$OTTR
Otter Tail Corp Stock $ottr

$ottr Overview Financials Valuation SEC Filings Company Website

2017 Q4 Form 10-K Financial Statement

#000143774919003150 Filed on February 22, 2019

Income Statement

Concept	2017 Q4	2017	2016 Q4
Revenue	$206.7M	$849.4M	$196.6M
YoY Change	5.14%	5.7%	4.13%
Cost Of Revenue	$86.90M	$316.6M	$86.00M
YoY Change	1.05%	7.23%	-0.23%
Gross Profit	$119.8M	$532.8M	$110.6M
YoY Change	8.32%	4.81%	7.8%
Gross Profit Margin	57.96%	62.73%	56.26%
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$18.80M	$72.55M	$18.30M
YoY Change	2.73%	-1.23%	13.66%
% of Gross Profit	15.69%	13.62%	16.55%
Operating Expenses	$81.50M	$335.7M	$81.50M
YoY Change	0.0%	0.51%	11.95%
Operating Profit	$38.30M	$132.3M	$29.10M
YoY Change	31.62%	13.42%	-2.35%
Interest Expense	-$7.200M	-$29.60M	-$7.900M
YoY Change	-8.86%	-7.21%	-1.25%
% of Operating Profit	-18.8%	-22.38%	-27.15%
Other Income/Expense, Net	-$4.700M	$2.632M	$500.0K
YoY Change	-1040.0%	-9.4%	-28.57%
Pretax Income	$26.40M	$99.70M	$21.70M
YoY Change	21.66%	20.78%	-3.56%
Income Tax	$6.200M	$27.26M	$4.300M
% Of Pretax Income	23.48%	27.34%	19.82%
Net Earnings	$18.40M	$72.44M	$17.50M
YoY Change	5.14%	16.24%	19.86%
Net Earnings / Revenue	8.9%	8.53%	8.9%
Basic Earnings Per Share		$1.84
Diluted Earnings Per Share	$461.2K	$1.82	$441.9K
COMMON SHARES
Basic Shares Outstanding		39.46M
Diluted Shares Outstanding		39.75M

Balance Sheet

Concept	2017 Q4	2017	2016 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments	$16.20M	$16.20M	$0.00
YoY Change
Cash & Equivalents	$16.22M	$16.20M	$0.00
Short-Term Investments
Other Short-Term Assets	$12.49M	$57.50M	$8.144M
YoY Change	53.38%	16.16%	-81.98%
Inventory	$88.03M	$88.00M	$83.74M
Prepaid Expenses
Receivables	$68.47M	$68.50M	$68.24M
Other Receivables	$7.761M	$8.900M	$5.850M
Total Short-Term Assets	$239.1M	$239.1M	$208.0M
YoY Change	14.96%	14.95%	0.64%
LONG-TERM ASSETS
Property, Plant & Equipment	$1.540B	$1.540B	$1.477B
YoY Change	4.22%	4.22%	6.44%
Goodwill	$37.57M		$37.57M
YoY Change	0.0%		-5.44%
Intangibles	$13.77M		$14.96M
YoY Change	-7.98%
Long-Term Investments	$8.600M	$8.600M	$8.400M
YoY Change	2.38%	2.38%	1.2%
Other Assets	$36.01M	$165.6M	$34.10M
YoY Change	5.58%	-0.36%	-78.75%
Total Long-Term Assets	$1.765B	$1.765B	$1.704B
YoY Change	3.57%	3.57%	5.73%
TOTAL ASSETS
Total Short-Term Assets	$239.1M	$239.1M	$208.0M
Total Long-Term Assets	$1.765B	$1.765B	$1.704B
Total Assets	$2.004B	$2.004B	$1.912B
YoY Change	4.81%	4.81%	5.15%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$84.68M	$84.20M	$89.35M
YoY Change	-5.23%	-5.82%	-0.17%
Accrued Expenses	$32.90M	$32.90M	$32.90M
YoY Change	0.0%	0.0%	4.78%
Deferred Revenue
YoY Change
Short-Term Debt	$112.4M	$112.4M	$42.88M
YoY Change	162.04%	162.0%	-46.86%
Long-Term Debt Due	$186.0K	$200.0K	$33.20M
YoY Change	-99.44%	-99.4%	-36.64%
Total Short-Term Liabilities	$256.7M	$256.7M	$215.7M
YoY Change	19.0%	19.01%	-20.45%
LONG-TERM LIABILITIES
Long-Term Debt	$490.4M	$490.4M	$505.3M
YoY Change	-2.96%	-2.95%	13.87%
Other Long-Term Liabilities	$22.77M	$438.5M	$21.71M
YoY Change	4.9%	61.33%	-91.86%
Total Long-Term Liabilities	$513.1M	$928.9M	$527.0M
YoY Change	-2.64%	19.53%	-25.8%
TOTAL LIABILITIES
Total Short-Term Liabilities	$256.7M	$256.7M	$215.7M
Total Long-Term Liabilities	$513.1M	$928.9M	$527.0M
Total Liabilities	$769.8M	$1.307B	$742.7M
YoY Change	3.65%	5.24%	-38.81%
SHAREHOLDERS EQUITY
Retained Earnings	$161.3M		$139.5M
YoY Change	15.63%
Common Stock	$541.2M		$534.4M
YoY Change	1.27%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$696.9M	$696.9M	$670.1M
YoY Change
Total Liabilities & Shareholders Equity	$2.004B	$2.004B	$1.912B
YoY Change	4.81%	4.81%	5.15%

Cashflow Statement

Concept	2017 Q4	2017	2016 Q4
OPERATING ACTIVITIES
Net Income	$18.40M	$72.44M	$17.50M
YoY Change	5.14%	16.24%	19.86%
Depreciation, Depletion And Amortization	$18.80M	$72.55M	$18.30M
YoY Change	2.73%	-1.23%	13.66%
Cash From Operating Activities	$59.50M	$173.6M	$48.70M
YoY Change	22.18%	6.24%	2.96%
INVESTING ACTIVITIES
Capital Expenditures	-$38.40M	-$132.9M	-$35.40M
YoY Change	8.47%	-17.61%	-20.98%
Acquisitions
YoY Change
Other Investing Activities	$1.000M	$300.0K	-$600.0K
YoY Change	-266.67%	-84.21%	-107.23%
Cash From Investing Activities	-$37.30M	-$132.6M	-$35.90M
YoY Change	3.9%	-16.78%	-1.64%
FINANCING ACTIVITIES
Cash Dividend Paid		$50.63M
YoY Change
Common Stock Issuance & Retirement, Net		-$2.550M
YoY Change		-94.25%
Debt Paid & Issued, Net		$48.23M
YoY Change		-44.91%
Cash From Financing Activities	-6.800M	-$24.77M	-12.80M
YoY Change	-46.87%	509.82%	12.28%
NET CHANGE
Cash From Operating Activities	59.50M	$173.6M	48.70M
Cash From Investing Activities	-37.30M	-$132.6M	-35.90M
Cash From Financing Activities	-6.800M	-$24.77M	-12.80M
Net Change In Cash	15.40M	$16.22M	0.000000001863
YoY Change	826781204479999900.0%		-100.0%
FREE CASH FLOW
Cash From Operating Activities	$59.50M	$173.6M	$48.70M
Capital Expenditures	-$38.40M	-$132.9M	-$35.40M
Free Cash Flow	$97.90M	$306.5M	$84.10M
YoY Change	16.41%	-5.61%	-8.69%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value
CY2018	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2018	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2018	dei	Amendment Flag AmendmentFlag	false
CY2018	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2018	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2018
CY2018	dei	Document Period End Date DocumentPeriodEndDate	2018-12-31
CY2018	dei	Document Type DocumentType	10-K
CY2019Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	39729708
CY2018	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2018Q2	dei	Entity Public Float EntityPublicFloat	1810041170
CY2018	dei	Entity Small Business EntitySmallBusiness	false
CY2018	dei	Entity Shell Company EntityShellCompany	false
CY2018	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2018	dei	Entity Central Index Key EntityCentralIndexKey	0001466593
CY2018	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2018	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2018	dei	Entity Registrant Name EntityRegistrantName	Otter Tail Corp
CY2018	dei	Trading Symbol TradingSymbol	ottr
CY2017	ottr	Asset Retirement Obligation Settlements Accumulated Depreciation AssetRetirementObligationSettlementsAccumulatedDepreciation
CY2018	ottr	Asset Retirement Obligation Settlements Asset Retirement Obligation AssetRetirementObligationSettlementsAssetRetirementObligation
CY2017	ottr	Asset Retirement Obligation Settlements Asset Retirement Obligation AssetRetirementObligationSettlementsAssetRetirementObligation
CY2018	ottr	Asset Retirement Obligation Settlements Retired Original Capitalized Asset Retirement Cost AssetRetirementObligationSettlementsRetiredOriginalCapitalizedAssetRetirementCost
CY2017	ottr	Asset Retirement Obligation Settlements Retired Original Capitalized Asset Retirement Cost AssetRetirementObligationSettlementsRetiredOriginalCapitalizedAssetRetirementCost
CY2018	ottr	Asset Retirement Obligation Settlements Settlement Cost AssetRetirementObligationSettlementsSettlementCost
CY2017	ottr	Asset Retirement Obligation Settlements Settlement Cost AssetRetirementObligationSettlementsSettlementCost
CY2017Q4	ottr	Capitalized Costs Asset Retirement Costs Accumulated Depreciation CapitalizedCostsAssetRetirementCostsAccumulatedDepreciation	915000
CY2016Q4	ottr	Capitalized Costs Asset Retirement Costs Accumulated Depreciation CapitalizedCostsAssetRetirementCostsAccumulatedDepreciation	795000
CY2018Q4	ottr	Capitalized Costs Asset Retirement Costs Accumulated Depreciation CapitalizedCostsAssetRetirementCostsAccumulatedDepreciation	1034000
CY2018Q4	ottr	Accounts Payable Outstanding Related To Capital Additions AccountsPayableOutstandingRelatedToCapitalAdditions	13757000
CY2017Q4	ottr	Accounts Payable Outstanding Related To Capital Additions AccountsPayableOutstandingRelatedToCapitalAdditions	13887000
CY2018	ottr	Asset Retirement Obligation Gain On Settlement AssetRetirementObligationGainOnSettlement
CY2017	ottr	Asset Retirement Obligation Gain On Settlement AssetRetirementObligationGainOnSettlement
CY2018	ottr	Asset Retirement Obligation Settlements Accumulated Depreciation AssetRetirementObligationSettlementsAccumulatedDepreciation
CY2018	ottr	Capitalized Costs Asset Retirement Costs Accumulated Depreciation Depreciation Expense CapitalizedCostsAssetRetirementCostsAccumulatedDepreciationDepreciationExpense	119000
CY2017	ottr	Capitalized Costs Asset Retirement Costs Accumulated Depreciation Depreciation Expense CapitalizedCostsAssetRetirementCostsAccumulatedDepreciationDepreciationExpense	120000
CY2018	ottr	Capitalized Costs Asset Retirement Costs Accumulated Depreciation Liabilities Incurred CapitalizedCostsAssetRetirementCostsAccumulatedDepreciationLiabilitiesIncurred
CY2017	ottr	Capitalized Costs Asset Retirement Costs Accumulated Depreciation Liabilities Incurred CapitalizedCostsAssetRetirementCostsAccumulatedDepreciationLiabilitiesIncurred
CY2018	ottr	Capitalized Costs Asset Retirement Costs Accumulated Depreciation Liabilities Settled CapitalizedCostsAssetRetirementCostsAccumulatedDepreciationLiabilitiesSettled
CY2017	ottr	Capitalized Costs Asset Retirement Costs Accumulated Depreciation Liabilities Settled CapitalizedCostsAssetRetirementCostsAccumulatedDepreciationLiabilitiesSettled
CY2018	ottr	Capitalized Costs Asset Retirement Costs Accumulated Depreciation Revision Of Estimate CapitalizedCostsAssetRetirementCostsAccumulatedDepreciationRevisionOfEstimate
CY2017	ottr	Capitalized Costs Asset Retirement Costs Accumulated Depreciation Revision Of Estimate CapitalizedCostsAssetRetirementCostsAccumulatedDepreciationRevisionOfEstimate
CY2018	ottr	Capitalized Costs Asset Retirement Costs Liabilities Incurred CapitalizedCostsAssetRetirementCostsLiabilitiesIncurred
CY2017	ottr	Capitalized Costs Asset Retirement Costs Liabilities Incurred CapitalizedCostsAssetRetirementCostsLiabilitiesIncurred
CY2018	ottr	Capitalized Costs Asset Retirement Costs Liabilities Settled CapitalizedCostsAssetRetirementCostsLiabilitiesSettled
CY2017	ottr	Capitalized Costs Asset Retirement Costs Liabilities Settled CapitalizedCostsAssetRetirementCostsLiabilitiesSettled
CY2018	ottr	Capitalized Costs Asset Retirement Costs Revision Of Estimate CapitalizedCostsAssetRetirementCostsRevisionOfEstimate
CY2017	ottr	Capitalized Costs Asset Retirement Costs Revision Of Estimate CapitalizedCostsAssetRetirementCostsRevisionOfEstimate
CY2018	ottr	Income Loss Before Income Tax IncomeLossBeforeIncomeTax	96933000
CY2017Q4	ottr	Deferred Tax Assets Investment Tax Credits DeferredTaxAssetsInvestmentTaxCredits	515000
CY2018Q4	ottr	Deferred Tax Assets Production Tax Credits DeferredTaxAssetsProductionTaxCredits	32101000
CY2017Q4	ottr	Deferred Tax Assets Production Tax Credits DeferredTaxAssetsProductionTaxCredits	40614000
CY2018Q4	ottr	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Pension And Postretirement Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensionAndPostretirementBenefits	32664000
CY2017Q4	ottr	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Pension And Postretirement Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensionAndPostretirementBenefits	31894000
CY2018	ottr	Effective Income Tax Rate Reconciliation Permanent Differences Rd Tax Credits Unitary Tax And Other Adjustments Amount EffectiveIncomeTaxRateReconciliationPermanentDifferencesRdTaxCreditsUnitaryTaxAndOtherAdjustmentsAmount	1864000
CY2017	ottr	Effective Income Tax Rate Reconciliation Permanent Differences Rd Tax Credits Unitary Tax And Other Adjustments Amount EffectiveIncomeTaxRateReconciliationPermanentDifferencesRdTaxCreditsUnitaryTaxAndOtherAdjustmentsAmount	1873000
CY2016	ottr	Effective Income Tax Rate Reconciliation Permanent Differences Rd Tax Credits Unitary Tax And Other Adjustments Amount EffectiveIncomeTaxRateReconciliationPermanentDifferencesRdTaxCreditsUnitaryTaxAndOtherAdjustmentsAmount	1262000
CY2016	ottr	Equity Impact Of New Accounting Standards Adopted EquityImpactOfNewAccountingStandardsAdopted	1869000
CY2017	ottr	Income Loss Before Income Tax IncomeLossBeforeIncomeTax	99695000
CY2018	ottr	Change In Checks Written In Excess Of Cash ChangeInChecksWrittenInExcessOfCash	345000
CY2017	ottr	Change In Checks Written In Excess Of Cash ChangeInChecksWrittenInExcessOfCash	-2434000
CY2016	ottr	Change In Checks Written In Excess Of Cash ChangeInChecksWrittenInExcessOfCash	3363000
CY2018Q4	ottr	Deferred Tax Assets Cost Of Removal DeferredTaxAssetsCostOfRemoval	21787000
CY2017Q4	ottr	Deferred Tax Assets Cost Of Removal DeferredTaxAssetsCostOfRemoval	21800000
CY2018Q4	ottr	Deferred Tax Assets Investment Tax Credits DeferredTaxAssetsInvestmentTaxCredits	449000
CY2018Q4	ottr	Deferred Tax Liabilities Excess Tax Over Book Pension DeferredTaxLiabilitiesExcessTaxOverBookPension	15145000
CY2017Q4	ottr	Deferred Tax Liabilities Excess Tax Over Book Pension DeferredTaxLiabilitiesExcessTaxOverBookPension	14077000
CY2018Q4	ottr	Deferred Tax Liabilities Operating Loss Carryforwards State And Local DeferredTaxLiabilitiesOperatingLossCarryforwardsStateAndLocal	523000
CY2017Q4	ottr	Deferred Tax Liabilities Operating Loss Carryforwards State And Local DeferredTaxLiabilitiesOperatingLossCarryforwardsStateAndLocal	673000
CY2018Q4	ottr	Deferred Tax Liabilities Retirement Benefits Regulatory Asset DeferredTaxLiabilitiesRetirementBenefitsRegulatoryAsset	32664000
CY2017Q4	ottr	Deferred Tax Liabilities Retirement Benefits Regulatory Asset DeferredTaxLiabilitiesRetirementBenefitsRegulatoryAsset	31894000
CY2018Q4	ottr	Deferred Tax Liabilities Tax Credits DeferredTaxLiabilitiesTaxCredits	4386000
CY2017Q4	ottr	Deferred Tax Liabilities Tax Credits DeferredTaxLiabilitiesTaxCredits	4112000
CY2017	ottr	Deferred Tax Liabilities Tax Effect On Deferred Tax Valuation Adjustment DeferredTaxLiabilitiesTaxEffectOnDeferredTaxValuationAdjustment	38786000
CY2017	ottr	Deferred Tax Liability Change Due To Accruals And Amortizations DeferredTaxLiabilityChangeDueToAccrualsAndAmortizations	20012000
CY2017	ottr	Deferred Tax Liability Deferred Tax Valuation Adjustment DeferredTaxLiabilityDeferredTaxValuationAdjustment	109072000
CY2018Q4	ottr	Defined Benefit Plan Regulatory Assets DefinedBenefitPlanRegulatoryAssets	18094000
CY2017Q4	ottr	Defined Benefit Plan Regulatory Assets DefinedBenefitPlanRegulatoryAssets	18927000
CY2018	ottr	Directors Deferred Compensation DirectorsDeferredCompensation	578
CY2018	ottr	Effective Income Tax Rate Reconciliation Corporate Owned Life Insurance Amount EffectiveIncomeTaxRateReconciliationCorporateOwnedLifeInsuranceAmount	-3000
CY2017	ottr	Effective Income Tax Rate Reconciliation Corporate Owned Life Insurance Amount EffectiveIncomeTaxRateReconciliationCorporateOwnedLifeInsuranceAmount	-845000
CY2016	ottr	Effective Income Tax Rate Reconciliation Corporate Owned Life Insurance Amount EffectiveIncomeTaxRateReconciliationCorporateOwnedLifeInsuranceAmount	-680000
CY2018	ottr	Effective Income Tax Rate Reconciliation Deduction Equity Method Stock Awards EffectiveIncomeTaxRateReconciliationDeductionEquityMethodStockAwards	708000
CY2017	ottr	Effective Income Tax Rate Reconciliation Deduction Equity Method Stock Awards EffectiveIncomeTaxRateReconciliationDeductionEquityMethodStockAwards	751000
CY2016	ottr	Effective Income Tax Rate Reconciliation Deduction Equity Method Stock Awards EffectiveIncomeTaxRateReconciliationDeductionEquityMethodStockAwards
CY2016	ottr	Income Loss Before Income Tax IncomeLossBeforeIncomeTax	82540000
CY2018	ottr	Income Tax Reconciliation Allowance For Funds Used During Construction IncomeTaxReconciliationAllowanceForFundsUsedDuringConstruction	431000
CY2017	ottr	Income Tax Reconciliation Allowance For Funds Used During Construction IncomeTaxReconciliationAllowanceForFundsUsedDuringConstruction	322000
CY2016	ottr	Income Tax Reconciliation Allowance For Funds Used During Construction IncomeTaxReconciliationAllowanceForFundsUsedDuringConstruction	280000
CY2018	ottr	Income Tax Reconciliation Differences Reversing In Excess Of Federal Rates IncomeTaxReconciliationDifferencesReversingInExcessOfFederalRates	-3432000
CY2017	ottr	Income Tax Reconciliation Differences Reversing In Excess Of Federal Rates IncomeTaxReconciliationDifferencesReversingInExcessOfFederalRates	551000
CY2016	ottr	Income Tax Reconciliation Differences Reversing In Excess Of Federal Rates IncomeTaxReconciliationDifferencesReversingInExcessOfFederalRates	77000
CY2018	ottr	Income Tax Reconciliation Production Tax Credit IncomeTaxReconciliationProductionTaxCredit	3111000
CY2017	ottr	Income Tax Reconciliation Production Tax Credit IncomeTaxReconciliationProductionTaxCredit	7527000
CY2016	ottr	Income Tax Reconciliation Production Tax Credit IncomeTaxReconciliationProductionTaxCredit	7175000
CY2018	ottr	Increase Decrease In Deferred Charges And Other Assets IncreaseDecreaseInDeferredChargesAndOtherAssets	941000
CY2017	ottr	Increase Decrease In Deferred Charges And Other Assets IncreaseDecreaseInDeferredChargesAndOtherAssets	-2173000
CY2016	ottr	Increase Decrease In Deferred Charges And Other Assets IncreaseDecreaseInDeferredChargesAndOtherAssets	-10090000
CY2018	ottr	Increase Decrease In Interest Payable And Income Taxes Receivable Payable Net IncreaseDecreaseInInterestPayableAndIncomeTaxesReceivablePayableNet	396000
CY2017	ottr	Increase Decrease In Interest Payable And Income Taxes Receivable Payable Net IncreaseDecreaseInInterestPayableAndIncomeTaxesReceivablePayableNet	-1186000
CY2016	ottr	Increase Decrease In Interest Payable And Income Taxes Receivable Payable Net IncreaseDecreaseInInterestPayableAndIncomeTaxesReceivablePayableNet	3339000
CY2018	ottr	Increase Decrease In Other Operating Liabilities And Increase Decrease In Deferred Liabilities IncreaseDecreaseInOtherOperatingLiabilitiesAndIncreaseDecreaseInDeferredLiabilities	2414000
CY2017	ottr	Increase Decrease In Other Operating Liabilities And Increase Decrease In Deferred Liabilities IncreaseDecreaseInOtherOperatingLiabilitiesAndIncreaseDecreaseInDeferredLiabilities	-19257000
CY2016	ottr	Increase Decrease In Other Operating Liabilities And Increase Decrease In Deferred Liabilities IncreaseDecreaseInOtherOperatingLiabilitiesAndIncreaseDecreaseInDeferredLiabilities	-14685000
CY2018	ottr	Increase Decrease In Percentage Of Production Tax Credits IncreaseDecreaseInPercentageOfProductionTaxCredits	-0.53
CY2017	ottr	Increase Decrease In Percentage Of Production Tax Credits IncreaseDecreaseInPercentageOfProductionTaxCredits	0.044
CY2018	ottr	Incremental Common Shares Attributable To Dilutive Effect Of Nonvested Restricted Shares IncrementalCommonSharesAttributableToDilutiveEffectOfNonvestedRestrictedShares	17751
CY2017	ottr	Incremental Common Shares Attributable To Dilutive Effect Of Nonvested Restricted Shares IncrementalCommonSharesAttributableToDilutiveEffectOfNonvestedRestrictedShares	20380
CY2016	ottr	Incremental Common Shares Attributable To Dilutive Effect Of Nonvested Restricted Shares IncrementalCommonSharesAttributableToDilutiveEffectOfNonvestedRestrictedShares	16778
CY2018	ottr	Incremental Common Shares Attributable To Dilutive Effect Of Shares Expected To Be Issued Under Deferred Compensation Program For Directors IncrementalCommonSharesAttributableToDilutiveEffectOfSharesExpectedToBeIssuedUnderDeferredCompensationProgramForDirectors	2478
CY2017	ottr	Incremental Common Shares Attributable To Dilutive Effect Of Shares Expected To Be Issued Under Deferred Compensation Program For Directors IncrementalCommonSharesAttributableToDilutiveEffectOfSharesExpectedToBeIssuedUnderDeferredCompensationProgramForDirectors	2970
CY2016	ottr	Incremental Common Shares Attributable To Dilutive Effect Of Shares Expected To Be Issued Under Deferred Compensation Program For Directors IncrementalCommonSharesAttributableToDilutiveEffectOfSharesExpectedToBeIssuedUnderDeferredCompensationProgramForDirectors	3417
CY2018	ottr	Incremental Common Shares Attributable To Dilutive Effect Of Underlying Shares Related To Nonvested Restricted Stock Units Granted To Employees IncrementalCommonSharesAttributableToDilutiveEffectOfUnderlyingSharesRelatedToNonvestedRestrictedStockUnitsGrantedToEmployees	59980
CY2017	ottr	Incremental Common Shares Attributable To Dilutive Effect Of Underlying Shares Related To Nonvested Restricted Stock Units Granted To Employees IncrementalCommonSharesAttributableToDilutiveEffectOfUnderlyingSharesRelatedToNonvestedRestrictedStockUnitsGrantedToEmployees	56952
CY2016	ottr	Incremental Common Shares Attributable To Dilutive Effect Of Underlying Shares Related To Nonvested Restricted Stock Units Granted To Employees IncrementalCommonSharesAttributableToDilutiveEffectOfUnderlyingSharesRelatedToNonvestedRestrictedStockUnitsGrantedToEmployees	45712
CY2018	ottr	Land Easement Nonlease Payments Expense LandEasementNonleasePaymentsExpense	605000
CY2017	ottr	Land Easement Nonlease Payments Expense LandEasementNonleasePaymentsExpense	593000
CY2016	ottr	Land Easement Nonlease Payments Expense LandEasementNonleasePaymentsExpense	582000
CY2018Q4	ottr	Line Of Credit Facility Amount Restricted LineOfCreditFacilityAmountRestricted	300000
CY2018	ottr	Maximum Per Share Differences Between Basic And Diluted Earnings Per Share In Total Or From Continuing Or Discontinued Operations MaximumPerShareDifferencesBetweenBasicAndDilutedEarningsPerShareInTotalOrFromContinuingOrDiscontinuedOperations	0.016
CY2017	ottr	Maximum Per Share Differences Between Basic And Diluted Earnings Per Share In Total Or From Continuing Or Discontinued Operations MaximumPerShareDifferencesBetweenBasicAndDilutedEarningsPerShareInTotalOrFromContinuingOrDiscontinuedOperations	0.016
CY2016	ottr	Maximum Per Share Differences Between Basic And Diluted Earnings Per Share In Total Or From Continuing Or Discontinued Operations MaximumPerShareDifferencesBetweenBasicAndDilutedEarningsPerShareInTotalOrFromContinuingOrDiscontinuedOperations	0.016
CY2018Q4	ottr	Net Regulatory Assets Liability Current NetRegulatoryAssetsLiabilityCurrent	16487000
CY2017Q4	ottr	Net Regulatory Assets Liability Current NetRegulatoryAssetsLiabilityCurrent	12863000
CY2018Q4	ottr	Net Regulatory Assets Liability Noncurrent NetRegulatoryAssetsLiabilityNoncurrent	-91212000
CY2017Q4	ottr	Net Regulatory Assets Liability Noncurrent NetRegulatoryAssetsLiabilityNoncurrent	-103317000
CY2018	ottr	Other Comprehensive Income Deferred Tax Rate Adjustment OtherComprehensiveIncomeDeferredTaxRateAdjustment	-531000
CY2017	ottr	Other Comprehensive Income Deferred Tax Rate Adjustment OtherComprehensiveIncomeDeferredTaxRateAdjustment
CY2016	ottr	Other Comprehensive Income Deferred Tax Rate Adjustment OtherComprehensiveIncomeDeferredTaxRateAdjustment
CY2018Q4	ottr	Other Contracts With Customer Liability Noncurrent OtherContractsWithCustomerLiabilityNoncurrent	1895000
CY2017Q4	ottr	Other Contracts With Customer Liability Noncurrent OtherContractsWithCustomerLiabilityNoncurrent	3329000
CY2018	ottr	Payments Of Ordinary Dividends And Other Distributions PaymentsOfOrdinaryDividendsAndOtherDistributions	53198000
CY2017	ottr	Payments Of Ordinary Dividends And Other Distributions PaymentsOfOrdinaryDividendsAndOtherDistributions	50632000
CY2016	ottr	Payments Of Ordinary Dividends And Other Distributions PaymentsOfOrdinaryDividendsAndOtherDistributions	48244000
CY2018	ottr	Period For Unrecognized Tax Benefits Not Expected Change PeriodForUnrecognizedTaxBenefitsNotExpectedChange	P1Y
CY2018Q4	ottr	Public Utilities Property Plant And Equipment Electric PublicUtilitiesPropertyPlantAndEquipmentElectric	2019721000
CY2017Q4	ottr	Public Utilities Property Plant And Equipment Electric PublicUtilitiesPropertyPlantAndEquipmentElectric	1981018000
CY2018	ottr	Regulatory Noncurrent Asset Remaining Recovery Period RegulatoryNoncurrentAssetRemainingRecoveryPeriod	P13Y270D
CY2018	ottr	Shares Withheld For Individual Income Tax Requirements SharesWithheldForIndividualIncomeTaxRequirements	71208
CY2018	ottr	Standard Product Warranty Term StandardProductWarrantyTerm	P1Y
CY2018	ottr	Stock Issued During Period Shares Vesting Of Restricted Stock Units StockIssuedDuringPeriodSharesVestingOfRestrictedStockUnits	26575
CY2018Q4	ottr	Total Deferred Credits And Liabilities TotalDeferredCreditsAndLiabilities	369314000
CY2017Q4	ottr	Total Deferred Credits And Liabilities TotalDeferredCreditsAndLiabilities	358102000
CY2018	ottr	Wind Tax Credits Amortization Period WindTaxCreditsAmortizationPeriod	P25Y
CY2018Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	96291000
CY2017Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	84677000
CY2018Q4	us-gaap	Accounts Payable Related Parties Current AccountsPayableRelatedPartiesCurrent	7000
CY2017Q4	us-gaap	Accounts Payable Related Parties Current AccountsPayableRelatedPartiesCurrent	6000
CY2018Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	75144000
CY2017Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	68466000
CY2018Q4	us-gaap	Accounts Receivable Related Parties Current AccountsReceivableRelatedPartiesCurrent	1931000
CY2017Q4	us-gaap	Accounts Receivable Related Parties Current AccountsReceivableRelatedPartiesCurrent	2098000
CY2018Q4	us-gaap	Accrual For Taxes Other Than Income Taxes Current AccrualForTaxesOtherThanIncomeTaxesCurrent	17287000
CY2017Q4	us-gaap	Accrual For Taxes Other Than Income Taxes Current AccrualForTaxesOtherThanIncomeTaxesCurrent	16808000
CY2018Q4	us-gaap	Accumulated Deferred Investment Tax Credit AccumulatedDeferredInvestmentTaxCredit	19974000
CY2017Q4	us-gaap	Accumulated Deferred Investment Tax Credit AccumulatedDeferredInvestmentTaxCredit	21379000
CY2018Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	848369000
CY2017Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	799419000
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-4144000
CY2017Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-5631000
CY2018Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	344250000
CY2017Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	343450000
CY2018	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	4441000
CY2017	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	3642000
CY2016	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	3178000
CY2018Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	1407000
CY2017Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	1094000
CY2018	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1315000
CY2017	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1347000
CY2016	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1436000
CY2017Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	8719000
CY2016Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	8341000
CY2018Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	9117000
CY2017Q4	us-gaap	Assets Current AssetsCurrent	239127000
CY2018Q4	us-gaap	Capital Leases Balance Sheet Assets By Major Class Net CapitalLeasesBalanceSheetAssetsByMajorClassNet	0
CY2018Q4	us-gaap	Capitalization Longterm Debt And Equity CapitalizationLongtermDebtAndEquity	1318865000
CY2017Q4	us-gaap	Capitalization Longterm Debt And Equity CapitalizationLongtermDebtAndEquity	1187272000
CY2017Q4	us-gaap	Capitalized Costs Asset Retirement Costs CapitalizedCostsAssetRetirementCosts	2983000
CY2017Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	50000000
CY2018Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	39664884
CY2018	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	398000
CY2017	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	378000
CY2018	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred
CY2017	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred
CY2018	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled
CY2017	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled
CY2018	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate
CY2017	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate
CY2018Q4	us-gaap	Assets Assets	2052517000
CY2017Q4	us-gaap	Assets Assets	2004278000
CY2016Q4	us-gaap	Assets Assets	1912385000
CY2018Q4	us-gaap	Assets Current AssetsCurrent	241420000
CY2016Q4	us-gaap	Capitalized Costs Asset Retirement Costs CapitalizedCostsAssetRetirementCosts	2983000
CY2018Q4	us-gaap	Capitalized Costs Asset Retirement Costs CapitalizedCostsAssetRetirementCosts	2983000
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	861000
CY2017Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	16216000
CY2016Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue
CY2015Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue
CY2018	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-15355000
CY2017	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	16216000
CY2016	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease
CY2018	us-gaap	Cash Dividends Paid To Parent Company CashDividendsPaidToParentCompany	53134000
CY2017	us-gaap	Cash Dividends Paid To Parent Company CashDividendsPaidToParentCompany	50571000
CY2016	us-gaap	Cash Dividends Paid To Parent Company CashDividendsPaidToParentCompany	77779000
CY2018Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies
CY2017Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies
CY2018	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.34
CY2017	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.28
CY2016	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.25
CY2018Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	5
CY2017Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	5
CY2018Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	50000000
CY2017Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	39557491
CY2018Q4	us-gaap	Common Stock Value CommonStockValue	198324000
CY2017Q4	us-gaap	Common Stock Value CommonStockValue	197787000
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	83832000
CY2017	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	70608000
CY2016	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	62419000
CY2018Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	181626000
CY2017Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	141067000
CY2018	us-gaap	Costs And Expenses CostsAndExpenses	787058000
CY2017	us-gaap	Costs And Expenses CostsAndExpenses	717063000
CY2016	us-gaap	Costs And Expenses CostsAndExpenses	686908000
CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	4960000
CY2017	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	4434000
CY2016	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	989000
CY2018	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	1395000
CY2017	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	1128000
CY2016	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	1208000
CY2018Q4	us-gaap	Debt Instrument Unamortized Discount DebtInstrumentUnamortizedDiscount	2349000
CY2017Q4	us-gaap	Debt Instrument Unamortized Discount DebtInstrumentUnamortizedDiscount	2145000
CY2018Q4	us-gaap	Debt Longterm And Shortterm Combined Amount DebtLongtermAndShorttermCombinedAmount	608773000
CY2017Q4	us-gaap	Debt Longterm And Shortterm Combined Amount DebtLongtermAndShorttermCombinedAmount	602937000
CY2018	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	8065000
CY2017	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	25648000
CY2016	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	23774000
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	19224000
CY2017	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	24001000
CY2016	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	19124000
CY2018Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	321610000
CY2017Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	312293000
CY2018	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	4410000
CY2017	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	4587000
CY2016	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	2623000
CY2018Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	200634000
CY2017Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	211792000
CY2018Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	2489000
CY2017Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	3203000
CY2018Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	3218000
CY2017Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	668000
CY2018Q4	us-gaap	Deferred Tax Assets Property Plant And Equipment DeferredTaxAssetsPropertyPlantAndEquipment	6842000
CY2017Q4	us-gaap	Deferred Tax Assets Property Plant And Equipment DeferredTaxAssetsPropertyPlantAndEquipment	6499000
CY2018Q4	us-gaap	Deferred Tax Assets Regulatory Assets And Liabilities DeferredTaxAssetsRegulatoryAssetsAndLiabilities	33228000
CY2017Q4	us-gaap	Deferred Tax Assets Regulatory Assets And Liabilities DeferredTaxAssetsRegulatoryAssetsAndLiabilities	39465000
CY2018Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Other DeferredTaxAssetsTaxCreditCarryforwardsOther	32570000
CY2017Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Other DeferredTaxAssetsTaxCreditCarryforwardsOther	32962000
CY2018Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Compensated Absences DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsCompensatedAbsences	1919000
CY2017Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Compensated Absences DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsCompensatedAbsences	1844000
CY2018Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits	33967000
CY2017Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits	32328000
CY2018Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	600000
CY2017Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance
CY2018Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	120976000
CY2017Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	100501000
CY2016Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	226591000
CY2018Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	120976000
CY2017Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	100501000
CY2018Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	7496000
CY2017Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	3631000
CY2018Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	261396000
CY2017Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	257906000
CY2018Q4	us-gaap	Defined Benefit Pension Plan Liabilities Noncurrent DefinedBenefitPensionPlanLiabilitiesNoncurrent	98358000
CY2017Q4	us-gaap	Defined Benefit Pension Plan Liabilities Noncurrent DefinedBenefitPensionPlanLiabilitiesNoncurrent	109708000
CY2018Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Five Fiscal Years Thereafter DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter	96186000
CY2018Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Next Twelve Months DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths	15086000
CY2018Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Five DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive	17709000
CY2018Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Four DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour	17017000
CY2018Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Three DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree	16356000
CY2018Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Two DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo	15689000
CY2018	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	4532000
CY2017	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	4211000
CY2016	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	3877000
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	74666000
CY2017	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	72545000
CY2016	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	73445000
CY2018	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	53198000
CY2017	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	50632000
CY2016	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	48244000
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.08
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.84
CY2016	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.62
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.06
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.82
CY2016	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.61
CY2018	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.15
CY2017	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.273
CY2016	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.245
CY2017	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2018	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21
CY2016	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2018Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	24857000
CY2017Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	21534000
CY2018Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	4300000
CY2018	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P1Y328D
CY2018	us-gaap	Employee Stock Ownership Plan Esop Cash Contributions To Esop EmployeeStockOwnershipPlanESOPCashContributionsToESOP	398000
CY2017	us-gaap	Employee Stock Ownership Plan Esop Cash Contributions To Esop EmployeeStockOwnershipPlanESOPCashContributionsToESOP	612000
CY2016	us-gaap	Employee Stock Ownership Plan Esop Cash Contributions To Esop EmployeeStockOwnershipPlanESOPCashContributionsToESOP	647000
CY2018Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	10195000
CY2017Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	9470000
CY2018Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	1184000
CY2018Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	1099000
CY2018Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	1099000
CY2018Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	1099000
CY2018Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	1133000
CY2018Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	22645000
CY2017Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	23235000
CY2018Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	12450000
CY2017Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	13765000
CY2017Q4	us-gaap	Goodwill Goodwill	37572000
CY2018Q4	us-gaap	Goodwill Goodwill	37572000
CY2016Q4	us-gaap	Goodwill Goodwill	37572000
CY2017Q4	us-gaap	Goodwill Gross GoodwillGross	37572000
CY2016Q4	us-gaap	Goodwill Gross GoodwillGross	37572000
CY2017Q4	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss
CY2016Q4	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss
CY2018	us-gaap	Goodwill Period Increase Decrease GoodwillPeriodIncreaseDecrease
CY2017	us-gaap	Goodwill Period Increase Decrease GoodwillPeriodIncreaseDecrease
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	96933000
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	99695000
CY2016	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	82540000
CY2018	us-gaap	Income Tax Credits And Adjustments IncomeTaxCreditsAndAdjustments	-1405000
CY2017	us-gaap	Income Tax Credits And Adjustments IncomeTaxCreditsAndAdjustments	-1470000
CY2016	us-gaap	Income Tax Credits And Adjustments IncomeTaxCreditsAndAdjustments	-1657000
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	14588000
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	27256000
CY2016	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	20219000
CY2016	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	118644
CY2018Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	12450000
CY2017	us-gaap	Income Tax Expense Benefit Continuing Operations Adjustment Of Deferred Tax Asset Liability IncomeTaxExpenseBenefitContinuingOperationsAdjustmentOfDeferredTaxAssetLiability	1756000
CY2018	us-gaap	Income Tax Expense Benefit Continuing Operations Adjustment Of Deferred Tax Asset Liability IncomeTaxExpenseBenefitContinuingOperationsAdjustmentOfDeferredTaxAssetLiability
CY2016	us-gaap	Income Tax Expense Benefit Continuing Operations Adjustment Of Deferred Tax Asset Liability IncomeTaxExpenseBenefitContinuingOperationsAdjustmentOfDeferredTaxAssetLiability
CY2017	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	850000
CY2017Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	13765000
CY2016	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	850000
CY2018	us-gaap	Income Tax Rate Reconciliation Deductions Employee Stock Ownership Plan Dividends IncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends	298000
CY2017	us-gaap	Income Tax Rate Reconciliation Deductions Employee Stock Ownership Plan Dividends IncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends	509000
CY2016	us-gaap	Income Tax Rate Reconciliation Deductions Employee Stock Ownership Plan Dividends IncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends	537000
CY2018	us-gaap	Income Tax Reconciliation Deductions Qualified Production Activities IncomeTaxReconciliationDeductionsQualifiedProductionActivities
CY2017	us-gaap	Income Tax Reconciliation Deductions Qualified Production Activities IncomeTaxReconciliationDeductionsQualifiedProductionActivities	1471000
CY2016	us-gaap	Income Tax Reconciliation Deductions Qualified Production Activities IncomeTaxReconciliationDeductionsQualifiedProductionActivities	482000
CY2018	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	20356000
CY2017	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	34893000
CY2016	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	28889000
CY2018	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	5210000
CY2017	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	4368000
CY2016	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	2869000
CY2018	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	98000
CY2017	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	164000
CY2016	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	350000
CY2018	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	1033000
CY2018	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	6109000
CY2017	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	5064000
CY2016	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-1291000
CY2018Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	2439000
CY2017Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	1181000
CY2018	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	14997000
CY2017	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-3013000
CY2016	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	11502000
CY2018	us-gaap	Increase Decrease In Allowance For Equity Funds Used During Construction IncreaseDecreaseInAllowanceForEquityFundsUsedDuringConstruction	2194000
CY2017	us-gaap	Increase Decrease In Allowance For Equity Funds Used During Construction IncreaseDecreaseInAllowanceForEquityFundsUsedDuringConstruction	986000
CY2016	us-gaap	Increase Decrease In Allowance For Equity Funds Used During Construction IncreaseDecreaseInAllowanceForEquityFundsUsedDuringConstruction	857000
CY2018	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	18236000
CY2017	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	4294000
CY2016	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-1874000
CY2018	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	754000
CY2017	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	3060000
CY2016	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	2541000
CY2018	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	8559000
CY2017	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	2135000
CY2016	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	944000
CY2018	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	212043
CY2017	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	210784
CY2018	us-gaap	Interest And Debt Expense InterestAndDebtExpense	30408000
CY2017	us-gaap	Interest And Debt Expense InterestAndDebtExpense	29604000
CY2016	us-gaap	Interest And Debt Expense InterestAndDebtExpense	31886000
CY2018	us-gaap	Interest Paid Net InterestPaidNet	28109000
CY2017	us-gaap	Interest Paid Net InterestPaidNet	29791000
CY2016	us-gaap	Interest Paid Net InterestPaidNet	31269000
CY2018Q4	us-gaap	Interest Receivable Current InterestReceivableCurrent	117000
CY2017Q4	us-gaap	Interest Receivable Current InterestReceivableCurrent	117000
CY2018Q4	us-gaap	Inventory Finished Goods Net Of Reserves InventoryFinishedGoodsNetOfReserves	37130000
CY2017Q4	us-gaap	Inventory Finished Goods Net Of Reserves InventoryFinishedGoodsNetOfReserves	26605000
CY2018Q4	us-gaap	Inventory Net InventoryNet	106270000
CY2017Q4	us-gaap	Inventory Net InventoryNet	88034000
CY2018Q4	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	48747000
CY2017Q4	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	47207000
CY2018Q4	us-gaap	Inventory Work In Process InventoryWorkInProcess	20393000
CY2017Q4	us-gaap	Inventory Work In Process InventoryWorkInProcess	14222000
CY2017	us-gaap	Net Income Loss NetIncomeLoss	72439000
CY2018Q4	us-gaap	Investments Investments	8961000
CY2017Q4	us-gaap	Investments Investments	8629000
CY2018Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	2052517000
CY2017Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	2004278000
CY2018Q4	us-gaap	Liabilities Current LiabilitiesCurrent	170093000
CY2017Q4	us-gaap	Liabilities Current LiabilitiesCurrent	256653000
CY2018Q4	us-gaap	Line Of Credit LineOfCredit	18599000
CY2018	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	6273000
CY2017	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	6237000
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-24771000
CY2016	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-4062000
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-107419000
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-132590000
CY2016	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-159324000
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	143448000
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	173577000
CY2016	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	163386000
CY2018	us-gaap	Net Income Loss NetIncomeLoss	82345000
CY2018Q1	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	122000000
CY2018Q4	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	300000000
CY2018Q4	us-gaap	Line Of Credit Facility Remaining Borrowing Capacity LineOfCreditFacilityRemainingBorrowingCapacity	281101000
CY2017Q4	us-gaap	Line Of Credit Facility Remaining Borrowing Capacity LineOfCreditFacilityRemainingBorrowingCapacity	187329000
CY2018Q4	us-gaap	Long Term Debt LongTermDebt	592523000
CY2017Q4	us-gaap	Long Term Debt LongTermDebt	492711000
CY2018Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	172000
CY2017Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	186000
CY2018Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	172000
CY2018Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
CY2018Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	30000000
CY2018Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	140166000
CY2018Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	185000
CY2018Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	590002000
CY2017Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	490380000
CY2018Q4	us-gaap	Long Term Investments LongTermInvestments	8961000
CY2017Q4	us-gaap	Long Term Investments LongTermInvestments	8629000
CY2018Q4	us-gaap	Loss Contingency Estimate Of Possible Loss LossContingencyEstimateOfPossibleLoss	1000000
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-51384000
CY2016	us-gaap	Net Income Loss NetIncomeLoss	62321000
CY2018	us-gaap	Net Periodic Defined Benefits Expense Reversal Of Expense Excluding Service Cost Component NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent	5509000
CY2017	us-gaap	Net Periodic Defined Benefits Expense Reversal Of Expense Excluding Service Cost Component NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent	5620000
CY2016	us-gaap	Net Periodic Defined Benefits Expense Reversal Of Expense Excluding Service Cost Component NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent	5110000
CY2018Q4	us-gaap	Net Regulatory Assets NetRegulatoryAssets	-74725000
CY2017Q4	us-gaap	Net Regulatory Assets NetRegulatoryAssets	-90454000
CY2018Q4	us-gaap	Notes Payable Related Parties Classified Current NotesPayableRelatedPartiesClassifiedCurrent	60626000
CY2017Q4	us-gaap	Notes Payable Related Parties Classified Current NotesPayableRelatedPartiesClassifiedCurrent	61908000
CY2018Q4	us-gaap	Notes Receivable Related Parties Current NotesReceivableRelatedPartiesCurrent	1167000
CY2017Q4	us-gaap	Notes Receivable Related Parties Current NotesReceivableRelatedPartiesCurrent	1752000
CY2018Q4	us-gaap	Notes Receivable Related Parties Noncurrent NotesReceivableRelatedPartiesNoncurrent	79422000
CY2017Q4	us-gaap	Notes Receivable Related Parties Noncurrent NotesReceivableRelatedPartiesNoncurrent	79611000
CY2018	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	3
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	129389000
CY2017	us-gaap	Operating Income Loss OperatingIncomeLoss	132287000
CY2016	us-gaap	Operating Income Loss OperatingIncomeLoss	116631000
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	31358000
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	6185000
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	3581000
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	3954000
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	5018000
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	5877000
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	6743000
CY2016	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	6711000
CY2018Q4	us-gaap	Other Assets Current OtherAssetsCurrent	6114000
CY2017Q4	us-gaap	Other Assets Current OtherAssetsCurrent	12491000
CY2018Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	35759000
CY2017Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	36006000
CY2018	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	985000
CY2017	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	629000
CY2016	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	628000
CY2018	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-131000
CY2017	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	65000
CY2016	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-11000
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	1487000
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-1831000
CY2016	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	98000
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	1487000
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-1831000
CY2016	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	98000
CY2018	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-1618000
CY2017	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	1896000
CY2016	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-109000
CY2018	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Unamortized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax	1919000
CY2017	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Unamortized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax	-3791000
CY2016	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Unamortized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax	-445000
CY2018	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-755000
CY2017	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	1266000
CY2016	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-74000
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	105000
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	15000
CY2016	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	3000
CY2018	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-61000
CY2017	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	115000
CY2016	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-14000
CY2018	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-35000
CY2017	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	35000
CY2016	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-6000
CY2018	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	51544000
CY2017	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	41492000
CY2016	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	38683000
CY2018Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	12149000
CY2017Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	11389000
CY2018Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	24326000
CY2017Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	22769000
CY2018	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense
CY2017	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-10000
CY2016	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-7000
CY2018	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	3461000
CY2017	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	2632000
CY2016	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	2905000
CY2018Q4	us-gaap	Other Postretirement Defined Benefit Plan Liabilities Noncurrent OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent	71561000
CY2017Q4	us-gaap	Other Postretirement Defined Benefit Plan Liabilities Noncurrent OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent	69774000
CY2018Q4	us-gaap	Other Receivables Net Current OtherReceivablesNetCurrent	9741000
CY2017Q4	us-gaap	Other Receivables Net Current OtherReceivablesNetCurrent	7761000
CY2018	us-gaap	Payments For Proceeds From Investments PaymentsForProceedsFromInvestments	4372000
CY2017	us-gaap	Payments For Proceeds From Investments PaymentsForProceedsFromInvestments	4168000
CY2016	us-gaap	Payments For Proceeds From Investments PaymentsForProceedsFromInvestments	4402000
CY2017	us-gaap	Payments For Proceeds From Previous Acquisition PaymentsForProceedsFromPreviousAcquisition
CY2016	us-gaap	Payments For Proceeds From Previous Acquisition PaymentsForProceedsFromPreviousAcquisition	-1500000
CY2018	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	3011000
CY2017	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	1799000
CY2016	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	104000
CY2018	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	761000
CY2017	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	380000
CY2016	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	888000
CY2018	us-gaap	Payments Of Stock Issuance Costs PaymentsOfStockIssuanceCosts	108000
CY2017	us-gaap	Payments Of Stock Issuance Costs PaymentsOfStockIssuanceCosts
CY2016	us-gaap	Payments Of Stock Issuance Costs PaymentsOfStockIssuanceCosts	562000
CY2018	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	105425000
CY2017	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	132913000
CY2016	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	161259000
CY2018	us-gaap	Pension Contributions PensionContributions	20000000
CY2017	us-gaap	Pension Contributions PensionContributions
CY2016	us-gaap	Pension Contributions PensionContributions	10000000
CY2018	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	<div style="display: inline; font-family: times new roman; font-size: 10pt"><div style="display: inline; font-family: times new roman; font-size: 10pt"><div style="display: inline; font-family: times new roman; font-size: 10pt"><div style="display: inline; font-family: times new roman; font-size: 10pt"><div style=" font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;"><div style="display: inline; text-decoration: underline;">Prior Period Re</div><div style="display: inline; text-decoration: underline;">classificatio</div><div style="display: inline; text-decoration: underline;">ns</div></div> <div style=" font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;">In <div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">2018,</div> the Company adopted Accounting Standards Update (ASU) <div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">2014</div>-<div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">09,</div> <div style="display: inline; font-style: italic;">Revenues from Contracts with Customers (Topic <div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">606</div>)</div> (ASU <div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">2014</div>-<div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">09</div>), and ASU <div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">2017</div>-<div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">07,</div> <div style="display: inline; font-style: italic;">Compensation—Retirement Benefits (Topic <div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">715</div>): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost</div> (ASU <div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">2017</div>-<div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">07</div>). See additional information under Revenue Recognition and New Accounting Standards Adopted below. The adoption of the updated standards required the reclassifications of prior period revenues, expenses, operating income and other income and deductions to conform to presentation and classification requirements under the updated standards.</div> <div style=" font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;"> </div> <div style=" font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;">The updates in ASU <div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">2014</div>-<div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">09,</div> which require the separate presentation of revenues from contracts with customers from other revenues on the face of the income statement, resulted in the separate presentation of adjustments to retail electric sales revenue under regulatory Alternative Revenue Programs (ARP’s) from revenues from contracts with customers, but did <div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">not</div> affect total operating or total electric operating revenues reported in prior years.</div> <div style=" font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;"> </div> <div style=" font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;">The updates in ASU <div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">2017</div>-<div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">07</div> require the reporting of the nonservice cost components of pension and other postretirement benefits outside of operating expense and operating income. The reclassification of these nonservice costs components has resulted in reductions in electric operation and maintenance expenses of <div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">$4,405,000</div> in <div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">2017</div> and <div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">$3,951,000</div> in <div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">2016,</div> reductions in other nonelectric expenses of <div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">$1,215,000</div> in <div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">2017</div> and <div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">$1,159,000</div> in <div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">2016</div> and increases to operating income and the separate disclosure of nonservice cost components of postretirement benefits below the operating income line of <div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">$5,620,000</div> in <div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">2017</div> and <div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">$5,110,000</div> in <div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">2016.</div></div> <div style=" font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;"> </div> <div style=" font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;">Additionally, in <div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">2018</div> the Company decided to <div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">no</div> longer separate the residual effects of discontinued operations from the results of continuing operations due to the immaterial impact of discontinued operations relative to the results of continuing operations. The effects of discontinued operations are now included in other nonelectric expenses and income tax expense, with the liabilities of discontinued operations included in accounts payable and the cash flows from discontinued operations included in changes in accounts payable and other current liabilities in the Company’s consolidated financial statements for the years ended <div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;"> December 31, 2018, </div><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">2017</div> and <div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">2016.</div></div> <div style=" font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;"> </div> <div style=" font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;">The above reclassifications resulted in <div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">no</div> changes to the Company’s net income or retained earnings for the years ended <div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;"> December 31, 2017 </div>and <div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">2016.</div></div></div></div></div></div>
CY2018	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock
CY2017	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	4349000
CY2016	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	44435000
CY2018	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	100000000
CY2017	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt
CY2016	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	130000000
CY2018	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-93772000
CY2017	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	69488000
CY2016	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-37789000
CY2018	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	2378000
CY2017	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	4491000
CY2016	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	4837000
CY2018Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	2429467000
CY2017Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	2339022000
CY2018Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1581098000
CY2017Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1539603000
CY2018Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	228120000
CY2017Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	216937000
CY2018	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	916447000
CY2017	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	849350000
CY2016	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	803539000
CY2018	us-gaap	Regulatory Asset Amortization Period RegulatoryAssetAmortizationPeriod
CY2017	us-gaap	Regulatory Asset Amortization Period RegulatoryAssetAmortizationPeriod
CY2018Q4	us-gaap	Regulatory Assets RegulatoryAssets	152482000
CY2017Q4	us-gaap	Regulatory Assets RegulatoryAssets	152127000
CY2018Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	17225000
CY2017Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	22551000
CY2018Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	135257000
CY2017Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	129576000
CY2018Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	227207000
CY2017Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	242581000
CY2018	us-gaap	Regulatory Liability Amortization Period RegulatoryLiabilityAmortizationPeriod
CY2017	us-gaap	Regulatory Liability Amortization Period RegulatoryLiabilityAmortizationPeriod
CY2018Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	738000
CY2017Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	9688000
CY2018Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	226469000
CY2017Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	232893000
CY2018	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	189000
CY2017	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	48231000
CY2016	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	87547000
CY2018Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	190433000
CY2017Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	161286000
CY2017	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	143000
CY2018	us-gaap	Stock Issued During Period Shares Restricted Stock Award Gross StockIssuedDuringPeriodSharesRestrictedStockAwardGross	18200
CY2018	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	-93000
CY2017	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	4969000
CY2016	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	45963000
CY2018	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	3011000
CY2016	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	114000
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	6000
CY2017	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	1799000
CY2016	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	104000
CY2016Q4	us-gaap	Stockholders Equity StockholdersEquity	670104000
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	728863000
CY2016	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	97000
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	4441000
CY2017	us-gaap	Share Based Compensation ShareBasedCompensation	3642000
CY2016	us-gaap	Share Based Compensation ShareBasedCompensation	3178000
CY2018Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	18599000
CY2017Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	112371000
CY2018Q4	us-gaap	Short Term Debt Weighted Average Interest Rate ShortTermDebtWeightedAverageInterestRate	0.039
CY2018	us-gaap	Shortterm Debt Average Outstanding Amount ShorttermDebtAverageOutstandingAmount	27100000
	us-gaap	Standard Product Warranty Accrual Payments StandardProductWarrantyAccrualPayments	0
CY2015Q4	us-gaap	Stockholders Equity StockholdersEquity	605023000
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	696892000
CY2018Q4	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	23626000
CY2017Q4	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	22427000
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	684000
CY2016Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	891000
CY2015Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	468000
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1282000
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions
CY2017	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	172000
CY2016	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	186000
CY2017	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	206000
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	778000
CY2017	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	28000
CY2016	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	406000
CY2018Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	0
CY2018	us-gaap	Use Of Estimates UseOfEstimates	<div style="display: inline; font-family: times new roman; font-size: 10pt"><div style="display: inline; font-family: times new roman; font-size: 10pt"><div style="display: inline; font-family: times new roman; font-size: 10pt"><div style="display: inline; font-family: times new roman; font-size: 10pt"><div style=" font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;"><div style="display: inline; text-decoration: underline;">U</div><div style="display: inline; text-decoration: underline;">se of Estimates</div></div> <div style=" font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;">The Company uses estimates based on the best information available in recording transactions and balances resulting from business operations. As better information becomes available (or actual amounts are known), the recorded estimates are revised. Consequently, operating results can be affected by revisions to prior accounting estimates.</div></div></div></div></div>
CY2018	us-gaap	Utilities Operating Expense Fuel Used UtilitiesOperatingExpenseFuelUsed	66815000
CY2017	us-gaap	Utilities Operating Expense Fuel Used UtilitiesOperatingExpenseFuelUsed	59690000
CY2016	us-gaap	Utilities Operating Expense Fuel Used UtilitiesOperatingExpenseFuelUsed	54792000
CY2018	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	155534000
CY2017	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	146914000
CY2016	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	147274000
CY2018	us-gaap	Utilities Operating Expense Other UtilitiesOperatingExpenseOther	15585000
CY2017	us-gaap	Utilities Operating Expense Other UtilitiesOperatingExpenseOther	15053000
CY2016	us-gaap	Utilities Operating Expense Other UtilitiesOperatingExpenseOther	14266000
CY2018	us-gaap	Utilities Operating Expense Purchased Power UtilitiesOperatingExpensePurchasedPower	354559000
CY2017	us-gaap	Utilities Operating Expense Purchased Power UtilitiesOperatingExpensePurchasedPower	316562000
CY2016	us-gaap	Utilities Operating Expense Purchased Power UtilitiesOperatingExpensePurchasedPower	295222000
CY2018	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	292252
CY2017	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	291086
CY2016	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	184551
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	39892196
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	39748347
CY2016	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	38731010
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	39599944
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	39457261
CY2016	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	38546459

Files In Submission

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2017 Q4 Form 10-K Financial Statement

#000143774919003150 Filed on February 22, 2019

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$OTTR Otter Tail Corp Stock $ottr

2017 Q4 Form 10-K Financial Statement

#000143774919003150 Filed on February 22, 2019

Income Statement

Balance Sheet

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Facts In Submission

Files In Submission

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Otter Tail Corp Stock $ottr