$CPK
CHESAPEAKE UTILITIES CORP Stock $cpk

$cpk Overview Financials Valuation SEC Filings Company Website

2021 Q3 Form 10-Q Financial Statement

#000162828021021496 Filed on November 03, 2021

Income Statement

Concept	2021 Q3	2020 Q3	2020 Q2
Revenue	$107.3M	$101.4M	$97.05M
YoY Change	5.83%	9.49%	2.65%
Cost Of Revenue	$27.37M	$21.90M	$23.00M
YoY Change	24.96%	-13.44%	-8.73%
Gross Profit	$79.97M	$79.50M	$74.10M
YoY Change	0.59%	18.13%	6.93%
Gross Profit Margin	74.5%	78.39%	76.35%
Selling, General & Admin	$515.0K
YoY Change
% of Gross Profit	0.64%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$15.80M	$18.30M	$12.20M
YoY Change	-13.67%	61.95%	5.09%
% of Gross Profit	19.76%	23.02%	16.46%
Operating Expenses	$87.22M	$84.01M	$79.07M
YoY Change	3.82%	7.34%	3.53%
Operating Profit	$20.11M	$17.41M	$17.98M
YoY Change	15.55%	21.24%	-1.03%
Interest Expense	$4.975M	$4.584M	$5.054M
YoY Change	8.53%	-15.16%	-8.97%
% of Operating Profit	24.74%	26.34%	28.11%
Other Income/Expense, Net	$339.0K	-$40.00K	-$279.0K
YoY Change	-947.5%	-88.6%	-12.81%
Pretax Income	$15.48M	$12.78M	$12.64M
YoY Change	21.08%	48.58%	2.86%
Income Tax	$2.993M	$3.502M	$1.983M
% Of Pretax Income	19.34%	27.4%	15.68%
Net Earnings	$9.261M	$5.621M	$8.304M
YoY Change	64.76%	0.0%	0.0%
Net Earnings / Revenue	8.63%	5.54%	8.56%
Basic Earnings Per Share	$0.56	$0.34	$0.51
Diluted Earnings Per Share	$0.56	$0.34	$0.50
COMMON SHARES
Basic Shares Outstanding	17.58M shares	16.53M shares	16.45M shares
Diluted Shares Outstanding	17.66M shares	16.59M shares	16.50M shares

Balance Sheet

Concept	2021 Q3	2020 Q3	2020 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments	$5.886M	$3.100M	$3.600M
YoY Change	89.87%	-27.91%	-50.68%
Cash & Equivalents	$5.886M	$3.056M	$3.590M
Short-Term Investments
Other Short-Term Assets	$440.0K	$753.0K	$1.017M
YoY Change	-41.57%	-69.75%	-74.71%
Inventory	$18.30M	$12.70M	$11.30M
Prepaid Expenses	$15.56M	$14.82M	$9.167M
Receivables	$44.59M	$49.00M	$46.70M
Other Receivables	$12.70M	$15.20M	$9.800M
Total Short-Term Assets	$133.0M	$119.3M	$98.56M
YoY Change	11.46%	3.87%	-20.67%
LONG-TERM ASSETS
Property, Plant & Equipment	$1.700B	$1.567B	$1.525B
YoY Change	8.45%	7.28%	7.34%
Goodwill	$38.80M	$36.93M	$32.68M
YoY Change	5.07%	71.64%	26.76%
Intangibles	$7.298M	$7.215M	$7.520M
YoY Change	1.15%	120.51%	34.02%
Long-Term Investments	$11.49M	$9.700M	$9.600M
YoY Change	18.45%	14.12%	9.09%
Other Assets	$107.9M	$112.7M	$74.80M
YoY Change	-4.28%	33.85%	-2.73%
Total Long-Term Assets	$1.889B	$1.769B	$1.724B
YoY Change	6.79%	10.59%	10.72%
TOTAL ASSETS
Total Short-Term Assets	$133.0M	$119.3M	$98.56M
Total Long-Term Assets	$1.889B	$1.769B	$1.724B
Total Assets	$2.022B	$1.888B	$1.822B
YoY Change	7.08%	10.14%	8.4%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$53.03M	$46.49M	$46.38M
YoY Change	14.05%	-12.53%	-8.42%
Accrued Expenses	$41.73M	$34.70M	$32.40M
YoY Change	20.27%	13.77%	18.68%
Deferred Revenue	$874.0K	$971.0K	$347.0K
YoY Change	-9.99%	25.45%	9.81%
Short-Term Debt	$192.0M	$216.4M	$286.4M
YoY Change	-11.28%	-3.71%	-4.92%
Long-Term Debt Due	$16.21M	$15.60M	$15.60M
YoY Change	3.88%	-79.37%	-79.37%
Total Short-Term Liabilities	$354.5M	$360.0M	$429.8M
YoY Change	-1.51%	-19.33%	-16.12%
LONG-TERM LIABILITIES
Long-Term Debt	$505.5M	$520.0M	$430.1M
YoY Change	-2.79%	38.36%	55.88%
Other Long-Term Liabilities	$2.051M	$4.936M	$2.434M
YoY Change	-58.45%	63.5%	-8.53%
Total Long-Term Liabilities	$507.5M	$524.9M	$432.5M
YoY Change	-3.31%	38.56%	55.26%
TOTAL LIABILITIES
Total Short-Term Liabilities	$354.5M	$360.0M	$429.8M
Total Long-Term Liabilities	$507.5M	$524.9M	$432.5M
Total Liabilities	$862.1M	$884.9M	$862.4M
YoY Change	-2.58%	7.25%	9.02%
SHAREHOLDERS EQUITY
Retained Earnings	$378.9M	$328.4M	$326.5M
YoY Change	15.39%	15.34%	14.24%
Common Stock	$369.6M	$292.0M	$271.3M
YoY Change	26.6%	10.0%	2.62%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$7.186M	$5.634M	$5.659M
YoY Change	27.55%	25.06%	20.56%
Treasury Stock Shares
Shareholders Equity	$751.0M	$616.7M	$593.3M
YoY Change
Total Liabilities & Shareholders Equity	$2.022B	$1.888B	$1.822B
YoY Change	7.08%	10.14%	8.4%

Cashflow Statement

Concept	2021 Q3	2020 Q3	2020 Q2
OPERATING ACTIVITIES
Net Income	$9.261M	$5.621M	$8.304M
YoY Change	64.76%	0.0%	0.0%
Depreciation, Depletion And Amortization	$15.80M	$18.30M	$12.20M
YoY Change	-13.67%	61.95%	5.09%
Cash From Operating Activities	$18.57M	$24.20M	$32.90M
YoY Change	-23.27%	-17.41%	-3.52%
INVESTING ACTIVITIES
Capital Expenditures	-$43.58M	-$40.60M	-$47.60M
YoY Change	7.34%	-16.97%	0.85%
Acquisitions
YoY Change
Other Investing Activities	$35.00K	-$15.60M	-$1.200M
YoY Change	-100.22%	7700.0%	500.0%
Cash From Investing Activities	-$43.55M	-$56.30M	-$48.80M
YoY Change	-22.65%	14.9%	2.74%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	25.85M	31.50M	15.50M
YoY Change	-17.92%	88.62%	22.05%
NET CHANGE
Cash From Operating Activities	18.57M	24.20M	32.90M
Cash From Investing Activities	-43.55M	-56.30M	-48.80M
Cash From Financing Activities	25.85M	31.50M	15.50M
Net Change In Cash	875.0K	-600.0K	-400.0K
YoY Change	-245.83%	-80.0%	-42.86%
FREE CASH FLOW
Cash From Operating Activities	$18.57M	$24.20M	$32.90M
Capital Expenditures	-$43.58M	-$40.60M	-$47.60M
Free Cash Flow	$62.15M	$64.80M	$80.50M
YoY Change	-4.09%	-17.14%	-0.98%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
	dei	Entity Registrant Name EntityRegistrantName	CHESAPEAKE UTILITIES CORP
	dei	Trading Symbol TradingSymbol	CPK
	dei	Entity Central Index Key EntityCentralIndexKey	0000019745
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
	dei	Document Type DocumentType	10-Q
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2021
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q3
	dei	Amendment Flag AmendmentFlag	false
	dei	Entity Small Business EntitySmallBusiness	false
	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2021Q3	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	17604196	shares
	dei	Security Exchange Name SecurityExchangeName	NYSE
CY2021Q3	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	-5000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	-5000	USD
	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	-15000	USD
	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	-15000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax	-28000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax	-28000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax	-83000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax	-83000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	688000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	282000	USD
	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	1945000	USD
	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	935000	USD
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.285
CY2021Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.4800
CY2020Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	2000000	shares
CY2021Q3	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
CY2021Q3	cpk	Other Comprehensive Income Loss Unrealized Gain Losson Interest Rate Swaps During Period Tax OtherComprehensiveIncomeLossUnrealizedGainLossonInterestRateSwapsDuringPeriodTax	5000	USD
CY2020Q3	cpk	Other Comprehensive Income Loss Unrealized Gain Losson Interest Rate Swaps During Period Tax OtherComprehensiveIncomeLossUnrealizedGainLossonInterestRateSwapsDuringPeriodTax	10000	USD
	cpk	Other Comprehensive Income Loss Unrealized Gain Losson Interest Rate Swaps During Period Tax OtherComprehensiveIncomeLossUnrealizedGainLossonInterestRateSwapsDuringPeriodTax	6000	USD
	cpk	Other Comprehensive Income Loss Unrealized Gain Losson Interest Rate Swaps During Period Tax OtherComprehensiveIncomeLossUnrealizedGainLossonInterestRateSwapsDuringPeriodTax	-4000	USD
CY2021Q3	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	2980000	USD
CY2020Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	4785000	USD
CY2021Q3	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
CY2021Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	50000000	shares
CY2020Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	50000000	shares
CY2021Q3	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	2000000	shares
CY2021Q3	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2020Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2020Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.4400
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.400
CY2021Q3	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P1Y
CY2021Q3	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P1Y
CY2021Q3	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P1Y
CY2021Q3	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P1Y
CY2021Q3	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P1Y
CY2021Q3	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P1Y
CY2021Q3	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1
	cpk	Ratiosbasedonaverageofthepriorquarters Ratiosbasedonaverageofthepriorquarters	P1Y6M
	cpk	Maximum Days To Make Default Good MaximumDaysToMakeDefaultGood	P5D
	us-gaap	Notional Amount Of Nonderivative Instruments NotionalAmountOfNonderivativeInstruments	30000000	USD
	cpk	Notional Amount Nonderivative Instruments Total NotionalAmountNonderivativeInstrumentsTotal	60000000	USD
CY2021Q1	us-gaap	Notional Amount Of Nonderivative Instruments NotionalAmountOfNonderivativeInstruments	40000000	USD
	dei	Document Type DocumentType	10-Q
	dei	Document Quarterly Report DocumentQuarterlyReport	true
	dei	Document Period End Date DocumentPeriodEndDate	2021-09-30
	dei	Document Transition Report DocumentTransitionReport	false
	dei	Entity File Number EntityFileNumber	001-11590
	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	51-0064146
	dei	Entity Address Address Line1 EntityAddressAddressLine1	909 Silver Lake Boulevard
	dei	Entity Address City Or Town EntityAddressCityOrTown	Dover
	dei	Entity Address State Or Province EntityAddressStateOrProvince	DE
	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	19904
	dei	City Area Code CityAreaCode	302
	dei	Local Phone Number LocalPhoneNumber	734-6799
	dei	Security12b Title Security12bTitle	Common Stock - par value per share $0.4867
	dei	Trading Symbol TradingSymbol	CPK
	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
	dei	Entity Small Business EntitySmallBusiness	false
	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
	dei	Entity Shell Company EntityShellCompany	false
CY2020Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.4867
CY2021Q3	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	17604196	shares
CY2021Q3	us-gaap	Regulated Operating Revenue RegulatedOperatingRevenue	80396000	USD
CY2020Q3	us-gaap	Regulated Operating Revenue RegulatedOperatingRevenue	82762000	USD
	us-gaap	Regulated Operating Revenue RegulatedOperatingRevenue	282503000	USD
	us-gaap	Regulated Operating Revenue RegulatedOperatingRevenue	259235000	USD
CY2021Q3	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	26939000	USD
CY2020Q3	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	18657000	USD
	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	127101000	USD
	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	91925000	USD
CY2021Q3	us-gaap	Revenues Revenues	107335000	USD
CY2020Q3	us-gaap	Revenues Revenues	101419000	USD
	us-gaap	Revenues Revenues	409604000	USD
	us-gaap	Revenues Revenues	351160000	USD
CY2021Q3	cpk	Regulated Energy Cost Of Sales RegulatedEnergyCostOfSales	15294000	USD
CY2020Q3	cpk	Regulated Energy Cost Of Sales RegulatedEnergyCostOfSales	16271000	USD
	cpk	Regulated Energy Cost Of Sales RegulatedEnergyCostOfSales	72785000	USD
	cpk	Regulated Energy Cost Of Sales RegulatedEnergyCostOfSales	67490000	USD
CY2021Q3	cpk	Unregulated Energy And Other Cost Of Sales UnregulatedEnergyAndOtherCostOfSales	12072000	USD
CY2020Q3	cpk	Unregulated Energy And Other Cost Of Sales UnregulatedEnergyAndOtherCostOfSales	5640000	USD
	cpk	Unregulated Energy And Other Cost Of Sales UnregulatedEnergyAndOtherCostOfSales	55578000	USD
	cpk	Unregulated Energy And Other Cost Of Sales UnregulatedEnergyAndOtherCostOfSales	30250000	USD
CY2021Q3	cpk	Operations Operations	34075000	USD
CY2020Q3	cpk	Operations Operations	34959000	USD
	cpk	Operations Operations	109886000	USD
	cpk	Operations Operations	105516000	USD
CY2021Q3	us-gaap	Operating Costs And Expenses OperatingCostsAndExpenses	4267000	USD
CY2020Q3	us-gaap	Operating Costs And Expenses OperatingCostsAndExpenses	3717000	USD
	us-gaap	Operating Costs And Expenses OperatingCostsAndExpenses	12568000	USD
	us-gaap	Operating Costs And Expenses OperatingCostsAndExpenses	11695000	USD
	cpk	Settlement Gain SettlementGain	0	USD
	cpk	Settlement Gain SettlementGain	130000	USD
CY2021Q3	cpk	Depreciationand Amortization Costs DepreciationandAmortizationCosts	15798000	USD
CY2020Q3	cpk	Depreciationand Amortization Costs DepreciationandAmortizationCosts	18293000	USD
	cpk	Depreciationand Amortization Costs DepreciationandAmortizationCosts	46460000	USD
	cpk	Depreciationand Amortization Costs DepreciationandAmortizationCosts	42793000	USD
CY2021Q3	us-gaap	Taxes Other TaxesOther	5716000	USD
CY2020Q3	us-gaap	Taxes Other TaxesOther	5133000	USD
	us-gaap	Taxes Other TaxesOther	18039000	USD
	us-gaap	Taxes Other TaxesOther	16028000	USD
CY2021Q3	us-gaap	Operating Expenses OperatingExpenses	87222000	USD
CY2020Q3	us-gaap	Operating Expenses OperatingExpenses	84013000	USD
	us-gaap	Operating Expenses OperatingExpenses	315316000	USD
	us-gaap	Operating Expenses OperatingExpenses	273642000	USD
CY2021Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	20113000	USD
CY2020Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	17406000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	94288000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	77518000	USD
CY2021Q3	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	339000	USD
CY2020Q3	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-40000	USD
	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	2180000	USD
	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	2997000	USD
CY2021Q3	us-gaap	Interest Expense InterestExpense	4975000	USD
CY2020Q3	us-gaap	Interest Expense InterestExpense	4584000	USD
	us-gaap	Interest Expense InterestExpense	15134000	USD
	us-gaap	Interest Expense InterestExpense	15452000	USD
CY2021Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	15477000	USD
CY2020Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	12782000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	81334000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	65063000	USD
CY2021Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	2993000	USD
CY2020Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3502000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	20563000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	16082000	USD
CY2021Q3	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	12484000	USD
CY2020Q3	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	9280000	USD
	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	60771000	USD
	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	48981000	USD
CY2021Q3	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	-9000	USD
CY2020Q3	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	-19000	USD
	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	-17000	USD
	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	165000	USD
CY2021Q3	us-gaap	Net Income Loss NetIncomeLoss	12475000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	9261000	USD
	us-gaap	Net Income Loss NetIncomeLoss	60754000	USD
	us-gaap	Net Income Loss NetIncomeLoss	49146000	USD
CY2021Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	17582115	shares
CY2020Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16533748	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	17538461	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16466106	shares
CY2021Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	17659643	shares
CY2020Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	16592842	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	17610158	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	16523200	shares
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.46
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.98
CY2021Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.71
CY2020Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.56
	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	3.46
	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	2.97
CY2021Q3	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Basic Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare	0
CY2020Q3	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Basic Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare	0
	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Basic Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare	0
	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Basic Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare	0.01
CY2021Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.71
CY2020Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.56
CY2021Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.71
CY2020Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.56
	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	3.45
	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	2.96
CY2021Q3	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Diluted Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare	0
CY2020Q3	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Diluted Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare	0
	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Diluted Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare	0
	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Diluted Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare	0.01
CY2021Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.71
CY2020Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.56
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.45
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.97
CY2021Q3	us-gaap	Net Income Loss NetIncomeLoss	12475000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	9261000	USD
	us-gaap	Net Income Loss NetIncomeLoss	60754000	USD
	us-gaap	Net Income Loss NetIncomeLoss	49146000	USD
CY2021Q3	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	-14000	USD
CY2020Q3	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	-14000	USD
	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	-42000	USD
	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	-42000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	-78000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	-80000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	-234000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	-240000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	1803000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	740000	USD
	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	5094000	USD
	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	2450000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	14000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	27000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	18000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	-10000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	1881000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	833000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	5304000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	2638000	USD
CY2021Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	14356000	USD
CY2020Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	10094000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	66058000	USD
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	3499000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	51784000	USD
CY2021Q3	us-gaap	Public Utilities Property Plant And Equipment Plant In Service PublicUtilitiesPropertyPlantAndEquipmentPlantInService	1688938000	USD
CY2020Q4	us-gaap	Public Utilities Property Plant And Equipment Plant In Service PublicUtilitiesPropertyPlantAndEquipmentPlantInService	1577576000	USD
CY2021Q3	cpk	Unregulated Energy Property Plant And Equipment UnregulatedEnergyPropertyPlantAndEquipment	324083000	USD
CY2020Q4	cpk	Unregulated Energy Property Plant And Equipment UnregulatedEnergyPropertyPlantAndEquipment	300647000	USD
CY2021Q3	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	35183000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	30769000	USD
CY2021Q3	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	2048204000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	1908992000	USD
CY2021Q3	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	405263000	USD
CY2020Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	368743000	USD
CY2021Q3	cpk	Construction Workin Progress ConstructionWorkinProgress	56773000	USD
CY2020Q4	cpk	Construction Workin Progress ConstructionWorkinProgress	60929000	USD
CY2021Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1699714000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1601178000	USD
CY2021Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	5886000	USD
CY2021Q3	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	47570000	USD
CY2020Q4	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	61675000	USD
CY2021Q3	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	2980000	USD
CY2020Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	4785000	USD
CY2021Q3	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	44590000	USD
CY2020Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	56890000	USD
CY2021Q3	cpk	Accrued Revenue AccruedRevenue	11318000	USD
CY2020Q4	cpk	Accrued Revenue AccruedRevenue	21527000	USD
CY2021Q3	us-gaap	Energy Related Inventory Propane Gas EnergyRelatedInventoryPropaneGas	6917000	USD
CY2020Q4	us-gaap	Energy Related Inventory Propane Gas EnergyRelatedInventoryPropaneGas	5906000	USD
CY2021Q3	us-gaap	Other Inventory OtherInventory	6716000	USD
CY2020Q4	us-gaap	Other Inventory OtherInventory	5539000	USD
CY2021Q3	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	12021000	USD
CY2020Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	10786000	USD
CY2021Q3	us-gaap	Energy Related Inventory Natural Gas In Storage EnergyRelatedInventoryNaturalGasInStorage	4663000	USD
CY2020Q4	us-gaap	Energy Related Inventory Natural Gas In Storage EnergyRelatedInventoryNaturalGasInStorage	2455000	USD
CY2021Q3	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	12702000	USD
CY2020Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	12885000	USD
CY2021Q3	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	15555000	USD
CY2020Q4	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	13239000	USD
CY2021Q3	us-gaap	Energy Marketing Contracts Assets Current EnergyMarketingContractsAssetsCurrent	12185000	USD
CY2020Q4	us-gaap	Energy Marketing Contracts Assets Current EnergyMarketingContractsAssetsCurrent	3269000	USD
CY2020Q4	us-gaap	Energy Marketing Contracts Assets Current EnergyMarketingContractsAssetsCurrent	3269000	USD
CY2021Q3	us-gaap	Other Assets Current OtherAssetsCurrent	440000	USD
CY2020Q4	us-gaap	Other Assets Current OtherAssetsCurrent	436000	USD
CY2021Q3	us-gaap	Assets Current AssetsCurrent	132993000	USD
CY2020Q4	us-gaap	Assets Current AssetsCurrent	136431000	USD
CY2021Q3	us-gaap	Goodwill Goodwill	38803000	USD
CY2020Q4	us-gaap	Goodwill Goodwill	38731000	USD
CY2021Q3	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	7298000	USD
CY2020Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	8292000	USD
CY2021Q3	us-gaap	Investments Fair Value Disclosure InvestmentsFairValueDisclosure	11490000	USD
CY2020Q4	us-gaap	Investments Fair Value Disclosure InvestmentsFairValueDisclosure	10776000	USD
CY2020Q4	us-gaap	Common Stock Value CommonStockValue	8499000	USD
CY2021Q3	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	361066000	USD
CY2020Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	348482000	USD
CY2021Q3	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	9602000	USD
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	11194000	USD
CY2021Q3	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	107872000	USD
CY2020Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	113806000	USD
CY2021Q3	cpk	Receivables And Other Deferred Charges ReceivablesAndOtherDeferredCharges	14056000	USD
CY2020Q4	cpk	Receivables And Other Deferred Charges ReceivablesAndOtherDeferredCharges	12079000	USD
CY2021Q3	cpk	Deferred Charges And Other Assets DeferredChargesAndOtherAssets	189121000	USD
CY2020Q4	cpk	Deferred Charges And Other Assets DeferredChargesAndOtherAssets	194878000	USD
CY2021Q3	us-gaap	Assets Assets	2021828000	USD
CY2020Q4	us-gaap	Assets Assets	1932487000	USD
CY2021Q3	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2020Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2021Q3	us-gaap	Common Stock Value CommonStockValue	8560000	USD
CY2021Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	378897000	USD
CY2020Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	342969000	USD
CY2021Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	2439000	USD
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-2865000	USD
CY2021Q3	us-gaap	Compensation And Benefits Trust CompensationAndBenefitsTrust	7186000	USD
CY2020Q4	us-gaap	Compensation And Benefits Trust CompensationAndBenefitsTrust	5679000	USD
CY2021Q3	us-gaap	Treasury Stock Value TreasuryStockValue	7186000	USD
CY2020Q4	us-gaap	Treasury Stock Value TreasuryStockValue	5679000	USD
CY2021Q3	us-gaap	Stockholders Equity StockholdersEquity	750962000	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	697085000	USD
CY2021Q3	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	505459000	USD
CY2020Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	508499000	USD
CY2021Q3	us-gaap	Capitalization Longterm Debt And Equity CapitalizationLongtermDebtAndEquity	1256421000	USD
CY2020Q4	us-gaap	Capitalization Longterm Debt And Equity CapitalizationLongtermDebtAndEquity	1205584000	USD
CY2021Q3	us-gaap	Long Term Debt Current LongTermDebtCurrent	16206000	USD
CY2020Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	13600000	USD
CY2020Q4	us-gaap	Contract With Customer Refund Liability Current ContractWithCustomerRefundLiabilityCurrent	33302000	USD
CY2021Q3	us-gaap	Interest Payable Current InterestPayableCurrent	4783000	USD
CY2021Q3	us-gaap	Short Term Borrowings ShortTermBorrowings	192026000	USD
CY2020Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	175644000	USD
CY2021Q3	us-gaap	Accounts Payable Current AccountsPayableCurrent	53026000	USD
CY2020Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	60253000	USD
CY2021Q3	us-gaap	Contract With Customer Refund Liability Current ContractWithCustomerRefundLiabilityCurrent	35782000	USD
CY2020Q4	us-gaap	Interest Payable Current InterestPayableCurrent	2905000	USD
CY2021Q3	us-gaap	Dividends Payable Current DividendsPayableCurrent	8442000	USD
CY2020Q4	us-gaap	Dividends Payable Current DividendsPayableCurrent	7683000	USD
CY2021Q3	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	13497000	USD
CY2020Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	13994000	USD
CY2021Q3	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	5357000	USD
CY2020Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	6284000	USD
CY2021Q3	us-gaap	Energy Marketing Contract Liabilities Current EnergyMarketingContractLiabilitiesCurrent	1969000	USD
CY2020Q4	us-gaap	Energy Marketing Contract Liabilities Current EnergyMarketingContractLiabilitiesCurrent	127000	USD
CY2021Q3	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	23454000	USD
CY2020Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	15240000	USD
CY2021Q3	us-gaap	Liabilities Current LiabilitiesCurrent	354542000	USD
CY2020Q4	us-gaap	Liabilities Current LiabilitiesCurrent	329032000	USD
CY2021Q3	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	225448000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	205388000	USD
CY2021Q3	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	143164000	USD
CY2020Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	142736000	USD
CY2021Q3	us-gaap	Accrued Environmental Loss Contingencies Noncurrent AccruedEnvironmentalLossContingenciesNoncurrent	3709000	USD
CY2020Q4	us-gaap	Accrued Environmental Loss Contingencies Noncurrent AccruedEnvironmentalLossContingenciesNoncurrent	4299000	USD
CY2021Q3	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	28113000	USD
CY2020Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	30673000	USD
CY2021Q3	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	8380000	USD
CY2020Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	9872000	USD
CY2021Q3	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	2051000	USD
CY2020Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	4903000	USD
CY2021Q3	us-gaap	Deferred Credits And Other Liabilities DeferredCreditsAndOtherLiabilities	410865000	USD
CY2020Q4	us-gaap	Deferred Credits And Other Liabilities DeferredCreditsAndOtherLiabilities	397871000	USD
CY2021Q3	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2020Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2021Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	2021828000	USD
CY2020Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1932487000	USD
	us-gaap	Net Income Loss NetIncomeLoss	60754000	USD
	us-gaap	Net Income Loss NetIncomeLoss	49146000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	46460000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	42793000	USD
	cpk	Depreciation And Accretion Included In Other Costs DepreciationAndAccretionIncludedInOtherCosts	7668000	USD
	cpk	Depreciation And Accretion Included In Other Costs DepreciationAndAccretionIncludedInOtherCosts	7062000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	18059000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	22184000	USD
	cpk	Discontinued Operation Gain Lossfrom Disposalof Discontinued Operationbefore Income Tax Incremental DiscontinuedOperationGainLossfromDisposalofDiscontinuedOperationbeforeIncomeTaxIncremental	0	USD
	cpk	Discontinued Operation Gain Lossfrom Disposalof Discontinued Operationbefore Income Tax Incremental DiscontinuedOperationGainLossfromDisposalofDiscontinuedOperationbeforeIncomeTaxIncremental	200000	USD
	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	6255000	USD
	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	4876000	USD
	us-gaap	Unrealized Gain Loss On Commodity Contracts UnrealizedGainLossOnCommodityContracts	949000	USD
	us-gaap	Unrealized Gain Loss On Commodity Contracts UnrealizedGainLossOnCommodityContracts	432000	USD
	us-gaap	Employee Benefits And Share Based Compensation EmployeeBenefitsAndShareBasedCompensation	-519000	USD
	us-gaap	Employee Benefits And Share Based Compensation EmployeeBenefitsAndShareBasedCompensation	32000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	4620000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	3654000	USD
	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-22439000	USD
	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-10255000	USD
	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	4396000	USD
	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-2824000	USD
	us-gaap	Increase Decrease In Regulatory Assets And Liabilities IncreaseDecreaseInRegulatoryAssetsAndLiabilities	6562000	USD
	us-gaap	Increase Decrease In Regulatory Assets And Liabilities IncreaseDecreaseInRegulatoryAssetsAndLiabilities	2284000	USD
	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	6813000	USD
	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-1135000	USD
	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	18325000	USD
	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-924000	USD
	us-gaap	Increase Decrease In Income Taxes Receivable IncreaseDecreaseInIncomeTaxesReceivable	-183000	USD
	us-gaap	Increase Decrease In Income Taxes Receivable IncreaseDecreaseInIncomeTaxesReceivable	6809000	USD
	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	2480000	USD
	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	1572000	USD
	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	-740000	USD
	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	-5506000	USD
	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	1970000	USD
	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	3746000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	152784000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	115880000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	148213000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	123421000	USD
	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	727000	USD
	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	4320000	USD
	us-gaap	Payments To Acquire Businesses Gross PaymentsToAcquireBusinessesGross	0	USD
	us-gaap	Payments To Acquire Businesses Gross PaymentsToAcquireBusinessesGross	15629000	USD
	cpk	Proceedsfrom Divestitureof Businesses Incremental ProceedsfromDivestitureofBusinessesIncremental	0	USD
	cpk	Proceedsfrom Divestitureof Businesses Incremental ProceedsfromDivestitureofBusinessesIncremental	200000	USD
	cpk	Payments For Environmental Expenditures PaymentsForEnvironmentalExpenditures	590000	USD
	cpk	Payments For Environmental Expenditures PaymentsForEnvironmentalExpenditures	2021000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-148076000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-136551000	USD
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	23287000	USD
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	20044000	USD
	us-gaap	Proceeds From Issuance Or Sale Of Equity ProceedsFromIssuanceOrSaleOfEquity	7069000	USD
	us-gaap	Proceeds From Issuance Or Sale Of Equity ProceedsFromIssuanceOrSaleOfEquity	19731000	USD
	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	1478000	USD
	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	977000	USD
	us-gaap	Increase Decrease In Outstanding Checks Financing Activities IncreaseDecreaseInOutstandingChecksFinancingActivities	-508000	USD
	us-gaap	Increase Decrease In Outstanding Checks Financing Activities IncreaseDecreaseInOutstandingChecksFinancingActivities	-2310000	USD
	us-gaap	Proceeds From Repayments Of Lines Of Credit ProceedsFromRepaymentsOfLinesOfCredit	16392000	USD
	us-gaap	Proceeds From Repayments Of Lines Of Credit ProceedsFromRepaymentsOfLinesOfCredit	-29385000	USD
	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	-9590000	USD
	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	-89827000	USD
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	10099000	USD
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	40100000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-2321000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	16742000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	2387000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-3929000	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
CY2021Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	5886000	USD
CY2020Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	3056000	USD
CY2020Q2	us-gaap	Stockholders Equity StockholdersEquity	593277000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	9261000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	833000	USD
CY2020Q3	us-gaap	Dividends Dividends	7358000	USD
CY2020Q3	cpk	Stock Issued During The Period Value Retirement Savings Plan And Dividend Reinvestment Plan StockIssuedDuringThePeriodValueRetirementSavingsPlanAndDividendReinvestmentPlan	19533000	USD
CY2020Q3	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	1144000	USD
CY2020Q3	us-gaap	Stockholders Equity StockholdersEquity	616690000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	561577000	USD
	us-gaap	Shares Paid For Tax Withholding For Share Based Compensation SharesPaidForTaxWithholdingForShareBasedCompensation	10319	shares
	us-gaap	Shares Paid For Tax Withholding For Share Based Compensation SharesPaidForTaxWithholdingForShareBasedCompensation	14020	shares
CY2021Q3	cpk	Shares Held In Trust For Deferred Compensation Plan SharesHeldInTrustForDeferredCompensationPlan	114016	shares
CY2021Q3	us-gaap	Stockholders Equity StockholdersEquity	750962000	USD
CY2021Q3	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	2000000	shares
CY2021Q3	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	697085000	USD
	us-gaap	Net Income Loss NetIncomeLoss	60754000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	5304000	USD
	us-gaap	Dividends Dividends	24826000	USD
	cpk	Stock Issued During The Period Value Retirement Savings Plan And Dividend Reinvestment Plan StockIssuedDuringThePeriodValueRetirementSavingsPlanAndDividendReinvestmentPlan	9286000	USD
	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	3359000	USD
CY2020Q4	cpk	Shares Held In Trust For Deferred Compensation Plan SharesHeldInTrustForDeferredCompensationPlan	105087	shares
CY2020Q3	cpk	Shares Held In Trust For Deferred Compensation Plan SharesHeldInTrustForDeferredCompensationPlan	104119	shares
CY2019Q4	cpk	Shares Held In Trust For Deferred Compensation Plan SharesHeldInTrustForDeferredCompensationPlan	95329	shares
	us-gaap	Net Income Loss NetIncomeLoss	49146000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	2638000	USD
	us-gaap	Dividends Dividends	21366000	USD
	cpk	Stock Issued During The Period Value Retirement Savings Plan And Dividend Reinvestment Plan StockIssuedDuringThePeriodValueRetirementSavingsPlanAndDividendReinvestmentPlan	21819000	USD
	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	2906000	USD
	cpk	Treasury Stock Activity And Deferred Compensation Plan Activity During Period Value TreasuryStockActivityAndDeferredCompensationPlanActivityDuringPeriodValue	0	USD
	cpk	New Accounting Pronouncement Or Change In Accounting Principle Effect Of Adoption Quantification Principle Effect Of Adoption Quantification NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfAdoptionQuantificationPrincipleEffectOfAdoptionQuantification	-30000	USD
CY2020Q3	us-gaap	Stockholders Equity StockholdersEquity	616690000	USD
CY2021Q2	us-gaap	Stockholders Equity StockholdersEquity	741564000	USD
CY2021Q3	us-gaap	Net Income Loss NetIncomeLoss	12475000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	1881000	USD
CY2021Q3	us-gaap	Dividends Dividends	8514000	USD
CY2021Q3	cpk	Stock Issued During The Period Value Retirement Savings Plan And Dividend Reinvestment Plan StockIssuedDuringThePeriodValueRetirementSavingsPlanAndDividendReinvestmentPlan	2451000	USD
CY2021Q3	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	1105000	USD
CY2021Q3	cpk	Treasury Stock Activity And Deferred Compensation Plan Activity During Period Value TreasuryStockActivityAndDeferredCompensationPlanActivityDuringPeriodValue	0	USD
CY2021Q3	us-gaap	Stockholders Equity StockholdersEquity	750962000	USD
CY2021Q3	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	12484000	USD
CY2020Q3	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	9280000	USD
	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	60771000	USD
	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	48981000	USD
CY2021Q3	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	-9000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	9261000	USD
	us-gaap	Net Income Loss NetIncomeLoss	60754000	USD
CY2020Q3	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	-19000	USD
	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	-17000	USD
	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	165000	USD
CY2021Q3	us-gaap	Net Income Loss NetIncomeLoss	12475000	USD
	us-gaap	Net Income Loss NetIncomeLoss	49146000	USD
CY2021Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	17582115	shares
CY2020Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16533748	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	17538461	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16466106	shares
CY2021Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.71
CY2020Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.56
	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	3.46
	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	2.97
CY2021Q3	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Basic Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare	0
CY2020Q3	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Basic Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare	0
	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Basic Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare	0
	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Basic Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare	0.01
CY2021Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.71
CY2020Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.56
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.46
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.98
CY2021Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	17582115	shares
CY2020Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16533748	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	17538461	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16466106	shares
CY2021Q3	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	77528	shares
CY2020Q3	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	59094	shares
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	71697	shares
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	57094	shares
CY2021Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	17659643	shares
CY2020Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	16592842	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	17610158	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	16523200	shares
CY2021Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.71
CY2020Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.56
	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	3.45
	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	2.96
CY2021Q3	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Diluted Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare	0
CY2020Q3	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Diluted Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare	0
	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Diluted Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare	0
	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Diluted Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare	0.01
CY2021Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.71
CY2020Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.56
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.45
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.97
CY2021Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	107335000	USD
CY2020Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	101419000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	409604000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	351160000	USD
CY2020Q4	us-gaap	Receivables From Customers ReceivablesFromCustomers	55600000	USD
CY2020Q4	us-gaap	Contract With Customer Asset Net Current ContractWithCustomerAssetNetCurrent	18000	USD
CY2020Q4	us-gaap	Contract With Customer Asset Net Noncurrent ContractWithCustomerAssetNetNoncurrent	4816000	USD
CY2020Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	644000	USD
CY2021Q3	us-gaap	Receivables From Customers ReceivablesFromCustomers	40683000	USD
CY2021Q3	us-gaap	Contract With Customer Asset Net Current ContractWithCustomerAssetNetCurrent	18000	USD
CY2021Q3	us-gaap	Contract With Customer Asset Net Noncurrent ContractWithCustomerAssetNetNoncurrent	5011000	USD
CY2021Q3	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	874000	USD
	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	-14917000	USD
	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	0	USD
	us-gaap	Increase Decrease In Other Noncurrent Assets IncreaseDecreaseInOtherNoncurrentAssets	195000	USD
	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	230000	USD
CY2021Q3	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	200000	USD
	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	800000	USD
	cpk	Regulatory Asset Storm Cost Recovery RegulatoryAssetStormCostRecovery	45800000	USD
	cpk	Surcharge Storm Cost Recovery SurchargeStormCostRecovery	7700000	USD
	cpk	Incremental Revenue Storm Cost Recovery IncrementalRevenueStormCostRecovery	3300000	USD
CY2021Q3	cpk	Covid19 Regulatory Asset COVID19RegulatoryAsset	2300000	USD
CY2020Q4	cpk	Covid19 Regulatory Asset COVID19RegulatoryAsset	1900000	USD
	cpk	Companys Exposure In Number Of Former Manufactured Gas Plant Sites CompanysExposureInNumberOfFormerManufacturedGasPlantSites	7	site
CY2021Q3	cpk	Debt Service Coverage Ratio DebtServiceCoverageRatio	1.25
CY2021Q3	cpk	Debt Service Coverage Ratio Measurement Period DebtServiceCoverageRatioMeasurementPeriod	12
	cpk	Ratiobasedonaveragenumberofpriorquarters Ratiobasedonaveragenumberofpriorquarters	6
CY2021Q3	cpk	Minimum Interest Coverage Ratio Under Agreement Two MinimumInterestCoverageRatioUnderAgreementTwo	2
CY2021Q3	cpk	Maximum Debt To Net Capital Ratio Under Agreement Two MaximumDebtToNetCapitalRatioUnderAgreementTwo	0.65
	cpk	Number Of Years For Power Purchase Agreement NumberOfYearsForPowerPurchaseAgreement	P20Y
	cpk	Contract Duration ContractDuration	P20Y
CY2021Q3	us-gaap	Guarantee Obligations Maximum Exposure GuaranteeObligationsMaximumExposure	20000000	USD
CY2021Q3	us-gaap	Guarantee Obligations Current Carrying Value GuaranteeObligationsCurrentCarryingValue	8000000	USD
	cpk	Standby Letters Of Credit StandbyLettersOfCredit	4600000	USD
	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	2
CY2021Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	20113000	USD
CY2020Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	17406000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	94288000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	77518000	USD
CY2021Q3	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	339000	USD
CY2020Q3	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-40000	USD
	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	2180000	USD
	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	2997000	USD
CY2021Q3	us-gaap	Interest Expense InterestExpense	4975000	USD
CY2020Q3	us-gaap	Interest Expense InterestExpense	4584000	USD
	us-gaap	Interest Expense InterestExpense	15134000	USD
	us-gaap	Interest Expense InterestExpense	15452000	USD
CY2021Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	15477000	USD
CY2020Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	12782000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	81334000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	65063000	USD
CY2021Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	2993000	USD
CY2020Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3502000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	20563000	USD
CY2021Q1	us-gaap	Stock Issued During Period Shares Dividend Reinvestment Plan StockIssuedDuringPeriodSharesDividendReinvestmentPlan	300000	shares
	us-gaap	Net Income Loss NetIncomeLoss	49146000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	16082000	USD
CY2021Q3	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	-9000	USD
CY2020Q3	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	-19000	USD
	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	-17000	USD
	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	165000	USD
CY2021Q3	us-gaap	Net Income Loss NetIncomeLoss	12475000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	9261000	USD
	us-gaap	Net Income Loss NetIncomeLoss	60754000	USD
CY2021Q3	us-gaap	Assets Assets	2021828000	USD
CY2020Q4	us-gaap	Assets Assets	1932487000	USD
CY2020Q4	cpk	Common Stock Shares Issued At The Market CommonStockSharesIssuedAtTheMarket	700000	shares
CY2020Q4	cpk	Shares Issued Price Per Share At The Market SharesIssuedPricePerShareAtTheMarket	82.93
	cpk	Proceeds From Issuance Of Common Stock At The Market ProceedsFromIssuanceOfCommonStockAtTheMarket	61000000	USD
	cpk	Fees On Equity Issuance At The Market FeesOnEquityIssuanceAtTheMarket	1500000	USD
CY2021Q1	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	86.12	USD
CY2021Q1	us-gaap	Proceeds From Issuance Of Common Stock Dividend Reinvestment Plan ProceedsFromIssuanceOfCommonStockDividendReinvestmentPlan	22000000	USD
	us-gaap	Stock Issued During Period Shares Dividend Reinvestment Plan StockIssuedDuringPeriodSharesDividendReinvestmentPlan	100000	shares
	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	116.63	USD
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-2865000	USD
	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	8176000	USD
	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	2872000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	5304000	USD
CY2021Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	2439000	USD
	us-gaap	Proceeds From Issuance Of Common Stock Dividend Reinvestment Plan ProceedsFromIssuanceOfCommonStockDividendReinvestmentPlan	6600000	USD
CY2021Q4	us-gaap	Stock Issued During Period Shares Dividend Reinvestment Plan StockIssuedDuringPeriodSharesDividendReinvestmentPlan	100000	shares
CY2021Q4	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	127.40	USD
CY2021Q4	us-gaap	Proceeds From Issuance Of Common Stock Dividend Reinvestment Plan ProceedsFromIssuanceOfCommonStockDividendReinvestmentPlan	1800000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-6267000	USD
	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	3617000	USD
	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	979000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	2638000	USD
CY2020Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-3629000	USD
CY2020Q3	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	-217000	USD
CY2020Q3	cpk	Defined Benefit Plan Amounts Recognized Gain Loss DefinedBenefitPlanAmountsRecognizedGainLoss	198000	USD
CY2021Q3	us-gaap	Defined Benefit Plan Amortization Of Prior Service Cost Credit DefinedBenefitPlanAmortizationOfPriorServiceCostCredit	-19000	USD
CY2021Q3	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	-230000	USD
CY2021Q3	cpk	Defined Benefit Plan Amounts Recognized Gain Loss DefinedBenefitPlanAmountsRecognizedGainLoss	211000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	87000	USD
CY2021Q3	cpk	Defined Benefit Plan Amounts Recognized From Regulatory Asset DefinedBenefitPlanAmountsRecognizedFromRegulatoryAsset	124000	USD
CY2021Q3	cpk	Defined Benefit Plan Amounts Recognized Gain Loss DefinedBenefitPlanAmountsRecognizedGainLoss	211000	USD
CY2020Q3	us-gaap	Defined Benefit Plan Amortization Of Prior Service Cost Credit DefinedBenefitPlanAmortizationOfPriorServiceCostCredit	-19000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	89000	USD
CY2020Q3	cpk	Defined Benefit Plan Amounts Recognized From Regulatory Asset DefinedBenefitPlanAmountsRecognizedFromRegulatoryAsset	109000	USD
CY2020Q3	cpk	Defined Benefit Plan Actuarial Gain Loss Net Settlement DefinedBenefitPlanActuarialGainLossNetSettlement	198000	USD
	us-gaap	Defined Benefit Plan Amortization Of Prior Service Cost Credit DefinedBenefitPlanAmortizationOfPriorServiceCostCredit	-57000	USD
	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	-690000	USD
	cpk	Defined Benefit Plan Amounts Recognized Gain Loss DefinedBenefitPlanAmountsRecognizedGainLoss	633000	USD
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	260000	USD
	cpk	Defined Benefit Plan Amounts Recognized From Regulatory Asset DefinedBenefitPlanAmountsRecognizedFromRegulatoryAsset	373000	USD
	cpk	Defined Benefit Plan Amounts Recognized Gain Loss DefinedBenefitPlanAmountsRecognizedGainLoss	633000	USD
	us-gaap	Defined Benefit Plan Amortization Of Prior Service Cost Credit DefinedBenefitPlanAmortizationOfPriorServiceCostCredit	-57000	USD
	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	-651000	USD
	cpk	Defined Benefit Plan Amounts Recognized Gain Loss DefinedBenefitPlanAmountsRecognizedGainLoss	594000	USD
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	267000	USD
	cpk	Defined Benefit Plan Amounts Recognized From Regulatory Asset DefinedBenefitPlanAmountsRecognizedFromRegulatoryAsset	327000	USD
	cpk	Defined Benefit Plan Actuarial Gain Loss Net Settlement DefinedBenefitPlanActuarialGainLossNetSettlement	594000	USD
	us-gaap	Trading Securities Unrealized Holding Gain Loss TradingSecuritiesUnrealizedHoldingGainLoss	400000	USD
CY2021Q3	us-gaap	Investments Fair Value Disclosure InvestmentsFairValueDisclosure	11490000	USD
CY2020Q4	us-gaap	Investments Fair Value Disclosure InvestmentsFairValueDisclosure	10776000	USD
CY2020Q3	us-gaap	Trading Securities Unrealized Holding Gain Loss TradingSecuritiesUnrealizedHoldingGainLoss	600000	USD
	us-gaap	Trading Securities Unrealized Holding Gain Loss TradingSecuritiesUnrealizedHoldingGainLoss	1000000	USD
CY2021Q3	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	1306000	USD
CY2020Q3	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	1332000	USD
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	4620000	USD
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	3654000	USD
CY2021Q3	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	339000	USD
CY2020Q3	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	348000	USD
	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	1200000	USD
	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	955000	USD
CY2021Q3	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	967000	USD
CY2020Q3	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	984000	USD
	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	3420000	USD
	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	2699000	USD
CY2021Q3	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	5600000	USD
	us-gaap	Notional Amount Of Nonderivative Instruments NotionalAmountOfNonderivativeInstruments	30000000	USD
	cpk	Notional Amount Nonderivative Instruments Total NotionalAmountNonderivativeInstrumentsTotal	60000000	USD
CY2021Q1	us-gaap	Notional Amount Of Nonderivative Instruments NotionalAmountOfNonderivativeInstruments	40000000	USD
CY2021Q3	us-gaap	Energy Marketing Contracts Assets Current EnergyMarketingContractsAssetsCurrent	12185000	USD
CY2020Q4	us-gaap	Energy Marketing Contracts Assets Current EnergyMarketingContractsAssetsCurrent	3269000	USD
CY2021Q3	us-gaap	Energy Marketing Contract Liabilities Current EnergyMarketingContractLiabilitiesCurrent	1969000	USD
CY2020Q4	us-gaap	Energy Marketing Contract Liabilities Current EnergyMarketingContractLiabilitiesCurrent	127000	USD
CY2021Q3	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	3215000	USD
CY2020Q3	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	1209000	USD
	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	11272000	USD
	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	4997000	USD
CY2021Q3	us-gaap	Energy Marketing Contracts Assets Current EnergyMarketingContractsAssetsCurrent	12185000	USD
CY2021Q3	us-gaap	Energy Marketing Contracts Assets Current EnergyMarketingContractsAssetsCurrent	12185000	USD
CY2021Q3	us-gaap	Energy Marketing Contract Liabilities Current EnergyMarketingContractLiabilitiesCurrent	1969000	USD
CY2021Q3	us-gaap	Energy Marketing Contract Liabilities Current EnergyMarketingContractLiabilitiesCurrent	1969000	USD
CY2020Q4	us-gaap	Energy Marketing Contracts Assets Current EnergyMarketingContractsAssetsCurrent	3269000	USD
CY2020Q4	us-gaap	Energy Marketing Contracts Assets Current EnergyMarketingContractsAssetsCurrent	3269000	USD
CY2020Q4	us-gaap	Energy Marketing Contract Liabilities Current EnergyMarketingContractLiabilitiesCurrent	127000	USD
CY2020Q4	us-gaap	Long Term Debt LongTermDebt	523000000	USD
CY2020Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	548500000	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
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases Sales Issuances Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements	77000	USD
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases Sales Issuances Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements	243000	USD
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Out Of Level3 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3	0	USD
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Out Of Level3 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3	1579000	USD
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Sales FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales	241000	USD
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Sales FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales	514000	USD
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings1 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1	-24000	USD
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings1 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1	-18000	USD
CY2021Q3	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	2016000	USD
CY2020Q3	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	2129000	USD
CY2021Q3	us-gaap	Long Term Debt LongTermDebt	522500000	USD
CY2021Q3	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	561900000	USD
CY2021Q3	us-gaap	Short Term Borrowings ShortTermBorrowings	192000000	USD
CY2021Q3	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	505459000	USD
CY2020Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	175600000	USD
CY2021Q3	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	825000	USD
CY2020Q4	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	901000	USD
CY2021Q3	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	521665000	USD
CY2020Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	522099000	USD
CY2021Q3	us-gaap	Long Term Debt Current LongTermDebtCurrent	16206000	USD
CY2020Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	13600000	USD
CY2020Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	508499000	USD
CY2021Q3	us-gaap	Debt Instrument Unused Borrowing Capacity Amount DebtInstrumentUnusedBorrowingCapacityAmount	310000000	USD
CY2021Q3	us-gaap	Short Term Debt Weighted Average Interest Rate ShortTermDebtWeightedAverageInterestRate	0.0082
CY2020Q4	us-gaap	Short Term Debt Weighted Average Interest Rate ShortTermDebtWeightedAverageInterestRate	0.0128
CY2021Q3	us-gaap	Notional Amount Of Nonderivative Instruments NotionalAmountOfNonderivativeInstruments	70000000	USD
CY2021Q3	us-gaap	Financing Receivable Revolving FinancingReceivableRevolving	400000000	USD
CY2021Q3	us-gaap	Ratio Of Indebtedness To Net Capital1 RatioOfIndebtednessToNetCapital1	0.65
CY2021Q3	us-gaap	Line Of Credit Facility Remaining Borrowing Capacity LineOfCreditFacilityRemainingBorrowingCapacity	203400000	USD
	cpk	Standby Letters Of Credit StandbyLettersOfCredit	4600000	USD
	us-gaap	Notional Amount Of Nonderivative Instruments NotionalAmountOfNonderivativeInstruments	30000000	USD
	cpk	Notional Amount Nonderivative Instruments Total NotionalAmountNonderivativeInstrumentsTotal	60000000	USD
CY2021Q1	us-gaap	Notional Amount Of Nonderivative Instruments NotionalAmountOfNonderivativeInstruments	40000000	USD
CY2021Q3	us-gaap	Operating Lease Cost OperatingLeaseCost	515000	USD
CY2020Q3	us-gaap	Operating Lease Cost OperatingLeaseCost	627000	USD
	us-gaap	Operating Lease Cost OperatingLeaseCost	1553000	USD
	us-gaap	Operating Lease Cost OperatingLeaseCost	1882000	USD
CY2021Q3	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	9602000	USD
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	11194000	USD
CY2021Q3	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	1725000	USD
CY2020Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	1747000	USD
CY2021Q3	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	8380000	USD
CY2020Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	9872000	USD
CY2021Q3	cpk	Total Operatingand Finance Lease Liabilities TotalOperatingandFinanceLeaseLiabilities	10105000	USD
CY2020Q4	cpk	Total Operatingand Finance Lease Liabilities TotalOperatingandFinanceLeaseLiabilities	11619000	USD
CY2021Q3	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P8Y6M14D
CY2020Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P8Y8M12D
CY2021Q3	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.038
CY2020Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.038
	us-gaap	Operating Lease Payments OperatingLeasePayments	1399000	USD
	us-gaap	Operating Lease Payments OperatingLeasePayments	1435000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Remainder Of Fiscal Year LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear	597000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	1845000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	1762000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	1607000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	1387000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	951000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	3596000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	11745000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	-1640000	USD
CY2021Q3	us-gaap	Operating Lease Liability OperatingLeaseLiability	10105000	USD
CY2021Q3	cpk	Lessee Future Operating Lease Option Payments LesseeFutureOperatingLeaseOptionPayments	2100000	USD

Files In Submission

Name	View Source	Status
R40.htm	Edgar Link	pending
0001628280-21-021496-index-headers.html	Edgar Link	pending
0001628280-21-021496-index.html	Edgar Link	pending
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0001628280-21-021496-xbrl.zip	Edgar Link	pending
cpk-20210930.htm	Edgar Link	pending
cpk-20210930.xsd	Edgar Link	pending
cpk-20210930_cal.xml	Edgar Link	unprocessable
cpk-20210930_def.xml	Edgar Link	unprocessable
cpk-20210930_htm.xml	Edgar Link	completed
cpk-20210930_lab.xml	Edgar Link	unprocessable
cpk-20210930_pre.xml	Edgar Link	unprocessable
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cpk09302021ex-311.htm	Edgar Link	pending
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$CPK
CHESAPEAKE UTILITIES CORP Stock $cpk

2021 Q3 Form 10-Q Financial Statement

#000162828021021496 Filed on November 03, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CPK CHESAPEAKE UTILITIES CORP Stock $cpk

2021 Q3 Form 10-Q Financial Statement

#000162828021021496 Filed on November 03, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CPK
CHESAPEAKE UTILITIES CORP Stock $cpk