$OTTR
Otter Tail Corp Stock $ottr

$ottr Overview Financials Valuation SEC Filings Company Website

2019 Q4 Form 10-Q Financial Statement

#000143774919022085 Filed on November 08, 2019

Income Statement

Concept	2019 Q4	2019 Q3	2018 Q3
Revenue	$215.7M	$228.7M	$227.7M
YoY Change	-2.49%	0.43%	5.18%
Cost Of Revenue	$95.10M	$101.9M	$103.0M
YoY Change	-6.4%	-1.07%	19.45%
Gross Profit	$120.6M	$126.8M	$124.7M
YoY Change	0.84%	1.68%	-4.24%
Gross Profit Margin	55.91%	55.46%	54.77%
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$19.90M	$19.66M	$18.71M
YoY Change	7.57%	5.07%	4.36%
% of Gross Profit	16.5%	15.5%	15.0%
Operating Expenses	$89.30M	$89.50M	$86.40M
YoY Change	-7.17%	3.59%	1.41%
Operating Profit	$31.30M	$37.26M	$38.26M
YoY Change	33.76%	-2.63%	15.9%
Interest Expense	-$8.200M	-$7.500M	-$7.500M
YoY Change	5.13%	0.0%	1.35%
% of Operating Profit	-26.2%	-20.13%	-19.6%
Other Income/Expense, Net	$900.0K	$1.020M	$1.245M
YoY Change	-181.82%	-18.07%	110.3%
Pretax Income	$23.90M	$29.68M	$30.63M
YoY Change	64.83%	-3.1%	23.48%
Income Tax	$3.500M	$4.936M	$7.359M
% Of Pretax Income	14.64%	16.63%	24.02%
Net Earnings	$20.40M	$24.75M	$23.27M
YoY Change	43.66%	6.32%	31.23%
Net Earnings / Revenue	9.46%	10.82%	10.22%
Basic Earnings Per Share		$0.62	$0.59
Diluted Earnings Per Share	$510.0K	$0.62	$0.58
COMMON SHARES
Basic Shares Outstanding	39.76M	39.71M	39.62M
Diluted Shares Outstanding		39.95M	39.90M

Balance Sheet

Concept	2019 Q4	2019 Q3	2018 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$21.20M	$900.0K	$600.0K
YoY Change	2255.56%	50.0%	-25.0%
Cash & Equivalents	$21.20M	$921.0K	$649.0K
Short-Term Investments
Other Short-Term Assets	$6.529M	$6.926M	$8.611M
YoY Change	6.79%	-19.57%	-48.48%
Inventory	$97.85M	$97.05M	$94.62M
Prepaid Expenses
Receivables	$77.95M	$92.19M	$96.10M
Other Receivables	$8.773M	$8.884M	$8.036M
Total Short-Term Assets	$254.9M	$237.7M	$241.4M
YoY Change	5.57%	-1.56%	5.79%
LONG-TERM ASSETS
Property, Plant & Equipment	$1.754B	$1.692B	$1.565B
YoY Change	10.92%	8.11%	2.93%
Goodwill	$37.57M	$37.57M	$37.57M
YoY Change	0.0%	0.0%	0.0%
Intangibles	$11.29M	$11.56M	$12.75M
YoY Change	-9.32%	-9.29%	-9.58%
Long-Term Investments	$9.900M	$9.700M	$9.100M
YoY Change	10.0%	6.59%	5.81%
Other Assets	$26.57M	$39.00M	$36.72M
YoY Change	-25.71%	6.2%	4.94%
Total Long-Term Assets	$2.019B	$1.943B	$1.786B
YoY Change	11.46%	8.76%	2.72%
TOTAL ASSETS
Total Short-Term Assets	$254.9M	$237.7M	$241.4M
Total Long-Term Assets	$2.019B	$1.943B	$1.786B
Total Assets	$2.274B	$2.180B	$2.027B
YoY Change	10.77%	7.54%	3.08%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$120.8M	$89.36M	$91.03M
YoY Change	25.43%	-1.84%	-5.39%
Accrued Expenses	$37.80M	$30.60M	$30.90M
YoY Change	2.16%	-0.97%	-3.44%
Deferred Revenue
YoY Change
Short-Term Debt	$6.000M	$109.0M	$15.49M
YoY Change	-67.74%	603.71%	-85.05%
Long-Term Debt Due	$183.0K	$180.0K	$169.0K
YoY Change	6.4%	6.51%	-14.21%
Total Short-Term Liabilities	$189.7M	$253.2M	$163.5M
YoY Change	11.55%	54.9%	-33.6%
LONG-TERM LIABILITIES
Long-Term Debt	$689.6M	$590.0M	$590.0M
YoY Change	16.88%	0.01%	20.31%
Other Long-Term Liabilities	$51.91M	$28.13M	$25.89M
YoY Change	113.4%	8.66%	12.95%
Total Long-Term Liabilities	$612.8M	$618.1M	$615.9M
YoY Change	-0.25%	0.37%	19.98%
TOTAL LIABILITIES
Total Short-Term Liabilities	$189.7M	$253.2M	$163.5M
Total Long-Term Liabilities	$612.8M	$618.1M	$615.9M
Total Liabilities	$802.5M	$871.3M	$779.3M
YoY Change	2.31%	11.81%	2.61%
SHAREHOLDERS EQUITY
Retained Earnings	$222.3M	$215.9M	$189.6M
YoY Change	16.76%	13.9%	21.82%
Common Stock	$565.6M	$545.1M	$541.5M
YoY Change	4.24%	0.65%	0.22%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$781.5M	$756.5M	$725.3M
YoY Change
Total Liabilities & Shareholders Equity	$2.274B	$2.180B	$2.027B
YoY Change	10.77%	7.54%	3.08%

Cashflow Statement

Concept	2019 Q4	2019 Q3	2018 Q3
OPERATING ACTIVITIES
Net Income	$20.40M	$24.75M	$23.27M
YoY Change	43.66%	6.32%	31.23%
Depreciation, Depletion And Amortization	$19.90M	$19.66M	$18.71M
YoY Change	7.57%	5.07%	4.36%
Cash From Operating Activities	$79.90M	$35.80M	$47.50M
YoY Change	88.0%	-24.63%	6.03%
INVESTING ACTIVITIES
Capital Expenditures	-$57.70M	-$95.70M	-$25.40M
YoY Change	86.73%	276.77%	-33.33%
Acquisitions
YoY Change
Other Investing Activities	-$700.0K	$0.00	-$800.0K
YoY Change	16.67%	-100.0%	100.0%
Cash From Investing Activities	-$58.40M	-$95.70M	-$26.20M
YoY Change	85.4%	265.27%	-32.3%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-1.200M	59.80M	-21.60M
YoY Change	-88.99%	-376.85%	307.55%
NET CHANGE
Cash From Operating Activities	79.90M	35.80M	47.50M
Cash From Investing Activities	-58.40M	-95.70M	-26.20M
Cash From Financing Activities	-1.200M	59.80M	-21.60M
Net Change In Cash	20.30M	-100.0K	-300.0K
YoY Change	20200.0%	-66.67%	-137.5%
FREE CASH FLOW
Cash From Operating Activities	$79.90M	$35.80M	$47.50M
Capital Expenditures	-$57.70M	-$95.70M	-$25.40M
Free Cash Flow	$137.6M	$131.5M	$72.90M
YoY Change	87.47%	80.38%	-12.06%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2019Q3	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	39755277
CY2018Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	39664884
CY2019Q4	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	39759054
CY2018	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2019Q3	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	5
CY2018Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	5
CY2019Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	50000000
CY2018Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	50000000
CY2019Q3	ottr	Effective Income Tax Rate Reconciliation At Federal And State Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalAndStateStatutoryIncomeTaxRate	0.26	pure
CY2018Q3	ottr	Effective Income Tax Rate Reconciliation At Federal And State Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalAndStateStatutoryIncomeTaxRate	0.26	pure
	ottr	Effective Income Tax Rate Reconciliation At Federal And State Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalAndStateStatutoryIncomeTaxRate	0.26	pure
	ottr	Effective Income Tax Rate Reconciliation At Federal And State Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalAndStateStatutoryIncomeTaxRate	0.26	pure
CY2019Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	921000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	861000	USD
CY2019Q3	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	92189000	USD
CY2018Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	75144000	USD
CY2019Q3	us-gaap	Other Receivables Net Current OtherReceivablesNetCurrent	8884000	USD
CY2018Q4	us-gaap	Other Receivables Net Current OtherReceivablesNetCurrent	9741000	USD
CY2019Q3	us-gaap	Inventory Net InventoryNet	97052000	USD
CY2018Q4	us-gaap	Inventory Net InventoryNet	106270000	USD
CY2019Q3	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	19020000	USD
CY2018Q4	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	23626000	USD
CY2019Q3	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	0	USD
CY2018Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	2439000	USD
CY2019Q3	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	12667000	USD
CY2018Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	17225000	USD
CY2019Q3	us-gaap	Other Assets Current OtherAssetsCurrent	6926000	USD
CY2018Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	848369000	USD
CY2018Q4	us-gaap	Liabilities Current LiabilitiesCurrent	170093000	USD
CY2019Q3	us-gaap	Defined Benefit Pension Plan Liabilities Noncurrent DefinedBenefitPensionPlanLiabilitiesNoncurrent	75363000	USD
CY2018Q4	us-gaap	Other Assets Current OtherAssetsCurrent	6114000	USD
CY2019Q3	us-gaap	Assets Current AssetsCurrent	237659000	USD
CY2018Q4	us-gaap	Assets Current AssetsCurrent	241420000	USD
CY2019Q3	us-gaap	Long Term Investments LongTermInvestments	9743000	USD
CY2018Q4	us-gaap	Long Term Investments LongTermInvestments	8961000	USD
CY2019Q3	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	38996000	USD
CY2018Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	35759000	USD
CY2019Q3	us-gaap	Goodwill Goodwill	37572000	USD
CY2018Q4	us-gaap	Goodwill Goodwill	37572000	USD
CY2019Q3	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	11562000	USD
CY2018Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	12450000	USD
CY2019Q3	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	130551000	USD
CY2018Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	135257000	USD
CY2019Q3	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	21953000	USD
CY2018Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	0	USD
CY2019Q3	ottr	Public Utilities Property Plant And Equipment Electric PublicUtilitiesPropertyPlantAndEquipmentElectric	2189732000	USD
CY2018Q4	ottr	Public Utilities Property Plant And Equipment Electric PublicUtilitiesPropertyPlantAndEquipmentElectric	2019721000	USD
CY2019Q3	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	238542000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	228120000	USD
CY2019Q3	us-gaap	Construction In Progress Gross ConstructionInProgressGross	141839000	USD
CY2018Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	181626000	USD
CY2019Q3	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	2570113000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	2429467000	USD
CY2019Q3	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	877958000	USD
CY2019Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1692155000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1581098000	USD
CY2019Q3	us-gaap	Assets Assets	2180191000	USD
CY2018Q4	us-gaap	Assets Assets	2052517000	USD
CY2019Q3	us-gaap	Short Term Borrowings ShortTermBorrowings	108997000	USD
CY2018Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	18599000	USD
CY2019Q3	us-gaap	Long Term Debt Current LongTermDebtCurrent	180000	USD
CY2018Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	172000	USD
CY2019Q3	us-gaap	Accounts Payable Current AccountsPayableCurrent	89360000	USD
CY2018Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	96291000	USD
CY2019Q3	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	19151000	USD
CY2018Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	24857000	USD
CY2019Q3	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	3945000	USD
CY2018Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	0	USD
CY2019Q3	us-gaap	Accrual For Taxes Other Than Income Taxes Current AccrualForTaxesOtherThanIncomeTaxesCurrent	13828000	USD
CY2018Q4	us-gaap	Accrual For Taxes Other Than Income Taxes Current AccrualForTaxesOtherThanIncomeTaxesCurrent	17287000	USD
CY2019Q3	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	6311000	USD
CY2018Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	738000	USD
CY2019Q3	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	4006000	USD
CY2018Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	0	USD
CY2019Q3	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	7409000	USD
CY2018Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	12149000	USD
CY2019Q3	us-gaap	Liabilities Current LiabilitiesCurrent	253187000	USD
CY2018Q4	us-gaap	Defined Benefit Pension Plan Liabilities Noncurrent DefinedBenefitPensionPlanLiabilitiesNoncurrent	98358000	USD
CY2019Q3	us-gaap	Other Postretirement Defined Benefit Plan Liabilities Noncurrent OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent	73668000	USD
CY2018Q4	us-gaap	Other Postretirement Defined Benefit Plan Liabilities Noncurrent OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent	71561000	USD
CY2019Q3	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	18384000	USD
CY2018Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	0	USD
CY2019Q3	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	28130000	USD
CY2018Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	24326000	USD
CY2019Q3	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2018Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2019Q3	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	124602000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	120976000	USD
CY2019Q3	us-gaap	Accumulated Deferred Investment Tax Credit AccumulatedDeferredInvestmentTaxCredit	18963000	USD
CY2018Q4	us-gaap	Accumulated Deferred Investment Tax Credit AccumulatedDeferredInvestmentTaxCredit	19974000	USD
CY2019Q3	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	238781000	USD
CY2018Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	226469000	USD
CY2019Q3	ottr	Other Contracts With Customer Liability Noncurrent OtherContractsWithCustomerLiabilityNoncurrent	2593000	USD
CY2018Q4	ottr	Other Contracts With Customer Liability Noncurrent OtherContractsWithCustomerLiabilityNoncurrent	1895000	USD
CY2019Q3	ottr	Total Deferred Credits And Liabilities TotalDeferredCreditsAndLiabilities	384939000	USD
CY2018Q4	ottr	Total Deferred Credits And Liabilities TotalDeferredCreditsAndLiabilities	369314000	USD
CY2019Q3	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	590015000	USD
CY2018Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	590002000	USD
CY2019Q3	us-gaap	Common Stock Value CommonStockValue	198776000	USD
CY2018Q4	us-gaap	Common Stock Value CommonStockValue	198324000	USD
CY2019Q3	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	346294000	USD
CY2018Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	344250000	USD
CY2019Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	215931000	USD
CY2018Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	190433000	USD
CY2019Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-4496000	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-4144000	USD
CY2019Q3	us-gaap	Stockholders Equity StockholdersEquity	756505000	USD
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CY2019Q3	us-gaap	Capitalization Longterm Debt And Equity CapitalizationLongtermDebtAndEquity	1346520000	USD
CY2018Q4	us-gaap	Capitalization Longterm Debt And Equity CapitalizationLongtermDebtAndEquity	1318865000	USD
CY2019Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	2180191000	USD
CY2018Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	2052517000	USD
CY2019Q3	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	228652000	USD
CY2018Q3	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	227662000	USD
	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	703827000	USD
	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	695276000	USD
CY2019Q3	us-gaap	Utilities Operating Expense Fuel Used UtilitiesOperatingExpenseFuelUsed	18331000	USD
CY2018Q3	us-gaap	Utilities Operating Expense Fuel Used UtilitiesOperatingExpenseFuelUsed	17129000	USD
	us-gaap	Utilities Operating Expense Fuel Used UtilitiesOperatingExpenseFuelUsed	45547000	USD
	us-gaap	Utilities Operating Expense Fuel Used UtilitiesOperatingExpenseFuelUsed	51723000	USD
CY2019Q3	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	35869000	USD
CY2018Q3	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	33897000	USD
	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	114107000	USD
	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	111113000	USD
CY2019Q3	us-gaap	Utilities Operating Expense Products And Services UtilitiesOperatingExpenseProductsAndServices	88747000	USD
CY2018Q3	us-gaap	Utilities Operating Expense Products And Services UtilitiesOperatingExpenseProductsAndServices	93361000	USD
	us-gaap	Utilities Operating Expense Products And Services UtilitiesOperatingExpenseProductsAndServices	277325000	USD
	us-gaap	Utilities Operating Expense Products And Services UtilitiesOperatingExpenseProductsAndServices	275691000	USD
CY2019Q3	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	11665000	USD
CY2018Q3	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	12547000	USD
	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	38404000	USD
	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	37690000	USD
CY2019Q3	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	19657000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	56216000	USD
CY2019Q3	us-gaap	Utilities Operating Expense Other UtilitiesOperatingExpenseOther	3965000	USD
CY2018Q3	us-gaap	Utilities Operating Expense Other UtilitiesOperatingExpenseOther	4094000	USD
	us-gaap	Utilities Operating Expense Other UtilitiesOperatingExpenseOther	11824000	USD
	us-gaap	Utilities Operating Expense Other UtilitiesOperatingExpenseOther	11202000	USD
CY2019Q3	us-gaap	Costs And Expenses CostsAndExpenses	191397000	USD
CY2018Q3	us-gaap	Costs And Expenses CostsAndExpenses	189400000	USD
	us-gaap	Costs And Expenses CostsAndExpenses	600184000	USD
	us-gaap	Costs And Expenses CostsAndExpenses	589294000	USD
CY2018Q3	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	18708000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	58229000	USD
CY2019Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	37255000	USD
CY2018Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	38262000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	103643000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	105982000	USD
CY2019Q3	us-gaap	Interest And Debt Expense InterestAndDebtExpense	7539000	USD
CY2018Q3	us-gaap	Interest And Debt Expense InterestAndDebtExpense	7549000	USD
	us-gaap	Interest And Debt Expense InterestAndDebtExpense	23190000	USD
	us-gaap	Interest And Debt Expense InterestAndDebtExpense	22597000	USD
CY2019Q3	us-gaap	Net Periodic Defined Benefits Expense Reversal Of Expense Excluding Service Cost Component NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent	1055000	USD
CY2018Q3	us-gaap	Net Periodic Defined Benefits Expense Reversal Of Expense Excluding Service Cost Component NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent	1326000	USD
	us-gaap	Net Periodic Defined Benefits Expense Reversal Of Expense Excluding Service Cost Component NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent	3165000	USD
	us-gaap	Net Periodic Defined Benefits Expense Reversal Of Expense Excluding Service Cost Component NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent	4129000	USD
CY2019Q3	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	1020000	USD
CY2018Q3	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	1245000	USD
	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	3114000	USD
	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	3135000	USD
CY2019Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	29681000	USD
CY2018Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	30632000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	80402000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	82391000	USD
CY2019Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	4936000	USD
CY2018Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	7359000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	13907000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	14207000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	24745000	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	23273000	USD
	us-gaap	Net Income Loss NetIncomeLoss	66495000	USD
	us-gaap	Net Income Loss NetIncomeLoss	68184000	USD
CY2019Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	39714672
CY2018Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	39621524
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	39694677
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	39592705
CY2019Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	39946739
CY2018Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	39903565
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	39922580
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	39882105
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.62
CY2018Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.59
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.68
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.72
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.62
CY2018Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.58
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.67
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.71
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	24745000	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	23273000	USD
	us-gaap	Net Income Loss NetIncomeLoss	66495000	USD
	us-gaap	Net Income Loss NetIncomeLoss	68184000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	1000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	-4000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	5000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	106000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	30000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-14000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	187000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-93000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	6000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-2000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	38000	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	389000	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	692000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-34000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-60000	USD
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-101000	USD
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-180000	USD
CY2019Q3	ottr	Other Comprehensive Income Deferred Tax Rate Adjustment OtherComprehensiveIncomeDeferredTaxRateAdjustment	0	USD
CY2018Q3	ottr	Other Comprehensive Income Deferred Tax Rate Adjustment OtherComprehensiveIncomeDeferredTaxRateAdjustment	0	USD
	ottr	Other Comprehensive Income Deferred Tax Rate Adjustment OtherComprehensiveIncomeDeferredTaxRateAdjustment	0	USD
	ottr	Other Comprehensive Income Deferred Tax Rate Adjustment OtherComprehensiveIncomeDeferredTaxRateAdjustment	-531000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-96000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-172000	USD
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-288000	USD
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	19000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	119000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	164000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-42000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	23000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-8000	USD
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	144000	USD
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-157000	USD
CY2019Q3	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	130000	USD
CY2018Q3	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	232000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	432000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-176000	USD
CY2019Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	24864000	USD
CY2018Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	23437000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	66927000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	68008000	USD
CY2019Q2	us-gaap	Stockholders Equity StockholdersEquity	744305000	USD
CY2019Q3	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	-36000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	24745000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	119000	USD
CY2019Q3	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	1301000	USD
CY2019Q3	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	13929000	USD
CY2019Q3	us-gaap	Stockholders Equity StockholdersEquity	756505000	USD
CY2018Q2	us-gaap	Stockholders Equity StockholdersEquity	714581000	USD
CY2018Q3	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	0	USD
CY2018Q3	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	562000	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	23273000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	164000	USD
CY2018Q3	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	1149000	USD
CY2018Q3	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	13303000	USD
CY2018Q3	us-gaap	Stockholders Equity StockholdersEquity	725302000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	728863000	USD
	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	-19000	USD
	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	2730000	USD
	us-gaap	Net Income Loss NetIncomeLoss	66495000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	432000	USD
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	5245000	USD
	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	41781000	USD
CY2019Q3	us-gaap	Stockholders Equity StockholdersEquity	756505000	USD
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	696892000	USD
	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	-93000	USD
	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	3012000	USD
	us-gaap	Net Income Loss NetIncomeLoss	68184000	USD
	us-gaap	Increase Decrease In Allowance For Equity Funds Used During Construction IncreaseDecreaseInAllowanceForEquityFundsUsedDuringConstruction	1586000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	5245000	USD
	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	1879000	USD
	us-gaap	Payments For Proceeds From Investments PaymentsForProceedsFromInvestments	5546000	USD
	us-gaap	Payments For Proceeds From Investments PaymentsForProceedsFromInvestments	3324000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-151130000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-75934000	USD
	ottr	Change In Checks Written In Excess Of Cash ChangeInChecksWrittenInExcessOfCash	-383000	USD
	ottr	Change In Checks Written In Excess Of Cash ChangeInChecksWrittenInExcessOfCash	7000	USD
	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	90398000	USD
	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-96882000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-176000	USD
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	3402000	USD
	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	39895000	USD
CY2018Q3	us-gaap	Stockholders Equity StockholdersEquity	725302000	USD
	us-gaap	Net Income Loss NetIncomeLoss	66495000	USD
	us-gaap	Net Income Loss NetIncomeLoss	68184000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	58229000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	56216000	USD
	us-gaap	Income Tax Credits And Adjustments IncomeTaxCreditsAndAdjustments	-1011000	USD
	us-gaap	Income Tax Credits And Adjustments IncomeTaxCreditsAndAdjustments	-1054000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	3487000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	7529000	USD
	ottr	Increase Decrease In Deferred Charges And Other Assets IncreaseDecreaseInDeferredChargesAndOtherAssets	7142000	USD
	ottr	Increase Decrease In Deferred Charges And Other Assets IncreaseDecreaseInDeferredChargesAndOtherAssets	10641000	USD
	us-gaap	Pension Contributions PensionContributions	22500000	USD
	us-gaap	Pension Contributions PensionContributions	20000000	USD
	ottr	Increase Decrease In Other Operating Liabilities And Increase Decrease In Deferred Liabilities IncreaseDecreaseInOtherOperatingLiabilitiesAndIncreaseDecreaseInDeferredLiabilities	-10344000	USD
	ottr	Increase Decrease In Other Operating Liabilities And Increase Decrease In Deferred Liabilities IncreaseDecreaseInOtherOperatingLiabilitiesAndIncreaseDecreaseInDeferredLiabilities	191000	USD
	us-gaap	Increase Decrease In Allowance For Equity Funds Used During Construction IncreaseDecreaseInAllowanceForEquityFundsUsedDuringConstruction	1602000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	3402000	USD
	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-312000	USD
	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	201000	USD
	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	16213000	USD
	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	27804000	USD
	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-9218000	USD
	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	6581000	USD
	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-2974000	USD
	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-3827000	USD
	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-20744000	USD
	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	5546000	USD
	ottr	Increase Decrease In Interest Payable And Income Taxes Receivable Payable Net IncreaseDecreaseInInterestPayableAndIncomeTaxesReceivablePayableNet	3773000	USD
	ottr	Increase Decrease In Interest Payable And Income Taxes Receivable Payable Net IncreaseDecreaseInInterestPayableAndIncomeTaxesReceivablePayableNet	2932000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	105149000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	100860000	USD
	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	149695000	USD
	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	74489000	USD
	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	4111000	USD
	ottr	Payments For Retirement Of Capital Stock And Common Stock Issuance Expenses PaymentsForRetirementOfCapitalStockAndCommonStockIssuanceExpenses	2765000	USD
	ottr	Payments For Retirement Of Capital Stock And Common Stock Issuance Expenses PaymentsForRetirementOfCapitalStockAndCommonStockIssuanceExpenses	3120000	USD
	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	0	USD
	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	100000000	USD
	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	66000	USD
	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	441000	USD
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	128000	USD
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	148000	USD
	us-gaap	Payments Of Dividends PaymentsOfDividends	41781000	USD
	us-gaap	Payments Of Dividends PaymentsOfDividends	39895000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	46041000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-40493000	USD
	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	60000	USD
	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-15567000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	861000	USD
CY2017Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	16216000	USD
CY2019Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	921000	USD
CY2018Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	649000	USD
CY2019Q3	us-gaap	Inventory Finished Goods Net Of Reserves InventoryFinishedGoodsNetOfReserves	29601000	USD
CY2018Q4	us-gaap	Inventory Finished Goods Net Of Reserves InventoryFinishedGoodsNetOfReserves	37130000	USD
CY2019Q3	us-gaap	Inventory Work In Process InventoryWorkInProcess	18884000	USD
CY2018Q4	us-gaap	Inventory Work In Process InventoryWorkInProcess	20393000	USD
CY2019Q3	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	48567000	USD
CY2018Q4	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	48747000	USD
CY2019Q3	us-gaap	Inventory Net InventoryNet	97052000	USD
CY2018Q4	us-gaap	Inventory Net InventoryNet	106270000	USD
CY2018Q4	us-gaap	Net Regulatory Assets NetRegulatoryAssets	-74725000	USD
	us-gaap	Goodwill Period Increase Decrease GoodwillPeriodIncreaseDecrease	0	USD
CY2018Q4	us-gaap	Goodwill Gross GoodwillGross	37572000	USD
CY2018Q4	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	0	USD
CY2018Q4	us-gaap	Goodwill Goodwill	37572000	USD
	us-gaap	Goodwill Period Increase Decrease GoodwillPeriodIncreaseDecrease	0	USD
CY2019Q3	us-gaap	Goodwill Goodwill	37572000	USD
CY2019Q3	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	22645000	USD
CY2019Q3	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	11083000	USD
CY2019Q3	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	11562000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	22645000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	10195000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	12450000	USD
CY2019Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	296000	USD
CY2018Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	329000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	888000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1019000	USD
CY2019Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Remainder Of Fiscal Year FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear	1184000	USD
CY2019Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	1133000	USD
CY2019Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	1099000	USD
CY2019Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	1099000	USD
CY2019Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	1099000	USD
CY2019Q3	ottr	Net Regulatory Assets Liability Noncurrent NetRegulatoryAssetsLiabilityNoncurrent	-108230000	USD
CY2019Q3	us-gaap	Net Regulatory Assets NetRegulatoryAssets	-101874000	USD
CY2018Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	17225000	USD
CY2018Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	135257000	USD
CY2019Q3	ottr	Accounts Payable Outstanding Related To Capital Additions AccountsPayableOutstandingRelatedToCapitalAdditions	15893000	USD
CY2018Q3	ottr	Accounts Payable Outstanding Related To Capital Additions AccountsPayableOutstandingRelatedToCapitalAdditions	12059000	USD
	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	3	pure
CY2019Q3	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	228652000	USD
CY2018Q3	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	227662000	USD
	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	703827000	USD
	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	695276000	USD
CY2019Q3	us-gaap	Interest And Debt Expense InterestAndDebtExpense	7539000	USD
CY2018Q3	us-gaap	Interest And Debt Expense InterestAndDebtExpense	7549000	USD
	us-gaap	Interest And Debt Expense InterestAndDebtExpense	23190000	USD
	us-gaap	Interest And Debt Expense InterestAndDebtExpense	22597000	USD
CY2019Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	4936000	USD
CY2018Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	7359000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	13907000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	14207000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	24745000	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	23273000	USD
	us-gaap	Net Income Loss NetIncomeLoss	66495000	USD
	us-gaap	Net Income Loss NetIncomeLoss	68184000	USD
CY2019Q3	us-gaap	Assets Assets	2180191000	USD
CY2018Q4	us-gaap	Assets Assets	2052517000	USD
CY2017	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35	pure
CY2018	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21	pure
CY2017	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35	pure
CY2019Q3	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	12667000	USD
CY2019Q3	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	130551000	USD
CY2019Q3	us-gaap	Regulatory Assets RegulatoryAssets	143218000	USD
CY2019Q3	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	6311000	USD
CY2019Q3	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	238781000	USD
CY2019Q3	us-gaap	Regulatory Liabilities RegulatoryLiabilities	245092000	USD
CY2019Q3	ottr	Net Regulatory Assets Liability Current NetRegulatoryAssetsLiabilityCurrent	6356000	USD
CY2018Q4	us-gaap	Regulatory Assets RegulatoryAssets	152482000	USD
CY2018Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	738000	USD
CY2018Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	226469000	USD
CY2018Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	227207000	USD
CY2018Q4	ottr	Net Regulatory Assets Liability Current NetRegulatoryAssetsLiabilityCurrent	16487000	USD
CY2018Q4	ottr	Net Regulatory Assets Liability Noncurrent NetRegulatoryAssetsLiabilityNoncurrent	-91212000	USD
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	39694677
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	39882105
CY2018Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	39664884
	ottr	Stock Issued During Period Shares Vesting Of Restricted Stock Units StockIssuedDuringPeriodSharesVestingOfRestrictedStockUnits	27125
	us-gaap	Stock Issued During Period Shares Restricted Stock Award Gross StockIssuedDuringPeriodSharesRestrictedStockAwardGross	15700
	ottr	Directors Deferred Compensation DirectorsDeferredCompensation	594
	ottr	Shares Withheld For Individual Income Tax Requirements SharesWithheldForIndividualIncomeTaxRequirements	55224
CY2019Q3	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	39755277
CY2019Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	39714672
CY2018Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	39621524
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	39592705
CY2019Q3	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	149023
CY2018Q3	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	206268
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	147106
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	210691
CY2019Q3	ottr	Incremental Common Shares Attributable To Dilutive Effect Of Underlying Shares Related To Nonvested Restricted Stock Units Granted To Employees IncrementalCommonSharesAttributableToDilutiveEffectOfUnderlyingSharesRelatedToNonvestedRestrictedStockUnitsGrantedToEmployees	68138
CY2018Q3	ottr	Incremental Common Shares Attributable To Dilutive Effect Of Underlying Shares Related To Nonvested Restricted Stock Units Granted To Employees IncrementalCommonSharesAttributableToDilutiveEffectOfUnderlyingSharesRelatedToNonvestedRestrictedStockUnitsGrantedToEmployees	58680
	ottr	Incremental Common Shares Attributable To Dilutive Effect Of Underlying Shares Related To Nonvested Restricted Stock Units Granted To Employees IncrementalCommonSharesAttributableToDilutiveEffectOfUnderlyingSharesRelatedToNonvestedRestrictedStockUnitsGrantedToEmployees	63902
	ottr	Incremental Common Shares Attributable To Dilutive Effect Of Underlying Shares Related To Nonvested Restricted Stock Units Granted To Employees IncrementalCommonSharesAttributableToDilutiveEffectOfUnderlyingSharesRelatedToNonvestedRestrictedStockUnitsGrantedToEmployees	58475
CY2019Q3	ottr	Incremental Common Shares Attributable To Dilutive Effect Of Nonvested Restricted Shares IncrementalCommonSharesAttributableToDilutiveEffectOfNonvestedRestrictedShares	13107
CY2018Q3	ottr	Incremental Common Shares Attributable To Dilutive Effect Of Nonvested Restricted Shares IncrementalCommonSharesAttributableToDilutiveEffectOfNonvestedRestrictedShares	14761
	ottr	Incremental Common Shares Attributable To Dilutive Effect Of Nonvested Restricted Shares IncrementalCommonSharesAttributableToDilutiveEffectOfNonvestedRestrictedShares	14896
	ottr	Incremental Common Shares Attributable To Dilutive Effect Of Nonvested Restricted Shares IncrementalCommonSharesAttributableToDilutiveEffectOfNonvestedRestrictedShares	17712
CY2019Q3	ottr	Incremental Common Shares Attributable To Dilutive Effect Of Shares Expected To Be Issued Under Deferred Compensation Program For Directors IncrementalCommonSharesAttributableToDilutiveEffectOfSharesExpectedToBeIssuedUnderDeferredCompensationProgramForDirectors	1799
CY2018Q3	ottr	Incremental Common Shares Attributable To Dilutive Effect Of Shares Expected To Be Issued Under Deferred Compensation Program For Directors IncrementalCommonSharesAttributableToDilutiveEffectOfSharesExpectedToBeIssuedUnderDeferredCompensationProgramForDirectors	2332
	ottr	Incremental Common Shares Attributable To Dilutive Effect Of Shares Expected To Be Issued Under Deferred Compensation Program For Directors IncrementalCommonSharesAttributableToDilutiveEffectOfSharesExpectedToBeIssuedUnderDeferredCompensationProgramForDirectors	1999
	ottr	Incremental Common Shares Attributable To Dilutive Effect Of Shares Expected To Be Issued Under Deferred Compensation Program For Directors IncrementalCommonSharesAttributableToDilutiveEffectOfSharesExpectedToBeIssuedUnderDeferredCompensationProgramForDirectors	2522
CY2019Q3	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	232067
CY2018Q3	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	282041
	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	227903
	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	289400
CY2019Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	39946739
CY2018Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	39903565
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	39922580
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	5245000	USD
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	3402000	USD
CY2019Q3	ottr	Employee Stock Purchase Plan Employee Discount EmployeeStockPurchasePlanEmployeeDiscount	0.15	pure
CY2019Q3	ottr	Employee Stock Purchase Plan Employee Discount EmployeeStockPurchasePlanEmployeeDiscount	0.15	pure
CY2019Q3	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	4300000	USD
	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P2Y1M6D
CY2019Q3	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	1301000	USD
CY2018Q3	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	1149000	USD
CY2019Q3	ottr	Operating Lease Rightofuse Asset Gross OperatingLeaseRightofuseAssetGross	24959000	USD
CY2019Q3	ottr	Operating Lease Rightofuse Asset Accumulated Amortization OperatingLeaseRightofuseAssetAccumulatedAmortization	3006000	USD
CY2019Q3	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	21953000	USD
CY2019Q3	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	4006000	USD
	us-gaap	Variable Lease Cost VariableLeaseCost	137000	USD
CY2019Q3	us-gaap	Operating Lease Liability OperatingLeaseLiability	22390000	USD
CY2019Q3	us-gaap	Operating Lease Cost OperatingLeaseCost	1331000	USD
CY2019Q3	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	18384000	USD
CY2019Q3	us-gaap	Lessee Operating Lease Liability Payments Remainder Of Fiscal Year LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear	1304000	USD
CY2019Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	4998000	USD
CY2019Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	4719000	USD
CY2019Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	3697000	USD
CY2019Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	3399000	USD
CY2019Q3	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	8427000	USD
CY2019Q3	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	26544000	USD
CY2019Q3	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	4154000	USD
CY2019Q3	us-gaap	Operating Lease Liability OperatingLeaseLiability	22390000	USD
CY2019Q3	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P6Y2M12D
CY2019Q3	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.053	pure
CY2018Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	20369000	USD
	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	5292000	USD
	ottr	Operating Lease Lease Modifications OperatingLeaseLeaseModifications	164000	USD
	us-gaap	Operating Lease Payments OperatingLeasePayments	3931000	USD
	ottr	Operating Lease Interest OperatingLeaseInterest	824000	USD
CY2019Q3	us-gaap	Operating Lease Liability OperatingLeaseLiability	22390000	USD
CY2019Q3	us-gaap	Variable Lease Cost VariableLeaseCost	64000	USD
CY2019Q3	ottr	Rightofuse Lease Cost RightofuseLeaseCost	1395000	USD
	us-gaap	Operating Lease Cost OperatingLeaseCost	4028000	USD
	ottr	Rightofuse Lease Cost RightofuseLeaseCost	4165000	USD
CY2018Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	18599000	USD
CY2018Q4	us-gaap	Long Term Debt LongTermDebt	592523000	USD
CY2018Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	172000	USD
CY2018Q4	us-gaap	Debt Instrument Unamortized Discount DebtInstrumentUnamortizedDiscount	2349000	USD
CY2018Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	590002000	USD
CY2018Q4	us-gaap	Debt Longterm And Shortterm Combined Amount DebtLongtermAndShorttermCombinedAmount	608773000	USD
CY2019Q3	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	300000000	USD
CY2019Q3	us-gaap	Line Of Credit LineOfCredit	108997000	USD
CY2019Q3	ottr	Line Of Credit Facility Amount Restricted LineOfCreditFacilityAmountRestricted	16561000	USD
CY2019Q3	us-gaap	Line Of Credit Facility Remaining Borrowing Capacity LineOfCreditFacilityRemainingBorrowingCapacity	174442000	USD
CY2018Q4	us-gaap	Line Of Credit Facility Remaining Borrowing Capacity LineOfCreditFacilityRemainingBorrowingCapacity	281101000	USD
CY2019Q3	us-gaap	Short Term Borrowings ShortTermBorrowings	108997000	USD
CY2019Q3	us-gaap	Long Term Debt LongTermDebt	592394000	USD
CY2019Q3	us-gaap	Long Term Debt Current LongTermDebtCurrent	180000	USD
CY2019Q3	us-gaap	Debt Instrument Unamortized Discount DebtInstrumentUnamortizedDiscount	2199000	USD
CY2019Q3	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	590015000	USD
CY2019Q3	us-gaap	Debt Longterm And Shortterm Combined Amount DebtLongtermAndShorttermCombinedAmount	699192000	USD
CY2019Q3	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	258000	USD
CY2018Q3	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	258000	USD
CY2019Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	29681000	USD
CY2018Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	30632000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	80402000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	82391000	USD
CY2019Q3	ottr	Income Tax Reconciliation Income Tax Expense Benefit At Federal And State Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalAndStateStatutoryIncomeTaxRate	7717000	USD
CY2018Q3	ottr	Income Tax Reconciliation Income Tax Expense Benefit At Federal And State Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalAndStateStatutoryIncomeTaxRate	7964000	USD
	ottr	Income Tax Reconciliation Income Tax Expense Benefit At Federal And State Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalAndStateStatutoryIncomeTaxRate	20905000	USD
	ottr	Income Tax Reconciliation Income Tax Expense Benefit At Federal And State Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalAndStateStatutoryIncomeTaxRate	21422000	USD
CY2019Q3	ottr	Income Tax Reconciliation Differences Reversing In Excess Of Federal Rates IncomeTaxReconciliationDifferencesReversingInExcessOfFederalRates	-933000	USD
CY2018Q3	ottr	Income Tax Reconciliation Differences Reversing In Excess Of Federal Rates IncomeTaxReconciliationDifferencesReversingInExcessOfFederalRates	-838000	USD
	ottr	Income Tax Reconciliation Differences Reversing In Excess Of Federal Rates IncomeTaxReconciliationDifferencesReversingInExcessOfFederalRates	-2690000	USD
	ottr	Income Tax Reconciliation Differences Reversing In Excess Of Federal Rates IncomeTaxReconciliationDifferencesReversingInExcessOfFederalRates	-2932000	USD
CY2019Q3	us-gaap	Income Tax Reconciliation Tax Credits Research IncomeTaxReconciliationTaxCreditsResearch	612000	USD
CY2018Q3	us-gaap	Income Tax Reconciliation Tax Credits Research IncomeTaxReconciliationTaxCreditsResearch	202000	USD
	us-gaap	Income Tax Reconciliation Tax Credits Research IncomeTaxReconciliationTaxCreditsResearch	987000	USD
	us-gaap	Income Tax Reconciliation Tax Credits Research IncomeTaxReconciliationTaxCreditsResearch	562000	USD
CY2019Q3	ottr	Effective Income Tax Rate Reconciliation Deduction Equity Method Stock Awards EffectiveIncomeTaxRateReconciliationDeductionEquityMethodStockAwards	-0	USD
CY2018Q3	ottr	Effective Income Tax Rate Reconciliation Deduction Equity Method Stock Awards EffectiveIncomeTaxRateReconciliationDeductionEquityMethodStockAwards	73000	USD
	ottr	Effective Income Tax Rate Reconciliation Deduction Equity Method Stock Awards EffectiveIncomeTaxRateReconciliationDeductionEquityMethodStockAwards	827000	USD
	ottr	Effective Income Tax Rate Reconciliation Deduction Equity Method Stock Awards EffectiveIncomeTaxRateReconciliationDeductionEquityMethodStockAwards	698000	USD
	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	774000	USD
	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	774000	USD
CY2019Q3	us-gaap	Income Tax Reconciliation Prior Year Income Taxes IncomeTaxReconciliationPriorYearIncomeTaxes	-688000	USD
CY2018Q3	us-gaap	Income Tax Reconciliation Prior Year Income Taxes IncomeTaxReconciliationPriorYearIncomeTaxes	2109000	USD
	us-gaap	Income Tax Reconciliation Prior Year Income Taxes IncomeTaxReconciliationPriorYearIncomeTaxes	-722000	USD
	us-gaap	Income Tax Reconciliation Prior Year Income Taxes IncomeTaxReconciliationPriorYearIncomeTaxes	2028000	USD
CY2019Q3	ottr	Effective Income Tax Rate Reconciliation Corporate Owned Life Insurance Amount EffectiveIncomeTaxRateReconciliationCorporateOwnedLifeInsuranceAmount	-50000	USD
CY2018Q3	ottr	Effective Income Tax Rate Reconciliation Corporate Owned Life Insurance Amount EffectiveIncomeTaxRateReconciliationCorporateOwnedLifeInsuranceAmount	-332000	USD
	ottr	Effective Income Tax Rate Reconciliation Corporate Owned Life Insurance Amount EffectiveIncomeTaxRateReconciliationCorporateOwnedLifeInsuranceAmount	-609000	USD
	ottr	Effective Income Tax Rate Reconciliation Corporate Owned Life Insurance Amount EffectiveIncomeTaxRateReconciliationCorporateOwnedLifeInsuranceAmount	-360000	USD
CY2019Q3	ottr	Income Tax Reconciliation Allowance For Funds Used During Construction IncomeTaxReconciliationAllowanceForFundsUsedDuringConstruction	239000	USD
CY2018Q3	ottr	Income Tax Reconciliation Allowance For Funds Used During Construction IncomeTaxReconciliationAllowanceForFundsUsedDuringConstruction	138000	USD
	ottr	Income Tax Reconciliation Allowance For Funds Used During Construction IncomeTaxReconciliationAllowanceForFundsUsedDuringConstruction	419000	USD
	ottr	Income Tax Reconciliation Allowance For Funds Used During Construction IncomeTaxReconciliationAllowanceForFundsUsedDuringConstruction	416000	USD
CY2019Q3	ottr	Income Tax Reconciliation Production Tax Credit IncomeTaxReconciliationProductionTaxCredit	-0	USD
CY2018Q3	ottr	Income Tax Reconciliation Production Tax Credit IncomeTaxReconciliationProductionTaxCredit	707000	USD
	ottr	Income Tax Reconciliation Production Tax Credit IncomeTaxReconciliationProductionTaxCredit	-0	USD
	ottr	Income Tax Reconciliation Production Tax Credit IncomeTaxReconciliationProductionTaxCredit	2757000	USD
CY2019Q3	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	0	USD
CY2018Q3	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	0	USD
	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	0	USD
	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	-531000	USD
CY2019Q3	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-1000	USD
CY2018Q3	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-166000	USD
	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	30000	USD
	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-213000	USD
	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	6000	USD
	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	153000	USD
	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	113000	USD
	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	170000	USD
	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	186000	USD
CY2019Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1302000	USD
CY2018Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	617000	USD
	ottr	Period For Unrecognized Tax Benefits Not Expected Change PeriodForUnrecognizedTaxBenefitsNotExpectedChange	P12M
CY2019Q3	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	0	USD
CY2019Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	4936000	USD
CY2018Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	7359000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	13907000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	14207000	USD
CY2019Q3	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.166	pure
CY2018Q3	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.240	pure
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.173	pure
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.172	pure
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1282000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	684000	USD
	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	37000	USD

Files In Submission

Name	View Source	Status
0001437749-19-022085-index-headers.html	Edgar Link	pending
0001437749-19-022085-index.html	Edgar Link	pending
0001437749-19-022085.txt	Edgar Link	pending
0001437749-19-022085-xbrl.zip	Edgar Link	pending
ex_162323.htm	Edgar Link	pending
ex_162324.htm	Edgar Link	pending
ex_162325.htm	Edgar Link	pending
ex_162326.htm	Edgar Link	pending
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Financial_Report.xlsx	Edgar Link	pending
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ottr-20190930.xsd	Edgar Link	pending
ottr-20190930_cal.xml	Edgar Link	unprocessable
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report.css	Edgar Link	pending
segment.jpg	Edgar Link	pending
Show.js	Edgar Link	pending

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$OTTR
Otter Tail Corp Stock $ottr

2019 Q4 Form 10-Q Financial Statement

#000143774919022085 Filed on November 08, 2019

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$OTTR Otter Tail Corp Stock $ottr

2019 Q4 Form 10-Q Financial Statement

#000143774919022085 Filed on November 08, 2019

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$OTTR
Otter Tail Corp Stock $ottr