$CPK
CHESAPEAKE UTILITIES CORP Stock $cpk

$cpk Overview Financials Valuation SEC Filings Company Website

2021 Q4 Form 10-K Financial Statement

#000162828022003530 Filed on February 23, 2022

Income Statement

Concept	2021 Q4	2021 Q3	2021
Revenue	$160.4M	$107.3M	$570.0M
YoY Change	17.02%	5.83%	16.75%
Cost Of Revenue	$58.59M	$27.37M	$187.0M
YoY Change	45.74%	24.96%	35.57%
Gross Profit	$101.8M	$79.97M	$383.0M
YoY Change	5.14%	0.59%	9.34%
Gross Profit Margin	63.47%	74.5%	67.2%
Selling, General & Admin		$515.0K
YoY Change
% of Gross Profit		0.64%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$16.20M	$15.80M	$62.66M
YoY Change	5.89%	-13.67%	7.82%
% of Gross Profit	15.92%	19.76%	16.36%
Operating Expenses	$64.95M	$87.22M	$438.9M
YoY Change	5.44%	3.82%	16.88%
Operating Profit	$36.82M	$20.11M	$131.1M
YoY Change	4.6%	15.55%	16.31%
Interest Expense	-$5.001M	$4.975M	$20.14M
YoY Change	-20.62%	8.53%	-7.49%
% of Operating Profit	-13.58%	24.74%	15.36%
Other Income/Expense, Net	-$459.0K	$339.0K	$1.721M
YoY Change	-329.5%	-947.5%	-46.59%
Pretax Income	$31.36M	$15.48M	$112.7M
YoY Change	7.78%	21.08%	19.66%
Income Tax	$8.668M	$2.993M	$29.23M
% Of Pretax Income	27.64%	19.34%	25.94%
Net Earnings	$22.35M	$9.261M	$83.47M
YoY Change	-0.94%	64.76%	16.74%
Net Earnings / Revenue	13.94%	8.63%	14.64%
Basic Earnings Per Share	$1.27	$0.56	$4.75
Diluted Earnings Per Share	$1.26	$0.56	$4.73
COMMON SHARES
Basic Shares Outstanding		17.58M shares	17.56M shares
Diluted Shares Outstanding		17.66M shares	17.63M shares

Balance Sheet

Concept	2021 Q4	2021 Q3	2021
SHORT-TERM ASSETS
Cash & Short-Term Investments	$4.976M	$5.886M	$4.976M
YoY Change	42.17%	89.87%	42.17%
Cash & Equivalents	$4.976M	$5.886M	$4.976M
Short-Term Investments
Other Short-Term Assets	$1.033M	$440.0K	$45.02M
YoY Change	136.93%	-41.57%	62.54%
Inventory	$24.68M	$18.30M	$24.68M
Prepaid Expenses	$17.12M	$15.56M
Receivables	$58.48M	$44.59M	$81.00M
Other Receivables	$17.46M	$12.70M	$17.46M
Total Short-Term Assets	$173.1M	$133.0M	$173.1M
YoY Change	26.9%	11.46%	26.93%
LONG-TERM ASSETS
Property, Plant & Equipment	$1.745B	$1.700B	$1.755B
YoY Change	8.97%	8.45%	8.85%
Goodwill	$44.71M	$38.80M
YoY Change	15.43%	5.07%
Intangibles	$13.19M	$7.298M
YoY Change	59.09%	1.15%
Long-Term Investments	$12.10M	$11.49M	$12.10M
YoY Change	11.99%	18.45%	11.99%
Other Assets	$104.2M	$107.9M	$104.2M
YoY Change	-8.46%	-4.28%	-8.46%
Total Long-Term Assets	$1.942B	$1.889B	$1.942B
YoY Change	8.11%	6.79%	8.11%
TOTAL ASSETS
Total Short-Term Assets	$173.1M	$133.0M	$173.1M
Total Long-Term Assets	$1.942B	$1.889B	$1.942B
Total Assets	$2.115B	$2.022B	$2.115B
YoY Change	9.44%	7.08%	9.44%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$52.63M	$53.03M	$52.63M
YoY Change	-12.65%	14.05%	-12.72%
Accrued Expenses	$36.20M	$41.73M	$35.45M
YoY Change	12.77%	20.27%	10.45%
Deferred Revenue	$747.0K	$874.0K
YoY Change	15.99%	-9.99%
Short-Term Debt	$221.6M	$192.0M	$221.6M
YoY Change	26.2%	-11.28%	26.22%
Long-Term Debt Due	$17.96M	$16.21M	$17.96M
YoY Change	32.07%	3.88%	32.07%
Total Short-Term Liabilities	$376.4M	$354.5M	$376.4M
YoY Change	14.41%	-1.51%	14.42%
LONG-TERM LIABILITIES
Long-Term Debt	$549.9M	$505.5M	$549.9M
YoY Change	8.14%	-2.79%	8.14%
Other Long-Term Liabilities	$2.136M	$2.051M	$180.9M
YoY Change	-56.43%	-58.45%	-6.05%
Total Long-Term Liabilities	$552.0M	$507.5M	$730.8M
YoY Change	7.53%	-3.31%	4.24%
TOTAL LIABILITIES
Total Short-Term Liabilities	$376.4M	$354.5M	$376.4M
Total Long-Term Liabilities	$552.0M	$507.5M	$730.8M
Total Liabilities	$928.5M	$862.1M	$1.341B
YoY Change	10.21%	-2.58%	8.53%
SHAREHOLDERS EQUITY
Retained Earnings	$393.1M	$378.9M
YoY Change	14.61%	15.39%
Common Stock	$379.8M	$369.6M
YoY Change	6.38%	26.6%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$7.240M	$7.186M
YoY Change	27.49%	27.55%
Treasury Stock Shares
Shareholders Equity	$774.1M	$751.0M	$774.1M
YoY Change
Total Liabilities & Shareholders Equity	$2.115B	$2.022B	$2.115B
YoY Change	9.44%	7.08%	9.44%

Cashflow Statement

Concept	2021 Q4	2021 Q3	2021
OPERATING ACTIVITIES
Net Income	$22.35M	$9.261M	$83.47M
YoY Change	-0.94%	64.76%	16.74%
Depreciation, Depletion And Amortization	$16.20M	$15.80M	$62.66M
YoY Change	5.89%	-13.67%	7.82%
Cash From Operating Activities	-$2.280M	$18.57M	$150.5M
YoY Change	-105.3%	-23.27%	-5.29%
INVESTING ACTIVITIES
Capital Expenditures	-$38.71M	-$43.58M	$186.9M
YoY Change	-8.05%	7.34%	12.94%
Acquisitions
YoY Change
Other Investing Activities	-$36.24M	$35.00K	-$36.10M
YoY Change	1107.87%	-100.22%	124.22%
Cash From Investing Activities	-$74.95M	-$43.55M	-$223.0M
YoY Change	66.55%	-22.65%	22.79%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net			-$15.85M
YoY Change			-81.04%
Debt Paid & Issued, Net			$13.81M
YoY Change			-74.23%
Cash From Financing Activities	76.32M	25.85M	$74.00M
YoY Change	2952.68%	-17.92%	284.81%
NET CHANGE
Cash From Operating Activities	-2.280M	18.57M	$150.5M
Cash From Investing Activities	-74.95M	-43.55M	-$223.0M
Cash From Financing Activities	76.32M	25.85M	$74.00M
Net Change In Cash	-910.0K	875.0K	$1.477M
YoY Change	-282.0%	-245.83%	-142.37%
FREE CASH FLOW
Cash From Operating Activities	-$2.280M	$18.57M	$150.5M
Capital Expenditures	-$38.71M	-$43.58M	$186.9M
Free Cash Flow	$36.43M	$62.15M	-$36.42M
YoY Change	-57.19%	-4.09%	452.24%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2021	dei	Entity Registrant Name EntityRegistrantName	CHESAPEAKE UTILITIES CORP
CY2021	dei	Trading Symbol TradingSymbol	CPK
CY2021	dei	Entity Central Index Key EntityCentralIndexKey	0000019745
CY2021	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2021	dei	Document Type DocumentType	10-K
CY2021	dei	Document Period End Date DocumentPeriodEndDate	2021-12-31
CY2021	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2021
CY2021	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2021	dei	Amendment Flag AmendmentFlag	false
CY2021	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2021	dei	Security Exchange Name SecurityExchangeName	NYSE
CY2021	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	-20000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	-18000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	-20148	USD
CY2021	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax	-662000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax	41000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax	-368387	USD
CY2021	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	864000	USD
CY2020	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	1392000	USD
CY2019	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	-176000	USD
CY2021	cpk	Other Comprehensive Income Loss Unrealized Gain Loss On Interest Rate Swaps During Period Tax OtherComprehensiveIncomeLossUnrealizedGainLossOnInterestRateSwapsDuringPeriodTax	12000	USD
CY2020	cpk	Other Comprehensive Income Loss Unrealized Gain Loss On Interest Rate Swaps During Period Tax OtherComprehensiveIncomeLossUnrealizedGainLossOnInterestRateSwapsDuringPeriodTax	-12000	USD
CY2021Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.4867
CY2020Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.4867
CY2021Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	50000000	shares
CY2020Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	50000000	shares
CY2021Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	2000000	shares
CY2020Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	2000000	shares
CY2021Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2020Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2021	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.8800
CY2020	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.7250
CY2019	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.5850
CY2021	cpk	Numberof Monthsto Establish Rou Assetand Liability NumberofMonthstoEstablishROUAssetandLiability	P12M
CY2021	cpk	Lengthoftimeuntildeferredamountsrecoveredorrefunded Lengthoftimeuntildeferredamountsrecoveredorrefunded	1
CY2019	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2021	cpk	Number Of Unsecured Bank Credit Facilities NumberOfUnsecuredBankCreditFacilities	3
CY2021	us-gaap	Deferred Compensation Arrangement With Individual Requisite Service Period1 DeferredCompensationArrangementWithIndividualRequisiteServicePeriod1	P2Y
CY2021	us-gaap	Deferred Compensation Arrangement With Individual Requisite Service Period1 DeferredCompensationArrangementWithIndividualRequisiteServicePeriod1	P2Y
CY2021	cpk	Companys Exposure In Number Of Former Manufactured Gas Plant Sites CompanysExposureInNumberOfFormerManufacturedGasPlantSites	7	site
CY2021	us-gaap	Intercompany Agreements Description IntercompanyAgreementsDescription	three years
CY2021	cpk	Maximum Days To Make Default Good MaximumDaysToMakeDefaultGood	P5D
CY2021Q1	us-gaap	Net Income Loss NetIncomeLoss	28930000	USD
CY2021Q2	us-gaap	Net Income Loss NetIncomeLoss	10956000	USD
CY2021Q3	us-gaap	Net Income Loss NetIncomeLoss	9261000	USD
CY2021Q4	us-gaap	Net Income Loss NetIncomeLoss	22352000	USD
CY2021Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.76
CY2021Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.67
CY2021Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.56
CY2021Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.27
CY2021Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.76
CY2021Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.66
CY2021Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.56
CY2021Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.26
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	28663000	USD
CY2020Q2	us-gaap	Net Income Loss NetIncomeLoss	8304000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	5621000	USD
CY2020Q4	us-gaap	Net Income Loss NetIncomeLoss	22564000	USD
CY2020Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.75
CY2020Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.51
CY2020Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.34
CY2020Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.38
CY2020Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.74
CY2020Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.50
CY2020Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.34
CY2020Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.37
CY2021	dei	Document Annual Report DocumentAnnualReport	true
CY2021	dei	Document Transition Report DocumentTransitionReport	false
CY2021	dei	Entity File Number EntityFileNumber	001-11590
CY2021	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	51-0064146
CY2021	dei	Entity Address Address Line1 EntityAddressAddressLine1	909 Silver Lake Boulevard
CY2021	dei	Entity Address City Or Town EntityAddressCityOrTown	Dover
CY2021	dei	Entity Address State Or Province EntityAddressStateOrProvince	DE
CY2021	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	19904
CY2021	dei	City Area Code CityAreaCode	302
CY2021	dei	Local Phone Number LocalPhoneNumber	734-6799
CY2021	dei	Security12b Title Security12bTitle	Common Stock—par value per share $0.4867
CY2021	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2021	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2021	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2021	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2021	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2021	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2021	dei	Entity Small Business EntitySmallBusiness	false
CY2021	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2021	dei	Entity Shell Company EntityShellCompany	false
CY2021	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2021Q2	dei	Entity Public Float EntityPublicFloat	2100000000	USD
CY2022Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	17657537	shares
CY2021	dei	Auditor Name AuditorName	Baker Tilly US, LLP
CY2021	dei	Auditor Location AuditorLocation	Philadelphia, Pennsylvania
CY2021	us-gaap	Regulated Operating Revenue RegulatedOperatingRevenue	383920000	USD
CY2020	us-gaap	Regulated Operating Revenue RegulatedOperatingRevenue	352746000	USD
CY2019	us-gaap	Regulated Operating Revenue RegulatedOperatingRevenue	343006000	USD
CY2021	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	206869000	USD
CY2020	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	152526000	USD
CY2019	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	154151000	USD
CY2021	cpk	Other Operating Revenue OtherOperatingRevenue	-20821000	USD
CY2020	cpk	Other Operating Revenue OtherOperatingRevenue	-17074000	USD
CY2019	cpk	Other Operating Revenue OtherOperatingRevenue	-17552000	USD
CY2021	us-gaap	Revenues Revenues	569968000	USD
CY2020	us-gaap	Revenues Revenues	488198000	USD
CY2019	us-gaap	Revenues Revenues	479605000	USD
CY2021	cpk	Regulated Energy Cost Of Sales RegulatedEnergyCostOfSales	100737000	USD
CY2020	cpk	Regulated Energy Cost Of Sales RegulatedEnergyCostOfSales	91994000	USD
CY2019	cpk	Regulated Energy Cost Of Sales RegulatedEnergyCostOfSales	102803000	USD
CY2021	cpk	Unregulated Energy And Other Cost Of Sales UnregulatedEnergyAndOtherCostOfSales	86213000	USD
CY2020	cpk	Unregulated Energy And Other Cost Of Sales UnregulatedEnergyAndOtherCostOfSales	45944000	USD
CY2019	cpk	Unregulated Energy And Other Cost Of Sales UnregulatedEnergyAndOtherCostOfSales	51698000	USD
CY2021	cpk	Operations Operations	148294000	USD
CY2020	cpk	Operations Operations	142055000	USD
CY2019	cpk	Operations Operations	137845000	USD
CY2021	us-gaap	Operating Costs And Expenses OperatingCostsAndExpenses	16793000	USD
CY2020	us-gaap	Operating Costs And Expenses OperatingCostsAndExpenses	15587000	USD
CY2019	us-gaap	Operating Costs And Expenses OperatingCostsAndExpenses	15679000	USD
CY2021	cpk	Settlement Gain SettlementGain	0	USD
CY2020	cpk	Settlement Gain SettlementGain	130000	USD
CY2019	cpk	Settlement Gain SettlementGain	130000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	106285000	USD
CY2019	us-gaap	Taxes Other TaxesOther	20001000	USD
CY2021	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	62661000	USD
CY2020	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	58117000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	45424000	USD
CY2021	us-gaap	Taxes Other TaxesOther	24158000	USD
CY2020	us-gaap	Taxes Other TaxesOther	21908000	USD
CY2021	us-gaap	Operating Expenses OperatingExpenses	438856000	USD
CY2020	us-gaap	Operating Expenses OperatingExpenses	375475000	USD
CY2019	us-gaap	Operating Expenses OperatingExpenses	373320000	USD
CY2021	us-gaap	Operating Income Loss OperatingIncomeLoss	131112000	USD
CY2020	us-gaap	Operating Income Loss OperatingIncomeLoss	112723000	USD
CY2021	us-gaap	Interest Expense InterestExpense	20135000	USD
CY2021	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	1721000	USD
CY2020	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	3222000	USD
CY2019	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-1847000	USD
CY2020	us-gaap	Interest Expense InterestExpense	21765000	USD
CY2019	us-gaap	Interest Expense InterestExpense	22224000	USD
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	112698000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	94180000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	82214000	USD
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	29231000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	23538000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	21114000	USD
CY2021	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	83467000	USD
CY2020	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	70642000	USD
CY2019	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	61100000	USD
CY2021	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	-1000	USD
CY2020	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	686000	USD
CY2019	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	-1349000	USD
CY2021	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	0	USD
CY2020	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	170000	USD
CY2019	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	5402000	USD
CY2021	us-gaap	Net Income Loss NetIncomeLoss	83466000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	71498000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	65153000	USD
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	17558078	shares
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16711579	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16398443	shares
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	17633029	shares
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	16770735	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	16448486	shares
CY2021	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	4.75
CY2020	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	4.23
CY2019	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	3.73
CY2021	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Basic Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare	0
CY2020	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Basic Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare	0.05
CY2019	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Basic Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare	0.24
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.75
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.28
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.97
CY2021	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	4.73
CY2020	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	4.21
CY2019	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	3.72
CY2021	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Diluted Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare	0
CY2020	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Diluted Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare	0.05
CY2019	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax Per Diluted Share DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerDilutedShare	0.24
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.73
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.26
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.96
CY2021	us-gaap	Net Income Loss NetIncomeLoss	83466000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	71498000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	65153000	USD
CY2021	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	-57000	USD
CY2020	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	-59000	USD
CY2019	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	-57000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	-1935000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	154000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	-1052000	USD
CY2021	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	2262000	USD
CY2020	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	3643000	USD
CY2019	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-434000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	28000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	-28000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	4168000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	3402000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	561000	USD
CY2021	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	87634000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	74900000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	65714000	USD
CY2021Q4	us-gaap	Public Utilities Property Plant And Equipment Plant In Service PublicUtilitiesPropertyPlantAndEquipmentPlantInService	1720287000	USD
CY2020Q4	us-gaap	Public Utilities Property Plant And Equipment Plant In Service PublicUtilitiesPropertyPlantAndEquipmentPlantInService	1577576000	USD
CY2021Q4	cpk	Unregulated Energy Property Plant And Equipment UnregulatedEnergyPropertyPlantAndEquipment	357259000	USD
CY2020Q4	cpk	Unregulated Energy Property Plant And Equipment UnregulatedEnergyPropertyPlantAndEquipment	300647000	USD
CY2021Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	35418000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	30769000	USD
CY2021Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	2112964000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	1908992000	USD
CY2021Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	417479000	USD
CY2021Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	4976000	USD
CY2020Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	368743000	USD
CY2021Q4	cpk	Construction Work In Progress ConstructionWorkInProgress	49393000	USD
CY2020Q4	cpk	Construction Work In Progress ConstructionWorkInProgress	60929000	USD
CY2021Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1744878000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1601178000	USD
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	3499000	USD
CY2021Q4	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	61623000	USD
CY2020Q4	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	61675000	USD
CY2021Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	3141000	USD
CY2020Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	4785000	USD
CY2021Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	58482000	USD
CY2020Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	56890000	USD
CY2021Q4	cpk	Accrued Revenue AccruedRevenue	22513000	USD
CY2020Q4	cpk	Accrued Revenue AccruedRevenue	21527000	USD
CY2021Q4	us-gaap	Energy Related Inventory Propane Gas EnergyRelatedInventoryPropaneGas	11644000	USD
CY2020Q4	us-gaap	Energy Related Inventory Propane Gas EnergyRelatedInventoryPropaneGas	5906000	USD
CY2021Q4	us-gaap	Other Inventory OtherInventory	9345000	USD
CY2020Q4	us-gaap	Other Inventory OtherInventory	5539000	USD
CY2021Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	19794000	USD
CY2020Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	10786000	USD
CY2021Q4	us-gaap	Energy Related Inventory Natural Gas In Storage EnergyRelatedInventoryNaturalGasInStorage	3691000	USD
CY2020Q4	us-gaap	Energy Related Inventory Natural Gas In Storage EnergyRelatedInventoryNaturalGasInStorage	2455000	USD
CY2021Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	10139000	USD
CY2021Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	17460000	USD
CY2020Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	12885000	USD
CY2021Q4	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	17121000	USD
CY2020Q4	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	13239000	USD
CY2021Q4	us-gaap	Energy Marketing Contracts Assets Current EnergyMarketingContractsAssetsCurrent	7076000	USD
CY2020Q4	us-gaap	Energy Marketing Contracts Assets Current EnergyMarketingContractsAssetsCurrent	3269000	USD
CY2021Q4	us-gaap	Other Assets Current OtherAssetsCurrent	1033000	USD
CY2020Q4	us-gaap	Other Assets Current OtherAssetsCurrent	436000	USD
CY2021Q4	us-gaap	Assets Current AssetsCurrent	173135000	USD
CY2020Q4	us-gaap	Assets Current AssetsCurrent	136431000	USD
CY2021Q4	us-gaap	Goodwill Goodwill	44708000	USD
CY2020Q4	us-gaap	Goodwill Goodwill	38731000	USD
CY2021Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	13192000	USD
CY2020Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	8292000	USD
CY2021Q4	us-gaap	Investments Fair Value Disclosure InvestmentsFairValueDisclosure	12095000	USD
CY2020Q4	us-gaap	Investments Fair Value Disclosure InvestmentsFairValueDisclosure	10776000	USD
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	11194000	USD
CY2021Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	104173000	USD
CY2020Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	113806000	USD
CY2021Q4	cpk	Receivables And Other Deferred Charges ReceivablesAndOtherDeferredCharges	12549000	USD
CY2020Q4	cpk	Receivables And Other Deferred Charges ReceivablesAndOtherDeferredCharges	12079000	USD
CY2021Q4	cpk	Deferred Charges And Other Assets DeferredChargesAndOtherAssets	196856000	USD
CY2020Q4	cpk	Deferred Charges And Other Assets DeferredChargesAndOtherAssets	194878000	USD
CY2021Q4	us-gaap	Assets Assets	2114869000	USD
CY2020Q4	us-gaap	Assets Assets	1932487000	USD
CY2021Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2020Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2021Q4	us-gaap	Common Stock Value CommonStockValue	8593000	USD
CY2020Q4	us-gaap	Common Stock Value CommonStockValue	8499000	USD
CY2021Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	371162000	USD
CY2020Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	348482000	USD
CY2021Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	393072000	USD
CY2020Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	342969000	USD
CY2021Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	1303000	USD
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-2865000	USD
CY2021Q4	us-gaap	Compensation And Benefits Trust CompensationAndBenefitsTrust	7240000	USD
CY2020Q4	us-gaap	Compensation And Benefits Trust CompensationAndBenefitsTrust	5679000	USD
CY2021Q4	us-gaap	Treasury Stock Value TreasuryStockValue	7240000	USD
CY2020Q4	us-gaap	Treasury Stock Value TreasuryStockValue	5679000	USD
CY2021Q4	us-gaap	Stockholders Equity StockholdersEquity	774130000	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	697085000	USD
CY2021Q4	cpk	Longterm Debtand Capital Lease Obligations Netof Current Maturities LongtermDebtandCapitalLeaseObligationsNetofCurrentMaturities	549903000	USD
CY2020Q4	cpk	Longterm Debtand Capital Lease Obligations Netof Current Maturities LongtermDebtandCapitalLeaseObligationsNetofCurrentMaturities	508499000	USD
CY2021Q4	us-gaap	Capitalization Longterm Debt And Equity CapitalizationLongtermDebtAndEquity	1324033000	USD
CY2020Q4	us-gaap	Capitalization Longterm Debt And Equity CapitalizationLongtermDebtAndEquity	1205584000	USD
CY2021Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	17962000	USD
CY2020Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	13600000	USD
CY2021Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	221634000	USD
CY2021Q4	us-gaap	Contract With Customer Refund Liability Current ContractWithCustomerRefundLiabilityCurrent	36488000	USD
CY2020Q4	us-gaap	Contract With Customer Refund Liability Current ContractWithCustomerRefundLiabilityCurrent	33302000	USD
CY2020Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	175644000	USD
CY2021Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	52628000	USD
CY2020Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	60253000	USD
CY2021Q4	us-gaap	Interest Payable Current InterestPayableCurrent	2775000	USD
CY2020Q4	us-gaap	Interest Payable Current InterestPayableCurrent	2905000	USD
CY2021Q4	us-gaap	Dividends Payable Current DividendsPayableCurrent	8466000	USD
CY2020Q4	us-gaap	Dividends Payable Current DividendsPayableCurrent	7683000	USD
CY2021Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	15505000	USD
CY2020Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	13994000	USD
CY2021Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	2312000	USD
CY2020Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	6284000	USD
CY2021Q4	us-gaap	Energy Marketing Contract Liabilities Current EnergyMarketingContractLiabilitiesCurrent	743000	USD
CY2020Q4	us-gaap	Energy Marketing Contract Liabilities Current EnergyMarketingContractLiabilitiesCurrent	127000	USD
CY2021Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	17920000	USD
CY2020Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	15240000	USD
CY2021Q4	us-gaap	Liabilities Current LiabilitiesCurrent	376433000	USD
CY2020Q4	us-gaap	Liabilities Current LiabilitiesCurrent	329032000	USD
CY2021Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	233550000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	205388000	USD
CY2021Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	142488000	USD
CY2020Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	142736000	USD
CY2021Q4	us-gaap	Accrued Environmental Loss Contingencies Noncurrent AccruedEnvironmentalLossContingenciesNoncurrent	3538000	USD
CY2020Q4	us-gaap	Accrued Environmental Loss Contingencies Noncurrent AccruedEnvironmentalLossContingenciesNoncurrent	4299000	USD
CY2021Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	24120000	USD
CY2020Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	30673000	USD
CY2021Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	8571000	USD
CY2020Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	9872000	USD
CY2021Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	2136000	USD
CY2020Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	4903000	USD
CY2021Q4	us-gaap	Deferred Credits And Other Liabilities DeferredCreditsAndOtherLiabilities	414403000	USD
CY2020Q4	us-gaap	Deferred Credits And Other Liabilities DeferredCreditsAndOtherLiabilities	397871000	USD
CY2021Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2020Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2021Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	2114869000	USD
CY2020Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1932487000	USD
CY2021	us-gaap	Net Income Loss NetIncomeLoss	83466000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	71498000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	65153000	USD
CY2021	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	62661000	USD
CY2020	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	58117000	USD
CY2019	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	45900000	USD
CY2021	cpk	Depreciation And Accretion Included In Other Costs DepreciationAndAccretionIncludedInOtherCosts	10228000	USD
CY2020	cpk	Depreciation And Accretion Included In Other Costs DepreciationAndAccretionIncludedInOtherCosts	9599000	USD
CY2019	cpk	Depreciation And Accretion Included In Other Costs DepreciationAndAccretionIncludedInOtherCosts	8752000	USD
CY2021	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-26658000	USD
CY2020	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-24709000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	184727000	USD
CY2021	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	1033000	USD
CY2019	cpk	Discontinued Operation Gain Loss From Disposal Of Discontinued Operation Before Income Tax Incremental DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTaxIncremental	7344000	USD
CY2019	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-24476000	USD
CY2021	cpk	Discontinued Operation Gain Loss From Disposal Of Discontinued Operation Before Income Tax Incremental DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTaxIncremental	0	USD
CY2020	cpk	Discontinued Operation Gain Loss From Disposal Of Discontinued Operation Before Income Tax Incremental DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTaxIncremental	200000	USD
CY2021	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	9026000	USD
CY2020	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	6243000	USD
CY2019	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	4135000	USD
CY2021	us-gaap	Unrealized Gain Loss On Commodity Contracts UnrealizedGainLossOnCommodityContracts	1464000	USD
CY2020	us-gaap	Unrealized Gain Loss On Commodity Contracts UnrealizedGainLossOnCommodityContracts	1482000	USD
CY2019	us-gaap	Unrealized Gain Loss On Commodity Contracts UnrealizedGainLossOnCommodityContracts	1595000	USD
CY2021	us-gaap	Employee Benefits And Share Based Compensation EmployeeBenefitsAndShareBasedCompensation	-53000	USD
CY2020	us-gaap	Employee Benefits And Share Based Compensation EmployeeBenefitsAndShareBasedCompensation	207000	USD
CY2019	us-gaap	Employee Benefits And Share Based Compensation EmployeeBenefitsAndShareBasedCompensation	1985000	USD
CY2021	us-gaap	Share Based Compensation ShareBasedCompensation	5945000	USD
CY2020	us-gaap	Share Based Compensation ShareBasedCompensation	4829000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	4279000	USD
CY2019	cpk	Payments For Environmental Expenditures PaymentsForEnvironmentalExpenditures	1170000	USD
CY2020	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	8080000	USD
CY2021	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-223023000	USD
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-181631000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-186587000	USD
CY2021	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	1634000	USD
CY2020	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	7426000	USD
CY2019	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-36489000	USD
CY2021	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	9517000	USD
CY2020	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-1709000	USD
CY2019	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-8227000	USD
CY2021	us-gaap	Increase Decrease In Regulatory Assets And Liabilities IncreaseDecreaseInRegulatoryAssetsAndLiabilities	18464000	USD
CY2020	us-gaap	Increase Decrease In Regulatory Assets And Liabilities IncreaseDecreaseInRegulatoryAssetsAndLiabilities	4973000	USD
CY2019	us-gaap	Increase Decrease In Regulatory Assets And Liabilities IncreaseDecreaseInRegulatoryAssetsAndLiabilities	7812000	USD
CY2021	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	1520000	USD
CY2020	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-2424000	USD
CY2019	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-11115000	USD
CY2021	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	8285000	USD
CY2020	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	4941000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-62021000	USD
CY2021	us-gaap	Increase Decrease In Income Taxes Receivable IncreaseDecreaseInIncomeTaxesReceivable	4575000	USD
CY2021	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	31537000	USD
CY2020	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	27161000	USD
CY2019	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	427000	USD
CY2021	us-gaap	Payments To Acquire Businesses Gross PaymentsToAcquireBusinessesGross	36371000	USD
CY2020	us-gaap	Payments To Acquire Businesses Gross PaymentsToAcquireBusinessesGross	22231000	USD
CY2019	us-gaap	Payments To Acquire Businesses Gross PaymentsToAcquireBusinessesGross	23988000	USD
CY2021	cpk	Proceeds From Divestiture Of Businesses Incremental ProceedsFromDivestitureOfBusinessesIncremental	0	USD
CY2020	cpk	Proceeds From Divestiture Of Businesses Incremental ProceedsFromDivestitureOfBusinessesIncremental	200000	USD
CY2019	cpk	Proceeds From Divestiture Of Businesses Incremental ProceedsFromDivestitureOfBusinessesIncremental	22871000	USD
CY2021	cpk	Payments For Environmental Expenditures PaymentsForEnvironmentalExpenditures	761000	USD
CY2020	cpk	Payments For Environmental Expenditures PaymentsForEnvironmentalExpenditures	2169000	USD
CY2020	us-gaap	Increase Decrease In Income Taxes Receivable IncreaseDecreaseInIncomeTaxesReceivable	-7165000	USD
CY2019	us-gaap	Increase Decrease In Income Taxes Receivable IncreaseDecreaseInIncomeTaxesReceivable	4750000	USD
CY2021	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	3176000	USD
CY2020	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	2238000	USD
CY2019	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	-1811000	USD
CY2021	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	1198000	USD
CY2020	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	-2473000	USD
CY2019	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	2120000	USD
CY2021	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-4860000	USD
CY2020	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-5723000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-16064000	USD
CY2021	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	150504000	USD
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	158916000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	102964000	USD
CY2021	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	186924000	USD
CY2020	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	165511000	USD
CY2019	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	24693000	USD
CY2021	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	-15851000	USD
CY2019	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	199648000	USD
CY2019	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	41936000	USD
CY2021	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	73996000	USD
CY2021	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	13811000	USD
CY2020	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	53600000	USD
CY2020	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	-22627000	USD
CY2019	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	721000	USD
CY2021	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	USD
CY2020	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	60980000	USD
CY2019	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	USD
CY2021	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	1478000	USD
CY2020	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	977000	USD
CY2019	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	692000	USD
CY2021	us-gaap	Increase Decrease In Outstanding Checks Financing Activities IncreaseDecreaseInOutstandingChecksFinancingActivities	-1154000	USD
CY2020	us-gaap	Increase Decrease In Outstanding Checks Financing Activities IncreaseDecreaseInOutstandingChecksFinancingActivities	-825000	USD
CY2019	us-gaap	Increase Decrease In Outstanding Checks Financing Activities IncreaseDecreaseInOutstandingChecksFinancingActivities	-1174000	USD
CY2021	us-gaap	Proceeds From Repayments Of Lines Of Credit ProceedsFromRepaymentsOfLinesOfCredit	46647000	USD
CY2020	us-gaap	Proceeds From Repayments Of Lines Of Credit ProceedsFromRepaymentsOfLinesOfCredit	-71637000	USD
CY2019	us-gaap	Proceeds From Repayments Of Lines Of Credit ProceedsFromRepaymentsOfLinesOfCredit	-45913000	USD
CY2021	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	59478000	USD
CY2020	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	89822000	USD
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	19229000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	84519000	USD
CY2021	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	1477000	USD
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-3486000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	896000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	3499000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	6985000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	6089000	USD
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	4976000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	3499000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	6985000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	518439000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	65153000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	561000	USD
CY2019	us-gaap	Dividends Dividends	26191000	USD
CY2019	cpk	Stock Issued During The Period Value Retirement Savings Plan And Dividend Reinvestment Plan StockIssuedDuringThePeriodValueRetirementSavingsPlanAndDividendReinvestmentPlan	3000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	561577000	USD
CY2019	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	3618000	USD
CY2019	cpk	Treasury Stock Activity And Deferred Compensation Plan Activity During Period Value TreasuryStockActivityAndDeferredCompensationPlanActivityDuringPeriodValue	0	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	71498000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	3402000	USD
CY2020	us-gaap	Dividends Dividends	29106000	USD
CY2020	cpk	Stock Issued During The Period Value Retirement Savings Plan And Dividend Reinvestment Plan StockIssuedDuringThePeriodValueRetirementSavingsPlanAndDividendReinvestmentPlan	-85851000	USD
CY2020	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	3893000	USD
CY2020	cpk	New Accounting Pronouncement Of Change In Accounting Principle Effect Of Adoption NewAccountingPronouncementOfChangeInAccountingPrincipleEffectOfAdoption	-30000	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	697085000	USD
CY2021	us-gaap	Net Income Loss NetIncomeLoss	83466000	USD
CY2021	us-gaap	Net Income Loss NetIncomeLoss	83466000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	4168000	USD
CY2021	us-gaap	Dividends Dividends	33363000	USD
CY2021	cpk	Stock Issued Value During The Period Shares Retirement Savings Plan And Dividend Reinvestment Plan StockIssuedValueDuringThePeriodSharesRetirementSavingsPlanAndDividendReinvestmentPlan	18248000	USD
CY2021	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	4526000	USD
CY2021Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	417479000	USD
CY2020Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	368743000	USD
CY2021Q4	cpk	Construction Work In Progress ConstructionWorkInProgress	49393000	USD
CY2020Q4	cpk	Shares Held In Trust For Deferred Compensation Plan SharesHeldInTrustForDeferredCompensationPlan	105087	shares
CY2020Q4	cpk	Construction Work In Progress ConstructionWorkInProgress	60929000	USD
CY2021Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1744878000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1601178000	USD
CY2021Q4	us-gaap	Contributions In Aid Of Construction ContributionsInAidOfConstruction	6300000	USD
CY2020Q4	us-gaap	Contributions In Aid Of Construction ContributionsInAidOfConstruction	3700000	USD
CY2021	us-gaap	Public Utilities Allowance For Funds Used During Construction Additions PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions	400000	USD
CY2020	us-gaap	Public Utilities Allowance For Funds Used During Construction Additions PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions	700000	USD
CY2019	us-gaap	Public Utilities Allowance For Funds Used During Construction Additions PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions	700000	USD
CY2019Q4	cpk	Shares Held In Trust For Deferred Compensation Plan SharesHeldInTrustForDeferredCompensationPlan	95329	shares
CY2021Q4	us-gaap	Stockholders Equity StockholdersEquity	774130000	USD
CY2021Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	2000000	shares
CY2021Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2021Q4	cpk	Shares Held In Trust For Deferred Compensation Plan SharesHeldInTrustForDeferredCompensationPlan	116238	shares
CY2021	cpk	Shares Issued Under Performance Incentive Plan Withheld For Employee Taxes SharesIssuedUnderPerformanceIncentivePlanWithheldForEmployeeTaxes	14020	shares
CY2020	cpk	Shares Issued Under Performance Incentive Plan Withheld For Employee Taxes SharesIssuedUnderPerformanceIncentivePlanWithheldForEmployeeTaxes	10319	shares
CY2019	cpk	Shares Issued Under Performance Incentive Plan Withheld For Employee Taxes SharesIssuedUnderPerformanceIncentivePlanWithheldForEmployeeTaxes	7635	shares
CY2021	us-gaap	Use Of Estimates UseOfEstimates	Use of EstimatesThe 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 about various future economic factors that are difficult to predict and are beyond our control; therefore, actual results could differ from these estimates. As additional information becomes available, or actual amounts are determined, recorded estimates are revised. Consequently, operating results can be affected by revisions to prior accounting estimates.
CY2021Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	2112964000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	1908992000	USD
CY2021	cpk	Numberof Monthsto Establish Rou Assetand Liability NumberofMonthstoEstablishROUAssetandLiability	P12M
CY2021	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	10200000	USD
CY2020	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	9600000	USD
CY2019	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	8800000	USD
CY2021	cpk	Delayof Revenue Recognition Due To Implementationof New Standard DelayofRevenueRecognitionDueToImplementationofNewStandard	2	utility
CY2021	cpk	Lengthoftimeuntildeferredamountsrecoveredorrefunded Lengthoftimeuntildeferredamountsrecoveredorrefunded	1
CY2021	cpk	Maturity Period To Be Considered Cash Equivalents MaturityPeriodToBeConsideredCashEquivalents	P3M
CY2020Q4	cpk	Accounts Receivable Allowance For Credit Losses Current Disclosure AccountsReceivableAllowanceForCreditLossesCurrentDisclosure	4785000	USD
CY2021	us-gaap	Provision For Other Credit Losses ProvisionForOtherCreditLosses	134000	USD
CY2021	us-gaap	Allowance For Doubtful Accounts Receivable Recoveries AllowanceForDoubtfulAccountsReceivableRecoveries	-125000	USD
CY2021	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	1653000	USD
CY2021Q4	cpk	Accounts Receivable Allowance For Credit Losses Current Disclosure AccountsReceivableAllowanceForCreditLossesCurrentDisclosure	3141000	USD
CY2021	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	83467000	USD
CY2020	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	70642000	USD
CY2019	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	61100000	USD
CY2021	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	-1000	USD
CY2020	cpk	Discontinued Operation Gain Losson Disposalof Discontinued Operation Netof Lossfrom Discontinued Operations Netof Tax DiscontinuedOperationGainLossonDisposalofDiscontinuedOperationNetofLossfromDiscontinuedOperationsNetofTax	856000	USD
CY2019	cpk	Discontinued Operation Gain Losson Disposalof Discontinued Operation Netof Lossfrom Discontinued Operations Netof Tax DiscontinuedOperationGainLossonDisposalofDiscontinuedOperationNetofLossfromDiscontinuedOperationsNetofTax	4053000	USD
CY2021	us-gaap	Net Income Loss NetIncomeLoss	83466000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	71498000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	65153000	USD
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	17558078	shares
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16711579	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16398443	shares
CY2021	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	4.75
CY2020	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	4.23
CY2019	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	3.73
CY2021	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Basic Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare	0
CY2020	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Basic Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare	0.05
CY2019	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Basic Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare	0.24
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.75
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.28
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.97
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	17558078	shares
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16711579	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16398443	shares
CY2021	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	74951	shares
CY2020	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	59156	shares
CY2019	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	50043	shares
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	17633029	shares
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.73
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	16770735	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	16448486	shares
CY2021	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	4.73
CY2020	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	4.21
CY2019	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	3.72
CY2021	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax Per Diluted Share DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerDilutedShare	0
CY2020	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax Per Diluted Share DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerDilutedShare	0.05
CY2019	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax Per Diluted Share DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerDilutedShare	0.24
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.26
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.96
CY2021	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	569968000	USD
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	488198000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	479605000	USD
CY2020Q4	us-gaap	Receivables From Customers ReceivablesFromCustomers	55600000	USD
CY2020Q4	us-gaap	Contract With Customer Asset Net Noncurrent ContractWithCustomerAssetNetNoncurrent	4816000	USD
CY2020Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	644000	USD
CY2021Q4	us-gaap	Receivables From Customers ReceivablesFromCustomers	56277000	USD
CY2021Q4	us-gaap	Contract With Customer Asset Net Noncurrent ContractWithCustomerAssetNetNoncurrent	4806000	USD
CY2021Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	747000	USD
CY2021	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	677000	USD
CY2021	us-gaap	Increase Decrease In Other Noncurrent Assets IncreaseDecreaseInOtherNoncurrentAssets	-10000	USD
CY2021	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	103000	USD
CY2021	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	1100000	USD
CY2020	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	1300000	USD
CY2021	us-gaap	Operating Income Loss OperatingIncomeLoss	131112000	USD
CY2020	us-gaap	Operating Income Loss OperatingIncomeLoss	112723000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	106285000	USD
CY2021	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	1721000	USD
CY2020	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	3222000	USD
CY2019	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-1847000	USD
CY2021	us-gaap	Interest Expense InterestExpense	20135000	USD
CY2020	us-gaap	Interest Expense InterestExpense	21765000	USD
CY2019	us-gaap	Interest Expense InterestExpense	22224000	USD
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	112698000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	94180000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	82214000	USD
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	29231000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	23538000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	21114000	USD
CY2021	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	83467000	USD
CY2020	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	70642000	USD
CY2019	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	61100000	USD
CY2021	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	-1000	USD
CY2020	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	686000	USD
CY2019	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	-1349000	USD
CY2020	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	170000	USD
CY2019	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	5402000	USD
CY2021	us-gaap	Net Income Loss NetIncomeLoss	83466000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	71498000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	65153000	USD
CY2021	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	62661000	USD
CY2020	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	58117000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	45424000	USD
CY2021Q4	us-gaap	Assets Assets	2114869000	USD
CY2020Q4	us-gaap	Assets Assets	1932487000	USD
CY2021	us-gaap	Interest Paid InterestPaid	20809000	USD
CY2020	us-gaap	Interest Paid InterestPaid	22884000	USD
CY2019	us-gaap	Interest Paid InterestPaid	23856000	USD
CY2021	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	8395000	USD
CY2020	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-8135000	USD
CY2019	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	3221000	USD
CY2021	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	16164000	USD
CY2020	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	23625000	USD
CY2019	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	13470000	USD
CY2021	cpk	Non Cash Performance Incentive Plan Retirement NonCashPerformanceIncentivePlanRetirement	1712000	USD
CY2020	cpk	Non Cash Performance Incentive Plan Retirement NonCashPerformanceIncentivePlanRetirement	1605000	USD
CY2019	cpk	Non Cash Performance Incentive Plan Retirement NonCashPerformanceIncentivePlanRetirement	0	USD
CY2021	cpk	Non Cash Performance Incentive Plan Expenses NonCashPerformanceIncentivePlanExpenses	2834000	USD
CY2020	cpk	Non Cash Performance Incentive Plan Expenses NonCashPerformanceIncentivePlanExpenses	1971000	USD
CY2019	cpk	Non Cash Performance Incentive Plan Expenses NonCashPerformanceIncentivePlanExpenses	1691000	USD
CY2020	us-gaap	Notional Amount Of Nonderivative Instruments NotionalAmountOfNonderivativeInstruments	100000000	USD
CY2021	cpk	Number Of Short Term Lines Of Credit Rate Swap NumberOfShortTermLinesOfCreditRateSwap	3	pure
CY2021Q4	us-gaap	Notional Amount Of Nonderivative Instruments NotionalAmountOfNonderivativeInstruments	60000000	USD
CY2021Q4	us-gaap	Energy Marketing Contracts Assets Current EnergyMarketingContractsAssetsCurrent	7076000	USD
CY2020Q4	us-gaap	Energy Marketing Contracts Assets Current EnergyMarketingContractsAssetsCurrent	3269000	USD
CY2021Q4	us-gaap	Energy Marketing Contract Liabilities Current EnergyMarketingContractLiabilitiesCurrent	743000	USD
CY2020Q4	us-gaap	Energy Marketing Contract Liabilities Current EnergyMarketingContractLiabilitiesCurrent	127000	USD
CY2021	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	9724000	USD
CY2020	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	7505000	USD
CY2019	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	910000	USD
CY2020Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	2156000	USD
CY2019Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	803000	USD
CY2021	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases Sales Issuances Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements	88000	USD
CY2020	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases Sales Issuances Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements	261000	USD
CY2021	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Net FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet	-241000	USD
CY2020	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Net FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet	1065000	USD
CY2021	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings1 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1	33000	USD
CY2020	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings1 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1	27000	USD
CY2021Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	2036000	USD
CY2020Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	2156000	USD
CY2021Q4	us-gaap	Long Term Debt LongTermDebt	568800000	USD
CY2021Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	597200000	USD
CY2020Q4	us-gaap	Long Term Debt LongTermDebt	523000000	USD
CY2020Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	548500000	USD
CY2021Q4	us-gaap	Investments Fair Value Disclosure InvestmentsFairValueDisclosure	12095000	USD
CY2020Q4	us-gaap	Investments Fair Value Disclosure InvestmentsFairValueDisclosure	10776000	USD
CY2021	us-gaap	Trading Securities Unrealized Holding Gain Loss TradingSecuritiesUnrealizedHoldingGainLoss	1500000	USD
CY2020	us-gaap	Trading Securities Unrealized Holding Gain Loss TradingSecuritiesUnrealizedHoldingGainLoss	1500000	USD
CY2019	us-gaap	Trading Securities Unrealized Holding Gain Loss TradingSecuritiesUnrealizedHoldingGainLoss	1600000	USD
CY2020Q4	us-gaap	Goodwill Goodwill	38731000	USD
CY2019	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	-2790000	USD
CY2019Q4	cpk	Net Operating Losses And Tax Carryforwards NetOperatingLossesAndTaxCarryforwards	6300000	USD
CY2021	us-gaap	Goodwill Transfers GoodwillTransfers	5977000	USD
CY2021Q4	us-gaap	Goodwill Goodwill	44708000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	19967000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	6775000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	13777000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	5485000	USD
CY2021	us-gaap	Acquired Finite Lived Intangible Assets Weighted Average Useful Life AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife	P12Y
CY2021	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1300000	USD
CY2020	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1200000	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	800000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	1400000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	1300000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	1100000	USD
CY2018Q4	cpk	Net Operating Losses And Tax Carryforwards NetOperatingLossesAndTaxCarryforwards	-12200000	USD
CY2021Q4	cpk	Deferred Tax Assets Operating Loss Carryforwards Total DeferredTaxAssetsOperatingLossCarryforwardsTotal	1500000	USD
CY2020Q4	cpk	Deferred Tax Assets Operating Loss Carryforwards Total DeferredTaxAssetsOperatingLossCarryforwardsTotal	1600000	USD
CY2021Q4	cpk	Net Operating Losses And Tax Carryback Total NetOperatingLossesAndTaxCarrybackTotal	-900000	USD
CY2020Q4	cpk	Net Operating Losses And Tax Carryback Total NetOperatingLossesAndTaxCarrybackTotal	-1800000	USD
CY2021	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	2775000	USD
CY2020	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-2777000	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-2252000	USD
CY2021	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	-96000	USD
CY2020	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	2162000	USD
CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	-491000	USD
CY2021	us-gaap	Income Tax Credits And Adjustments IncomeTaxCreditsAndAdjustments	-47000	USD
CY2020	us-gaap	Income Tax Credits And Adjustments IncomeTaxCreditsAndAdjustments	-47000	USD
CY2019	us-gaap	Income Tax Credits And Adjustments IncomeTaxCreditsAndAdjustments	-47000	USD
CY2021	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	2632000	USD
CY2020	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	-662000	USD
CY2021	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	26599000	USD
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	24200000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	23904000	USD
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	29231000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	23538000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	21114000	USD
CY2021	us-gaap	Discontinued Operation Tax Effect Of Income Loss From Disposal Of Discontinued Operation DiscontinuedOperationTaxEffectOfIncomeLossFromDisposalOfDiscontinuedOperation	0	USD
CY2020	us-gaap	Discontinued Operation Tax Effect Of Income Loss From Disposal Of Discontinued Operation DiscontinuedOperationTaxEffectOfIncomeLossFromDisposalOfDiscontinuedOperation	153000	USD
CY2019	us-gaap	Discontinued Operation Tax Effect Of Income Loss From Disposal Of Discontinued Operation DiscontinuedOperationTaxEffectOfIncomeLossFromDisposalOfDiscontinuedOperation	1416000	USD
CY2021	us-gaap	Income Tax Expense Benefit Continuing Operations Discontinued Operations Extraordinary Items IncomeTaxExpenseBenefitContinuingOperationsDiscontinuedOperationsExtraordinaryItems	29231000	USD
CY2020	us-gaap	Income Tax Expense Benefit Continuing Operations Discontinued Operations Extraordinary Items IncomeTaxExpenseBenefitContinuingOperationsDiscontinuedOperationsExtraordinaryItems	23691000	USD
CY2019	us-gaap	Income Tax Expense Benefit Continuing Operations Discontinued Operations Extraordinary Items IncomeTaxExpenseBenefitContinuingOperationsDiscontinuedOperationsExtraordinaryItems	22530000	USD
CY2021	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	8200000	USD
CY2020	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	4900000	USD
CY2019	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	4700000	USD
CY2021	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	23666000	USD
CY2020	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	19778000	USD
CY2019	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	17264000	USD
CY2021	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	6371000	USD
CY2020	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	5051000	USD
CY2019	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	5093000	USD
CY2021	us-gaap	Income Tax Rate Reconciliation Deductions Employee Stock Ownership Plan Dividends IncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends	180000	USD
CY2020	us-gaap	Income Tax Rate Reconciliation Deductions Employee Stock Ownership Plan Dividends IncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends	218000	USD
CY2019	us-gaap	Income Tax Rate Reconciliation Deductions Employee Stock Ownership Plan Dividends IncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends	173000	USD
CY2021	cpk	Net Operating Losses And Tax Carryback NetOperatingLossesAndTaxCarryback	-919000	USD
CY2020	cpk	Net Operating Losses And Tax Carryback NetOperatingLossesAndTaxCarryback	-1841000	USD
CY2021	us-gaap	Income Tax Reconciliation Nondeductible Expense Depreciation IncomeTaxReconciliationNondeductibleExpenseDepreciation	-15000	USD
CY2021	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	308000	USD
CY2020	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	768000	USD
CY2019	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-1070000	USD
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	29231000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	23538000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	21114000	USD
CY2021	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.2594
CY2020	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.2499
CY2019	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.2565
CY2021	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21
CY2021Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	224034000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	199287000	USD
CY2021Q4	cpk	Deferred Income Tax On Acquisition Adjustment DeferredIncomeTaxOnAcquisitionAdjustment	6266000	USD
CY2020Q4	cpk	Deferred Income Tax On Acquisition Adjustment DeferredIncomeTaxOnAcquisitionAdjustment	6618000	USD
CY2021Q4	cpk	Deferred Tax Liabilities Loss On Reacquired Debt DeferredTaxLiabilitiesLossOnReacquiredDebt	183000	USD
CY2020Q4	cpk	Deferred Tax Liabilities Loss On Reacquired Debt DeferredTaxLiabilitiesLossOnReacquiredDebt	201000	USD
CY2021Q4	cpk	Deferred Income Tax Liability Deferred Gas Costs DeferredIncomeTaxLiabilityDeferredGasCosts	2366000	USD
CY2020Q4	cpk	Deferred Income Tax Liability Deferred Gas Costs DeferredIncomeTaxLiabilityDeferredGasCosts	509000	USD
CY2021Q4	cpk	Deferred Income Tax Liability Natural Gas Conversion Costs DeferredIncomeTaxLiabilityNaturalGasConversionCosts	5529000	USD
CY2020Q4	cpk	Deferred Income Tax Liability Natural Gas Conversion Costs DeferredIncomeTaxLiabilityNaturalGasConversionCosts	5379000	USD
CY2021Q4	cpk	Deferred Income Tax Liability Storm Reserve DeferredIncomeTaxLiabilityStormReserve	5783000	USD
CY2020Q4	cpk	Deferred Income Tax Liability Storm Reserve DeferredIncomeTaxLiabilityStormReserve	7073000	USD
CY2021Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	6301000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits	5354000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	5587000	USD
CY2021Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	250462000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	224654000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits	4636000	USD
CY2021Q4	cpk	Deferred Tax Assets Environmental DeferredTaxAssetsEnvironmental	996000	USD
CY2020Q4	cpk	Deferred Tax Assets Environmental DeferredTaxAssetsEnvironmental	1064000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	1490000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	1587000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Reserves DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves	448000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Reserves DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves	409000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals	4843000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals	6153000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	3781000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	5417000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	16912000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	19266000	USD
CY2021Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	233550000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	205388000	USD
CY2021Q4	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	913000	USD
CY2020Q4	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	901000	USD
CY2021Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	567865000	USD
CY2020Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	522099000	USD
CY2021Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	17962000	USD
CY2020Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	13600000	USD
CY2021Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	549903000	USD
CY2020Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	508499000	USD
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Rolling Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextRollingTwelveMonths	17962000	USD
CY2021Q4	cpk	Total Future Repayments TotalFutureRepayments	568778000	USD
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Rolling Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingYearTwo	21483000	USD
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Rolling Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingYearThree	18505000	USD
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Rolling Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingYearFour	25528000	USD
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Rolling Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingYearFive	34551000	USD
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Rolling After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingAfterYearFive	450749000	USD
CY2021Q4	us-gaap	Debt Instrument Unused Borrowing Capacity Amount DebtInstrumentUnusedBorrowingCapacityAmount	250000000	USD
CY2021Q4	cpk	Common Stock Equity To Total Capitalization CommonStockEquityToTotalCapitalization	0.40
CY2021Q4	cpk	Required Fixed Charge Coverage Ratio RequiredFixedChargeCoverageRatio	1.2
CY2021Q4	cpk	Debt Instrument Restrictive Covenants Required Net Book Valueof Regulated Business Assets Percentageof Consolidated Total Assets DebtInstrumentRestrictiveCovenantsRequiredNetBookValueofRegulatedBusinessAssetsPercentageofConsolidatedTotalAssets	0.50
CY2021	cpk	Longterm Debt Debt Covenants Maximum Allowable Amountof Restricted Payments LongtermDebtDebtCovenantsMaximumAllowableAmountofRestrictedPayments	10000000	USD
CY2021Q4	cpk	Cumulative Consolidated Net Income CumulativeConsolidatedNetIncome	664500000	USD
CY2021Q4	cpk	Restricted Payment RestrictedPayment	289400000	USD
CY2021Q4	cpk	Unrestricted Payment UnrestrictedPayment	375100000	USD
CY2021Q4	us-gaap	Line Of Credit Facility Remaining Borrowing Capacity LineOfCreditFacilityRemainingBorrowingCapacity	173100000	USD
CY2020Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	175600000	USD
CY2021Q4	us-gaap	Short Term Debt Weighted Average Interest Rate ShortTermDebtWeightedAverageInterestRate	0.0083
CY2021Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	5300000	USD
CY2021	us-gaap	Notional Amount Of Nonderivative Instruments NotionalAmountOfNonderivativeInstruments	30000000	USD
CY2020Q4	us-gaap	Short Term Debt Weighted Average Interest Rate ShortTermDebtWeightedAverageInterestRate	0.0128
CY2021Q4	us-gaap	Financing Receivable Revolving FinancingReceivableRevolving	400000000	USD
CY2021Q4	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	200000000	USD
CY2021Q4	us-gaap	Ratio Of Indebtedness To Net Capital1 RatioOfIndebtednessToNetCapital1	0.65
CY2021	us-gaap	Line Of Credit Facility Commitment Fee Percentage LineOfCreditFacilityCommitmentFeePercentage	0.95
CY2021Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	221600000	USD
CY2021Q4	us-gaap	Notional Amount Of Nonderivative Instruments NotionalAmountOfNonderivativeInstruments	60000000	USD
CY2021	us-gaap	Operating Lease Cost OperatingLeaseCost	2064000	USD
CY2020	us-gaap	Operating Lease Cost OperatingLeaseCost	2029000	USD
CY2021Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	10139000	USD
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	11194000	USD
CY2021Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	1996000	USD
CY2020Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	1747000	USD
CY2021Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	8571000	USD
CY2020Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	9872000	USD
CY2021Q4	cpk	Total Operatingand Finance Lease Liabilities TotalOperatingandFinanceLeaseLiabilities	10567000	USD
CY2020Q4	cpk	Total Operatingand Finance Lease Liabilities TotalOperatingandFinanceLeaseLiabilities	11619000	USD
CY2021Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P8Y1M6D
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	3668000	USD
CY2020	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	1436000	USD
CY2020Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P8Y8M12D
CY2021Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.036
CY2020Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.038
CY2021	us-gaap	Operating Lease Payments OperatingLeasePayments	1996000	USD
CY2020	us-gaap	Operating Lease Payments OperatingLeasePayments	1956000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	2019000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	1902000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	1672000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	1341000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	885000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	11487000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	-920000	USD
CY2021Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	10567000	USD
CY2021Q4	cpk	Lessee Future Operating Lease Option Payments LesseeFutureOperatingLeaseOptionPayments	2100000	USD
CY2021Q4	cpk	Common Stock Shares Issued At The Market CommonStockSharesIssuedAtTheMarket	700000	shares
CY2021Q4	cpk	Shares Issued Price Per Share At The Market SharesIssuedPricePerShareAtTheMarket	82.93
CY2021	cpk	Proceeds From Issuance Of Common Stock At The Market ProceedsFromIssuanceOfCommonStockAtTheMarket	61000000	USD
CY2021	cpk	Fees On Equity Issuance At The Market FeesOnEquityIssuanceAtTheMarket	1500000	USD
CY2021	us-gaap	Stock Issued During Period Shares Dividend Reinvestment Plan StockIssuedDuringPeriodSharesDividendReinvestmentPlan	100000	shares
CY2021	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	125.71	USD
CY2021	us-gaap	Proceeds From Issuance Of Common Stock Dividend Reinvestment Plan ProceedsFromIssuanceOfCommonStockDividendReinvestmentPlan	15200000	USD
CY2020	us-gaap	Stock Issued During Period Shares Dividend Reinvestment Plan StockIssuedDuringPeriodSharesDividendReinvestmentPlan	300000	shares
CY2020	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	86.12	USD
CY2020	us-gaap	Proceeds From Issuance Of Common Stock Dividend Reinvestment Plan ProceedsFromIssuanceOfCommonStockDividendReinvestmentPlan	22000000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-6267000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	4838000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	3402000	USD
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-2865000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	7337000	USD
CY2021	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	3169000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	4168000	USD
CY2021Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	1303000	USD
CY2021	cpk	Deferred Pension Settlement Expense DeferredPensionSettlementExpense	600000	USD
CY2020Q4	cpk	Numberof Sub Plans NumberofSubPlans	2
CY2021	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	48000	USD
CY2020	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	63000	USD
CY2019	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	74000	USD
CY2019	cpk	Deferred Pension Settlement Expense DeferredPensionSettlementExpense	700000	USD
CY2021	cpk	Deferred Pension Settlement Expense DeferredPensionSettlementExpense	600000	USD
CY2021Q4	cpk	Defined Benefit Plan Alternative Investments Fair Valueof Plan Assets DefinedBenefitPlanAlternativeInvestmentsFairValueofPlanAssets	6782000	USD
CY2020Q4	cpk	Defined Benefit Plan Alternative Investments Fair Valueof Plan Assets DefinedBenefitPlanAlternativeInvestmentsFairValueofPlanAssets	8116000	USD
CY2021	cpk	Expected Amortization Of Pre Merger Regulatory Asset ExpectedAmortizationOfPreMergerRegulatoryAsset	0	USD
CY2021	us-gaap	Defined Benefit Plan Amounts Recognized In Other Comprehensive Income Net Prior Service Cost Credit Before Tax DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax	-293000	USD
CY2021	us-gaap	Defined Benefit Plan Amounts Recognized In Other Comprehensive Income Loss Net Gain Loss Before Tax DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax	-18953000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	18660000	USD
CY2021Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax	-4385000	USD
CY2021Q4	cpk	Defined Benefit Plan Post Merger Regulatory Assets DefinedBenefitPlanPostMergerRegulatoryAssets	14275000	USD
CY2021Q4	us-gaap	Defined Benefit Plan Accumulated Benefit Obligation DefinedBenefitPlanAccumulatedBenefitObligation	18660000	USD
CY2021Q4	cpk	Accumulated Other Comprehensive Income Loss Tax Effect AccumulatedOtherComprehensiveIncomeLossTaxEffect	1100000	USD
CY2021	cpk	Defined Contribution Plan Eligibility Threshold Requisite Service Period DefinedContributionPlanEligibilityThresholdRequisiteServicePeriod	P3M
CY2021	cpk	Defined Contribution Plan Maximum Employer Contribution As Percentage Of Eligible Compensation DefinedContributionPlanMaximumEmployerContributionAsPercentageOfEligibleCompensation	1
CY2021	us-gaap	Defined Contribution Plan Employers Matching Contribution Annual Vesting Percentage DefinedContributionPlanEmployersMatchingContributionAnnualVestingPercentage	1
CY2021	us-gaap	Deferred Compensation Arrangement With Individual Requisite Service Period1 DeferredCompensationArrangementWithIndividualRequisiteServicePeriod1	P2Y
CY2021	cpk	Employee Minimum Age To Participate Under Defined Contribution Plan EmployeeMinimumAgeToParticipateUnderDefinedContributionPlan	P55Y
CY2021Q4	cpk	Deferrals Rates After Deferral Period Ends Minimum DeferralsRatesAfterDeferralPeriodEndsMinimum	0.01
CY2021	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	5900000	USD
CY2020	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	5900000	USD
CY2019	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	5700000	USD
CY2021Q4	us-gaap	Common Stock Capital Shares Reserved For Future Issuance CommonStockCapitalSharesReservedForFutureIssuance	798586	shares
CY2021	cpk	Employee Deferral Rate EmployeeDeferralRate	0.80
CY2021	cpk	Deferred Compensation Employer Matching Contribution Rate DeferredCompensationEmployerMatchingContributionRate	0.06
CY2021	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	5945000	USD
CY2020	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	4829000	USD
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	4279000	USD
CY2021	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	1535000	USD
CY2020	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	1254000	USD
CY2019	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	1117000	USD
CY2021	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	4410000	USD
CY2020	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	3575000	USD
CY2019	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	3162000	USD
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	683	shares
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	887	shares
CY2021Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Share Based Awards Other Than Options EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions	4100000	USD
CY2021	us-gaap	Shares Paid For Tax Withholding For Share Based Compensation SharesPaidForTaxWithholdingForShareBasedCompensation	14020	shares
CY2020	us-gaap	Shares Paid For Tax Withholding For Share Based Compensation SharesPaidForTaxWithholdingForShareBasedCompensation	10319	shares
CY2019	us-gaap	Shares Paid For Tax Withholding For Share Based Compensation SharesPaidForTaxWithholdingForShareBasedCompensation	7635	shares
CY2021	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	1478000	USD
CY2020	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	977000	USD
CY2019	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	692000	USD
CY2021Q4	cpk	Covid19 Regulatory Asset COVID19RegulatoryAsset	2300000	USD
CY2020Q4	cpk	Covid19 Regulatory Asset COVID19RegulatoryAsset	1900000	USD
CY2021Q4	us-gaap	Regulatory Assets RegulatoryAssets	123967000	USD
CY2020Q4	us-gaap	Regulatory Assets RegulatoryAssets	124592000	USD
CY2021Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	144800000	USD
CY2020Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	149020000	USD
CY2021	cpk	Companys Exposure In Number Of Former Manufactured Gas Plant Sites CompanysExposureInNumberOfFormerManufacturedGasPlantSites	7	site
CY2021Q4	cpk	Debt Service Coverage Ratio DebtServiceCoverageRatio	1.25
CY2021	cpk	Ratiobasedonaveragenumberofpriorquarters Ratiobasedonaveragenumberofpriorquarters	6
CY2021Q4	cpk	Minimum Interest Coverage Ratio Under Agreement Two MinimumInterestCoverageRatioUnderAgreementTwo	2
CY2021Q4	cpk	Maximum Debt To Net Capital Ratio Under Agreement Two MaximumDebtToNetCapitalRatioUnderAgreementTwo	65
CY2021	cpk	Number Of Yearsto Collect Benefits NumberOfYearstoCollectBenefits	P20Y
CY2021	cpk	Number Of Yearsto Collect Benefits NumberOfYearstoCollectBenefits	P20Y
CY2021Q4	us-gaap	Purchase Obligation Due In Next Twelve Months PurchaseObligationDueInNextTwelveMonths	89557000	USD
CY2021Q4	us-gaap	Purchase Obligation Due In Second And Third Year PurchaseObligationDueInSecondAndThirdYear	82412000	USD
CY2021Q4	us-gaap	Purchase Obligation Due In Fourth And Fifth Year PurchaseObligationDueInFourthAndFifthYear	70114000	USD
CY2021Q4	us-gaap	Purchase Obligation Due After Fifth Year PurchaseObligationDueAfterFifthYear	174203000	USD
CY2021Q4	us-gaap	Purchase Obligation PurchaseObligation	416286000	USD
CY2021Q4	us-gaap	Guarantee Obligations Maximum Exposure GuaranteeObligationsMaximumExposure	20000000	USD
CY2021Q4	us-gaap	Guarantee Obligations Current Carrying Value GuaranteeObligationsCurrentCarryingValue	13100000	USD
CY2021	cpk	Standby Letters Of Credit StandbyLettersOfCredit	5300000	USD
CY2021	dei	Auditor Firm AuditorFirmId	23
CY2020Q4	cpk	Accounts Receivable Allowance For Credit Losses Current Disclosure AccountsReceivableAllowanceForCreditLossesCurrentDisclosure	4785000	USD
CY2021	us-gaap	Provision For Other Credit Losses ProvisionForOtherCreditLosses	134000	USD
CY2021	us-gaap	Allowance For Doubtful Accounts Receivable Recoveries AllowanceForDoubtfulAccountsReceivableRecoveries	-125000	USD
CY2021	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	1653000	USD
CY2021Q4	cpk	Accounts Receivable Allowance For Credit Losses Current Disclosure AccountsReceivableAllowanceForCreditLossesCurrentDisclosure	3141000	USD
CY2019Q4	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	1337000	USD
CY2020	us-gaap	Valuation Allowances And Reserves Charged To Cost And Expense ValuationAllowancesAndReservesChargedToCostAndExpense	3827000	USD
CY2020	us-gaap	Valuation Allowances And Reserves Charged To Other Accounts ValuationAllowancesAndReservesChargedToOtherAccounts	613000	USD
CY2020	us-gaap	Valuation Allowances And Reserves Deductions ValuationAllowancesAndReservesDeductions	992000	USD
CY2020Q4	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	4785000	USD
CY2018Q4	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	1058000	USD
CY2019	us-gaap	Valuation Allowances And Reserves Charged To Cost And Expense ValuationAllowancesAndReservesChargedToCostAndExpense	1392000	USD
CY2019	us-gaap	Valuation Allowances And Reserves Charged To Other Accounts ValuationAllowancesAndReservesChargedToOtherAccounts	278000	USD
CY2019	us-gaap	Valuation Allowances And Reserves Deductions ValuationAllowancesAndReservesDeductions	1391000	USD
CY2019Q4	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	1337000	USD

Files In Submission

Name	View Source	Status
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0001628280-22-003530-index.html	Edgar Link	pending
0001628280-22-003530.txt	Edgar Link	pending
0001628280-22-003530-xbrl.zip	Edgar Link	pending
cpk-20211231.htm	Edgar Link	pending
cpk-20211231.xsd	Edgar Link	pending
cpk-20211231_cal.xml	Edgar Link	unprocessable
cpk-20211231_def.xml	Edgar Link	unprocessable
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cpk-20211231_pre.xml	Edgar Link	unprocessable
cpk12312021ex-1018.htm	Edgar Link	pending
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$CPK
CHESAPEAKE UTILITIES CORP Stock $cpk

2021 Q4 Form 10-K Financial Statement

#000162828022003530 Filed on February 23, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CPK CHESAPEAKE UTILITIES CORP Stock $cpk

2021 Q4 Form 10-K Financial Statement

#000162828022003530 Filed on February 23, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CPK
CHESAPEAKE UTILITIES CORP Stock $cpk