOfFinancialPositionExtensibleEnumeration	http://fasb.org/us-gaap/2022#OtherLiabilitiesCurrent
CY2021Q4	us-gaap	Derivative Asset Statement Of Financial Position Extensible Enumeration DerivativeAssetStatementOfFinancialPositionExtensibleEnumeration	http://fasb.org/us-gaap/2022#OtherAssetsCurrent
CY2022Q4	us-gaap	Derivative Asset Statement Of Financial Position Extensible Enumeration DerivativeAssetStatementOfFinancialPositionExtensibleEnumeration	http://fasb.org/us-gaap/2022#OtherAssetsCurrent
CY2022	dei	Document Type DocumentType	10-K
CY2022	dei	Document Annual Report DocumentAnnualReport	true
CY2022	dei	Document Period End Date DocumentPeriodEndDate	2022-12-31
CY2022	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2022	dei	Document Transition Report DocumentTransitionReport	false
CY2022	dei	Entity File Number EntityFileNumber	0-53713
CY2022	dei	Entity Registrant Name EntityRegistrantName	OTTER TAIL CORPORATION
CY2022	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	MN
CY2022	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	27-0383995
CY2022	dei	Entity Address Address Line1 EntityAddressAddressLine1	215 South Cascade Street
CY2022	dei	Entity Address Address Line2 EntityAddressAddressLine2	Box 496
CY2022	dei	Entity Address City Or Town EntityAddressCityOrTown	Fergus Falls
CY2022	dei	Entity Address State Or Province EntityAddressStateOrProvince	MN
CY2022	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	56538-0496
CY2022	dei	City Area Code CityAreaCode	866
CY2022	dei	Local Phone Number LocalPhoneNumber	410-8780
CY2022	dei	Security12b Title Security12bTitle	Common Shares, par value $5.00 per share
CY2022	dei	Trading Symbol TradingSymbol	OTTR
CY2022	dei	Security Exchange Name SecurityExchangeName	NASDAQ
CY2022	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2022	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2022	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2022	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2022	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2022	dei	Entity Small Business EntitySmallBusiness	false
CY2022	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2022	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2022	dei	Entity Shell Company EntityShellCompany	false
CY2022Q2	dei	Entity Public Float EntityPublicFloat	2689579964	usd
CY2023Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	41631763	shares
CY2022	dei	Auditor Firm AuditorFirmId	34
CY2022	dei	Auditor Name AuditorName	Deloitte & Touche LLP
CY2022	dei	Auditor Location AuditorLocation	Minneapolis, Minnesota
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CY2021Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1537000	usd
CY2022Q4	us-gaap	Accounts Receivable Net AccountsReceivableNet	144393000	usd
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CY2022Q4	us-gaap	Inventory Net InventoryNet	145952000	usd
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CY2022Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	24999000	usd
CY2021Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	27342000	usd
CY2022Q4	us-gaap	Other Assets Current OtherAssetsCurrent	18412000	usd
CY2021Q4	us-gaap	Other Assets Current OtherAssetsCurrent	17032000	usd
CY2022Q4	us-gaap	Assets Current AssetsCurrent	452752000	usd
CY2021Q4	us-gaap	Assets Current AssetsCurrent	369354000	usd
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CY2021Q4	us-gaap	Long Term Investments LongTermInvestments	56690000	usd
CY2022Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	2212717000	usd
CY2021Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	2124605000	usd
CY2022Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	94655000	usd
CY2021Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	125508000	usd
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CY2021Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	91163000	usd
CY2022Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	0	usd
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CY2022Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	32327000	usd
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CY2022Q4	us-gaap	Accrual For Taxes Other Than Income Taxes Current AccrualForTaxesOtherThanIncomeTaxesCurrent	19340000	usd
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CY2021Q4	us-gaap	Liabilities Current LiabilitiesCurrent	387699000	usd
CY2022Q4	us-gaap	Defined Benefit Pension Plan Liabilities Noncurrent DefinedBenefitPensionPlanLiabilitiesNoncurrent	33210000	usd
CY2021Q4	us-gaap	Defined Benefit Pension Plan Liabilities Noncurrent DefinedBenefitPensionPlanLiabilitiesNoncurrent	73973000	usd
CY2022Q4	us-gaap	Other Postretirement Defined Benefit Plan Liabilities Noncurrent OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent	46977000	usd
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CY2022Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	41631113	shares
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CY2021	us-gaap	Interest Expense InterestExpense	37771000	usd
CY2020	us-gaap	Interest Expense InterestExpense	34447000	usd
CY2022	us-gaap	Net Periodic Defined Benefits Expense Reversal Of Expense Excluding Service Cost Component NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent	-1075000	usd
CY2021	us-gaap	Net Periodic Defined Benefits Expense Reversal Of Expense Excluding Service Cost Component NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent	2016000	usd
CY2020	us-gaap	Net Periodic Defined Benefits Expense Reversal Of Expense Excluding Service Cost Component NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent	3437000	usd
CY2022	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	2037000	usd
CY2021	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	2900000	usd
CY2020	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	6055000	usd
CY2022	us-gaap	Income Loss Attributable To Parent IncomeLossAttributableToParent	357535000	usd
CY2021	us-gaap	Income Loss Attributable To Parent IncomeLossAttributableToParent	212821000	usd
CY2020	us-gaap	Income Loss Attributable To Parent IncomeLossAttributableToParent	116057000	usd
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	73351000	usd
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	36052000	usd
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	20206000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	284184000	usd
CY2021	us-gaap	Net Income Loss NetIncomeLoss	176769000	usd
CY2020	us-gaap	Net Income Loss NetIncomeLoss	95851000	usd
CY2022	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	41586000	shares
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	41491000	shares
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	40710000	shares
CY2022	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	41931000	shares
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	41818000	shares
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	40905000	shares
CY2022	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	6.83
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.26
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.35
CY2022	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	6.78
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.23
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.34
CY2022	us-gaap	Net Income Loss NetIncomeLoss	284184000	usd
CY2021	us-gaap	Net Income Loss NetIncomeLoss	176769000	usd
CY2020	us-gaap	Net Income Loss NetIncomeLoss	95851000	usd
CY2022	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-115000	usd
CY2021	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-52000	usd
CY2020	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	42000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-432000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-196000	usd
CY2020	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	155000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-2769000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-766000	usd
CY2020	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	796000	usd
CY2022	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	-7871000	usd
CY2021	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	-2179000	usd
CY2020	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	2225000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	7439000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	1983000	usd
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-2070000	usd
CY2022	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	291623000	usd
CY2021	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	178752000	usd
CY2020	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	93781000	usd
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	781482000	usd
CY2020	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	36808000	usd
CY2020	ottr	Stock Issued During Period Value Dividend Reinvestment And Employee Stock Purchase Plans StockIssuedDuringPeriodValueDividendReinvestmentAndEmployeeStockPurchasePlans	15047000	usd
CY2020	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	-2122000	usd
CY2020	us-gaap	Net Income Loss NetIncomeLoss	95851000	usd
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-2070000	usd
CY2020	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	6284000	usd
CY2020	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.48
CY2020	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	60314000	usd
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	870966000	usd
CY2021	ottr	Stock Issued During Period Value Dividend Reinvestment And Employee Stock Purchase Plans StockIssuedDuringPeriodValueDividendReinvestmentAndEmployeeStockPurchasePlans	504000	usd
CY2021	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	-1489000	usd
CY2021	us-gaap	Net Income Loss NetIncomeLoss	176769000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	1983000	usd
CY2021	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	6908000	usd
CY2021	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.56
CY2021	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	64864000	usd
CY2021Q4	us-gaap	Stockholders Equity StockholdersEquity	990777000	usd
CY2022	us-gaap	Adjustments To Additional Paid In Capital Share Based Compensation Employee Stock Purchase Program Requisite Service Period Recognition AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationEmployeeStockPurchaseProgramRequisiteServicePeriodRecognition	-219000	usd
CY2022	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	-2923000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	284184000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	7439000	usd
CY2022	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	6814000	usd
CY2022	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.65
CY2022	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	68755000	usd
CY2022Q4	us-gaap	Stockholders Equity StockholdersEquity	1217317000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	284184000	usd
CY2021	us-gaap	Net Income Loss NetIncomeLoss	176769000	usd
CY2020	us-gaap	Net Income Loss NetIncomeLoss	95851000	usd
CY2022	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	92597000	usd
CY2021	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	91358000	usd
CY2020	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	82037000	usd
CY2022	us-gaap	Income Tax Credits And Adjustments IncomeTaxCreditsAndAdjustments	-745000	usd
CY2021	us-gaap	Income Tax Credits And Adjustments IncomeTaxCreditsAndAdjustments	-744000	usd
CY2020	us-gaap	Income Tax Credits And Adjustments IncomeTaxCreditsAndAdjustments	-1221000	usd
CY2022	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	32424000	usd
CY2021	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	28896000	usd
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	15201000	usd
CY2022	us-gaap	Pension Contributions PensionContributions	20000000	usd
CY2021	us-gaap	Pension Contributions PensionContributions	10000000	usd
CY2020	us-gaap	Pension Contributions PensionContributions	11200000	usd
CY2022	us-gaap	Increase Decrease In Allowance For Equity Funds Used During Construction IncreaseDecreaseInAllowanceForEquityFundsUsedDuringConstruction	1690000	usd
CY2021	us-gaap	Increase Decrease In Allowance For Equity Funds Used During Construction IncreaseDecreaseInAllowanceForEquityFundsUsedDuringConstruction	822000	usd
CY2020	us-gaap	Increase Decrease In Allowance For Equity Funds Used During Construction IncreaseDecreaseInAllowanceForEquityFundsUsedDuringConstruction	4063000	usd
CY2022	us-gaap	Share Based Compensation ShareBasedCompensation	6814000	usd
CY2020	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	5227000	usd
CY2021	us-gaap	Share Based Compensation ShareBasedCompensation	6908000	usd
CY2020	us-gaap	Share Based Compensation ShareBasedCompensation	6284000	usd
CY2022	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-3513000	usd
CY2021	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	3035000	usd
CY2020	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-222000	usd
CY2022	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	-30560000	usd
CY2021	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	60994000	usd
CY2020	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	6328000	usd
CY2022	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-5339000	usd
CY2021	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	54313000	usd
CY2020	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-5686000	usd
CY2022	us-gaap	Increase Decrease In Other Regulatory Assets IncreaseDecreaseInOtherRegulatoryAssets	2464000	usd
CY2021	us-gaap	Increase Decrease In Other Regulatory Assets IncreaseDecreaseInOtherRegulatoryAssets	4803000	usd
CY2020	us-gaap	Increase Decrease In Other Regulatory Assets IncreaseDecreaseInOtherRegulatoryAssets	4070000	usd
CY2022	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	368000	usd
CY2021	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	14146000	usd
CY2022	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-29763000	usd
CY2021	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	38734000	usd
CY2020	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	3832000	usd
CY2022	us-gaap	Increase Decrease In Accrued Liabilities And Other Operating Liabilities IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities	-5490000	usd
CY2021	us-gaap	Increase Decrease In Accrued Liabilities And Other Operating Liabilities IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities	28386000	usd
CY2020	us-gaap	Increase Decrease In Accrued Liabilities And Other Operating Liabilities IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities	19262000	usd
CY2022	us-gaap	Increase Decrease In Regulatory Liabilities IncreaseDecreaseInRegulatoryLiabilities	-6846000	usd
CY2021	us-gaap	Increase Decrease In Regulatory Liabilities IncreaseDecreaseInRegulatoryLiabilities	1948000	usd
CY2020	us-gaap	Increase Decrease In Regulatory Liabilities IncreaseDecreaseInRegulatoryLiabilities	7204000	usd
CY2022	ottr	Increase Decrease In Interest Payable And Income Taxes Receivable Payable Net IncreaseDecreaseInInterestPayableAndIncomeTaxesReceivablePayableNet	1244000	usd
CY2021	ottr	Increase Decrease In Interest Payable And Income Taxes Receivable Payable Net IncreaseDecreaseInInterestPayableAndIncomeTaxesReceivablePayableNet	7101000	usd
CY2020	ottr	Increase Decrease In Interest Payable And Income Taxes Receivable Payable Net IncreaseDecreaseInInterestPayableAndIncomeTaxesReceivablePayableNet	8451000	usd
CY2022	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	389309000	usd
CY2021	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	231243000	usd
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	211921000	usd
CY2022	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	171134000	usd
CY2021	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	171829000	usd
CY2020	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	371553000	usd
CY2022	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	4346000	usd
CY2021	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	9702000	usd
CY2020	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	5011000	usd
CY2022	us-gaap	Payments For Proceeds From Investments PaymentsForProceedsFromInvestments	8283000	usd
CY2021	us-gaap	Payments For Proceeds From Investments PaymentsForProceedsFromInvestments	9383000	usd
CY2020	us-gaap	Payments For Proceeds From Investments PaymentsForProceedsFromInvestments	9110000	usd
CY2022	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-175071000	usd
CY2021	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-171510000	usd
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-375652000	usd
CY2022	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-82959000	usd
CY2021	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	10166000	usd
CY2020	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	74997000	usd
CY2022	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	usd
CY2021	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	696000	usd
CY2020	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	52432000	usd
CY2022	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	90000000	usd
CY2021	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	140000000	usd
CY2020	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	75000000	usd
CY2022	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	30000000	usd
CY2021	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	140169000	usd
CY2020	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	182000	usd
CY2022	us-gaap	Payments Of Dividends PaymentsOfDividends	68755000	usd
CY2021	us-gaap	Payments Of Dividends PaymentsOfDividends	64864000	usd
CY2020	us-gaap	Payments Of Dividends PaymentsOfDividends	60314000	usd
CY2022	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	2942000	usd
CY2021	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	1507000	usd
CY2020	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	2069000	usd
CY2022	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-2123000	usd
CY2021	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-3681000	usd
CY2020	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	3831000	usd
CY2022	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-96779000	usd
CY2021	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-59359000	usd
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	143695000	usd
CY2022	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	117459000	usd
CY2021	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	374000	usd
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-20036000	usd
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1537000	usd
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1163000	usd
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	21199000	usd
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	118996000	usd
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1537000	usd
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1163000	usd
CY2022	us-gaap	Interest Paid Net InterestPaidNet	35699000	usd
CY2021	us-gaap	Interest Paid Net InterestPaidNet	36881000	usd
CY2020	us-gaap	Interest Paid Net InterestPaidNet	33199000	usd
CY2022	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	43411000	usd
CY2021	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	6500000	usd
CY2021	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	8445000	usd
CY2020	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	5177000	usd
CY2022	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	12420000	usd
CY2021	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	12081000	usd
CY2020	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	34265000	usd
CY2022	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	3	segment
CY2022	us-gaap	Use Of Estimates UseOfEstimates	<div><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:700;line-height:120%">Use of Estimates</span></div><div style="margin-bottom:6pt"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:400;line-height:120%">We use estimates based on the best information available in recording transactions and balances resulting from business operations. As better information becomes available, or actual amounts are known, the recorded estimates are revised. Consequently, operating results can be affected by revisions to prior accounting estimates.</span></div>
CY2020	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	5300000	usd
CY2022Q4	us-gaap	Inventory Finished Goods Net Of Reserves InventoryFinishedGoodsNetOfReserves	43812000	usd
CY2021Q4	us-gaap	Inventory Finished Goods Net Of Reserves InventoryFinishedGoodsNetOfReserves	39903000	usd
CY2022Q4	us-gaap	Inventory Work In Process InventoryWorkInProcess	31766000	usd
CY2021Q4	us-gaap	Inventory Work In Process InventoryWorkInProcess	35705000	usd
CY2022Q4	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	70374000	usd
CY2021Q4	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	72882000	usd
CY2022Q4	us-gaap	Inventory Net InventoryNet	145952000	usd
CY2021Q4	us-gaap	Inventory Net InventoryNet	148490000	usd
CY2022Q4	us-gaap	Life Insurance Corporate Or Bank Owned Amount LifeInsuranceCorporateOrBankOwnedAmount	38991000	usd
CY2021Q4	us-gaap	Life Insurance Corporate Or Bank Owned Amount LifeInsuranceCorporateOrBankOwnedAmount	41078000	usd
CY2022Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	8761000	usd
CY2021Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	9202000	usd
CY2022Q4	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	5503000	usd
CY2021Q4	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	5432000	usd
CY2022Q4	us-gaap	Money Market Funds At Carrying Value MoneyMarketFundsAtCarryingValue	1560000	usd
CY2021Q4	us-gaap	Money Market Funds At Carrying Value MoneyMarketFundsAtCarryingValue	949000	usd
CY2022Q4	us-gaap	Other Investments OtherInvestments	30000	usd
CY2021Q4	us-gaap	Other Investments OtherInvestments	29000	usd
CY2022Q4	us-gaap	Investments Investments	54845000	usd
CY2021Q4	us-gaap	Investments Investments	56690000	usd
CY2022Q4	ottr	Number Of Jointly Owned Electric Generation Plants NumberOfJointlyOwnedElectricGenerationPlants	2	plant
CY2022Q4	ottr	Number Of Jointly Owned Major Transmission Lines NumberOfJointlyOwnedMajorTransmissionLines	5	plant
CY2022	us-gaap	Number Of Reporting Units NumberOfReportingUnits	3	numberofreportingunit
CY2022	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	3	segment
CY2022	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	1460209000	usd
CY2021	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	1196844000	usd
CY2020	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	890107000	usd
CY2022	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	92597000	usd
CY2021	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	91358000	usd
CY2020	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	82037000	usd
CY2022	us-gaap	Operating Income Loss OperatingIncomeLoss	390439000	usd
CY2021	us-gaap	Operating Income Loss OperatingIncomeLoss	249708000	usd
CY2020	us-gaap	Operating Income Loss OperatingIncomeLoss	147886000	usd
CY2022	us-gaap	Interest And Debt Expense InterestAndDebtExpense	36016000	usd
CY2021	us-gaap	Interest And Debt Expense InterestAndDebtExpense	37771000	usd
CY2020	us-gaap	Interest And Debt Expense InterestAndDebtExpense	34447000	usd
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	73351000	usd
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	36052000	usd
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	20206000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	284184000	usd
CY2021	us-gaap	Net Income Loss NetIncomeLoss	176769000	usd
CY2020	us-gaap	Net Income Loss NetIncomeLoss	95851000	usd
CY2022	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	171134000	usd
CY2021	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	171829000	usd
CY2020	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	371553000	usd
CY2022Q4	us-gaap	Assets Assets	2901661000	usd
CY2021Q4	us-gaap	Assets Assets	2754830000	usd
CY2022	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	1460209000	usd
CY2021	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	1196844000	usd
CY2020	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	890107000	usd
CY2022	us-gaap	Revenues Revenues	1469475000	usd
CY2021	us-gaap	Revenues Revenues	1197635000	usd
CY2020	us-gaap	Revenues Revenues	883171000	usd
CY2022Q4	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	112126000	usd
CY2021Q4	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	142297000	usd
CY2022Q4	us-gaap	Other Receivables Gross Current OtherReceivablesGrossCurrent	9983000	usd
CY2021Q4	us-gaap	Other Receivables Gross Current OtherReceivablesGrossCurrent	10591000	usd
CY2022Q4	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	23932000	usd
CY2021Q4	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	23901000	usd
CY2022Q4	us-gaap	Accounts Receivable Gross AccountsReceivableGross	146041000	usd
CY2021Q4	us-gaap	Accounts Receivable Gross AccountsReceivableGross	176789000	usd
CY2022Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	1648000	usd
CY2021Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	1836000	usd
CY2022Q4	us-gaap	Accounts Receivable Net AccountsReceivableNet	144393000	usd
CY2021Q4	us-gaap	Accounts Receivable Net AccountsReceivableNet	174953000	usd
CY2021Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	1836000	usd
CY2020Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	3215000	usd
CY2022	us-gaap	Allowance For Doubtful Accounts Receivable Period Increase Decrease AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease	909000	usd
CY2021	us-gaap	Allowance For Doubtful Accounts Receivable Period Increase Decrease AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease	93000	usd
CY2022	ottr	Accounts Receivable Allowance For Credit Loss Writeoff After Recovery AccountsReceivableAllowanceForCreditLossWriteoffAfterRecovery	1097000	usd
CY2021	ottr	Accounts Receivable Allowance For Credit Loss Writeoff After Recovery AccountsReceivableAllowanceForCreditLossWriteoffAfterRecovery	1472000	usd
CY2022Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	1648000	usd
CY2021Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	1836000	usd
CY2022Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	24999000	usd
CY2022Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	94655000	usd
CY2021Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	27342000	usd
CY2021Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	125508000	usd
CY2022Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	17300000	usd
CY2022Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	244497000	usd
CY2021Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	24844000	usd
CY2021Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	234430000	usd
CY2022Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	2212717000	usd
CY2021Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	2124605000	usd
CY2022	us-gaap	Depreciation Depreciation	84400000	usd
CY2021	us-gaap	Depreciation Depreciation	85800000	usd
CY2020	us-gaap	Depreciation Depreciation	78600000	usd
CY2022Q4	us-gaap	Goodwill Goodwill	37572000	usd
CY2021Q4	us-gaap	Goodwill Goodwill	37572000	usd
CY2022Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	22517000	usd
CY2022Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	14574000	usd
CY2022Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	7943000	usd
CY2021Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	22517000	usd
CY2021Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	13473000	usd
CY2021Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	9044000	usd
CY2020	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1100000	usd
CY2022	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1100000	usd
CY2021	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1100000	usd
CY2022Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	1100000	usd
CY2022Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	1100000	usd
CY2022Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	1100000	usd
CY2022Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	1092000	usd
CY2022Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	1090000	usd
CY2022	us-gaap	Operating Lease Cost OperatingLeaseCost	5606000	usd
CY2021	us-gaap	Operating Lease Cost OperatingLeaseCost	5298000	usd
CY2022	us-gaap	Variable Lease Cost VariableLeaseCost	1386000	usd
CY2021	us-gaap	Variable Lease Cost VariableLeaseCost	1020000	usd
CY2022	us-gaap	Short Term Lease Cost ShortTermLeaseCost	1517000	usd
CY2021	us-gaap	Short Term Lease Cost ShortTermLeaseCost	1465000	usd
CY2022	us-gaap	Lease Cost LeaseCost	8509000	usd
CY2021	us-gaap	Lease Cost LeaseCost	7783000	usd
CY2022	us-gaap	Operating Lease Payments OperatingLeasePayments	5592000	usd
CY2021	us-gaap	Operating Lease Payments OperatingLeasePayments	5642000	usd
CY2022Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	18610000	usd
CY2021Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	19133000	usd
CY2022Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	5071000	usd
CY2021Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	4168000	usd
CY2022Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	13876000	usd
CY2021Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	15309000	usd
CY2022Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	18947000	usd
CY2021Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	19477000	usd
CY2022	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	3700000	usd
CY2021	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	2100000	usd
CY2022Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	5802000	usd
CY2022Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	5263000	usd
CY2022Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	4355000	usd
CY2022Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	2544000	usd
CY2022Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	1722000	usd
CY2022Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	1163000	usd
CY2022Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	20849000	usd
CY2022Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	1902000	usd
CY2022Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	18947000	usd
CY2022Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P4Y2M12D
CY2021Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P4Y10M24D
CY2022Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0473
CY2021Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0509
CY2022Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	8204000	usd
CY2021Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	91163000	usd
CY2022Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	0	usd
CY2021Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	29983000	usd
CY2022Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	823821000	usd
CY2021Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	734014000	usd
CY2022Q4	us-gaap	Debt Longterm And Shortterm Combined Amount DebtLongtermAndShorttermCombinedAmount	832025000	usd
CY2021Q4	us-gaap	Debt Longterm And Shortterm Combined Amount DebtLongtermAndShorttermCombinedAmount	855160000	usd
CY2022Q4	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	340000000	usd
CY2022Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	8204000	usd
CY2022Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	9573000	usd
CY2022Q4	us-gaap	Line Of Credit Facility Remaining Borrowing Capacity LineOfCreditFacilityRemainingBorrowingCapacity	322223000	usd
CY2021Q4	us-gaap	Line Of Credit Facility Remaining Borrowing Capacity LineOfCreditFacilityRemainingBorrowingCapacity	235678000	usd
CY2022Q4	us-gaap	Debt Weighted Average Interest Rate DebtWeightedAverageInterestRate	0.0561
CY2021Q4	us-gaap	Debt Weighted Average Interest Rate DebtWeightedAverageInterestRate	0.0142
CY2022Q4	us-gaap	Long Term Debt LongTermDebt	827000000	usd
CY2021Q4	us-gaap	Long Term Debt LongTermDebt	767000000	usd
CY2022Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	0	usd
CY2021Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	29983000	usd
CY2022Q4	us-gaap	Debt Instrument Unamortized Discount DebtInstrumentUnamortizedDiscount	3179000	usd
CY2021Q4	us-gaap	Debt Instrument Unamortized Discount DebtInstrumentUnamortizedDiscount	3003000	usd
CY2022Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	823821000	usd
CY2021Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	734014000	usd
CY2022Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	0	usd
CY2022Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	0	usd
CY2022Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	0	usd
CY2022Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	80000000	usd
CY2022Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	42000000	usd
CY2022Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	313798000	usd
CY2021Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	387212000	usd
CY2022	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	5913000	usd
CY2021	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	11366000	usd
CY2020	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	12617000	usd
CY2022	ottr	Defined Benefit Plan Net Periodic Benefit Cost Credit Deferred DefinedBenefitPlanNetPeriodicBenefitCostCreditDeferred	-1121000	usd
CY2021	ottr	Defined Benefit Plan Net Periodic Benefit Cost Credit Deferred DefinedBenefitPlanNetPeriodicBenefitCostCreditDeferred	-21000	usd
CY2020	ottr	Defined Benefit Plan Net Periodic Benefit Cost Credit Deferred DefinedBenefitPlanNetPeriodicBenefitCostCreditDeferred	533000	usd
CY2022	ottr	Defined Benefit Plan Net Periodic Benefit Cost Credit Net Of Deferrals DefinedBenefitPlanNetPeriodicBenefitCostCreditNetOfDeferrals	7034000	usd
CY2021	ottr	Defined Benefit Plan Net Periodic Benefit Cost Credit Net Of Deferrals DefinedBenefitPlanNetPeriodicBenefitCostCreditNetOfDeferrals	11387000	usd
CY2020	ottr	Defined Benefit Plan Net Periodic Benefit Cost Credit Net Of Deferrals DefinedBenefitPlanNetPeriodicBenefitCostCreditNetOfDeferrals	12084000	usd
CY2022	us-gaap	Pension Contributions PensionContributions	20000000	usd
CY2021	us-gaap	Pension Contributions PensionContributions	10000000	usd
CY2020	us-gaap	Pension Contributions PensionContributions	11200000	usd
CY2022Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Next Twelve Months DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths	23468000	usd
CY2022Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Two DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo	24410000	usd
CY2022Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Three DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree	25072000	usd
CY2022Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Four DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour	25837000	usd
CY2022Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Five DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive	26497000	usd
CY2022Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Five Fiscal Years Thereafter DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter	138378000	usd
CY2022	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	6700000	usd
CY2022Q4	us-gaap	Asset Retirement Obligation Legally Restricted Assets Fair Value AssetRetirementObligationLegallyRestrictedAssetsFairValue	0	usd
CY2021Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	24191000	usd
CY2020Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	23821000	usd
CY2022	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	0	usd
CY2021	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	-568000	usd
CY2022	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	991000	usd
CY2021	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	938000	usd
CY2022Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	25182000	usd
CY2021Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	24191000	usd
CY2021	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	586000	usd
CY2022	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	31949000	usd
CY2021	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	6806000	usd
CY2020	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	3631000	usd
CY2022	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	9568000	usd
CY2021	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	939000	usd
CY2020	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	2415000	usd
CY2022	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	22480000	usd
CY2021	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	18180000	usd
CY2020	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	11450000	usd
CY2022	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	9943000	usd
CY2021	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	10716000	usd
CY2020	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	3751000	usd
CY2022	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	586000	usd
CY2020	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	1033000	usd
CY2022	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	3000	usd
CY2021	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	3000	usd
CY2020	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	8000	usd
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	73351000	usd
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	36052000	usd
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	20206000	usd
CY2022	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	75082000	usd
CY2022	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2021	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	44692000	usd
CY2021	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2020	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	24372000	usd
CY2020	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2022	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	15049000	usd
CY2022	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.042
CY2021	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	9962000	usd
CY2021	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.047
CY2020	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	4597000	usd
CY2020	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.040
CY2022	ottr	Effective Income Tax Rate Reconciliation Deduction Production Tax Credits Amount EffectiveIncomeTaxRateReconciliationDeductionProductionTaxCreditsAmount	-14985000	usd
CY2022	ottr	Effective Income Tax Rate Reconciliation Deduction Production Tax Credits Percent EffectiveIncomeTaxRateReconciliationDeductionProductionTaxCreditsPercent	-0.042
CY2021	ottr	Effective Income Tax Rate Reconciliation Deduction Production Tax Credits Amount EffectiveIncomeTaxRateReconciliationDeductionProductionTaxCreditsAmount	-12503000	usd
CY2021	ottr	Effective Income Tax Rate Reconciliation Deduction Production Tax Credits Percent EffectiveIncomeTaxRateReconciliationDeductionProductionTaxCreditsPercent	-0.059
CY2020	ottr	Effective Income Tax Rate Reconciliation Deduction Production Tax Credits Amount EffectiveIncomeTaxRateReconciliationDeductionProductionTaxCreditsAmount	-1250000	usd
CY2020	ottr	Effective Income Tax Rate Reconciliation Deduction Production Tax Credits Percent EffectiveIncomeTaxRateReconciliationDeductionProductionTaxCreditsPercent	-0.011
CY2022	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	-1625000	usd
CY2022	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	-0.005
CY2021	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	-4262000	usd
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	-0.020
CY2020	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	-4167000	usd
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	-0.036
CY2022	ottr	Effective Income Tax Rate Reconciliation Tax Credit Amortization Amount EffectiveIncomeTaxRateReconciliationTaxCreditAmortizationAmount	-586000	usd
CY2022	ottr	Effective Income Tax Rate Reconciliation Tax Credit Amortization Percent EffectiveIncomeTaxRateReconciliationTaxCreditAmortizationPercent	-0.002
CY2021	ottr	Effective Income Tax Rate Reconciliation Tax Credit Amortization Amount EffectiveIncomeTaxRateReconciliationTaxCreditAmortizationAmount	-586000	usd
CY2021	ottr	Effective Income Tax Rate Reconciliation Tax Credit Amortization Percent EffectiveIncomeTaxRateReconciliationTaxCreditAmortizationPercent	-0.003
CY2020	ottr	Effective Income Tax Rate Reconciliation Tax Credit Amortization Amount EffectiveIncomeTaxRateReconciliationTaxCreditAmortizationAmount	-1033000	usd
CY2020	ottr	Effective Income Tax Rate Reconciliation Tax Credit Amortization Percent EffectiveIncomeTaxRateReconciliationTaxCreditAmortizationPercent	-0.009
CY2022	ottr	Effective Income Tax Rate Reconciliation Allowance For Equity Funds Used During Construction Amount EffectiveIncomeTaxRateReconciliationAllowanceForEquityFundsUsedDuringConstructionAmount	-440000	usd
CY2022	ottr	Effective Income Tax Rate Reconciliation Allowance For Equity Funds Used During Construction Percent EffectiveIncomeTaxRateReconciliationAllowanceForEquityFundsUsedDuringConstructionPercent	-0.001
CY2021	ottr	Effective Income Tax Rate Reconciliation Allowance For Equity Funds Used During Construction Amount EffectiveIncomeTaxRateReconciliationAllowanceForEquityFundsUsedDuringConstructionAmount	-214000	usd
CY2021	ottr	Effective Income Tax Rate Reconciliation Allowance For Equity Funds Used During Construction Percent EffectiveIncomeTaxRateReconciliationAllowanceForEquityFundsUsedDuringConstructionPercent	-0.001
CY2020	ottr	Effective Income Tax Rate Reconciliation Allowance For Equity Funds Used During Construction Amount EffectiveIncomeTaxRateReconciliationAllowanceForEquityFundsUsedDuringConstructionAmount	-796000	usd
CY2020	ottr	Effective Income Tax Rate Reconciliation Allowance For Equity Funds Used During Construction Percent EffectiveIncomeTaxRateReconciliationAllowanceForEquityFundsUsedDuringConstructionPercent	-0.007
CY2022	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	856000	usd
CY2022	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.003
CY2021	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-1037000	usd
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.005
CY2020	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-1517000	usd
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.013
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	73351000	usd
CY2022	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.205
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	36052000	usd
CY2021	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.169
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	20206000	usd
CY2020	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.174
CY2022Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits	39216000	usd
CY2021Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits	41842000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Regulatory Assets And Liabilities DeferredTaxAssetsRegulatoryAssetsAndLiabilities	57353000	usd
CY2021Q4	us-gaap	Deferred Tax Assets Regulatory Assets And Liabilities DeferredTaxAssetsRegulatoryAssetsAndLiabilities	75293000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Other DeferredTaxAssetsTaxCreditCarryforwardsOther	20209000	usd
CY2021Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Other DeferredTaxAssetsTaxCreditCarryforwardsOther	27965000	usd
CY2022Q4	ottr	Deferred Tax Assets Cost Of Removal DeferredTaxAssetsCostOfRemoval	37360000	usd
CY2021Q4	ottr	Deferred Tax Assets Cost Of Removal DeferredTaxAssetsCostOfRemoval	26512000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	1853000	usd
CY2021Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	1323000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	12107000	usd
CY2021Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	11067000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	168098000	usd
CY2021Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	184002000	usd
CY2022Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	334201000	usd
CY2021Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	297981000	usd
CY2022Q4	ottr	Deferred Tax Liabilities Retirement Benefits Regulatory Asset DeferredTaxLiabilitiesRetirementBenefitsRegulatoryAsset	22789000	usd
CY2021Q4	ottr	Deferred Tax Liabilities Retirement Benefits Regulatory Asset DeferredTaxLiabilitiesRetirementBenefitsRegulatoryAsset	40766000	usd
CY2022Q4	ottr	Deferred Tax Liabilities Pension Expense DeferredTaxLiabilitiesPensionExpense	24269000	usd
CY2021Q4	ottr	Deferred Tax Liabilities Pension Expense DeferredTaxLiabilitiesPensionExpense	24578000	usd
CY2022Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	8141000	usd
CY2021Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	8945000	usd
CY2022Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	389400000	usd
CY2021Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	372270000	usd
CY2022Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	221302000	usd
CY2021Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	188268000	usd
CY2021Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	827000	usd
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	771000	usd
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1488000	usd
CY2022	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	44000	usd
CY2021	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	11000	usd
CY2020	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	178000	usd
CY2022	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	260000	usd
CY2021	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	189000	usd
CY2020	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	175000	usd
CY2022	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions	0	usd
CY2021	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions	0	usd
CY2020	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions	575000	usd
CY2022	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	208000	usd
CY2021	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	144000	usd
CY2020	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	139000	usd
CY2022Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	923000	usd
CY2021Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	827000	usd
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	771000	usd
CY2022	ottr	Period For Unrecognized Tax Benefits Not Expected Change PeriodForUnrecognizedTaxBenefitsNotExpectedChange	P12M
CY2022	ottr	Capacity And Energy Requirement Costs CapacityAndEnergyRequirementCosts	13100000	usd
CY2021	ottr	Capacity And Energy Requirement Costs CapacityAndEnergyRequirementCosts	11500000	usd
CY2020	ottr	Capacity And Energy Requirement Costs CapacityAndEnergyRequirementCosts	11300000	usd
CY2022	ottr	Coal Purchase Commitment Costs CoalPurchaseCommitmentCosts	45100000	usd
CY2021	ottr	Coal Purchase Commitment Costs CoalPurchaseCommitmentCosts	40400000	usd
CY2020	ottr	Coal Purchase Commitment Costs CoalPurchaseCommitmentCosts	37900000	usd
CY2022	ottr	Land Easement Non Lease Payments Expense LandEasementNonLeasePaymentsExpense	1400000	usd
CY2021	ottr	Land Easement Non Lease Payments Expense LandEasementNonLeasePaymentsExpense	1300000	usd
CY2020	ottr	Land Easement Non Lease Payments Expense LandEasementNonLeasePaymentsExpense	1300000	usd
CY2020	us-gaap	Oci Before Reclassifications Net Of Tax Attributable To Parent OciBeforeReclassificationsNetOfTaxAttributableToParent	563000	usd
CY2020	us-gaap	Reclassification From Aoci Current Period Net Of Tax Attributable To Parent ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent	2633000	usd
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-2070000	usd
CY2021	us-gaap	Oci Before Reclassifications Net Of Tax Attributable To Parent OciBeforeReclassificationsNetOfTaxAttributableToParent	1506000	usd
CY2021	us-gaap	Reclassification From Aoci Current Period Net Of Tax Attributable To Parent ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent	-477000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	1983000	usd
CY2022	us-gaap	Oci Before Reclassifications Net Of Tax Attributable To Parent OciBeforeReclassificationsNetOfTaxAttributableToParent	6898000	usd
CY2022	us-gaap	Reclassification From Aoci Current Period Net Of Tax Attributable To Parent ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent	-541000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	7439000	usd
CY2022	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	41586000	shares
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	41491000	shares
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	40710000	shares
CY2022	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	345000	shares
CY2021	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	327000	shares
CY2020	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	195000	shares
CY2022	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	41931000	shares
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	41818000	shares
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	40905000	shares
CY2022	us-gaap	Derivative Nonmonetary Notional Amount Energy Measure DerivativeNonmonetaryNotionalAmountEnergyMeasure	295000	mwh
CY2021	us-gaap	Derivative Nonmonetary Notional Amount Energy Measure DerivativeNonmonetaryNotionalAmountEnergyMeasure	263400	mwh
CY2021Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	7100000	usd
CY2022Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	7100000	usd
CY2022Q4	us-gaap	Derivative Assets DerivativeAssets	6200000	usd
CY2021Q4	us-gaap	Derivative Assets DerivativeAssets	6200000	usd
CY2022	us-gaap	Cash Dividends Paid To Parent Company CashDividendsPaidToParentCompany	68680000	usd
CY2021	us-gaap	Cash Dividends Paid To Parent Company CashDividendsPaidToParentCompany	64790000	usd
CY2020	us-gaap	Cash Dividends Paid To Parent Company CashDividendsPaidToParentCompany	55614000	usd

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$OTTR
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2023 Q1 Form 10-K Financial Statement

#000146659323000053 Filed on February 15, 2023

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$OTTR Otter Tail Corp Stock $ottr

2023 Q1 Form 10-K Financial Statement

#000146659323000053 Filed on February 15, 2023

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$OTTR
Otter Tail Corp Stock $ottr