$CPK
CHESAPEAKE UTILITIES CORP Stock $cpk

$cpk Overview Financials Valuation SEC Filings Company Website

2016 Q4 Form 10-K Financial Statement

#000162828018002594 Filed on March 01, 2018

Income Statement

Concept	2016 Q4	2016 Q3	2016 Q2
Revenue	$141.9M	$108.3M	$102.3M
YoY Change	35.68%	17.88%	10.42%
Cost Of Revenue	$71.70M	$52.80M	$44.60M
YoY Change	58.63%	28.47%	7.73%
Gross Profit	$70.20M	$55.50M	$57.70M
YoY Change	18.18%	9.25%	12.48%
Gross Profit Margin	49.48%	51.22%	56.38%
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$8.700M	$8.209M	$7.780M
YoY Change	11.54%	7.5%	3.14%
% of Gross Profit	12.39%	14.79%	13.48%
Operating Expenses	$48.40M	$98.19M	$86.60M
YoY Change	12.04%	21.22%	8.91%
Operating Profit	$21.82M	$10.16M	$15.74M
YoY Change	34.93%	-6.9%	19.53%
Interest Expense	-$2.600M	$2.722M	$2.624M
YoY Change	0.0%	9.23%	5.59%
% of Operating Profit	-11.92%	26.8%	16.67%
Other Income/Expense, Net	-$400.0K	-$28.00K	-$8.000K
YoY Change	-233.33%	-177.78%	-95.32%
Pretax Income	$18.80M	$7.406M	$13.11M
YoY Change	35.25%	-12.39%	24.69%
Income Tax	$6.900M	$2.990M	$5.081M
% Of Pretax Income	36.7%	40.37%	38.76%
Net Earnings	$11.86M	$4.416M	$8.029M
YoY Change	37.64%	-13.73%	27.57%
Net Earnings / Revenue	8.36%	4.08%	7.85%
Basic Earnings Per Share	$0.73	$0.29	$0.52
Diluted Earnings Per Share	$0.73	$0.29	$0.52
COMMON SHARES
Basic Shares Outstanding	16.30M shares	15.37M shares	15.32M shares
Diluted Shares Outstanding		15.41M shares	15.35M shares

Balance Sheet

Concept	2016 Q4	2016 Q3	2016 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments	$4.200M	$1.500M	$3.300M
YoY Change	44.83%	-60.53%	57.14%
Cash & Equivalents	$4.178M	$1.536M	$3.266M
Short-Term Investments
Other Short-Term Assets	$2.470M	$543.0K	$771.0K
YoY Change	136.59%	60.18%	170.53%
Inventory	$16.50M	$16.20M	$13.30M
Prepaid Expenses	$6.792M	$7.603M	$4.184M
Receivables	$62.80M	$47.10M	$41.85M
Other Receivables	$22.90M	$13.20M	$7.400M
Total Short-Term Assets	$141.2M	$102.2M	$86.90M
YoY Change	26.36%	16.5%	10.67%
LONG-TERM ASSETS
Property, Plant & Equipment	$986.7M	$936.0M	$908.8M
YoY Change	15.41%	14.27%	14.97%
Goodwill	$15.07M	$15.07M	$15.07M
YoY Change	3.59%	-6.09%	-6.09%
Intangibles	$1.843M	$1.938M	$2.033M
YoY Change	-17.06%	-16.36%	-15.82%
Long-Term Investments	$4.900M	$4.600M	$4.300M
YoY Change	36.11%	35.29%	16.22%
Other Assets	$76.80M	$76.30M	$76.60M
YoY Change	-0.9%	-1.29%	-1.42%
Total Long-Term Assets	$1.088B	$1.038B	$1.010B
YoY Change	13.85%	12.77%	13.23%
TOTAL ASSETS
Total Short-Term Assets	$141.2M	$102.2M	$86.90M
Total Long-Term Assets	$1.088B	$1.038B	$1.010B
Total Assets	$1.229B	$1.141B	$1.097B
YoY Change	15.16%	13.1%	13.02%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$56.94M	$41.30M	$35.50M
YoY Change	44.87%	0.41%	-7.01%
Accrued Expenses	$18.90M	$21.20M	$17.00M
YoY Change	2.72%	-1.85%	3.03%
Deferred Revenue
YoY Change
Short-Term Debt	$209.9M	$154.5M	$180.0M
YoY Change	21.03%	21.56%	90.09%
Long-Term Debt Due	$12.10M	$12.09M	$12.08M
YoY Change	32.22%	32.26%	32.3%
Total Short-Term Liabilities	$334.1M	$263.1M	$283.9M
YoY Change	19.48%	11.06%	42.22%
LONG-TERM LIABILITIES
Long-Term Debt	$137.0M	$143.5M	$143.9M
YoY Change	-8.09%	-7.94%	-7.92%
Other Long-Term Liabilities	$4.750M	$5.533M	$5.560M
YoY Change	82.9%	76.77%	45.55%
Total Long-Term Liabilities	$141.7M	$149.1M	$149.4M
YoY Change	-6.53%	-6.28%	-6.65%
TOTAL LIABILITIES
Total Short-Term Liabilities	$334.1M	$263.1M	$283.9M
Total Long-Term Liabilities	$141.7M	$149.1M	$149.4M
Total Liabilities	$475.8M	$412.1M	$433.3M
YoY Change	10.33%	4.09%	20.47%
SHAREHOLDERS EQUITY
Retained Earnings	$192.1M	$185.2M	$185.5M
YoY Change	15.54%	14.29%	14.97%
Common Stock	$258.9M	$258.1M	$199.2M
YoY Change	30.93%	31.2%	2.0%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$2.416M	$2.476M	$2.452M
YoY Change	28.31%	32.9%	33.04%
Treasury Stock Shares
Shareholders Equity	$446.1M	$438.3M	$379.6M
YoY Change
Total Liabilities & Shareholders Equity	$1.229B	$1.141B	$1.097B
YoY Change	15.16%	13.1%	13.02%

Cashflow Statement

Concept	2016 Q4	2016 Q3	2016 Q2
OPERATING ACTIVITIES
Net Income	$11.86M	$4.416M	$8.029M
YoY Change	37.64%	-13.73%	27.57%
Depreciation, Depletion And Amortization	$8.700M	$8.209M	$7.780M
YoY Change	11.54%	7.5%	3.14%
Cash From Operating Activities	$18.40M	$8.000M	$33.60M
YoY Change	70.37%	-40.74%	85.64%
INVESTING ACTIVITIES
Capital Expenditures	-$60.30M	-$36.80M	-$35.00M
YoY Change	30.24%	-7.77%	9.72%
Acquisitions
YoY Change
Other Investing Activities	-$100.0K	$0.00	-$100.0K
YoY Change		-100.0%	-99.53%
Cash From Investing Activities	-$60.30M	-$36.80M	-$35.10M
YoY Change	30.24%	-7.77%	-33.77%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	44.50M	27.10M	1.400M
YoY Change	28.61%	-3.56%	-93.27%
NET CHANGE
Cash From Operating Activities	18.40M	8.000M	33.60M
Cash From Investing Activities	-60.30M	-36.80M	-35.10M
Cash From Financing Activities	44.50M	27.10M	1.400M
Net Change In Cash	2.600M	-1.700M	-100.0K
YoY Change	-388.89%	-200.0%	-99.29%
FREE CASH FLOW
Cash From Operating Activities	$18.40M	$8.000M	$33.60M
Capital Expenditures	-$60.30M	-$36.80M	-$35.00M
Free Cash Flow	$78.70M	$44.80M	$68.60M
YoY Change	37.83%	-16.1%	37.2%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2016Q4	cpk	Accounts Payable Subject To Master Netting Arrangement AccountsPayableSubjectToMasterNettingArrangement	1431000	USD
CY2017Q4	cpk	Accounts Payable Subject To Master Netting Arrangement AccountsPayableSubjectToMasterNettingArrangement	2391000	USD
CY2016Q4	cpk	Accounts Receivable Subjectto Master Netting Arrangement AccountsReceivableSubjecttoMasterNettingArrangement	1431000	USD
CY2017Q4	cpk	Accounts Receivable Subjectto Master Netting Arrangement AccountsReceivableSubjecttoMasterNettingArrangement	2391000	USD
CY2016Q4	cpk	Accrued Revenue AccruedRevenue	16986000	USD
CY2017Q4	cpk	Accrued Revenue AccruedRevenue	22279000	USD
CY2017Q4	cpk	Accumulated Other Comprehensive Income Loss Tax Effect AccumulatedOtherComprehensiveIncomeLossTaxEffect	3100000	USD
CY2017	cpk	Amortization Of Pre Merger Regulatory Asset AmortizationOfPreMergerRegulatoryAsset	769000	USD
CY2017Q4	cpk	Annual Estimate Of Volume Of Propane To Be Purchased AnnualEstimateOfVolumeOfPropaneToBePurchased	2700000	gal
CY2015	cpk	Capital Expenditure CapitalExpenditure	195261000	USD
CY2016	cpk	Capital Expenditure CapitalExpenditure	169376000	USD
CY2017	cpk	Capital Expenditure CapitalExpenditure	191103000	USD
CY2017Q4	cpk	Common Stock Equity To Total Capitalization CommonStockEquityToTotalCapitalization	0.4
CY2017	cpk	Companys Exposure In Number Of Former Manufactured Gas Plant Sites CompanysExposureInNumberOfFormerManufacturedGasPlantSites	7	site
CY2017Q4	cpk	Cumulative Consolidated Net Income CumulativeConsolidatedNetIncome	387700000	USD
CY2017Q4	cpk	Debt Instrument Restrictive Covenants Required Net Book Valueof Regulated Business Assets Percentageof Consolidated Total Assets DebtInstrumentRestrictiveCovenantsRequiredNetBookValueofRegulatedBusinessAssetsPercentageofConsolidatedTotalAssets	0.5
CY2017Q4	cpk	Debt Service Coverage Ratio DebtServiceCoverageRatio	1.25
CY2017Q4	cpk	Deferrals Rates After Deferral Period Ends Minimum DeferralsRatesAfterDeferralPeriodEndsMinimum	0.01
CY2016Q4	cpk	Deferred Charges And Other Assets DeferredChargesAndOtherAssets	101404000	USD
CY2017Q4	cpk	Deferred Charges And Other Assets DeferredChargesAndOtherAssets	112820000	USD
CY2017	cpk	Deferred Compensation Employer Matching Contribution Rate DeferredCompensationEmployerMatchingContributionRate	0.06
CY2016Q4	cpk	Deferred Income Tax On Acquisition Adjustment DeferredIncomeTaxOnAcquisitionAdjustment	14840000	USD
CY2017Q4	cpk	Deferred Income Tax On Acquisition Adjustment DeferredIncomeTaxOnAcquisitionAdjustment	9323000	USD
CY2017	cpk	Deferred Revenue Refund Payment Period DeferredRevenueRefundPaymentPeriod	P1Y
CY2016Q4	cpk	Deferred Tax Asset Self Insurance Accruals DeferredTaxAssetSelfInsuranceAccruals	189000	USD
CY2017Q4	cpk	Deferred Tax Asset Self Insurance Accruals DeferredTaxAssetSelfInsuranceAccruals	164000	USD
CY2016Q4	cpk	Deferred Tax Assets Environmental DeferredTaxAssetsEnvironmental	2592000	USD
CY2017Q4	cpk	Deferred Tax Assets Environmental DeferredTaxAssetsEnvironmental	1744000	USD
CY2016Q4	cpk	Deferred Tax Liabilities Loss On Reacquired Debt DeferredTaxLiabilitiesLossOnReacquiredDebt	1846000	USD
CY2017Q4	cpk	Deferred Tax Liabilities Loss On Reacquired Debt DeferredTaxLiabilitiesLossOnReacquiredDebt	2574000	USD
CY2016Q4	cpk	Defined Benefit Plan Alternative Investments Fair Valueof Plan Assets DefinedBenefitPlanAlternativeInvestmentsFairValueofPlanAssets	6233000	USD
CY2017Q4	cpk	Defined Benefit Plan Alternative Investments Fair Valueof Plan Assets DefinedBenefitPlanAlternativeInvestmentsFairValueofPlanAssets	7248000	USD
CY2016Q4	cpk	Defined Benefit Plan Fair Valueof Plan Assets Excluding Net Asset Value Investments DefinedBenefitPlanFairValueofPlanAssetsExcludingNetAssetValueInvestments	45707000	USD
CY2017Q4	cpk	Defined Benefit Plan Fair Valueof Plan Assets Excluding Net Asset Value Investments DefinedBenefitPlanFairValueofPlanAssetsExcludingNetAssetValueInvestments	50498000	USD
CY2017Q4	cpk	Defined Benefit Plan Numberof Plans DefinedBenefitPlanNumberofPlans	2
CY2017	cpk	Ratiobasedonaveragenumberofpriorquarters Ratiobasedonaveragenumberofpriorquarters	6
CY2016Q4	cpk	Receivables And Other Deferred Charges ReceivablesAndOtherDeferredCharges	2786000	USD
CY2017Q4	cpk	Receivables And Other Deferred Charges ReceivablesAndOtherDeferredCharges	3699000	USD
CY2017Q4	cpk	Defined Benefit Plan Numberof Plans DefinedBenefitPlanNumberofPlans	3	plan
CY2017Q4	cpk	Defined Benefit Plan Post Merger Regulatory Assets DefinedBenefitPlanPostMergerRegulatoryAssets	14169000	USD
CY2017Q4	cpk	Defined Benefit Plan Pre Merger Regulatory Assets DefinedBenefitPlanPreMergerRegulatoryAssets	1326000	USD
CY2017Q4	cpk	Defined Benefit Plan Regulatory Assets Before Premerger DefinedBenefitPlanRegulatoryAssetsBeforePremerger	22021000	USD
CY2017	cpk	Defined Contribution Plan Eligibility Threshold Requisite Service Period DefinedContributionPlanEligibilityThresholdRequisiteServicePeriod	P3M
CY2017	cpk	Defined Contribution Plan Maximum Employer Contribution As Percentage Of Eligible Compensation DefinedContributionPlanMaximumEmployerContributionAsPercentageOfEligibleCompensation	1
CY2017	cpk	Delayof Revenue Recognition Due To Implementationof New Standard DelayofRevenueRecognitionDueToImplementationofNewStandard	407000	USD
CY2015	cpk	Depreciation And Accretion Included In Other Costs DepreciationAndAccretionIncludedInOtherCosts	6978000	USD
CY2016	cpk	Depreciation And Accretion Included In Other Costs DepreciationAndAccretionIncludedInOtherCosts	7334000	USD
CY2017	cpk	Depreciation And Accretion Included In Other Costs DepreciationAndAccretionIncludedInOtherCosts	8122000	USD
CY2017	cpk	Employee Deferral Rate EmployeeDeferralRate	0.8
CY2017	cpk	Employee Minimum Age To Participate Under Defined Contribution Plan EmployeeMinimumAgeToParticipateUnderDefinedContributionPlan	P55Y
CY2017	cpk	Expected Amortization Of Pre Merger Regulatory Asset ExpectedAmortizationOfPreMergerRegulatoryAsset	0	USD
CY2017Q4	cpk	Line Of Credit Facility Maximum Borrowing Committed Capacity LineOfCreditFacilityMaximumBorrowingCommittedCapacity	220000000	USD
CY2016Q4	cpk	Longterm Debtand Capital Lease Obligations Netof Current Maturities LongtermDebtandCapitalLeaseObligationsNetofCurrentMaturities	136954000	USD
CY2017Q4	cpk	Longterm Debtand Capital Lease Obligations Netof Current Maturities LongtermDebtandCapitalLeaseObligationsNetofCurrentMaturities	197395000	USD
CY2017	cpk	Maturity Period To Be Considered Cash Equivalents MaturityPeriodToBeConsideredCashEquivalents	3
CY2017	cpk	Maximum Authorized Amount Under Corporate Guarantees And Letters Of Credit MaximumAuthorizedAmountUnderCorporateGuaranteesAndLettersOfCredit	95000000	USD
CY2017	cpk	Maximum Days To Make Default Good MaximumDaysToMakeDefaultGood	P5D
CY2017Q4	cpk	Maximum Debt To Net Capital Ratio Under Agreement Two MaximumDebtToNetCapitalRatioUnderAgreementTwo	65
CY2017Q4	cpk	Minimum Interest Coverage Ratio Under Agreement Two MinimumInterestCoverageRatioUnderAgreementTwo	2
CY2015	cpk	Non Cash Performance Incentive Plan Expenses NonCashPerformanceIncentivePlanExpenses	1594000	USD
CY2016	cpk	Non Cash Performance Incentive Plan Expenses NonCashPerformanceIncentivePlanExpenses	1027000	USD
CY2017	cpk	Non Cash Performance Incentive Plan Expenses NonCashPerformanceIncentivePlanExpenses	1127000	USD
CY2015	cpk	Non Cash Retirement Savings Plan Expenses NonCashRetirementSavingsPlanExpenses	690000	USD
CY2016	cpk	Non Cash Retirement Savings Plan Expenses NonCashRetirementSavingsPlanExpenses	777000	USD
CY2017	cpk	Non Cash Retirement Savings Plan Expenses NonCashRetirementSavingsPlanExpenses	0	USD
CY2017	cpk	Number Of Financial Institutions With Bank Credit Facilities NumberOfFinancialInstitutionsWithBankCreditFacilities	4
CY2017	cpk	Number Of Unsecured Bank Credit Facilities NumberOfUnsecuredBankCreditFacilities	5
CY2013Q2	cpk	Number Of Years To Purchase Propane Under Contract NumberOfYearsToPurchasePropaneUnderContract	P6Y
CY2017	cpk	Number Of Yearsto Collect Benefits NumberOfYearstoCollectBenefits	P20Y
CY2017	cpk	Numberof Utilitiesthatdonothavecostrecoverymechanism NumberofUtilitiesthatdonothavecostrecoverymechanism	2
CY2017Q4	cpk	Numberofcontractsaffectingnewrevenuerecognitionprincipleadoption Numberofcontractsaffectingnewrevenuerecognitionprincipleadoption	1
CY2017	cpk	Operating Lease Term OperatingLeaseTerm	P20Y
CY2015	cpk	Operations Operations	107562000	USD
CY2016	cpk	Operations Operations	117571000	USD
CY2017	cpk	Operations Operations	127571000	USD
CY2017Q4	cpk	Participating Lenders In The Revolver ParticipatingLendersInTheRevolver	5
CY2017	cpk	Paymentsto Acquire Capital Leases PaymentstoAcquireCapitalLeases	1500000	USD
CY2017Q4	cpk	Percentageof Net Operating Losses Limitedupon Tax Reform Enactment PercentageofNetOperatingLossesLimiteduponTaxReformEnactment	0.8
CY2017Q4	cpk	Preferredstockpriceperunit Preferredstockpriceperunit	70
CY2017	cpk	Reevaluationof Deferred Income Taxesduetotaxreform ReevaluationofDeferredIncomeTaxesduetotaxreform	98500000	USD
CY2015	cpk	Regulated Energy Cost Of Sales RegulatedEnergyCostOfSales	122814000	USD
CY2016	cpk	Regulated Energy Cost Of Sales RegulatedEnergyCostOfSales	109609000	USD
CY2017	cpk	Regulated Energy Cost Of Sales RegulatedEnergyCostOfSales	118769000	USD
CY2017Q4	cpk	Required Fixed Charge Coverage Ratio RequiredFixedChargeCoverageRatio	1.2
CY2017Q4	cpk	Restricted Payment RestrictedPayment	178000000	USD
CY2015Q4	cpk	Shares Held In Trust For Deferred Compensation Plan SharesHeldInTrustForDeferredCompensationPlan	70631	shares
CY2016Q4	cpk	Shares Held In Trust For Deferred Compensation Plan SharesHeldInTrustForDeferredCompensationPlan	76745	shares
CY2017Q4	cpk	Shares Held In Trust For Deferred Compensation Plan SharesHeldInTrustForDeferredCompensationPlan	90961	shares
CY2015	cpk	Shares Issued Under Performance Incentive Plan Withheld For Employee Taxes SharesIssuedUnderPerformanceIncentivePlanWithheldForEmployeeTaxes	12620	shares
CY2016	cpk	Shares Issued Under Performance Incentive Plan Withheld For Employee Taxes SharesIssuedUnderPerformanceIncentivePlanWithheldForEmployeeTaxes	12031	shares
CY2017	cpk	Shares Issued Under Performance Incentive Plan Withheld For Employee Taxes SharesIssuedUnderPerformanceIncentivePlanWithheldForEmployeeTaxes	10269	shares
CY2017	cpk	Standby Letters Of Credit StandbyLettersOfCredit	5000000	USD
CY2015	cpk	Stock Issued During The Period Value Retirement Savings Plan And Dividend Reinvestment Plan StockIssuedDuringThePeriodValueRetirementSavingsPlanAndDividendReinvestmentPlan	2235000	USD
CY2016	cpk	Stock Issued During The Period Value Retirement Savings Plan And Dividend Reinvestment Plan StockIssuedDuringThePeriodValueRetirementSavingsPlanAndDividendReinvestmentPlan	2242000	USD
CY2016	cpk	Treasury Stock Activity And Deferred Compensation Plan Activity During Period Value TreasuryStockActivityAndDeferredCompensationPlanActivityDuringPeriodValue	0	USD
CY2015	cpk	Unregulated Energy And Other Cost Of Sales UnregulatedEnergyAndOtherCostOfSales	97228000	USD
CY2016	cpk	Unregulated Energy And Other Cost Of Sales UnregulatedEnergyAndOtherCostOfSales	128434000	USD
CY2017	cpk	Unregulated Energy And Other Cost Of Sales UnregulatedEnergyAndOtherCostOfSales	219145000	USD
CY2016Q4	cpk	Unregulated Energy Property Plant And Equipment UnregulatedEnergyPropertyPlantAndEquipment	196800000	USD
CY2017Q4	cpk	Unregulated Energy Property Plant And Equipment UnregulatedEnergyPropertyPlantAndEquipment	210682000	USD
CY2017Q4	cpk	Unrestricted Payment UnrestrictedPayment	209700000	USD
CY2017	dei	Amendment Flag AmendmentFlag	false
CY2017	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2017	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2017	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2017
CY2017	dei	Document Period End Date DocumentPeriodEndDate	2017-12-31
CY2017	dei	Document Type DocumentType	10-K
CY2017	dei	Entity Central Index Key EntityCentralIndexKey	0000019745
CY2018Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	16344442	shares
CY2017	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2017	dei	Entity Filer Category EntityFilerCategory	Accelerated Filer
CY2017Q2	dei	Entity Public Float EntityPublicFloat	1200000000	USD
CY2017	dei	Entity Registrant Name EntityRegistrantName	CHESAPEAKE UTILITIES CORP
CY2017	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2017	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	No
CY2017	dei	Trading Symbol TradingSymbol	CPK
CY2016Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	56935000	USD
CY2017Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	74688000	USD
CY2016Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	62803000	USD
CY2017Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	77223000	USD
CY2016Q4	us-gaap	Accrued Environmental Loss Contingencies Noncurrent AccruedEnvironmentalLossContingenciesNoncurrent	8592000	USD
CY2017Q4	us-gaap	Accrued Environmental Loss Contingencies Noncurrent AccruedEnvironmentalLossContingenciesNoncurrent	8263000	USD
CY2016Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	245207000	USD
CY2017Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	270599000	USD
CY2015Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-5840000	USD
CY2016Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-4878000	USD
CY2017Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-4272000	USD
CY2016Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	250967000	USD
CY2017Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	253470000	USD
CY2015	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	1937000	USD
CY2016	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	2367000	USD
CY2017	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	2490000	USD
CY2015	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	1157000	USD
CY2016	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	1415000	USD
CY2017	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	1487000	USD
CY2016Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	909000	USD
CY2017Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	936000	USD
CY2015	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	367000	USD
CY2016	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	380000	USD
CY2017	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	537000	USD
CY2015	us-gaap	Amortization Of Leased Asset AmortizationOfLeasedAsset	1300000	USD
CY2016	us-gaap	Amortization Of Leased Asset AmortizationOfLeasedAsset	1400000	USD
CY2017	us-gaap	Amortization Of Leased Asset AmortizationOfLeasedAsset	1400000	USD
CY2017Q4	us-gaap	Amount Of Restricted Net Assets For Consolidated And Unconsolidated Subsidiaries AmountOfRestrictedNetAssetsForConsolidatedAndUnconsolidatedSubsidiaries	43000000	USD
CY2015	us-gaap	Asset Impairment Charges AssetImpairmentCharges	-1500000	USD
CY2016	us-gaap	Asset Impairment Charges AssetImpairmentCharges	-130000	USD
CY2017	us-gaap	Asset Impairment Charges AssetImpairmentCharges	-130000	USD
CY2016Q4	us-gaap	Assets Assets	1229219000	USD
CY2017Q4	us-gaap	Assets Assets	1417434000	USD
CY2016Q4	us-gaap	Assets Current AssetsCurrent	141151000	USD
CY2017Q4	us-gaap	Assets Current AssetsCurrent	178587000	USD
CY2016Q4	us-gaap	Bank Overdrafts BankOverdrafts	8560000	USD
CY2017Q4	us-gaap	Bank Overdrafts BankOverdrafts	10298000	USD
CY2015Q4	us-gaap	Business Acquisition Equity Interest Issued Or Issuable Value Assigned BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned	30164000	USD
CY2016Q4	us-gaap	Business Acquisition Equity Interest Issued Or Issuable Value Assigned BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned	0	USD
CY2017Q4	us-gaap	Business Acquisition Equity Interest Issued Or Issuable Value Assigned BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned	0	USD
CY2015Q2	us-gaap	Business Acquisition Equity Interests Issued Or Issuable Number Of Shares Issued BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued	592970	shares
CY2014	us-gaap	Business Combination Separately Recognized Transactions Additional Disclosures Acquisition Cost Expensed BusinessCombinationSeparatelyRecognizedTransactionsAdditionalDisclosuresAcquisitionCostExpensed	786000	USD
CY2015	us-gaap	Business Combination Separately Recognized Transactions Additional Disclosures Acquisition Cost Expensed BusinessCombinationSeparatelyRecognizedTransactionsAdditionalDisclosuresAcquisitionCostExpensed	514000	USD
CY2015	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	10268000	USD
CY2016	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	9791000	USD
CY2017	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	15457000	USD
CY2016Q4	us-gaap	Capital Lease Obligations CapitalLeaseObligations	3471000	USD
CY2017Q4	us-gaap	Capital Lease Obligations CapitalLeaseObligations	2070000	USD
CY2015	us-gaap	Capital Lease Obligations Incurred CapitalLeaseObligationsIncurred	4824000	USD
CY2016	us-gaap	Capital Lease Obligations Incurred CapitalLeaseObligationsIncurred	3471000	USD
CY2017	us-gaap	Capital Lease Obligations Incurred CapitalLeaseObligationsIncurred	2070000	USD
CY2013Q2	us-gaap	Capital Leased Assets Noncurrent Fair Value Disclosure CapitalLeasedAssetsNoncurrentFairValueDisclosure	7100000	USD
CY2016Q4	us-gaap	Capital Leases Balance Sheet Assets By Major Class Net CapitalLeasesBalanceSheetAssetsByMajorClassNet	3400000	USD
CY2017Q4	us-gaap	Capital Leases Balance Sheet Assets By Major Class Net CapitalLeasesBalanceSheetAssetsByMajorClassNet	2000000	USD
CY2017Q4	us-gaap	Capital Leases Future Minimum Payments Due CapitalLeasesFutureMinimumPaymentsDue	2100000	USD
CY2017Q4	us-gaap	Capital Leases Future Minimum Payments Due Current CapitalLeasesFutureMinimumPaymentsDueCurrent	1500000	USD
CY2017Q4	us-gaap	Capital Leases Future Minimum Payments Due In Two Years CapitalLeasesFutureMinimumPaymentsDueInTwoYears	625000	USD
CY2016Q4	us-gaap	Capitalization Longterm Debt And Equity CapitalizationLongtermDebtAndEquity	583040000	USD
CY2017Q4	us-gaap	Capitalization Longterm Debt And Equity CapitalizationLongtermDebtAndEquity	683689000	USD
CY2014Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	4574000	USD
CY2015Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	2855000	USD
CY2016Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	4178000	USD
CY2017Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	5614000	USD
CY2015	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-1719000	USD
CY2016	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	1323000	USD
CY2017	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	1436000	USD
CY2016	us-gaap	Change In Unrealized Gain Loss On Fair Value Hedging Instruments1 ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1	-233000	USD
CY2016	us-gaap	Change In Unrealized Gain Loss On Hedged Item In Fair Value Hedge1 ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1	681000	USD
CY2016Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2017Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2017Q4	us-gaap	Common Stock Capital Shares Reserved For Future Issuance CommonStockCapitalSharesReservedForFutureIssuance	831183	shares
CY2015	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.1325
CY2016	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.2025
CY2017	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.2800
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CY2017Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.4867
CY2016Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	50000000	shares
CY2017Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	50000000	shares
CY2016Q4	us-gaap	Common Stock Value CommonStockValue	7935000	USD
CY2017Q4	us-gaap	Common Stock Value CommonStockValue	7955000	USD
CY2016Q4	us-gaap	Compensation And Benefits Trust CompensationAndBenefitsTrust	2416000	USD
CY2017Q4	us-gaap	Compensation And Benefits Trust CompensationAndBenefitsTrust	3395000	USD
CY2015	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	40976000	USD
CY2016	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	45637000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	58730000	USD
CY2016Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	56276000	USD
CY2017Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	84509000	USD
CY2015Q4	us-gaap	Contributions In Aid Of Construction ContributionsInAidOfConstruction	1700000	USD
CY2016Q4	us-gaap	Contributions In Aid Of Construction ContributionsInAidOfConstruction	1000000	USD
CY2017Q4	us-gaap	Contributions In Aid Of Construction ContributionsInAidOfConstruction	2100000	USD
CY2017Q4	us-gaap	Cumulative Effect Of New Accounting Principle In Period Of Adoption CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	1500000	USD
CY2015	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	4875000	USD
CY2016	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-4898000	USD
CY2017	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	2803000	USD
CY2015	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	6385000	USD
CY2016	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	-2916000	USD
CY2017	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	3224000	USD
CY2015	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	1533000	USD
CY2016	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	2053000	USD
CY2017	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	492000	USD
CY2016Q4	us-gaap	Customer Advances And Deposits Current CustomerAdvancesAndDepositsCurrent	29238000	USD
CY2017Q4	us-gaap	Customer Advances And Deposits Current CustomerAdvancesAndDepositsCurrent	34751000	USD
CY2017Q4	us-gaap	Debt Instrument Unused Borrowing Capacity Amount DebtInstrumentUnusedBorrowingCapacityAmount	80000000	USD
CY2017	us-gaap	Deferred Compensation Arrangement With Individual Requisite Service Period1 DeferredCompensationArrangementWithIndividualRequisiteServicePeriod1	P2Y
CY2016Q4	us-gaap	Deferred Credits And Other Liabilities DeferredCreditsAndOtherLiabilities	312128000	USD
CY2017Q4	us-gaap	Deferred Credits And Other Liabilities DeferredCreditsAndOtherLiabilities	320745000	USD
CY2016	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	0	USD
CY2017	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	98492000	USD
CY2015	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	20520000	USD
CY2016	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	31257000	USD
CY2017	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	11085000	USD
CY2016Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	222894000	USD
CY2017Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	135850000	USD
CY2015	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	2100000	USD
CY2017	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	900000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	18683000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	15203000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	952000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	1625000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards State And Local DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal	893000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards State And Local DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal	1586000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	4946000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	6255000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	2643000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	0	USD
CY2016Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits	6230000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits	4698000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Reserves DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves	1131000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Reserves DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves	717000	USD
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CY2017Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	151053000	USD
CY2016Q4	us-gaap	Deferred Tax Liabilities Deferred Expense DeferredTaxLiabilitiesDeferredExpense	442000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Deferred Expense DeferredTaxLiabilitiesDeferredExpense	153000	USD
CY2016Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	222894000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	135850000	USD
CY2016Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	6375000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	5422000	USD
CY2016Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	218074000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	133581000	USD
CY2017Q4	us-gaap	Defined Benefit Plan Accumulated Benefit Obligation DefinedBenefitPlanAccumulatedBenefitObligation	23347000	USD
CY2017Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax	-7852000	USD
CY2017Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Net Gains Losses After Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesAfterTax	944000	USD
CY2015	us-gaap	Defined Benefit Plan Amortization Of Prior Service Cost Credit DefinedBenefitPlanAmortizationOfPriorServiceCostCredit	9000	USD
CY2016	us-gaap	Defined Benefit Plan Amortization Of Prior Service Cost Credit DefinedBenefitPlanAmortizationOfPriorServiceCostCredit	0	USD
CY2017	us-gaap	Defined Benefit Plan Amortization Of Prior Service Cost Credit DefinedBenefitPlanAmortizationOfPriorServiceCostCredit	0	USD
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CY2017	us-gaap	Defined Benefit Plan Amounts Recognized In Other Comprehensive Income Net Prior Service Cost Credit Before Tax DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax	-601000	USD
CY2015	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate	0.035
CY2016	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate	0.0375
CY2017	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate	0.0375
CY2017	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Decrease On Accumulated Postretirement Benefit Obligation1 DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnAccumulatedPostretirementBenefitObligation1	215000	USD
CY2017	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Decrease On Service And Interest Cost Components1 DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnServiceAndInterestCostComponents1	8000	USD
CY2017	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Increase On Accumulated Postretirement Benefit Obligation DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnAccumulatedPostretirementBenefitObligation	277000	USD
CY2017	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Increase On Service And Interest Cost Components DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents	11000	USD
CY2017Q4	us-gaap	Defined Benefit Plan Expected Amortization Of Gain Loss Next Fiscal Year DefinedBenefitPlanExpectedAmortizationOfGainLossNextFiscalYear	-87000	USD
CY2017Q4	us-gaap	Defined Benefit Plan Expected Amortization Of Prior Service Cost Credit Next Fiscal Year DefinedBenefitPlanExpectedAmortizationOfPriorServiceCostCreditNextFiscalYear	-77000	USD
CY2016Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	51940000	USD
CY2017Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	57746000	USD
CY2015	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	91000	USD
CY2016	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	91000	USD
CY2017	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	89000	USD
CY2015	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	199000	USD
CY2016	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	178000	USD
CY2017	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	176000	USD
CY2015	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	4100000	USD
CY2016	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	4500000	USD
CY2017	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	5000000	USD
CY2017	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent Of Match DefinedContributionPlanEmployerMatchingContributionPercentOfMatch	0.06
CY2017	us-gaap	Defined Contribution Plan Employers Matching Contribution Annual Vesting Percentage DefinedContributionPlanEmployersMatchingContributionAnnualVestingPercentage	1
CY2015	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	7000000	USD
CY2016	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	7300000	USD
CY2017	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	8100000	USD
CY2015	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	29972000	USD
CY2016	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	32159000	USD
CY2017	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	36599000	USD
CY2017	us-gaap	Derivative Instruments Gain Loss Reclassified From Accumulated Oci Into Income Effective Portion Net DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet	520000	USD
CY2017	us-gaap	Derivative Nonmonetary Notional Amount Volume DerivativeNonmonetaryNotionalAmountVolume	2900000	Mcf
CY2015	us-gaap	Dividends Dividends	17222000	USD
CY2016	us-gaap	Dividends Dividends	18848000	USD
CY2017	us-gaap	Dividends Dividends	21045000	USD
CY2016Q4	us-gaap	Dividends Payable Current DividendsPayableCurrent	4973000	USD
CY2017Q4	us-gaap	Dividends Payable Current DividendsPayableCurrent	5312000	USD
CY2015	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.73
CY2016Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.33
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CY2016Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.29
CY2016Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.73
CY2016	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.87
CY2017Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.17
CY2017Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.37
CY2017Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.42
CY2017Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.60
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.56
CY2015	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.72
CY2016Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.33
CY2016Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.52
CY2016Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.29
CY2016Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.73
CY2016	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.86
CY2017Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.17
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CY2017Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.42
CY2017Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.59
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.55
CY2015	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.3954
CY2016	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.3881
CY2017	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.1975
CY2016	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2017	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2017	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2015	us-gaap	Employee Benefits And Share Based Compensation EmployeeBenefitsAndShareBasedCompensation	1235000	USD
CY2016	us-gaap	Employee Benefits And Share Based Compensation EmployeeBenefitsAndShareBasedCompensation	1887000	USD
CY2017	us-gaap	Employee Benefits And Share Based Compensation EmployeeBenefitsAndShareBasedCompensation	1577000	USD
CY2016Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	10496000	USD
CY2017Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	13112000	USD
CY2017Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Share Based Awards Other Than Options EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions	2278000	USD
CY2015	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	780000	USD
CY2016	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	952000	USD
CY2017	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	1003000	USD
CY2016Q4	us-gaap	Energy Marketing Contract Liabilities Current EnergyMarketingContractLiabilitiesCurrent	773000	USD
CY2017Q4	us-gaap	Energy Marketing Contract Liabilities Current EnergyMarketingContractLiabilitiesCurrent	6247000	USD
CY2016Q4	us-gaap	Energy Marketing Contracts Assets Current EnergyMarketingContractsAssetsCurrent	823000	USD
CY2017Q4	us-gaap	Energy Marketing Contracts Assets Current EnergyMarketingContractsAssetsCurrent	1286000	USD
CY2016Q4	us-gaap	Energy Related Inventory Natural Gas In Storage EnergyRelatedInventoryNaturalGasInStorage	5484000	USD
CY2017Q4	us-gaap	Energy Related Inventory Natural Gas In Storage EnergyRelatedInventoryNaturalGasInStorage	5250000	USD
CY2016Q4	us-gaap	Energy Related Inventory Propane Gas EnergyRelatedInventoryPropaneGas	6457000	USD
CY2017Q4	us-gaap	Energy Related Inventory Propane Gas EnergyRelatedInventoryPropaneGas	8324000	USD
CY2016	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings1 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1	8000	USD
CY2017	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings1 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1	61000	USD
CY2016	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases Sales Issuances Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements	123000	USD
CY2017	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases Sales Issuances Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements	79000	USD
CY2016	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Out Of Level3 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3	151000	USD
CY2017	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Out Of Level3 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3	-53000	USD
CY2015Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	279000	USD
CY2016Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	561000	USD
CY2017Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	648000	USD
CY2016Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	2709000	USD
CY2017Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	3247000	USD
CY2017Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	790000	USD
CY2017Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	471000	USD
CY2017Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	725000	USD
CY2016Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	4552000	USD
CY2017Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	7933000	USD
CY2016Q2	us-gaap	Gain Contingency Unrecorded Amount GainContingencyUnrecordedAmount	650000	USD
CY2015	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	340000	USD
CY2016	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	-695000	USD
CY2017	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	-3179000	USD
CY2016	us-gaap	Gain Loss On Fair Value Hedge Ineffectiveness Net GainLossOnFairValueHedgeIneffectivenessNet	448000	USD
CY2016	us-gaap	Gain Loss On Fair Value Hedges Recognized In Earnings GainLossOnFairValueHedgesRecognizedInEarnings	448000	USD
CY2016	us-gaap	Gain On Fair Value Hedge Ineffectiveness GainOnFairValueHedgeIneffectiveness	531000	USD
CY2016Q4	us-gaap	Goodwill Goodwill	15070000	USD
CY2017Q4	us-gaap	Goodwill Goodwill	22104000	USD
CY2016Q4	us-gaap	Ground Leases Accumulated Amortization GroundLeasesAccumulatedAmortization	3700000	USD
CY2017Q4	us-gaap	Ground Leases Accumulated Amortization GroundLeasesAccumulatedAmortization	5100000	USD
CY2017Q4	us-gaap	Guarantee Obligations Maximum Exposure GuaranteeObligationsMaximumExposure	72000000	USD
CY2015	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	68045000	USD
CY2016	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	73016000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	72433000	USD
CY2015	us-gaap	Income Tax Credits And Adjustments IncomeTaxCreditsAndAdjustments	-23000	USD
CY2016	us-gaap	Income Tax Credits And Adjustments IncomeTaxCreditsAndAdjustments	-71000	USD
CY2017	us-gaap	Income Tax Credits And Adjustments IncomeTaxCreditsAndAdjustments	-71000	USD
CY2015	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	26905000	USD
CY2016	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	28341000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	14309000	USD
CY2015	us-gaap	Income Tax Rate Reconciliation Deductions Employee Stock Ownership Plan Dividends IncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends	263000	USD
CY2016	us-gaap	Income Tax Rate Reconciliation Deductions Employee Stock Ownership Plan Dividends IncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends	264000	USD
CY2017	us-gaap	Income Tax Rate Reconciliation Deductions Employee Stock Ownership Plan Dividends IncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends	257000	USD
CY2015	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	0	USD
CY2016	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	0	USD
CY2017	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	-14299000	USD
CY2015	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	23865000	USD
CY2016	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	22759000	USD
CY2017	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	25351000	USD
CY2015	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	241000	USD
CY2016	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	2424000	USD
CY2017	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	1620000	USD
CY2015	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	3062000	USD
CY2016	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	3422000	USD
CY2017	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	1894000	USD
CY2015	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	11076000	USD
CY2016	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-5308000	USD
CY2017	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-4114000	USD
CY2016Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	22888000	USD
CY2017Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	14778000	USD
CY2015	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-11324000	USD
CY2016	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	19599000	USD
CY2017	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	15596000	USD
CY2015	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-17097000	USD
CY2016	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	27013000	USD
CY2017	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	19506000	USD
CY2015	us-gaap	Increase Decrease In Customer Deposits IncreaseDecreaseInCustomerDeposits	1976000	USD
CY2016	us-gaap	Increase Decrease In Customer Deposits IncreaseDecreaseInCustomerDeposits	2065000	USD
CY2017	us-gaap	Increase Decrease In Customer Deposits IncreaseDecreaseInCustomerDeposits	5513000	USD
CY2015	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	-331000	USD
CY2016	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	358000	USD
CY2017	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	2488000	USD
CY2015	us-gaap	Increase Decrease In Income Taxes Receivable IncreaseDecreaseInIncomeTaxesReceivable	4967000	USD
CY2016	us-gaap	Increase Decrease In Income Taxes Receivable IncreaseDecreaseInIncomeTaxesReceivable	-2466000	USD
CY2017	us-gaap	Increase Decrease In Income Taxes Receivable IncreaseDecreaseInIncomeTaxesReceivable	-8110000	USD
CY2015	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-1527000	USD
CY2016	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	2531000	USD
CY2017	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	9036000	USD
CY2015	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-3972000	USD
CY2016	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-1803000	USD
CY2017	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-2645000	USD
CY2015	us-gaap	Increase Decrease In Outstanding Checks Financing Activities IncreaseDecreaseInOutstandingChecksFinancingActivities	2450000	USD
CY2016	us-gaap	Increase Decrease In Outstanding Checks Financing Activities IncreaseDecreaseInOutstandingChecksFinancingActivities	3920000	USD
CY2017	us-gaap	Increase Decrease In Outstanding Checks Financing Activities IncreaseDecreaseInOutstandingChecksFinancingActivities	1738000	USD
CY2015	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	759000	USD
CY2016	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	1387000	USD
CY2017	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	7001000	USD
CY2015	us-gaap	Increase Decrease In Regulatory Assets And Liabilities IncreaseDecreaseInRegulatoryAssetsAndLiabilities	-3883000	USD
CY2016	us-gaap	Increase Decrease In Regulatory Assets And Liabilities IncreaseDecreaseInRegulatoryAssetsAndLiabilities	7523000	USD
CY2017	us-gaap	Increase Decrease In Regulatory Assets And Liabilities IncreaseDecreaseInRegulatoryAssetsAndLiabilities	2855000	USD
CY2015	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	48950	shares
CY2016	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	42552	shares
CY2017	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	46563	shares
CY2016Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	1843000	USD
CY2017Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	4686000	USD
CY2017	us-gaap	Intercompany Agreements Description IntercompanyAgreementsDescription	3
CY2015	us-gaap	Interest Expense InterestExpense	10006000	USD
CY2016	us-gaap	Interest Expense InterestExpense	10639000	USD
CY2017	us-gaap	Interest Expense InterestExpense	12645000	USD
CY2015	us-gaap	Interest Paid InterestPaid	9500000	USD
CY2016	us-gaap	Interest Paid InterestPaid	10320000	USD
CY2017	us-gaap	Interest Paid InterestPaid	12420000	USD
CY2016Q4	us-gaap	Interest Payable Current InterestPayableCurrent	1312000	USD
CY2017Q4	us-gaap	Interest Payable Current InterestPayableCurrent	1742000	USD
CY2016Q4	us-gaap	Investments Fair Value Disclosure InvestmentsFairValueDisclosure	4902000	USD
CY2017Q4	us-gaap	Investments Fair Value Disclosure InvestmentsFairValueDisclosure	6756000	USD
CY2016Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1229219000	USD
CY2017Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1417434000	USD
CY2016Q4	us-gaap	Liabilities Current LiabilitiesCurrent	334051000	USD
CY2017Q4	us-gaap	Liabilities Current LiabilitiesCurrent	413000000	USD
CY2015	us-gaap	Line Of Credit Facility Commitment Fee Amount LineOfCreditFacilityCommitmentFeeAmount	106000	USD
CY2016	us-gaap	Line Of Credit Facility Commitment Fee Amount LineOfCreditFacilityCommitmentFeeAmount	145000	USD
CY2017	us-gaap	Line Of Credit Facility Commitment Fee Amount LineOfCreditFacilityCommitmentFeeAmount	131000	USD
CY2017Q4	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	370000000	USD
CY2017Q4	us-gaap	Line Of Credit Facility Remaining Borrowing Capacity LineOfCreditFacilityRemainingBorrowingCapacity	129329000	USD
CY2016Q4	us-gaap	Lines Of Credit Current LinesOfCreditCurrent	201311000	USD
CY2017Q4	us-gaap	Lines Of Credit Current LinesOfCreditCurrent	240671000	USD
CY2016Q4	us-gaap	Long Term Debt LongTermDebt	145900000	USD
CY2017Q4	us-gaap	Long Term Debt LongTermDebt	205200000	USD
CY2016Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	149053000	USD
CY2017Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	206816000	USD
CY2016Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	12099000	USD
CY2017Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	9421000	USD
CY2016Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	12099000	USD
CY2017Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	9421000	USD
CY2016Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	161500000	USD
CY2017Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	215400000	USD
CY2017Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	132300000	USD
CY2017Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	8000000	USD
CY2017Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	25100000	USD
CY2017Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	13600000	USD
CY2017Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	15600000	USD
CY2017Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	10600000	USD
CY2016Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	136954000	USD
CY2017Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	197395000	USD
CY2016	us-gaap	Loss On Fair Value Hedge Ineffectiveness LossOnFairValueHedgeIneffectiveness	83000	USD
CY2015	us-gaap	Maintenance Costs MaintenanceCosts	11803000	USD
CY2016	us-gaap	Maintenance Costs MaintenanceCosts	12391000	USD
CY2017	us-gaap	Maintenance Costs MaintenanceCosts	12701000	USD
CY2015	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	58105000	USD
CY2016	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	67219000	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	78242000	USD
CY2015	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-164539000	USD
CY2016	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-170037000	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-186895000	USD
CY2015	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	104715000	USD
CY2016	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	104141000	USD
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	110089000	USD
CY2015	us-gaap	Net Income Loss NetIncomeLoss	41140000	USD
CY2016Q1	us-gaap	Net Income Loss NetIncomeLoss	20367000	USD
CY2016Q2	us-gaap	Net Income Loss NetIncomeLoss	8029000	USD
CY2016Q3	us-gaap	Net Income Loss NetIncomeLoss	4416000	USD
CY2016Q4	us-gaap	Net Income Loss NetIncomeLoss	11863000	USD
CY2016	us-gaap	Net Income Loss NetIncomeLoss	44675000	USD
CY2017Q1	us-gaap	Net Income Loss NetIncomeLoss	19144000	USD
CY2017Q2	us-gaap	Net Income Loss NetIncomeLoss	6046000	USD
CY2017Q3	us-gaap	Net Income Loss NetIncomeLoss	6833000	USD
CY2017Q4	us-gaap	Net Income Loss NetIncomeLoss	26101000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	58124000	USD
CY2015	us-gaap	Operating Expenses OperatingExpenses	381486000	USD
CY2016	us-gaap	Operating Expenses OperatingExpenses	414764000	USD
CY2017	us-gaap	Operating Expenses OperatingExpenses	531740000	USD
CY2015	us-gaap	Operating Income Loss OperatingIncomeLoss	77758000	USD
CY2016Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	36380000	USD
CY2016Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	15742000	USD
CY2016Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	10156000	USD
CY2016Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	21819000	USD
CY2016	us-gaap	Operating Income Loss OperatingIncomeLoss	84096000	USD
CY2017Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	34676000	USD
CY2017Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	13666000	USD
CY2017Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	14239000	USD
CY2017Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	23263000	USD
CY2017	us-gaap	Operating Income Loss OperatingIncomeLoss	85843000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	10600000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	2700000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	654000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	815000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	1000000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	1700000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	3700000	USD
CY2017	us-gaap	Operating Leases Income Statement Lease Revenue OperatingLeasesIncomeStatementLeaseRevenue	264000	USD
CY2015	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	1700000	USD
CY2016	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	2500000	USD
CY2017	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	3600000	USD
CY2016Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	7063000	USD
CY2017Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	10273000	USD
CY2016Q4	us-gaap	Other Assets Current OtherAssetsCurrent	2470000	USD
CY2017Q4	us-gaap	Other Assets Current OtherAssetsCurrent	7260000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Net Of Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax	-40000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Net Of Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax	-48000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Net Of Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax	-46000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	-27000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	-29000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	-31000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	508000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	440000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	962000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	606000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-164000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	962000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	606000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	22021000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	-103000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	-268000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	-663000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax	-73000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax	-178000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax	-432000	USD
CY2015	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-227000	USD
CY2016	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	742000	USD
CY2017	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-11000	USD
CY2015	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	-150000	USD
CY2016	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	496000	USD
CY2017	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	-8000	USD
CY2016Q4	us-gaap	Other Inventory OtherInventory	4576000	USD
CY2017Q4	us-gaap	Other Inventory OtherInventory	12022000	USD
CY2016Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	4750000	USD
CY2017Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	5955000	USD
CY2015	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-47000	USD
CY2016	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	79000	USD
CY2017	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	750000	USD
CY2015	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	293000	USD
CY2016	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-441000	USD
CY2017	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-765000	USD
CY2017	us-gaap	Other Restrictions On Payment Of Dividends OtherRestrictionsOnPaymentOfDividends	10.0
CY2015	us-gaap	Other Sales Revenue Net OtherSalesRevenueNet	-4766000	USD
CY2016	us-gaap	Other Sales Revenue Net OtherSalesRevenueNet	-10607000	USD
CY2017	us-gaap	Other Sales Revenue Net OtherSalesRevenueNet	-33322000	USD
CY2015	us-gaap	Payments For Environmental Liabilities PaymentsForEnvironmentalLiabilities	174000	USD
CY2016	us-gaap	Payments For Environmental Liabilities PaymentsForEnvironmentalLiabilities	350000	USD
CY2017	us-gaap	Payments For Environmental Liabilities PaymentsForEnvironmentalLiabilities	329000	USD
CY2015	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	15924000	USD
CY2016	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	17482000	USD
CY2017	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	19928000	USD
CY2015	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	592000	USD
CY2016	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	770000	USD
CY2017	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	692000	USD
CY2015	us-gaap	Payments To Acquire Businesses Gross PaymentsToAcquireBusinessesGross	20930000	USD
CY2016	us-gaap	Payments To Acquire Businesses Gross PaymentsToAcquireBusinessesGross	0	USD
CY2017	us-gaap	Payments To Acquire Businesses Gross PaymentsToAcquireBusinessesGross	11945000	USD
CY2015	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	143599000	USD
CY2016	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	169861000	USD
CY2017	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	175329000	USD
CY2016Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	32828000	USD
CY2017Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	29699000	USD
CY2016Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2017Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2016Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	2000000	shares
CY2017Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	2000000	shares
CY2017Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	2000000	shares
CY2016Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2017Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2016Q4	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	6792000	USD
CY2017Q4	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	13621000	USD
CY2015	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	USD
CY2016	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	57360000	USD
CY2017	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	-10000	USD
CY2015	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	0	USD
CY2016	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	0	USD
CY2017	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	69807000	USD
CY2015	us-gaap	Proceeds From Repayments Of Lines Of Credit ProceedsFromRepaymentsOfLinesOfCredit	82178000	USD
CY2016	us-gaap	Proceeds From Repayments Of Lines Of Credit ProceedsFromRepaymentsOfLinesOfCredit	32526000	USD
CY2017	us-gaap	Proceeds From Repayments Of Lines Of Credit ProceedsFromRepaymentsOfLinesOfCredit	39338000	USD
CY2015	us-gaap	Proceeds From Repurchase Of Equity ProceedsFromRepurchaseOfEquity	813000	USD
CY2016	us-gaap	Proceeds From Repurchase Of Equity ProceedsFromRepurchaseOfEquity	811000	USD
CY2017	us-gaap	Proceeds From Repurchase Of Equity ProceedsFromRepurchaseOfEquity	89000	USD
CY2015	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	164000	USD
CY2016	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	174000	USD
CY2017	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	708000	USD
CY2016Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	1175595000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	1312117000	USD
CY2016Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	986664000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1126027000	USD
CY2016Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	21114000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	27699000	USD
CY2016Q4	us-gaap	Property Subject To Or Available For Operating Lease Accumulated Depreciation PropertySubjectToOrAvailableForOperatingLeaseAccumulatedDepreciation	580000	USD
CY2017Q4	us-gaap	Property Subject To Or Available For Operating Lease Accumulated Depreciation PropertySubjectToOrAvailableForOperatingLeaseAccumulatedDepreciation	652000	USD
CY2017Q4	us-gaap	Property Subject To Or Available For Operating Lease Gross PropertySubjectToOrAvailableForOperatingLeaseGross	1400000	USD
CY2016Q4	us-gaap	Public Utilities Property Plant And Equipment Plant In Service PublicUtilitiesPropertyPlantAndEquipmentPlantInService	957681000	USD
CY2017Q4	us-gaap	Public Utilities Property Plant And Equipment Plant In Service PublicUtilitiesPropertyPlantAndEquipmentPlantInService	1073736000	USD
CY2017Q4	us-gaap	Purchase Obligation Due After Fifth Year PurchaseObligationDueAfterFifthYear	149600000	USD
CY2017Q4	us-gaap	Purchase Obligation Due In Fourth And Fifth Year PurchaseObligationDueInFourthAndFifthYear	44600000	USD
CY2017Q4	us-gaap	Purchase Obligation Due In Next Twelve Months PurchaseObligationDueInNextTwelveMonths	152900000	USD
CY2017Q4	us-gaap	Purchase Obligation Due In Second And Third Year PurchaseObligationDueInSecondAndThirdYear	122800000	USD
CY2017Q4	us-gaap	Ratio Of Indebtedness To Net Capital1 RatioOfIndebtednessToNetCapital1	0.65
CY2016	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-454000	USD
CY2017	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-166000	USD
CY2015	us-gaap	Regulated Operating Revenue RegulatedOperatingRevenue	301902000	USD
CY2016	us-gaap	Regulated Operating Revenue RegulatedOperatingRevenue	305689000	USD
CY2017	us-gaap	Regulated Operating Revenue RegulatedOperatingRevenue	326310000	USD
CY2016Q4	us-gaap	Regulatory Assets RegulatoryAssets	84497000	USD
CY2017Q4	us-gaap	Regulatory Assets RegulatoryAssets	86505000	USD
CY2016Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	7694000	USD
CY2017Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	10930000	USD
CY2016Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	76803000	USD
CY2017Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	75575000	USD
CY2016Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	44355000	USD
CY2017Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	147463000	USD
CY2016Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	1291000	USD
CY2017Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	6485000	USD
CY2016Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	43064000	USD
CY2017Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	140978000	USD
CY2015	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	10820000	USD
CY2016	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	9146000	USD
CY2017	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	12100000	USD
CY2017Q4	us-gaap	Restricted Investments Percent Of Net Assets RestrictedInvestmentsPercentOfNetAssets	0.09
CY2016Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	192062000	USD
CY2017Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	229141000	USD
CY2015	us-gaap	Revenues Revenues	459244000	USD
CY2016Q1	us-gaap	Revenues Revenues	146296000	USD
CY2016Q2	us-gaap	Revenues Revenues	102342000	USD
CY2016Q3	us-gaap	Revenues Revenues	108348000	USD
CY2016Q4	us-gaap	Revenues Revenues	141874000	USD
CY2016	us-gaap	Revenues Revenues	498860000	USD
CY2017Q1	us-gaap	Revenues Revenues	185160000	USD
CY2017Q2	us-gaap	Revenues Revenues	125084000	USD
CY2017Q3	us-gaap	Revenues Revenues	126936000	USD
CY2017Q4	us-gaap	Revenues Revenues	180403000	USD
CY2017	us-gaap	Revenues Revenues	617583000	USD
CY2015	us-gaap	Share Based Compensation ShareBasedCompensation	1937000	USD
CY2016	us-gaap	Share Based Compensation ShareBasedCompensation	2367000	USD
CY2017	us-gaap	Share Based Compensation ShareBasedCompensation	2490000	USD
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	835	shares
CY2016Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	209871000	USD
CY2017Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	250969000	USD
CY2016Q4	us-gaap	Short Term Debt Weighted Average Interest Rate ShortTermDebtWeightedAverageInterestRate	0.014269
CY2017Q4	us-gaap	Short Term Debt Weighted Average Interest Rate ShortTermDebtWeightedAverageInterestRate	0.024246
CY2016	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	960488	shares
CY2015	us-gaap	Stock Issued During Period Value Acquisitions StockIssuedDuringPeriodValueAcquisitions	30165000	USD
CY2017	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	735000	USD
CY2016	us-gaap	Stock Issued During Period Value Other StockIssuedDuringPeriodValueOther	62.26	USD
CY2015	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	1662000	USD
CY2016	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	1557000	USD
CY2017	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	1798000	USD
CY2014Q4	us-gaap	Stockholders Equity StockholdersEquity	300322000	USD
CY2015Q4	us-gaap	Stockholders Equity StockholdersEquity	358138000	USD
CY2016Q4	us-gaap	Stockholders Equity StockholdersEquity	446086000	USD
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	486294000	USD
CY2015	us-gaap	Taxes Other TaxesOther	13607000	USD
CY2016	us-gaap	Taxes Other TaxesOther	14730000	USD
CY2017	us-gaap	Taxes Other TaxesOther	17085000	USD
CY2015	us-gaap	Trading Securities Unrealized Holding Gain Loss TradingSecuritiesUnrealizedHoldingGainLoss	7000	USD
CY2016	us-gaap	Trading Securities Unrealized Holding Gain Loss TradingSecuritiesUnrealizedHoldingGainLoss	379000	USD
CY2017	us-gaap	Trading Securities Unrealized Holding Gain Loss TradingSecuritiesUnrealizedHoldingGainLoss	1000000	USD
CY2016Q4	us-gaap	Treasury Stock Value TreasuryStockValue	2416000	USD
CY2017Q4	us-gaap	Treasury Stock Value TreasuryStockValue	3395000	USD
CY2016Q4	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	291000	USD
CY2017Q4	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	433000	USD
CY2015	us-gaap	Unrealized Gain Loss On Commodity Contracts UnrealizedGainLossOnCommodityContracts	-96000	USD
CY2016	us-gaap	Unrealized Gain Loss On Commodity Contracts UnrealizedGainLossOnCommodityContracts	385000	USD
CY2017	us-gaap	Unrealized Gain Loss On Commodity Contracts UnrealizedGainLossOnCommodityContracts	1001000	USD
CY2015	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	474000	USD
CY2016	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	-45000	USD
CY2017	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	-3195000	USD
CY2015	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	162108000	USD
CY2016	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	203778000	USD
CY2017	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	324595000	USD
CY2014Q4	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	1120000	USD
CY2015Q4	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	909000	USD
CY2016Q4	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	909000	USD
CY2017Q4	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	936000	USD
CY2015	us-gaap	Valuation Allowances And Reserves Charged To Cost And Expense ValuationAllowancesAndReservesChargedToCostAndExpense	979000	USD
CY2016	us-gaap	Valuation Allowances And Reserves Charged To Cost And Expense ValuationAllowancesAndReservesChargedToCostAndExpense	985000	USD
CY2017	us-gaap	Valuation Allowances And Reserves Charged To Cost And Expense ValuationAllowancesAndReservesChargedToCostAndExpense	602000	USD
CY2015	us-gaap	Valuation Allowances And Reserves Charged To Other Accounts ValuationAllowancesAndReservesChargedToOtherAccounts	246000	USD
CY2016	us-gaap	Valuation Allowances And Reserves Charged To Other Accounts ValuationAllowancesAndReservesChargedToOtherAccounts	340000	USD
CY2017	us-gaap	Valuation Allowances And Reserves Charged To Other Accounts ValuationAllowancesAndReservesChargedToOtherAccounts	337000	USD
CY2015	us-gaap	Valuation Allowances And Reserves Deductions ValuationAllowancesAndReservesDeductions	1436000	USD
CY2016	us-gaap	Valuation Allowances And Reserves Deductions ValuationAllowancesAndReservesDeductions	1325000	USD
CY2017	us-gaap	Valuation Allowances And Reserves Deductions ValuationAllowancesAndReservesDeductions	912000	USD
CY2015	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	15143373	shares
CY2016	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	15613091	shares
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	16383352	shares
CY2015	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	15094423	shares
CY2016	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	15570539	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16336789	shares
CY2017	us-gaap	Use Of Estimates UseOfEstimates	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-top:18px;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">Use of Estimates</font></div><div style="line-height:120%;padding-top:6px;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The preparation of the consolidated financial statements in conformity with GAAP requires management to make estimates in measuring assets and liabilities and related revenues and expenses. These estimates involve judgments with respect to, among other things, various future economic factors that are difficult to predict and are beyond our control; therefore, actual results could differ from these estimates</font></div></div>

Files In Submission

Name	View Source	Status
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2016 Q4 Form 10-K Financial Statement

#000162828018002594 Filed on March 01, 2018

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CPK CHESAPEAKE UTILITIES CORP Stock $cpk

2016 Q4 Form 10-K Financial Statement

#000162828018002594 Filed on March 01, 2018

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CPK
CHESAPEAKE UTILITIES CORP Stock $cpk