$OTTR
Otter Tail Corp Stock $ottr

$ottr Overview Financials Valuation SEC Filings Company Website

2020 Q4 Form 10-Q Financial Statement

#000143774920022930 Filed on November 06, 2020

Income Statement

Concept	2020 Q4	2020 Q3	2019 Q4
Revenue	$226.8M	$235.8M	$215.7M
YoY Change	5.15%	3.11%	-2.49%
Cost Of Revenue	$98.40M	$100.3M	$95.10M
YoY Change	3.47%	-1.57%	-6.4%
Gross Profit	$128.4M	$135.5M	$120.6M
YoY Change	6.47%	6.86%	0.84%
Gross Profit Margin	56.61%	57.47%	55.91%
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$20.80M	$20.40M	$19.90M
YoY Change	4.52%	3.75%	7.57%
% of Gross Profit	16.2%	15.05%	16.5%
Operating Expenses	$100.5M	$82.70M	$89.30M
YoY Change	12.54%	-7.6%	-7.17%
Operating Profit	$27.90M	$52.73M	$31.30M
YoY Change	-10.86%	41.54%	33.76%
Interest Expense	-$9.100M	-$8.600M	-$8.200M
YoY Change	10.98%	14.67%	5.13%
% of Operating Profit	-32.62%	-16.31%	-26.2%
Other Income/Expense, Net	$1.500M	$1.712M	$900.0K
YoY Change	66.67%	67.84%	-181.82%
Pretax Income	$20.30M	$45.03M	$23.90M
YoY Change	-15.06%	51.72%	64.83%
Income Tax	$1.700M	$9.097M	$3.500M
% Of Pretax Income	8.37%	20.2%	14.64%
Net Earnings	$18.70M	$35.93M	$20.40M
YoY Change	-8.33%	45.22%	43.66%
Net Earnings / Revenue	8.25%	15.24%	9.46%
Basic Earnings Per Share		$0.88
Diluted Earnings Per Share	$451.7K	$0.87	$510.0K
COMMON SHARES
Basic Shares Outstanding	41.06M	40.91M shares	39.76M
Diluted Shares Outstanding		41.08M shares

Balance Sheet

Concept	2020 Q4	2020 Q3	2019 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments	$1.200M	$44.90M	$21.20M
YoY Change	-94.34%	4888.89%	2255.56%
Cash & Equivalents	$1.163M	$44.90M	$21.20M
Short-Term Investments
Other Short-Term Assets	$5.645M	$7.552M	$6.529M
YoY Change	-13.54%	9.04%	6.79%
Inventory	$92.17M	$81.87M	$97.85M
Prepaid Expenses
Receivables	$83.80M	$100.4M	$77.95M
Other Receivables	$9.000M	$6.322M	$8.773M
Total Short-Term Assets	$234.8M	$274.9M	$254.9M
YoY Change	-7.86%	15.68%	5.57%
LONG-TERM ASSETS
Property, Plant & Equipment	$2.049B	$1.993B	$1.754B
YoY Change	16.85%	17.77%	10.92%
Goodwill	$37.57M	$37.57M	$37.57M
YoY Change	0.0%	0.0%	0.0%
Intangibles	$10.14M	$10.42M	$11.29M
YoY Change	-10.15%	-9.89%	-9.32%
Long-Term Investments	$51.90M	$10.80M	$9.900M
YoY Change	424.24%	11.34%	10.0%
Other Assets	$26.28M	$42.32M	$26.57M
YoY Change	-1.07%	8.51%	-25.71%
Total Long-Term Assets	$2.344B	$2.260B	$2.019B
YoY Change	16.09%	16.32%	11.46%
TOTAL ASSETS
Total Short-Term Assets	$234.8M	$274.9M	$254.9M
Total Long-Term Assets	$2.344B	$2.260B	$2.019B
Total Assets	$2.578B	$2.535B	$2.274B
YoY Change	13.4%	16.25%	10.77%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$120.6M	$189.3M	$120.8M
YoY Change	-0.13%	111.87%	25.43%
Accrued Expenses	$49.40M	$34.40M	$37.80M
YoY Change	30.69%	12.42%	2.16%
Deferred Revenue
YoY Change
Short-Term Debt	$81.00M	$48.60M	$6.000M
YoY Change	1249.95%	-55.41%	-67.74%
Long-Term Debt Due	$140.1M	$215.0K	$183.0K
YoY Change	76450.27%	19.44%	6.4%
Total Short-Term Liabilities	$436.8M	$299.7M	$189.7M
YoY Change	130.2%	18.39%	11.55%
LONG-TERM LIABILITIES
Long-Term Debt	$624.4M	$764.3M	$689.6M
YoY Change	-9.45%	29.53%	16.88%
Other Long-Term Liabilities	$60.00M	$35.15M	$51.91M
YoY Change	15.59%	24.94%	113.4%
Total Long-Term Liabilities	$646.2M	$799.4M	$612.8M
YoY Change	5.45%	29.33%	-0.25%
TOTAL LIABILITIES
Total Short-Term Liabilities	$436.8M	$299.7M	$189.7M
Total Long-Term Liabilities	$646.2M	$799.4M	$612.8M
Total Liabilities	$1.083B	$1.099B	$802.5M
YoY Change	34.94%	26.15%	2.31%
SHAREHOLDERS EQUITY
Retained Earnings	$257.9M	$254.5M	$222.3M
YoY Change	15.98%	17.85%	16.76%
Common Stock	$621.6M	$603.6M	$565.6M
YoY Change	9.9%	10.73%	4.24%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$871.0M	$852.1M	$781.5M
YoY Change
Total Liabilities & Shareholders Equity	$2.578B	$2.535B	$2.274B
YoY Change	13.4%	16.25%	10.77%

Cashflow Statement

Concept	2020 Q4	2020 Q3	2019 Q4
OPERATING ACTIVITIES
Net Income	$18.70M	$35.93M	$20.40M
YoY Change	-8.33%	45.22%	43.66%
Depreciation, Depletion And Amortization	$20.80M	$20.40M	$19.90M
YoY Change	4.52%	3.75%	7.57%
Cash From Operating Activities	$70.60M	$67.40M	$79.90M
YoY Change	-11.64%	88.27%	88.0%
INVESTING ACTIVITIES
Capital Expenditures	-$151.0M	-$100.8M	-$57.70M
YoY Change	161.7%	5.33%	86.73%
Acquisitions
YoY Change
Other Investing Activities	-$2.300M	-$600.0K	-$700.0K
YoY Change	228.57%		16.67%
Cash From Investing Activities	-$153.3M	-$101.4M	-$58.40M
YoY Change	162.5%	5.96%	85.4%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	38.90M	39.40M	-1.200M
YoY Change	-3341.67%	-34.11%	-88.99%
NET CHANGE
Cash From Operating Activities	70.60M	67.40M	79.90M
Cash From Investing Activities	-153.3M	-101.4M	-58.40M
Cash From Financing Activities	38.90M	39.40M	-1.200M
Net Change In Cash	-43.80M	5.400M	20.30M
YoY Change	-315.76%	-5500.0%	20200.0%
FREE CASH FLOW
Cash From Operating Activities	$70.60M	$67.40M	$79.90M
Capital Expenditures	-$151.0M	-$100.8M	-$57.70M
Free Cash Flow	$221.6M	$168.2M	$137.6M
YoY Change	61.05%	27.91%	87.47%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2020Q3	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	16409000	USD
CY2019Q4	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	20911000	USD
CY2020Q4	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	41064051
CY2020Q3	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2019Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2020Q3	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	5
CY2019Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	5
CY2020Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	50000000
CY2019Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	50000000
CY2020Q3	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	41052165
CY2019Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	40157591
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.11
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.05
CY2020Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	44904000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	21199000	USD
CY2020Q3	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	100423000	USD
CY2019Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	77947000	USD
CY2020Q3	us-gaap	Other Receivables Net Current OtherReceivablesNetCurrent	6322000	USD
CY2019Q4	us-gaap	Other Receivables Net Current OtherReceivablesNetCurrent	8773000	USD
CY2020Q3	us-gaap	Inventory Net InventoryNet	81871000	USD
CY2019Q4	us-gaap	Inventory Net InventoryNet	97851000	USD
CY2020Q3	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	0	USD
CY2019Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	1487000	USD
CY2019Q4	us-gaap	Liabilities Current LiabilitiesCurrent	189741000	USD
CY2020Q3	us-gaap	Defined Benefit Pension Plan Liabilities Noncurrent DefinedBenefitPensionPlanLiabilitiesNoncurrent	86101000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	2645478000	USD
CY2020Q3	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	939590000	USD
CY2019Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	891684000	USD
CY2020Q3	us-gaap	Other Postretirement Defined Benefit Plan Liabilities Noncurrent OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent	72508000	USD
CY2020Q3	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	17435000	USD
CY2019Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	21650000	USD
CY2020Q3	us-gaap	Other Assets Current OtherAssetsCurrent	7552000	USD
CY2019Q4	us-gaap	Other Assets Current OtherAssetsCurrent	5042000	USD
CY2020Q3	us-gaap	Assets Current AssetsCurrent	274916000	USD
CY2019Q4	us-gaap	Assets Current AssetsCurrent	254860000	USD
CY2020Q3	us-gaap	Long Term Investments LongTermInvestments	10791000	USD
CY2019Q4	us-gaap	Long Term Investments LongTermInvestments	9894000	USD
CY2020Q3	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	42316000	USD
CY2019Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	40196000	USD
CY2020Q3	us-gaap	Goodwill Goodwill	37572000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	37572000	USD
CY2020Q3	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	10419000	USD
CY2019Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	11290000	USD
CY2020Q3	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	145977000	USD
CY2019Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	144138000	USD
CY2020Q3	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	19713000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	21851000	USD
CY2020Q3	ottr	Public Utilities Property Plant And Equipment Electric PublicUtilitiesPropertyPlantAndEquipmentElectric	2221785000	USD
CY2019Q4	ottr	Public Utilities Property Plant And Equipment Electric PublicUtilitiesPropertyPlantAndEquipmentElectric	2212884000	USD
CY2020Q3	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	256480000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	247356000	USD
CY2020Q3	us-gaap	Construction In Progress Gross ConstructionInProgressGross	454128000	USD
CY2019Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	185238000	USD
CY2020Q3	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	2932393000	USD
CY2020Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1992803000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1753794000	USD
CY2020Q3	us-gaap	Assets Assets	2534507000	USD
CY2019Q4	us-gaap	Assets Assets	2273595000	USD
CY2020Q3	us-gaap	Short Term Borrowings ShortTermBorrowings	48600000	USD
CY2019Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	6000000	USD
CY2020Q3	us-gaap	Long Term Debt Current LongTermDebtCurrent	215000	USD
CY2019Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	183000	USD
CY2020Q3	us-gaap	Accounts Payable Current AccountsPayableCurrent	189327000	USD
CY2019Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	120775000	USD
CY2020Q3	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	20933000	USD
CY2019Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	22730000	USD
CY2020Q3	us-gaap	Accrual For Taxes Other Than Income Taxes Current AccrualForTaxesOtherThanIncomeTaxesCurrent	14283000	USD
CY2019Q4	us-gaap	Accrual For Taxes Other Than Income Taxes Current AccrualForTaxesOtherThanIncomeTaxesCurrent	17525000	USD
CY2020Q3	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	12870000	USD
CY2019Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	7480000	USD
CY2020Q3	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	4581000	USD
CY2019Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	4136000	USD
CY2020Q3	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	8927000	USD
CY2019Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	10912000	USD
CY2020Q3	us-gaap	Liabilities Current LiabilitiesCurrent	299736000	USD
CY2019Q4	us-gaap	Defined Benefit Pension Plan Liabilities Noncurrent DefinedBenefitPensionPlanLiabilitiesNoncurrent	98970000	USD
CY2020Q3	us-gaap	Common Stock Value CommonStockValue	205261000	USD
CY2019Q4	us-gaap	Common Stock Value CommonStockValue	200788000	USD
CY2020Q3	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	398301000	USD
CY2019Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	364790000	USD
CY2020Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	254468000	USD
CY2019Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	222341000	USD
CY2020Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-5960000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-6437000	USD
CY2020Q3	us-gaap	Stockholders Equity StockholdersEquity	852070000	USD
	us-gaap	Utilities Operating Expense Products And Services UtilitiesOperatingExpenseProductsAndServices	246567000	USD
	us-gaap	Utilities Operating Expense Products And Services UtilitiesOperatingExpenseProductsAndServices	277325000	USD
CY2020Q3	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	764274000	USD
CY2019Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	689581000	USD
CY2020Q3	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	13615000	USD
CY2019Q3	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	11665000	USD
CY2019Q4	us-gaap	Other Postretirement Defined Benefit Plan Liabilities Noncurrent OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent	71437000	USD
CY2020Q3	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	15778000	USD
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	18193000	USD
CY2020Q3	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	35146000	USD
CY2019Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	30833000	USD
CY2020Q3	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	152448000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	131941000	USD
CY2020Q3	us-gaap	Accumulated Deferred Investment Tax Credit AccumulatedDeferredInvestmentTaxCredit	17640000	USD
CY2019Q4	us-gaap	Accumulated Deferred Investment Tax Credit AccumulatedDeferredInvestmentTaxCredit	18626000	USD
CY2020Q3	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	236892000	USD
CY2019Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	239906000	USD
CY2020Q3	ottr	Other Contracts With Customer Liability Noncurrent OtherContractsWithCustomerLiabilityNoncurrent	1914000	USD
CY2019Q4	ottr	Other Contracts With Customer Liability Noncurrent OtherContractsWithCustomerLiabilityNoncurrent	2885000	USD
CY2020Q3	ottr	Total Deferred Credits And Liabilities TotalDeferredCreditsAndLiabilities	408894000	USD
CY2019Q4	ottr	Total Deferred Credits And Liabilities TotalDeferredCreditsAndLiabilities	393358000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	781482000	USD
CY2020Q3	us-gaap	Capitalization Longterm Debt And Equity CapitalizationLongtermDebtAndEquity	1616344000	USD
CY2019Q4	us-gaap	Capitalization Longterm Debt And Equity CapitalizationLongtermDebtAndEquity	1471063000	USD
CY2020Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	2534507000	USD
CY2019Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	2273595000	USD
CY2020Q3	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	235755000	USD
CY2019Q3	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	228652000	USD
	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	663258000	USD
	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	703827000	USD
CY2020Q3	us-gaap	Utilities Operating Expense Fuel Used UtilitiesOperatingExpenseFuelUsed	11554000	USD
CY2019Q3	us-gaap	Utilities Operating Expense Fuel Used UtilitiesOperatingExpenseFuelUsed	18331000	USD
	us-gaap	Utilities Operating Expense Fuel Used UtilitiesOperatingExpenseFuelUsed	34077000	USD
	us-gaap	Utilities Operating Expense Fuel Used UtilitiesOperatingExpenseFuelUsed	45547000	USD
CY2020Q3	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	32845000	USD
CY2019Q3	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	35869000	USD
	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	106639000	USD
	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	114107000	USD
CY2020Q3	us-gaap	Utilities Operating Expense Products And Services UtilitiesOperatingExpenseProductsAndServices	86856000	USD
CY2019Q3	us-gaap	Utilities Operating Expense Products And Services UtilitiesOperatingExpenseProductsAndServices	88747000	USD
	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	36277000	USD
	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	38404000	USD
CY2020Q3	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	20395000	USD
	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	3114000	USD
	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	3733000	USD
CY2019Q3	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	19657000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	61230000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	58229000	USD
CY2020Q3	us-gaap	Utilities Operating Expense Other UtilitiesOperatingExpenseOther	4333000	USD
CY2019Q3	us-gaap	Utilities Operating Expense Other UtilitiesOperatingExpenseOther	3965000	USD
	us-gaap	Utilities Operating Expense Other UtilitiesOperatingExpenseOther	12601000	USD
	us-gaap	Utilities Operating Expense Other UtilitiesOperatingExpenseOther	11824000	USD
CY2020Q3	us-gaap	Costs And Expenses CostsAndExpenses	183026000	USD
CY2019Q3	us-gaap	Costs And Expenses CostsAndExpenses	191397000	USD
	us-gaap	Costs And Expenses CostsAndExpenses	543331000	USD
	us-gaap	Costs And Expenses CostsAndExpenses	600184000	USD
CY2020Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	52729000	USD
CY2019Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	37255000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	119927000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	103643000	USD
CY2020Q3	us-gaap	Interest And Debt Expense InterestAndDebtExpense	8568000	USD
CY2019Q3	us-gaap	Interest And Debt Expense InterestAndDebtExpense	7539000	USD
	us-gaap	Interest And Debt Expense InterestAndDebtExpense	25353000	USD
	us-gaap	Interest And Debt Expense InterestAndDebtExpense	23190000	USD
CY2020Q3	us-gaap	Net Periodic Defined Benefits Expense Reversal Of Expense Excluding Service Cost Component NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent	842000	USD
CY2019Q3	us-gaap	Net Periodic Defined Benefits Expense Reversal Of Expense Excluding Service Cost Component NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent	1055000	USD
	us-gaap	Net Periodic Defined Benefits Expense Reversal Of Expense Excluding Service Cost Component NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent	2581000	USD
	us-gaap	Net Periodic Defined Benefits Expense Reversal Of Expense Excluding Service Cost Component NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent	3165000	USD
CY2020Q3	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	1712000	USD
CY2019Q3	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	1020000	USD
CY2020Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	45031000	USD
CY2019Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	29681000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	95726000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	80402000	USD
CY2020Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	9097000	USD
CY2019Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	4936000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	18543000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	13907000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	35934000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	24745000	USD
	us-gaap	Net Income Loss NetIncomeLoss	77183000	USD
	us-gaap	Net Income Loss NetIncomeLoss	66495000	USD
CY2020Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	40913972
CY2019Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	39714672
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	40548133
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	39694677
CY2020Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	41077689
CY2019Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	39946739
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	40732928
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	39922580
CY2020Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.88
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.62
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.90
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.68
CY2020Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.87
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.62
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.89
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	5000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-13000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	30000	USD
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.67
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	35934000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	24745000	USD
	us-gaap	Net Income Loss NetIncomeLoss	77183000	USD
	us-gaap	Net Income Loss NetIncomeLoss	66495000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	21000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	1000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	-13000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	205000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	187000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-7000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	6000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	46000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	38000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-27000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	23000	USD
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	172000	USD
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	144000	USD
CY2020Q3	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	138000	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
	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	413000	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
CY2020Q3	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-36000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-34000	USD
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-108000	USD
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-101000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-102000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-96000	USD
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-305000	USD
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-288000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	75000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	119000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	477000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	432000	USD
CY2020Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	36009000	USD
CY2019Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	24864000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	77660000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	66927000	USD
CY2020Q2	us-gaap	Stockholders Equity StockholdersEquity	822055000	USD
CY2020Q3	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	7902000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	35934000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	75000	USD
CY2020Q3	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	1275000	USD
CY2020Q3	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	15171000	USD
CY2020Q3	us-gaap	Stockholders Equity StockholdersEquity	852070000	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
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	781482000	USD
	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	34771000	USD
	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	2069000	USD
	us-gaap	Net Income Loss NetIncomeLoss	77183000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	477000	USD
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	5282000	USD
	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	45056000	USD
CY2020Q3	us-gaap	Stockholders Equity StockholdersEquity	852070000	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
	us-gaap	Net Income Loss NetIncomeLoss	77183000	USD
	us-gaap	Net Income Loss NetIncomeLoss	66495000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	61230000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	58229000	USD
	us-gaap	Income Tax Credits And Adjustments IncomeTaxCreditsAndAdjustments	-986000	USD
	us-gaap	Income Tax Credits And Adjustments IncomeTaxCreditsAndAdjustments	-1011000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	20353000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	3487000	USD
	ottr	Increase Decrease In Deferred Charges And Other Assets IncreaseDecreaseInDeferredChargesAndOtherAssets	3439000	USD
	ottr	Increase Decrease In Deferred Charges And Other Assets IncreaseDecreaseInDeferredChargesAndOtherAssets	7142000	USD
	us-gaap	Pension Contributions PensionContributions	11200000	USD
	us-gaap	Pension Contributions PensionContributions	22500000	USD
	ottr	Increase Decrease In Other Operating Liabilities And Increase Decrease In Deferred Liabilities IncreaseDecreaseInOtherOperatingLiabilitiesAndIncreaseDecreaseInDeferredLiabilities	-3237000	USD
	ottr	Increase Decrease In Other Operating Liabilities And Increase Decrease In Deferred Liabilities IncreaseDecreaseInOtherOperatingLiabilitiesAndIncreaseDecreaseInDeferredLiabilities	-10344000	USD
	us-gaap	Increase Decrease In Allowance For Equity Funds Used During Construction IncreaseDecreaseInAllowanceForEquityFundsUsedDuringConstruction	3104000	USD
	us-gaap	Increase Decrease In Allowance For Equity Funds Used During Construction IncreaseDecreaseInAllowanceForEquityFundsUsedDuringConstruction	1602000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	5282000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	5245000	USD
	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	176000	USD
	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-312000	USD
	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	20025000	USD
	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	16213000	USD
	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-15980000	USD
	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-9218000	USD
	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-2023000	USD
	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-2974000	USD
	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-12063000	USD
	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-20744000	USD
	ottr	Increase Decrease In Interest Payable And Income Taxes Receivable Payable Net IncreaseDecreaseInInterestPayableAndIncomeTaxesReceivablePayableNet	103000	USD
	ottr	Increase Decrease In Interest Payable And Income Taxes Receivable Payable Net IncreaseDecreaseInInterestPayableAndIncomeTaxesReceivablePayableNet	3773000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	141276000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	105149000	USD
	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	220630000	USD
	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	149695000	USD
	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	4617000	USD
	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	4111000	USD
	us-gaap	Payments For Proceeds From Investments PaymentsForProceedsFromInvestments	6372000	USD
	us-gaap	Payments For Proceeds From Investments PaymentsForProceedsFromInvestments	5546000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-222385000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-151130000	USD
	ottr	Change In Checks Written In Excess Of Cash ChangeInChecksWrittenInExcessOfCash	-90000	USD
	ottr	Change In Checks Written In Excess Of Cash ChangeInChecksWrittenInExcessOfCash	-383000	USD
	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	42600000	USD
	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	90398000	USD
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	35219000	USD
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	USD
	us-gaap	Payments Of Stock Issuance Costs PaymentsOfStockIssuanceCosts	465000	USD
	us-gaap	Payments Of Stock Issuance Costs PaymentsOfStockIssuanceCosts	35000	USD
	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	2069000	USD
	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	2730000	USD
	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	75000000	USD
	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	0	USD
	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	369000	USD
	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	66000	USD
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	136000	USD
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	128000	USD
	us-gaap	Payments Of Dividends PaymentsOfDividends	45056000	USD
	us-gaap	Payments Of Dividends PaymentsOfDividends	41781000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	104814000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	46041000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	23705000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	60000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	21199000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	861000	USD
CY2020Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	44904000	USD
CY2019Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	921000	USD
CY2020Q3	us-gaap	Inventory Finished Goods Net Of Reserves InventoryFinishedGoodsNetOfReserves	18901000	USD
CY2019Q4	us-gaap	Inventory Finished Goods Net Of Reserves InventoryFinishedGoodsNetOfReserves	31863000	USD
CY2020Q3	us-gaap	Inventory Work In Process InventoryWorkInProcess	14480000	USD
CY2020Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	284000	USD
CY2019Q4	us-gaap	Inventory Work In Process InventoryWorkInProcess	16508000	USD
CY2020Q3	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	48490000	USD
CY2019Q4	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	49480000	USD
CY2020Q3	us-gaap	Inventory Net InventoryNet	81871000	USD
CY2019Q4	us-gaap	Inventory Net InventoryNet	97851000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	22517000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	12098000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	10419000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	22670000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	11380000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	11290000	USD
CY2019Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	296000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	871000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	888000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Remainder Of Fiscal Year FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear	275000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	1100000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	1100000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	1100000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	1100000	USD
CY2020Q3	ottr	Accounts Payable Outstanding Related To Capital Additions AccountsPayableOutstandingRelatedToCapitalAdditions	112314000	USD
CY2019Q3	ottr	Accounts Payable Outstanding Related To Capital Additions AccountsPayableOutstandingRelatedToCapitalAdditions	15893000	USD
CY2020Q2	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	2100000	USD
CY2019Q2	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	1691000	USD
CY2019Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	1339000	USD
CY2018Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	1407000	USD
CY2020Q3	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	474000	USD
CY2019Q3	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	86000	USD
	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	1845000	USD
	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	549000	USD
CY2020Q3	us-gaap	Allowance For Doubtful Accounts Receivable Write Offs AllowanceForDoubtfulAccountsReceivableWriteOffs	313000	USD
CY2019Q3	us-gaap	Allowance For Doubtful Accounts Receivable Write Offs AllowanceForDoubtfulAccountsReceivableWriteOffs	225000	USD
	us-gaap	Allowance For Doubtful Accounts Receivable Write Offs AllowanceForDoubtfulAccountsReceivableWriteOffs	923000	USD
	us-gaap	Allowance For Doubtful Accounts Receivable Write Offs AllowanceForDoubtfulAccountsReceivableWriteOffs	404000	USD
CY2020Q3	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	2261000	USD
CY2019Q3	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	1552000	USD
CY2020Q3	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	2261000	USD
CY2019Q3	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	1552000	USD
	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	3	pure
CY2020Q3	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	235755000	USD
CY2019Q3	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	228652000	USD
	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	663258000	USD
	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	703827000	USD
CY2020Q3	us-gaap	Interest And Debt Expense InterestAndDebtExpense	8568000	USD
CY2019Q3	us-gaap	Interest And Debt Expense InterestAndDebtExpense	7539000	USD
	us-gaap	Interest And Debt Expense InterestAndDebtExpense	25353000	USD
	us-gaap	Interest And Debt Expense InterestAndDebtExpense	23190000	USD
CY2020Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	9097000	USD
CY2019Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	4936000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	18543000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	13907000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	35934000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	24745000	USD
	us-gaap	Net Income Loss NetIncomeLoss	77183000	USD
	us-gaap	Net Income Loss NetIncomeLoss	66495000	USD
CY2020Q3	us-gaap	Assets Assets	2534507000	USD
CY2019Q4	us-gaap	Assets Assets	2273595000	USD
CY2020Q3	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	17435000	USD
CY2020Q3	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	145977000	USD
CY2020Q3	us-gaap	Regulatory Assets RegulatoryAssets	163412000	USD
CY2020Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	40913972
CY2019Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	39714672
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	40548133
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	39694677
CY2020Q3	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	98012
CY2019Q3	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	149023
CY2020Q3	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	12870000	USD
CY2020Q3	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	236892000	USD
CY2020Q3	us-gaap	Regulatory Liabilities RegulatoryLiabilities	249762000	USD
CY2020Q3	ottr	Net Regulatory Assets Liability Current NetRegulatoryAssetsLiabilityCurrent	4565000	USD
CY2020Q3	ottr	Net Regulatory Assets Liability Noncurrent NetRegulatoryAssetsLiabilityNoncurrent	-90915000	USD
CY2020Q3	us-gaap	Net Regulatory Assets NetRegulatoryAssets	-86350000	USD
CY2019Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	21650000	USD
CY2019Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	144138000	USD
CY2019Q4	us-gaap	Regulatory Assets RegulatoryAssets	165788000	USD
CY2019Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	7480000	USD
CY2019Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	239906000	USD
CY2019Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	247386000	USD
CY2019Q4	ottr	Net Regulatory Assets Liability Current NetRegulatoryAssetsLiabilityCurrent	14170000	USD
CY2019Q4	ottr	Net Regulatory Assets Liability Noncurrent NetRegulatoryAssetsLiabilityNoncurrent	-95768000	USD
CY2019Q4	us-gaap	Net Regulatory Assets NetRegulatoryAssets	-81598000	USD
	us-gaap	Stock Issued During Period Shares Dividend Reinvestment Plan StockIssuedDuringPeriodSharesDividendReinvestmentPlan	102042
	ottr	Stock Issued During Period Shares For Cash Invested Under Dividend Reinvestment And Share Purchase Plan StockIssuedDuringPeriodSharesForCashInvestedUnderDividendReinvestmentAndSharePurchasePlan	88636
	ottr	Stock Issued During Period Shares Vesting Of Restricted Stock Units StockIssuedDuringPeriodSharesVestingOfRestrictedStockUnits	35720
	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	29894
	ottr	Stock Issued During Period Shares Employee Stock Purchase Plans Dividends Reinvested StockIssuedDuringPeriodSharesEmployeeStockPurchasePlansDividendsReinvested	7906
	us-gaap	Stock Issued During Period Shares Restricted Stock Award Gross StockIssuedDuringPeriodSharesRestrictedStockAwardGross	17400
	ottr	Directors Deferred Compensation DirectorsDeferredCompensation	612
	ottr	Shares Withheld For Individual Income Tax Requirements SharesWithheldForIndividualIncomeTaxRequirements	38217
CY2020Q3	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	41052165
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	107017
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	147106
CY2020Q3	ottr	Incremental Common Shares Attributable To Dilutive Effect Of Underlying Shares Related To Nonvested Restricted Stock Units Granted To Employees IncrementalCommonSharesAttributableToDilutiveEffectOfUnderlyingSharesRelatedToNonvestedRestrictedStockUnitsGrantedToEmployees	48682
CY2019Q3	ottr	Incremental Common Shares Attributable To Dilutive Effect Of Underlying Shares Related To Nonvested Restricted Stock Units Granted To Employees IncrementalCommonSharesAttributableToDilutiveEffectOfUnderlyingSharesRelatedToNonvestedRestrictedStockUnitsGrantedToEmployees	68138
	ottr	Incremental Common Shares Attributable To Dilutive Effect Of Underlying Shares Related To Nonvested Restricted Stock Units Granted To Employees IncrementalCommonSharesAttributableToDilutiveEffectOfUnderlyingSharesRelatedToNonvestedRestrictedStockUnitsGrantedToEmployees	53303
	ottr	Incremental Common Shares Attributable To Dilutive Effect Of Underlying Shares Related To Nonvested Restricted Stock Units Granted To Employees IncrementalCommonSharesAttributableToDilutiveEffectOfUnderlyingSharesRelatedToNonvestedRestrictedStockUnitsGrantedToEmployees	63902
CY2020Q3	ottr	Incremental Common Shares Attributable To Sharebased Payment Arrangements Employee Stock Purchase Plans IncrementalCommonSharesAttributableToSharebasedPaymentArrangementsEmployeeStockPurchasePlans	13182
CY2019Q3	ottr	Incremental Common Shares Attributable To Sharebased Payment Arrangements Employee Stock Purchase Plans IncrementalCommonSharesAttributableToSharebasedPaymentArrangementsEmployeeStockPurchasePlans	0
	ottr	Incremental Common Shares Attributable To Sharebased Payment Arrangements Employee Stock Purchase Plans IncrementalCommonSharesAttributableToSharebasedPaymentArrangementsEmployeeStockPurchasePlans	14997
	ottr	Incremental Common Shares Attributable To Sharebased Payment Arrangements Employee Stock Purchase Plans IncrementalCommonSharesAttributableToSharebasedPaymentArrangementsEmployeeStockPurchasePlans	0
CY2020Q3	ottr	Incremental Common Shares Attributable To Dilutive Effect Of Nonvested Restricted Shares IncrementalCommonSharesAttributableToDilutiveEffectOfNonvestedRestrictedShares	2603
CY2019Q3	ottr	Incremental Common Shares Attributable To Dilutive Effect Of Nonvested Restricted Shares IncrementalCommonSharesAttributableToDilutiveEffectOfNonvestedRestrictedShares	13107
	ottr	Incremental Common Shares Attributable To Dilutive Effect Of Nonvested Restricted Shares IncrementalCommonSharesAttributableToDilutiveEffectOfNonvestedRestrictedShares	8033
	ottr	Incremental Common Shares Attributable To Dilutive Effect Of Nonvested Restricted Shares IncrementalCommonSharesAttributableToDilutiveEffectOfNonvestedRestrictedShares	14896
CY2020Q3	ottr	Incremental Common Shares Attributable To Dilutive Effect Of Shares Expected To Be Issued Under Deferred Compensation Program For Directors IncrementalCommonSharesAttributableToDilutiveEffectOfSharesExpectedToBeIssuedUnderDeferredCompensationProgramForDirectors	1238
CY2019Q3	ottr	Incremental Common Shares Attributable To Dilutive Effect Of Shares Expected To Be Issued Under Deferred Compensation Program For Directors IncrementalCommonSharesAttributableToDilutiveEffectOfSharesExpectedToBeIssuedUnderDeferredCompensationProgramForDirectors	1799
	ottr	Incremental Common Shares Attributable To Dilutive Effect Of Shares Expected To Be Issued Under Deferred Compensation Program For Directors IncrementalCommonSharesAttributableToDilutiveEffectOfSharesExpectedToBeIssuedUnderDeferredCompensationProgramForDirectors	1445
	ottr	Incremental Common Shares Attributable To Dilutive Effect Of Shares Expected To Be Issued Under Deferred Compensation Program For Directors IncrementalCommonSharesAttributableToDilutiveEffectOfSharesExpectedToBeIssuedUnderDeferredCompensationProgramForDirectors	1999
CY2020Q3	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	163717
CY2019Q3	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	232067
	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	184795
	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	227903
CY2020Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	41077689
CY2019Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	39946739
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	40732928
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	39922580
CY2020Q3	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	3900000	USD
	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P1Y10M24D
CY2020Q3	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	1275000	USD
CY2019Q3	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	1301000	USD
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	5282000	USD
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	5245000	USD
CY2020Q3	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	340000000	USD
CY2020Q3	us-gaap	Line Of Credit LineOfCredit	48600000	USD
CY2020Q3	ottr	Line Of Credit Facility Amount Restricted LineOfCreditFacilityAmountRestricted	7670000	USD
CY2020Q3	us-gaap	Line Of Credit Facility Remaining Borrowing Capacity LineOfCreditFacilityRemainingBorrowingCapacity	283730000	USD
CY2019Q4	us-gaap	Line Of Credit Facility Remaining Borrowing Capacity LineOfCreditFacilityRemainingBorrowingCapacity	318524000	USD
CY2020Q3	us-gaap	Short Term Borrowings ShortTermBorrowings	48600000	USD
CY2020Q3	us-gaap	Long Term Debt LongTermDebt	767215000	USD
CY2020Q3	us-gaap	Long Term Debt Current LongTermDebtCurrent	215000	USD
CY2020Q3	us-gaap	Debt Instrument Unamortized Discount DebtInstrumentUnamortizedDiscount	2726000	USD
CY2020Q3	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	764274000	USD
CY2020Q3	us-gaap	Debt Longterm And Shortterm Combined Amount DebtLongtermAndShorttermCombinedAmount	813089000	USD
CY2019Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	6000000	USD
CY2019Q4	us-gaap	Long Term Debt LongTermDebt	692351000	USD
CY2019Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	183000	USD
CY2019Q4	us-gaap	Debt Instrument Unamortized Discount DebtInstrumentUnamortizedDiscount	2587000	USD
CY2019Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	689581000	USD
CY2019Q4	us-gaap	Debt Longterm And Shortterm Combined Amount DebtLongtermAndShorttermCombinedAmount	695764000	USD
CY2019Q3	ottr	Income Tax Reconciliation Income Tax Expense Benefit At Federal And State Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalAndStateStatutoryIncomeTaxRate	7717000	USD
	ottr	Income Tax Reconciliation Income Tax Expense Benefit At Federal And State Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalAndStateStatutoryIncomeTaxRate	24889000	USD
	ottr	Income Tax Reconciliation Income Tax Expense Benefit At Federal And State Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalAndStateStatutoryIncomeTaxRate	20905000	USD
CY2020Q3	ottr	Income Tax Reconciliation Differences Reversing In Excess Of Federal Rates IncomeTaxReconciliationDifferencesReversingInExcessOfFederalRates	-1678000	USD
CY2019Q3	ottr	Income Tax Reconciliation Differences Reversing In Excess Of Federal Rates IncomeTaxReconciliationDifferencesReversingInExcessOfFederalRates	-933000	USD
	ottr	Income Tax Reconciliation Differences Reversing In Excess Of Federal Rates IncomeTaxReconciliationDifferencesReversingInExcessOfFederalRates	-3450000	USD
	ottr	Income Tax Reconciliation Differences Reversing In Excess Of Federal Rates IncomeTaxReconciliationDifferencesReversingInExcessOfFederalRates	-2690000	USD
CY2020Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	45031000	USD
CY2019Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	29681000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	95726000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	80402000	USD
CY2020Q3	ottr	Income Tax Reconciliation Income Tax Expense Benefit At Federal And State Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalAndStateStatutoryIncomeTaxRate	11708000	USD
CY2020Q3	ottr	Income Tax Reconciliation Allowance For Funds Used During Construction IncomeTaxReconciliationAllowanceForFundsUsedDuringConstruction	388000	USD
CY2019Q3	ottr	Income Tax Reconciliation Allowance For Funds Used During Construction IncomeTaxReconciliationAllowanceForFundsUsedDuringConstruction	239000	USD
	ottr	Income Tax Reconciliation Allowance For Funds Used During Construction IncomeTaxReconciliationAllowanceForFundsUsedDuringConstruction	948000	USD
	ottr	Income Tax Reconciliation Allowance For Funds Used During Construction IncomeTaxReconciliationAllowanceForFundsUsedDuringConstruction	419000	USD
CY2020Q3	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	259000	USD
CY2019Q3	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	258000	USD
	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	775000	USD
	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	774000	USD
CY2020Q3	us-gaap	Income Tax Reconciliation Tax Credits Research IncomeTaxReconciliationTaxCreditsResearch	263000	USD
CY2019Q3	us-gaap	Income Tax Reconciliation Tax Credits Research IncomeTaxReconciliationTaxCreditsResearch	612000	USD
	us-gaap	Income Tax Reconciliation Tax Credits Research IncomeTaxReconciliationTaxCreditsResearch	649000	USD
	us-gaap	Income Tax Reconciliation Tax Credits Research IncomeTaxReconciliationTaxCreditsResearch	987000	USD
CY2020Q3	ottr	Effective Income Tax Rate Reconciliation Deduction Equity Method Stock Awards EffectiveIncomeTaxRateReconciliationDeductionEquityMethodStockAwards	-0	USD
CY2019Q3	ottr	Effective Income Tax Rate Reconciliation Deduction Equity Method Stock Awards EffectiveIncomeTaxRateReconciliationDeductionEquityMethodStockAwards	-0	USD
	ottr	Effective Income Tax Rate Reconciliation Deduction Equity Method Stock Awards EffectiveIncomeTaxRateReconciliationDeductionEquityMethodStockAwards	535000	USD
	ottr	Effective Income Tax Rate Reconciliation Deduction Equity Method Stock Awards EffectiveIncomeTaxRateReconciliationDeductionEquityMethodStockAwards	827000	USD
CY2020Q3	ottr	Effective Income Tax Rate Reconciliation Corporate Owned Life Insurance Amount EffectiveIncomeTaxRateReconciliationCorporateOwnedLifeInsuranceAmount	-155000	USD
CY2019Q3	ottr	Effective Income Tax Rate Reconciliation Corporate Owned Life Insurance Amount EffectiveIncomeTaxRateReconciliationCorporateOwnedLifeInsuranceAmount	-50000	USD
	ottr	Effective Income Tax Rate Reconciliation Corporate Owned Life Insurance Amount EffectiveIncomeTaxRateReconciliationCorporateOwnedLifeInsuranceAmount	-141000	USD
	ottr	Effective Income Tax Rate Reconciliation Corporate Owned Life Insurance Amount EffectiveIncomeTaxRateReconciliationCorporateOwnedLifeInsuranceAmount	-609000	USD
CY2020Q3	us-gaap	Income Tax Reconciliation Prior Year Income Taxes IncomeTaxReconciliationPriorYearIncomeTaxes	172000	USD
CY2019Q3	us-gaap	Income Tax Reconciliation Prior Year Income Taxes IncomeTaxReconciliationPriorYearIncomeTaxes	-688000	USD
	us-gaap	Income Tax Reconciliation Prior Year Income Taxes IncomeTaxReconciliationPriorYearIncomeTaxes	172000	USD
	us-gaap	Income Tax Reconciliation Prior Year Income Taxes IncomeTaxReconciliationPriorYearIncomeTaxes	-722000	USD
CY2020Q3	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-40000	USD
CY2019Q3	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-1000	USD
	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-20000	USD
	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	30000	USD
CY2020Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	859000	USD
CY2019Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1302000	USD
CY2020Q3	us-gaap	Decrease In Unrecognized Tax Benefits Is Reasonably Possible DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible	139000	USD
CY2020Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	9097000	USD
CY2019Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	4936000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	18543000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	13907000	USD
CY2020Q3	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.202	pure
CY2019Q3	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.166	pure
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.194	pure
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.173	pure
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1488000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1282000	USD
	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	27000	USD
	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	37000	USD
	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	123000	USD
	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	153000	USD
	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	586000	USD
	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	-0	USD
	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	139000	USD
	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	170000	USD

Files In Submission

Name	View Source	Status
0001437749-20-022930-index-headers.html	Edgar Link	pending
0001437749-20-022930-index.html	Edgar Link	pending
0001437749-20-022930.txt	Edgar Link	pending
0001437749-20-022930-xbrl.zip	Edgar Link	pending
ex_209551.htm	Edgar Link	pending
ex_209552.htm	Edgar Link	pending
ex_209553.htm	Edgar Link	pending
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report.css	Edgar Link	pending
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$OTTR
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2020 Q4 Form 10-Q Financial Statement

#000143774920022930 Filed on November 06, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$OTTR Otter Tail Corp Stock $ottr

2020 Q4 Form 10-Q Financial Statement

#000143774920022930 Filed on November 06, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$OTTR
Otter Tail Corp Stock $ottr