$CPK
CHESAPEAKE UTILITIES CORP Stock $cpk

$cpk Overview Financials Valuation SEC Filings Company Website

2021 Q2 Form 10-Q Financial Statement

#000162828021015580 Filed on August 04, 2021

Income Statement

Concept	2021 Q2	2020 Q2	2020 Q1
Revenue	$111.1M	$97.05M	$152.7M
YoY Change	14.46%	2.65%	-4.84%
Cost Of Revenue	$26.70M	$23.00M	$52.90M
YoY Change	16.09%	-8.73%	-13.14%
Gross Profit	$84.38M	$74.10M	$99.80M
YoY Change	13.87%	6.93%	0.2%
Gross Profit Margin	75.96%	76.35%	65.36%
Selling, General & Admin	$515.0K
YoY Change
% of Gross Profit	0.61%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$15.26M	$12.20M	$12.25M
YoY Change	25.1%	5.09%	10.64%
% of Gross Profit	18.09%	16.46%	12.28%
Operating Expenses	$88.50M	$79.07M	$110.6M
YoY Change	11.93%	3.53%	-39.79%
Operating Profit	$22.58M	$17.98M	$42.13M
YoY Change	25.59%	-1.03%	-4.51%
Interest Expense	$5.054M	$5.054M	$5.814M
YoY Change	0.0%	-8.97%	3.3%
% of Operating Profit	22.38%	28.11%	13.8%
Other Income/Expense, Net	$1.453M	-$279.0K	$3.319M
YoY Change	-620.79%	-12.81%	-5922.81%
Pretax Income	$18.98M	$12.64M	$39.64M
YoY Change	50.09%	2.86%	3.12%
Income Tax	$5.164M	$1.983M	$10.60M
% Of Pretax Income	27.21%	15.68%	26.74%
Net Earnings	$13.81M	$8.304M	$28.66M
YoY Change	66.34%	0.0%	0.0%
Net Earnings / Revenue	12.43%	8.56%	18.77%
Basic Earnings Per Share	$0.79	$0.51	$1.75
Diluted Earnings Per Share	$0.78	$0.50	$1.74
COMMON SHARES
Basic Shares Outstanding	17.55M shares	16.45M shares	16.41M shares
Diluted Shares Outstanding	17.62M shares	16.50M shares	16.47M shares

Balance Sheet

Concept	2021 Q2	2020 Q2	2020 Q1
SHORT-TERM ASSETS
Cash & Short-Term Investments	$5.011M	$3.600M	$4.000M
YoY Change	39.19%	-50.68%	-50.0%
Cash & Equivalents	$5.011M	$3.590M	$3.982M
Short-Term Investments
Other Short-Term Assets	$523.0K	$1.017M	$3.666M
YoY Change	-48.57%	-74.71%	227.03%
Inventory	$14.99M	$11.30M	$11.50M
Prepaid Expenses	$9.497M	$9.167M	$10.71M
Receivables	$41.31M	$46.70M	$45.31M
Other Receivables	$8.371M	$9.800M	$15.30M
Total Short-Term Assets	$110.6M	$98.56M	$111.9M
YoY Change	12.17%	-20.67%	-27.15%
LONG-TERM ASSETS
Property, Plant & Equipment	$1.673B	$1.525B	$1.492B
YoY Change	9.67%	7.34%	6.92%
Goodwill	$38.80M	$32.68M	$32.67M
YoY Change	18.72%	26.76%	26.69%
Intangibles	$7.625M	$7.520M	$7.824M
YoY Change	1.4%	34.02%	32.41%
Long-Term Investments	$11.75M	$9.600M	$7.200M
YoY Change	22.34%	9.09%	-4.0%
Other Assets	$109.2M	$74.80M	$73.60M
YoY Change	46.05%	-2.73%	-4.54%
Total Long-Term Assets	$1.862B	$1.724B	$1.676B
YoY Change	8.02%	10.72%	9.62%
TOTAL ASSETS
Total Short-Term Assets	$110.6M	$98.56M	$111.9M
Total Long-Term Assets	$1.862B	$1.724B	$1.676B
Total Assets	$1.972B	$1.822B	$1.788B
YoY Change	8.24%	8.4%	6.26%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$49.41M	$46.38M	$52.57M
YoY Change	6.52%	-8.42%	-30.17%
Accrued Expenses	$33.28M	$32.40M	$28.70M
YoY Change	2.7%	18.68%	3.61%
Deferred Revenue	$342.0K	$347.0K	$428.0K
YoY Change	-1.44%	9.81%	40.33%
Short-Term Debt	$169.3M	$286.4M	$254.3M
YoY Change	-40.89%	-4.92%	-7.98%
Long-Term Debt Due	$13.60M	$15.60M	$15.60M
YoY Change	-12.82%	-79.37%	-78.18%
Total Short-Term Liabilities	$322.3M	$429.8M	$402.5M
YoY Change	-25.03%	-16.12%	-20.86%
LONG-TERM LIABILITIES
Long-Term Debt	$498.5M	$430.1M	$440.2M
YoY Change	15.89%	55.88%	53.91%
Other Long-Term Liabilities	$4.813M	$2.434M	$2.699M
YoY Change	97.74%	-8.53%	-7.19%
Total Long-Term Liabilities	$503.3M	$432.5M	$442.9M
YoY Change	16.35%	55.26%	53.3%
TOTAL LIABILITIES
Total Short-Term Liabilities	$322.3M	$429.8M	$402.5M
Total Long-Term Liabilities	$503.3M	$432.5M	$442.9M
Total Liabilities	$825.5M	$862.4M	$845.4M
YoY Change	-4.27%	9.02%	6.01%
SHAREHOLDERS EQUITY
Retained Earnings	$374.9M	$326.5M	$322.8M
YoY Change	14.85%	14.24%	13.62%
Common Stock	$366.1M	$271.3M	$267.5M
YoY Change	34.94%	2.62%	1.61%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$7.203M	$5.659M	$5.468M
YoY Change	27.28%	20.56%	24.95%
Treasury Stock Shares
Shareholders Equity	$741.6M	$593.3M	$584.1M
YoY Change
Total Liabilities & Shareholders Equity	$1.972B	$1.822B	$1.788B
YoY Change	8.24%	8.4%	6.26%

Cashflow Statement

Concept	2021 Q2	2020 Q2	2020 Q1
OPERATING ACTIVITIES
Net Income	$13.81M	$8.304M	$28.66M
YoY Change	66.34%	0.0%	0.0%
Depreciation, Depletion And Amortization	$15.26M	$12.20M	$12.25M
YoY Change	25.1%	5.09%	10.64%
Cash From Operating Activities	$53.82M	$32.90M	$58.81M
YoY Change	63.57%	-3.52%	45.26%
INVESTING ACTIVITIES
Capital Expenditures	-$52.63M	-$47.60M	$35.18M
YoY Change	10.57%	0.85%	-18.59%
Acquisitions
YoY Change
Other Investing Activities	$2.000K	-$1.200M	$3.700M
YoY Change	-100.17%	500.0%	-1950.0%
Cash From Investing Activities	-$52.73M	-$48.80M	-$31.50M
YoY Change	8.05%	2.74%	-27.37%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net			$30.00M
YoY Change			7146.38%
Cash From Financing Activities	-1.675M	15.50M	-$30.31M
YoY Change	-110.81%	22.05%	-735.63%
NET CHANGE
Cash From Operating Activities	53.82M	32.90M	$58.81M
Cash From Investing Activities	-52.73M	-48.80M	-$31.50M
Cash From Financing Activities	-1.675M	15.50M	-$30.31M
Net Change In Cash	-588.0K	-400.0K	-$3.003M
YoY Change	47.0%	-42.86%	-259.23%
FREE CASH FLOW
Cash From Operating Activities	$53.82M	$32.90M	$58.81M
Capital Expenditures	-$52.63M	-$47.60M	$35.18M
Free Cash Flow	$106.4M	$80.50M	$23.63M
YoY Change	32.23%	-0.98%	-965.42%

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	Q2
	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	17578367	shares
	dei	Security Exchange Name SecurityExchangeName	NYSE
CY2021Q2	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
CY2020Q2	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	-10000	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	-10000	USD
CY2021Q2	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax	-28000	USD
CY2020Q2	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	-53000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax	-55000	USD
CY2021Q2	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	1193000	USD
CY2020Q2	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	651000	USD
	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	1257000	USD
	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	653000	USD
CY2021Q2	cpk	Other Comprehensive Income Loss Unrealized Gain Losson Interest Rate Swaps During Period Tax OtherComprehensiveIncomeLossUnrealizedGainLossonInterestRateSwapsDuringPeriodTax	2000	USD
CY2020Q2	cpk	Other Comprehensive Income Loss Unrealized Gain Losson Interest Rate Swaps During Period Tax OtherComprehensiveIncomeLossUnrealizedGainLossonInterestRateSwapsDuringPeriodTax	-14000	USD
	cpk	Other Comprehensive Income Loss Unrealized Gain Losson Interest Rate Swaps During Period Tax OtherComprehensiveIncomeLossUnrealizedGainLossonInterestRateSwapsDuringPeriodTax	1000	USD
	cpk	Other Comprehensive Income Loss Unrealized Gain Losson Interest Rate Swaps During Period Tax OtherComprehensiveIncomeLossUnrealizedGainLossonInterestRateSwapsDuringPeriodTax	-14000	USD
CY2021Q2	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	3895000	USD
CY2020Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	4785000	USD
CY2021Q2	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
CY2021Q2	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	50000000	shares
CY2020Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	50000000	shares
CY2021Q2	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	2000000	shares
CY2020Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	2000000	shares
CY2021Q2	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
CY2021Q2	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2020Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2020Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.4400
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.845
CY2021Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.4800
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.92
	dei	Document Period End Date DocumentPeriodEndDate	2021-06-30
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 Transition Report DocumentTransitionReport	false
	dei	Entity File Number EntityFileNumber	001-11590
CY2021Q2	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P1Y
CY2021Q2	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P1Y
CY2021Q2	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P1Y
CY2021Q2	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P1Y
CY2021Q2	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P1Y
CY2021Q2	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P1Y
CY2021Q2	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
CY2020	us-gaap	Notional Amount Of Nonderivative Instruments NotionalAmountOfNonderivativeInstruments	60000000	USD
	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2020Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.4867
	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
CY2021Q3	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	17578367	shares
CY2021Q2	us-gaap	Regulated Operating Revenue RegulatedOperatingRevenue	80910000	USD
CY2020Q2	cpk	Unregulated Energy And Other Cost Of Sales UnregulatedEnergyAndOtherCostOfSales	6575000	USD
CY2020Q2	us-gaap	Regulated Operating Revenue RegulatedOperatingRevenue	73518000	USD
	us-gaap	Regulated Operating Revenue RegulatedOperatingRevenue	202107000	USD
	us-gaap	Regulated Operating Revenue RegulatedOperatingRevenue	176473000	USD
CY2021Q2	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	30172000	USD
CY2020Q2	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	23533000	USD
	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	100161000	USD
	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	73268000	USD
CY2021Q2	us-gaap	Revenues Revenues	111082000	USD
CY2020Q2	us-gaap	Revenues Revenues	97051000	USD
	us-gaap	Revenues Revenues	302268000	USD
	us-gaap	Revenues Revenues	249741000	USD
CY2021Q2	cpk	Regulated Energy Cost Of Sales RegulatedEnergyCostOfSales	14447000	USD
CY2020Q2	cpk	Regulated Energy Cost Of Sales RegulatedEnergyCostOfSales	16387000	USD
	cpk	Regulated Energy Cost Of Sales RegulatedEnergyCostOfSales	57491000	USD
	cpk	Regulated Energy Cost Of Sales RegulatedEnergyCostOfSales	51219000	USD
CY2021Q2	cpk	Unregulated Energy And Other Cost Of Sales UnregulatedEnergyAndOtherCostOfSales	12254000	USD
	cpk	Unregulated Energy And Other Cost Of Sales UnregulatedEnergyAndOtherCostOfSales	43506000	USD
	cpk	Unregulated Energy And Other Cost Of Sales UnregulatedEnergyAndOtherCostOfSales	24611000	USD
CY2021Q2	cpk	Operations Operations	36371000	USD
CY2020Q2	cpk	Operations Operations	34605000	USD
	cpk	Operations Operations	75810000	USD
	cpk	Operations Operations	70557000	USD
CY2021Q2	us-gaap	Operating Costs And Expenses OperatingCostsAndExpenses	4259000	USD
CY2020Q2	us-gaap	Operating Costs And Expenses OperatingCostsAndExpenses	4143000	USD
	us-gaap	Operating Costs And Expenses OperatingCostsAndExpenses	8300000	USD
	us-gaap	Operating Costs And Expenses OperatingCostsAndExpenses	7979000	USD
	cpk	Settlement Gain SettlementGain	130000	USD
	cpk	Settlement Gain SettlementGain	130000	USD
CY2021Q2	cpk	Depreciationand Amortization Costs DepreciationandAmortizationCosts	15298000	USD
CY2020Q2	cpk	Depreciationand Amortization Costs DepreciationandAmortizationCosts	12247000	USD
	cpk	Depreciationand Amortization Costs DepreciationandAmortizationCosts	30662000	USD
	cpk	Depreciationand Amortization Costs DepreciationandAmortizationCosts	24500000	USD
CY2021Q2	us-gaap	Taxes Other TaxesOther	5875000	USD
CY2020Q2	us-gaap	Taxes Other TaxesOther	5247000	USD
	us-gaap	Taxes Other TaxesOther	12324000	USD
	us-gaap	Taxes Other TaxesOther	10894000	USD
CY2021Q2	us-gaap	Operating Expenses OperatingExpenses	88504000	USD
CY2020Q2	us-gaap	Operating Expenses OperatingExpenses	79074000	USD
	us-gaap	Operating Expenses OperatingExpenses	228093000	USD
	us-gaap	Operating Expenses OperatingExpenses	189630000	USD
CY2021Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	22578000	USD
CY2020Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	17977000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	74175000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	60111000	USD
CY2021Q2	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	1456000	USD
CY2020Q2	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-279000	USD
	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	1841000	USD
	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	3039000	USD
CY2021Q2	us-gaap	Interest Expense InterestExpense	5054000	USD
CY2020Q2	us-gaap	Interest Expense InterestExpense	5054000	USD
	us-gaap	Interest Expense InterestExpense	10159000	USD
	us-gaap	Interest Expense InterestExpense	10868000	USD
CY2021Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	18980000	USD
CY2020Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	12644000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	65857000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	52282000	USD
CY2021Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	5165000	USD
CY2020Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1983000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	17570000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	12580000	USD
CY2021Q2	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	13815000	USD
CY2020Q2	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	10661000	USD
	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	48287000	USD
	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	39702000	USD
CY2021Q2	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	-2000	USD
CY2020Q2	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	295000	USD
	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	-8000	USD
	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	184000	USD
CY2021Q2	us-gaap	Net Income Loss NetIncomeLoss	13813000	USD
CY2020Q2	us-gaap	Net Income Loss NetIncomeLoss	10956000	USD
	us-gaap	Net Income Loss NetIncomeLoss	48279000	USD
	us-gaap	Net Income Loss NetIncomeLoss	39886000	USD
CY2021Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	17546346	shares
CY2020Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16448490	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	17516273	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16431724	shares
CY2021Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	17616496	shares
CY2020Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	16503603	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	17585006	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	16487807	shares
CY2021Q2	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.79
CY2020Q2	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.65
	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	2.76
	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	2.42
CY2021Q2	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Basic Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare	0
CY2020Q2	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Basic Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare	0.02
	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
CY2021Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.79
CY2020Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.67
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.76
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.43
CY2021Q2	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.78
CY2020Q2	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.64
	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	2.75
	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	2.41
CY2021Q2	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Diluted Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare	0
CY2020Q2	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Diluted Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare	0.02
	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
CY2021Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.78
CY2020Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.66
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.75
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.42
CY2021Q2	us-gaap	Net Income Loss NetIncomeLoss	13813000	USD
CY2020Q2	us-gaap	Net Income Loss NetIncomeLoss	10956000	USD
	us-gaap	Net Income Loss NetIncomeLoss	48279000	USD
	us-gaap	Net Income Loss NetIncomeLoss	39886000	USD
CY2021Q2	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
CY2020Q2	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	-28000	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	-28000	USD
CY2021Q2	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
CY2020Q2	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	-156000	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	-160000	USD
CY2021Q2	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	3126000	USD
CY2020Q2	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	1703000	USD
	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	3291000	USD
	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	1710000	USD
CY2021Q2	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	6000	USD
CY2020Q2	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	-37000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	4000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	-37000	USD
CY2021Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	3196000	USD
CY2020Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	1732000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	3423000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	1805000	USD
CY2021Q2	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	17009000	USD
CY2020Q2	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	12688000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	51702000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	41691000	USD
CY2021Q2	us-gaap	Public Utilities Property Plant And Equipment Plant In Service PublicUtilitiesPropertyPlantAndEquipmentPlantInService	1643904000	USD
CY2020Q4	us-gaap	Public Utilities Property Plant And Equipment Plant In Service PublicUtilitiesPropertyPlantAndEquipmentPlantInService	1577576000	USD
CY2021Q2	cpk	Unregulated Energy Property Plant And Equipment UnregulatedEnergyPropertyPlantAndEquipment	309139000	USD
CY2020Q4	cpk	Unregulated Energy Property Plant And Equipment UnregulatedEnergyPropertyPlantAndEquipment	300647000	USD
CY2021Q2	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	34767000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	30769000	USD
CY2021Q2	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	1987810000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	1908992000	USD
CY2021Q2	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	393111000	USD
CY2020Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	368743000	USD
CY2021Q2	cpk	Construction Workin Progress ConstructionWorkinProgress	78187000	USD
CY2020Q4	cpk	Construction Workin Progress ConstructionWorkinProgress	60929000	USD
CY2021Q2	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1672886000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1601178000	USD
CY2021Q2	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	5011000	USD
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	3499000	USD
CY2021Q2	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	45206000	USD
CY2020Q4	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	61675000	USD
CY2021Q2	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	3895000	USD
CY2020Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	4785000	USD
CY2021Q2	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	41311000	USD
CY2020Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	56890000	USD
CY2021Q2	cpk	Accrued Revenue AccruedRevenue	13370000	USD
CY2020Q4	cpk	Accrued Revenue AccruedRevenue	21527000	USD
CY2021Q2	us-gaap	Energy Related Inventory Propane Gas EnergyRelatedInventoryPropaneGas	6076000	USD
CY2020Q4	us-gaap	Energy Related Inventory Propane Gas EnergyRelatedInventoryPropaneGas	5906000	USD
CY2021Q2	us-gaap	Other Inventory OtherInventory	6524000	USD
CY2020Q4	us-gaap	Other Inventory OtherInventory	5539000	USD
CY2021Q2	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	9429000	USD
CY2020Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	10786000	USD
CY2021Q2	us-gaap	Energy Related Inventory Natural Gas In Storage EnergyRelatedInventoryNaturalGasInStorage	2385000	USD
CY2020Q4	us-gaap	Energy Related Inventory Natural Gas In Storage EnergyRelatedInventoryNaturalGasInStorage	2455000	USD
CY2021Q2	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	8371000	USD
CY2020Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	12885000	USD
CY2021Q2	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	9497000	USD
CY2020Q4	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	13239000	USD
CY2021Q2	us-gaap	Energy Marketing Contracts Assets Current EnergyMarketingContractsAssetsCurrent	8056000	USD
CY2020Q4	us-gaap	Energy Marketing Contracts Assets Current EnergyMarketingContractsAssetsCurrent	3269000	USD
CY2020Q4	us-gaap	Energy Marketing Contracts Assets Current EnergyMarketingContractsAssetsCurrent	3269000	USD
CY2021Q2	us-gaap	Other Assets Current OtherAssetsCurrent	523000	USD
CY2020Q4	us-gaap	Other Assets Current OtherAssetsCurrent	436000	USD
CY2021Q2	us-gaap	Assets Current AssetsCurrent	110553000	USD
CY2020Q4	us-gaap	Assets Current AssetsCurrent	136431000	USD
CY2021Q2	us-gaap	Goodwill Goodwill	38803000	USD
CY2020Q4	us-gaap	Goodwill Goodwill	38731000	USD
CY2021Q2	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	7625000	USD
CY2020Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	8292000	USD
CY2021Q2	us-gaap	Investments Fair Value Disclosure InvestmentsFairValueDisclosure	11745000	USD
CY2020Q4	us-gaap	Investments Fair Value Disclosure InvestmentsFairValueDisclosure	10776000	USD
CY2021Q2	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	10020000	USD
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	11194000	USD
CY2021Q2	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	109244000	USD
CY2020Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	113806000	USD
CY2021Q2	cpk	Receivables And Other Deferred Charges ReceivablesAndOtherDeferredCharges	11464000	USD
CY2020Q4	cpk	Receivables And Other Deferred Charges ReceivablesAndOtherDeferredCharges	12079000	USD
CY2021Q2	cpk	Deferred Charges And Other Assets DeferredChargesAndOtherAssets	188901000	USD
CY2020Q4	cpk	Deferred Charges And Other Assets DeferredChargesAndOtherAssets	194878000	USD
CY2021Q2	us-gaap	Assets Assets	1972340000	USD
CY2020Q4	us-gaap	Assets Assets	1932487000	USD
CY2021Q2	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2020Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2021Q2	us-gaap	Common Stock Value CommonStockValue	8550000	USD
CY2020Q4	us-gaap	Common Stock Value CommonStockValue	8499000	USD
CY2021Q2	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	357520000	USD
CY2020Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	348482000	USD
CY2021Q2	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	374936000	USD
CY2020Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	342969000	USD
CY2021Q2	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	558000	USD
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-2865000	USD
CY2021Q2	us-gaap	Compensation And Benefits Trust CompensationAndBenefitsTrust	7203000	USD
CY2020Q4	us-gaap	Compensation And Benefits Trust CompensationAndBenefitsTrust	5679000	USD
CY2021Q2	us-gaap	Treasury Stock Value TreasuryStockValue	7203000	USD
CY2020Q4	us-gaap	Treasury Stock Value TreasuryStockValue	5679000	USD
CY2021Q2	us-gaap	Stockholders Equity StockholdersEquity	741564000	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	697085000	USD
CY2021Q2	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	498450000	USD
CY2020Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	508499000	USD
CY2021Q2	us-gaap	Capitalization Longterm Debt And Equity CapitalizationLongtermDebtAndEquity	1240014000	USD
CY2020Q4	us-gaap	Capitalization Longterm Debt And Equity CapitalizationLongtermDebtAndEquity	1205584000	USD
CY2021Q2	us-gaap	Long Term Debt Current LongTermDebtCurrent	13600000	USD
CY2020Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	13600000	USD
CY2021Q2	us-gaap	Short Term Borrowings ShortTermBorrowings	169294000	USD
CY2020Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	175644000	USD
CY2021Q2	us-gaap	Accounts Payable Current AccountsPayableCurrent	49408000	USD
CY2020Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	60253000	USD
CY2021Q2	us-gaap	Contract With Customer Refund Liability Current ContractWithCustomerRefundLiabilityCurrent	33983000	USD
CY2020Q4	us-gaap	Contract With Customer Refund Liability Current ContractWithCustomerRefundLiabilityCurrent	33302000	USD
CY2021Q2	us-gaap	Interest Payable Current InterestPayableCurrent	2697000	USD
CY2020Q4	us-gaap	Interest Payable Current InterestPayableCurrent	2905000	USD
CY2021Q2	us-gaap	Dividends Payable Current DividendsPayableCurrent	8433000	USD
CY2020Q4	us-gaap	Dividends Payable Current DividendsPayableCurrent	7683000	USD
CY2021Q2	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	10767000	USD
CY2020Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	13994000	USD
CY2021Q2	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	13911000	USD
CY2020Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	6284000	USD
CY2021Q2	us-gaap	Energy Marketing Contract Liabilities Current EnergyMarketingContractLiabilitiesCurrent	351000	USD
CY2020Q4	us-gaap	Energy Marketing Contract Liabilities Current EnergyMarketingContractLiabilitiesCurrent	127000	USD
CY2021Q2	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	19812000	USD
CY2020Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	15240000	USD
CY2021Q2	us-gaap	Liabilities Current LiabilitiesCurrent	322256000	USD
CY2020Q4	us-gaap	Liabilities Current LiabilitiesCurrent	329032000	USD
CY2021Q2	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	219490000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	205388000	USD
CY2021Q2	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	143681000	USD
CY2020Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	142736000	USD
CY2021Q2	us-gaap	Accrued Environmental Loss Contingencies Noncurrent AccruedEnvironmentalLossContingenciesNoncurrent	3904000	USD
CY2020Q4	us-gaap	Accrued Environmental Loss Contingencies Noncurrent AccruedEnvironmentalLossContingenciesNoncurrent	4299000	USD
CY2021Q2	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	29463000	USD
CY2020Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	30673000	USD
CY2021Q2	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	8719000	USD
CY2020Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	9872000	USD
CY2021Q2	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	4813000	USD
CY2020Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	4903000	USD
CY2021Q2	us-gaap	Deferred Credits And Other Liabilities DeferredCreditsAndOtherLiabilities	410070000	USD
CY2020Q4	us-gaap	Deferred Credits And Other Liabilities DeferredCreditsAndOtherLiabilities	397871000	USD
CY2021Q2	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2020Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2021Q2	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1972340000	USD
CY2020Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1932487000	USD
	us-gaap	Net Income Loss NetIncomeLoss	48279000	USD
	us-gaap	Net Income Loss NetIncomeLoss	39886000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	30662000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	24500000	USD
	cpk	Depreciation And Accretion Included In Other Costs DepreciationAndAccretionIncludedInOtherCosts	5061000	USD
	cpk	Depreciation And Accretion Included In Other Costs DepreciationAndAccretionIncludedInOtherCosts	4807000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	12810000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	12232000	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	5342000	USD
	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	3496000	USD
	us-gaap	Unrealized Gain Loss On Commodity Contracts UnrealizedGainLossOnCommodityContracts	988000	USD
	us-gaap	Unrealized Gain Loss On Commodity Contracts UnrealizedGainLossOnCommodityContracts	-130000	USD
	us-gaap	Employee Benefits And Share Based Compensation EmployeeBenefitsAndShareBasedCompensation	-346000	USD
	us-gaap	Employee Benefits And Share Based Compensation EmployeeBenefitsAndShareBasedCompensation	21000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	3315000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	2322000	USD
	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-23664000	USD
	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-11455000	USD
	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	1085000	USD
	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-4140000	USD
	us-gaap	Increase Decrease In Regulatory Assets And Liabilities IncreaseDecreaseInRegulatoryAssetsAndLiabilities	-7711000	USD
	us-gaap	Increase Decrease In Regulatory Assets And Liabilities IncreaseDecreaseInRegulatoryAssetsAndLiabilities	-4133000	USD
	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-2789000	USD
	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-6016000	USD
	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	6563000	USD
	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-1604000	USD
	us-gaap	Increase Decrease In Income Taxes Receivable IncreaseDecreaseInIncomeTaxesReceivable	-4514000	USD
	us-gaap	Increase Decrease In Income Taxes Receivable IncreaseDecreaseInIncomeTaxesReceivable	1480000	USD
	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	681000	USD
	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	-232000	USD
	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	-3397000	USD
	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	-7086000	USD
	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	675000	USD
	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	3866000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	134216000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	91678000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	104631000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	82779000	USD
	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	497000	USD
	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	4273000	USD
	cpk	Proceedsfrom Divestitureof Businesses Incremental ProceedsfromDivestitureofBusinessesIncremental	0	USD
	cpk	Proceedsfrom Divestitureof Businesses Incremental ProceedsfromDivestitureofBusinessesIncremental	200000	USD
	cpk	Payments For Environmental Expenditures PaymentsForEnvironmentalExpenditures	395000	USD
	cpk	Payments For Environmental Expenditures PaymentsForEnvironmentalExpenditures	1948000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-104529000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-80254000	USD
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	15047000	USD
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	12976000	USD
	us-gaap	Proceeds From Issuance Or Sale Of Equity ProceedsFromIssuanceOrSaleOfEquity	4799000	USD
	us-gaap	Proceeds From Issuance Or Sale Of Equity ProceedsFromIssuanceOrSaleOfEquity	359000	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	-1101000	USD
	us-gaap	Increase Decrease In Outstanding Checks Financing Activities IncreaseDecreaseInOutstandingChecksFinancingActivities	-1690000	USD
	us-gaap	Proceeds From Repayments Of Lines Of Credit ProceedsFromRepaymentsOfLinesOfCredit	-5249000	USD
	us-gaap	Proceeds From Repayments Of Lines Of Credit ProceedsFromRepaymentsOfLinesOfCredit	40578000	USD
	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	0	USD
	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	13000	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	-28175000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-14819000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	1512000	USD
CY2020Q2	cpk	Stock Issued During The Period Value Retirement Savings Plan And Dividend Reinvestment Plan StockIssuedDuringThePeriodValueRetirementSavingsPlanAndDividendReinvestmentPlan	1932000	USD
CY2020Q2	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	1834000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-3395000	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
CY2021Q2	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	5011000	USD
CY2020Q2	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	3590000	USD
CY2020Q1	us-gaap	Stockholders Equity StockholdersEquity	584129000	USD
CY2020Q2	us-gaap	Net Income Loss NetIncomeLoss	10956000	USD
CY2020Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	1732000	USD
CY2020Q2	us-gaap	Dividends Dividends	7306000	USD
CY2020Q2	us-gaap	Stockholders Equity StockholdersEquity	593277000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	561577000	USD
	us-gaap	Net Income Loss NetIncomeLoss	39886000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	1805000	USD
	us-gaap	Dividends Dividends	14009000	USD
	cpk	Stock Issued During The Period Value Retirement Savings Plan And Dividend Reinvestment Plan StockIssuedDuringThePeriodValueRetirementSavingsPlanAndDividendReinvestmentPlan	2286000	USD
	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	1762000	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
CY2020Q2	us-gaap	Stockholders Equity StockholdersEquity	593277000	USD
CY2021Q1	us-gaap	Stockholders Equity StockholdersEquity	726388000	USD
CY2021Q2	us-gaap	Net Income Loss NetIncomeLoss	13813000	USD
CY2021Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	3196000	USD
CY2021Q2	us-gaap	Dividends Dividends	8500000	USD
CY2021Q2	cpk	Stock Issued During The Period Value Retirement Savings Plan And Dividend Reinvestment Plan StockIssuedDuringThePeriodValueRetirementSavingsPlanAndDividendReinvestmentPlan	4621000	USD
CY2021Q2	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	2046000	USD
CY2021Q2	cpk	Treasury Stock Activity And Deferred Compensation Plan Activity During Period Value TreasuryStockActivityAndDeferredCompensationPlanActivityDuringPeriodValue	0	USD
CY2021Q2	us-gaap	Stockholders Equity StockholdersEquity	741564000	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	697085000	USD
	us-gaap	Net Income Loss NetIncomeLoss	48279000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	3423000	USD
	us-gaap	Dividends Dividends	16312000	USD
	cpk	Stock Issued During The Period Value Retirement Savings Plan And Dividend Reinvestment Plan StockIssuedDuringThePeriodValueRetirementSavingsPlanAndDividendReinvestmentPlan	6835000	USD
	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	2254000	USD
CY2021Q2	us-gaap	Stockholders Equity StockholdersEquity	741564000	USD
CY2021Q2	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	2000000	shares
CY2021Q2	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2021Q2	cpk	Shares Held In Trust For Deferred Compensation Plan SharesHeldInTrustForDeferredCompensationPlan	117193	shares
CY2020Q4	cpk	Shares Held In Trust For Deferred Compensation Plan SharesHeldInTrustForDeferredCompensationPlan	105087	shares
CY2020Q2	cpk	Shares Held In Trust For Deferred Compensation Plan SharesHeldInTrustForDeferredCompensationPlan	107141	shares
CY2019Q4	cpk	Shares Held In Trust For Deferred Compensation Plan SharesHeldInTrustForDeferredCompensationPlan	95329	shares
	us-gaap	Shares Paid For Tax Withholding For Share Based Compensation SharesPaidForTaxWithholdingForShareBasedCompensation	14020	shares
	us-gaap	Shares Paid For Tax Withholding For Share Based Compensation SharesPaidForTaxWithholdingForShareBasedCompensation	10319	shares
CY2021Q2	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	13815000	USD
CY2020Q2	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	10661000	USD
	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	-8000	USD
	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	48287000	USD
	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	39702000	USD
CY2021Q2	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	-2000	USD
CY2020Q2	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	295000	USD
	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	184000	USD
CY2021Q2	us-gaap	Net Income Loss NetIncomeLoss	13813000	USD
CY2020Q2	us-gaap	Net Income Loss NetIncomeLoss	10956000	USD
	us-gaap	Net Income Loss NetIncomeLoss	48279000	USD
	us-gaap	Net Income Loss NetIncomeLoss	39886000	USD
CY2021Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	17546346	shares
CY2020Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16448490	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	17516273	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16431724	shares
CY2021Q2	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.79
CY2020Q2	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.65
	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	2.76
	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	2.42
CY2021Q2	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Basic Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare	0
CY2020Q2	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Basic Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare	0.02
	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
CY2021Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.79
CY2020Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.67
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.76
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.43
CY2021Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	17546346	shares
CY2020Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16448490	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	17516273	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16431724	shares
CY2021Q2	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	70150	shares
CY2020Q2	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	55113	shares
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	68733	shares
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	56083	shares
CY2021Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	17616496	shares
CY2020Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	16503603	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	17585006	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	16487807	shares
CY2021Q2	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.78
CY2020Q2	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.64
	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	2.75
	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	2.41
CY2021Q2	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Diluted Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare	0
CY2020Q2	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Diluted Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare	0.02
	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
CY2021Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.78
CY2020Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.66
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.75
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.42
CY2021Q2	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	111082000	USD
CY2020Q2	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	97051000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	302268000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	249741000	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
CY2021Q2	us-gaap	Receivables From Customers ReceivablesFromCustomers	37341000	USD
CY2021Q2	us-gaap	Contract With Customer Asset Net Current ContractWithCustomerAssetNetCurrent	18000	USD
CY2021Q2	us-gaap	Contract With Customer Asset Net Noncurrent ContractWithCustomerAssetNetNoncurrent	5179000	USD
CY2021Q2	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	342000	USD
	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	-18259000	USD
	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	0	USD
	us-gaap	Increase Decrease In Other Noncurrent Assets IncreaseDecreaseInOtherNoncurrentAssets	363000	USD
	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	-302000	USD
CY2021Q2	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	200000	USD
	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	600000	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
CY2021Q2	cpk	Covid19 Settlement Amount COVID19SettlementAmount	2100000	USD
CY2021Q2	cpk	Covid19 Regulatory Asset COVID19RegulatoryAsset	1600000	USD
	cpk	Companys Exposure In Number Of Former Manufactured Gas Plant Sites CompanysExposureInNumberOfFormerManufacturedGasPlantSites	7	site
CY2021Q2	cpk	Debt Service Coverage Ratio DebtServiceCoverageRatio	1.25
CY2021Q2	cpk	Debt Service Coverage Ratio Measurement Period DebtServiceCoverageRatioMeasurementPeriod	12
	cpk	Ratiobasedonaveragenumberofpriorquarters Ratiobasedonaveragenumberofpriorquarters	6
CY2021Q2	cpk	Minimum Interest Coverage Ratio Under Agreement Two MinimumInterestCoverageRatioUnderAgreementTwo	2
CY2021Q2	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
CY2021Q2	us-gaap	Guarantee Obligations Maximum Exposure GuaranteeObligationsMaximumExposure	20000000.0	USD
CY2021Q2	us-gaap	Guarantee Obligations Current Carrying Value GuaranteeObligationsCurrentCarryingValue	8000000.0	USD
	cpk	Standby Letters Of Credit StandbyLettersOfCredit	4800000	USD
	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	2
CY2021Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	22578000	USD
CY2020Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	17977000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	74175000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	60111000	USD
CY2021Q2	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	1456000	USD
CY2020Q2	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-279000	USD
	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	1841000	USD
	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	3039000	USD
CY2021Q2	us-gaap	Interest Expense InterestExpense	5054000	USD
CY2020Q2	us-gaap	Interest Expense InterestExpense	5054000	USD
	us-gaap	Interest Expense InterestExpense	10159000	USD
	us-gaap	Interest Expense InterestExpense	10868000	USD
CY2021Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	18980000	USD
CY2020Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	12644000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	65857000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	52282000	USD
CY2021Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	5165000	USD
CY2020Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1983000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	17570000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	12580000	USD
CY2021Q2	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	-2000	USD
CY2020Q2	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	295000	USD
	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	-8000	USD
	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	184000	USD
CY2021Q2	us-gaap	Net Income Loss NetIncomeLoss	13813000	USD
CY2020Q2	us-gaap	Net Income Loss NetIncomeLoss	10956000	USD
	us-gaap	Net Income Loss NetIncomeLoss	48279000	USD
CY2021Q1	cpk	Proceeds From Issuance Of Common Stock At The Market ProceedsFromIssuanceOfCommonStockAtTheMarket	61000000.0	USD
CY2021Q1	cpk	Fees On Equity Issuance At The Market FeesOnEquityIssuanceAtTheMarket	1500000	USD
	us-gaap	Net Income Loss NetIncomeLoss	39886000	USD
CY2021Q2	us-gaap	Assets Assets	1972340000	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
CY2020Q4	us-gaap	Stock Issued During Period Shares Dividend Reinvestment Plan StockIssuedDuringPeriodSharesDividendReinvestmentPlan	300000	shares
CY2020Q4	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	86.12	USD
CY2020Q4	us-gaap	Proceeds From Issuance Of Common Stock Dividend Reinvestment Plan ProceedsFromIssuanceOfCommonStockDividendReinvestmentPlan	22000000.0	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	113.51	USD
	us-gaap	Proceeds From Issuance Of Common Stock Dividend Reinvestment Plan ProceedsFromIssuanceOfCommonStockDividendReinvestmentPlan	4500000	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	5848000	USD
	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	2425000	USD
CY2021Q2	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Remainder Of Fiscal Year DefinedBenefitPlanExpectedFutureBenefitPaymentsRemainderOfFiscalYear	700000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	3423000	USD
CY2021Q2	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	558000	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	2741000	USD
	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	936000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	1805000	USD
CY2020Q2	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-4462000	USD
CY2021Q2	us-gaap	Defined Benefit Plan Amortization Of Prior Service Cost Credit DefinedBenefitPlanAmortizationOfPriorServiceCostCredit	-19000	USD
CY2021Q2	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	-230000	USD
CY2021Q2	cpk	Defined Benefit Plan Amounts Recognized Gain Loss DefinedBenefitPlanAmountsRecognizedGainLoss	211000	USD
CY2021Q2	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	87000	USD
CY2021Q2	cpk	Defined Benefit Plan Amounts Recognized From Regulatory Asset DefinedBenefitPlanAmountsRecognizedFromRegulatoryAsset	124000	USD
	cpk	Defined Benefit Plan Amounts Recognized From Regulatory Asset DefinedBenefitPlanAmountsRecognizedFromRegulatoryAsset	218000	USD
CY2021Q2	cpk	Defined Benefit Plan Amounts Recognized Gain Loss DefinedBenefitPlanAmountsRecognizedGainLoss	211000	USD
CY2020Q2	us-gaap	Defined Benefit Plan Amortization Of Prior Service Cost Credit DefinedBenefitPlanAmortizationOfPriorServiceCostCredit	-19000	USD
CY2020Q2	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	-217000	USD
CY2020Q2	cpk	Defined Benefit Plan Amounts Recognized Gain Loss DefinedBenefitPlanAmountsRecognizedGainLoss	198000	USD
CY2020Q2	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	89000	USD
CY2020Q2	cpk	Defined Benefit Plan Amounts Recognized From Regulatory Asset DefinedBenefitPlanAmountsRecognizedFromRegulatoryAsset	109000	USD
CY2020Q2	cpk	Defined Benefit Plan Actuarial Gain Loss Net Settlement DefinedBenefitPlanActuarialGainLossNetSettlement	198000	USD
	us-gaap	Defined Benefit Plan Amortization Of Prior Service Cost Credit DefinedBenefitPlanAmortizationOfPriorServiceCostCredit	-38000	USD
	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	-458000	USD
	cpk	Defined Benefit Plan Amounts Recognized Gain Loss DefinedBenefitPlanAmountsRecognizedGainLoss	420000	USD
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	171000	USD
	cpk	Defined Benefit Plan Amounts Recognized From Regulatory Asset DefinedBenefitPlanAmountsRecognizedFromRegulatoryAsset	249000	USD
	cpk	Defined Benefit Plan Amounts Recognized Gain Loss DefinedBenefitPlanAmountsRecognizedGainLoss	420000	USD
	us-gaap	Defined Benefit Plan Amortization Of Prior Service Cost Credit DefinedBenefitPlanAmortizationOfPriorServiceCostCredit	-38000	USD
	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	-434000	USD
	cpk	Defined Benefit Plan Amounts Recognized Gain Loss DefinedBenefitPlanAmountsRecognizedGainLoss	396000	USD
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	178000	USD
	cpk	Defined Benefit Plan Actuarial Gain Loss Net Settlement DefinedBenefitPlanActuarialGainLossNetSettlement	396000	USD
CY2021Q2	us-gaap	Investments Fair Value Disclosure InvestmentsFairValueDisclosure	11745000	USD
CY2020Q4	us-gaap	Investments Fair Value Disclosure InvestmentsFairValueDisclosure	10776000	USD
CY2021Q2	us-gaap	Trading Securities Unrealized Holding Gain Loss TradingSecuritiesUnrealizedHoldingGainLoss	600000	USD
CY2020Q2	us-gaap	Trading Securities Unrealized Holding Gain Loss TradingSecuritiesUnrealizedHoldingGainLoss	1400000	USD
	us-gaap	Trading Securities Unrealized Holding Gain Loss TradingSecuritiesUnrealizedHoldingGainLoss	1000000.0	USD
	us-gaap	Trading Securities Unrealized Holding Gain Loss TradingSecuritiesUnrealizedHoldingGainLoss	-100000	USD
CY2021Q2	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	1439000	USD
CY2020Q2	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	1266000	USD
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	3315000	USD
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	2322000	USD
CY2021Q2	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	384000	USD
CY2020Q2	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	331000	USD
	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	885000	USD
	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	607000	USD
CY2021Q2	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	1055000	USD
CY2020Q2	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	935000	USD
	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	2430000	USD
	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	1715000	USD
CY2021Q2	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	6100000	USD
CY2020	us-gaap	Notional Amount Of Nonderivative Instruments NotionalAmountOfNonderivativeInstruments	60000000.0	USD
CY2021Q1	us-gaap	Notional Amount Of Nonderivative Instruments NotionalAmountOfNonderivativeInstruments	40000000.0	USD
CY2021Q2	us-gaap	Energy Marketing Contracts Assets Current EnergyMarketingContractsAssetsCurrent	8056000	USD
CY2020Q4	us-gaap	Energy Marketing Contracts Assets Current EnergyMarketingContractsAssetsCurrent	3269000	USD
CY2021Q2	us-gaap	Energy Marketing Contract Liabilities Current EnergyMarketingContractLiabilitiesCurrent	351000	USD
CY2020Q4	us-gaap	Energy Marketing Contract Liabilities Current EnergyMarketingContractLiabilitiesCurrent	127000	USD
CY2021Q2	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	4804000	USD
CY2020Q2	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	2552000	USD
	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	8057000	USD
	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	3788000	USD
CY2021Q2	us-gaap	Energy Marketing Contracts Assets Current EnergyMarketingContractsAssetsCurrent	8056000	USD
CY2021Q2	us-gaap	Energy Marketing Contracts Assets Current EnergyMarketingContractsAssetsCurrent	8056000	USD
CY2021Q2	us-gaap	Energy Marketing Contract Liabilities Current EnergyMarketingContractLiabilitiesCurrent	351000	USD
CY2021Q2	us-gaap	Energy Marketing Contract Liabilities Current EnergyMarketingContractLiabilitiesCurrent	351000	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	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	70000	USD
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases Sales Issuances Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements	226000	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	1345000	USD
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Sales FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales	51000	USD
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Sales FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales	50000	USD
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings1 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1	-16000	USD
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings1 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1	-10000	USD
CY2021Q2	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	2191000	USD
CY2020Q2	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	2334000	USD
CY2021Q2	us-gaap	Long Term Debt LongTermDebt	512900000	USD
CY2021Q2	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	541500000	USD
CY2020Q4	us-gaap	Long Term Debt LongTermDebt	523000000.0	USD
CY2020Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	548500000	USD
CY2021Q2	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	850000	USD
CY2020Q4	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	901000	USD
CY2021Q2	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	512050000	USD
CY2020Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	522099000	USD
CY2021Q2	us-gaap	Long Term Debt Current LongTermDebtCurrent	13600000	USD
CY2020Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	13600000	USD
CY2021Q2	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	498450000	USD
CY2020Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	508499000	USD
CY2021Q2	us-gaap	Debt Instrument Unused Borrowing Capacity Amount DebtInstrumentUnusedBorrowingCapacityAmount	310000000	USD
CY2021Q2	us-gaap	Short Term Borrowings ShortTermBorrowings	169300000	USD
CY2020Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	175600000	USD
CY2021Q2	us-gaap	Short Term Debt Weighted Average Interest Rate ShortTermDebtWeightedAverageInterestRate	0.0111
CY2020Q4	us-gaap	Short Term Debt Weighted Average Interest Rate ShortTermDebtWeightedAverageInterestRate	0.0128
CY2020Q2	us-gaap	Operating Lease Cost OperatingLeaseCost	629000	USD
CY2021Q2	us-gaap	Notional Amount Of Nonderivative Instruments NotionalAmountOfNonderivativeInstruments	100000000.0	USD
CY2020	us-gaap	Notional Amount Of Nonderivative Instruments NotionalAmountOfNonderivativeInstruments	60000000.0	USD
CY2021Q1	us-gaap	Notional Amount Of Nonderivative Instruments NotionalAmountOfNonderivativeInstruments	40000000.0	USD
CY2021Q2	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	375000000.0	USD
CY2021Q2	us-gaap	Ratio Of Indebtedness To Net Capital1 RatioOfIndebtednessToNetCapital1	0.65
	us-gaap	Line Of Credit Facility Commitment Fee Percentage LineOfCreditFacilityCommitmentFeePercentage	0.15
	us-gaap	Line Of Credit Facility Interest Rate During Period LineOfCreditFacilityInterestRateDuringPeriod	1.0
CY2021Q4	us-gaap	Line Of Credit Facility Remaining Borrowing Capacity LineOfCreditFacilityRemainingBorrowingCapacity	200900000	USD
	cpk	Standby Letters Of Credit StandbyLettersOfCredit	4800000	USD
CY2021Q2	us-gaap	Operating Lease Cost OperatingLeaseCost	515000	USD
	us-gaap	Operating Lease Cost OperatingLeaseCost	1038000	USD
	us-gaap	Operating Lease Cost OperatingLeaseCost	1255000	USD
CY2021Q2	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.038
CY2021Q2	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	10020000	USD
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	11194000	USD
CY2021Q2	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	1732000	USD
CY2020Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	1747000	USD
CY2021Q2	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	8719000	USD
CY2020Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	9872000	USD
CY2021Q2	cpk	Total Operatingand Finance Lease Liabilities TotalOperatingandFinanceLeaseLiabilities	10451000	USD
CY2020Q4	cpk	Total Operatingand Finance Lease Liabilities TotalOperatingandFinanceLeaseLiabilities	11619000	USD
CY2021Q2	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P8Y7M24D
CY2020Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P8Y8M12D
CY2020Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.038
	us-gaap	Operating Lease Payments OperatingLeasePayments	936000	USD
	us-gaap	Operating Lease Payments OperatingLeasePayments	1034000	USD
CY2021Q2	us-gaap	Lessee Operating Lease Liability Payments Remainder Of Fiscal Year LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear	1060000	USD
CY2021Q2	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	1845000	USD
CY2021Q2	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	1762000	USD
CY2021Q2	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	1607000	USD
CY2021Q2	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	1387000	USD
CY2021Q2	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	951000	USD
CY2021Q2	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	3596000	USD
CY2021Q2	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	12208000	USD
CY2021Q2	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	1757000	USD
CY2021Q2	us-gaap	Operating Lease Liability OperatingLeaseLiability	10451000	USD
CY2021Q2	cpk	Lessee Future Operating Lease Option Payments LesseeFutureOperatingLeaseOptionPayments	2100000	USD

Files In Submission

Name	View Source	Status
0001628280-21-015580-index-headers.html	Edgar Link	pending
0001628280-21-015580-index.html	Edgar Link	pending
0001628280-21-015580.txt	Edgar Link	pending
0001628280-21-015580-xbrl.zip	Edgar Link	pending
cpk-20210630.htm	Edgar Link	pending
cpk-20210630.xsd	Edgar Link	pending
cpk-20210630_cal.xml	Edgar Link	unprocessable
cpk-20210630_def.xml	Edgar Link	unprocessable
cpk-20210630_htm.xml	Edgar Link	completed
cpk-20210630_lab.xml	Edgar Link	unprocessable
cpk-20210630_pre.xml	Edgar Link	unprocessable
cpk06302021ex-101.htm	Edgar Link	pending
cpk06302021ex-311.htm	Edgar Link	pending
cpk06302021ex-312.htm	Edgar Link	pending
cpk06302021ex-321.htm	Edgar Link	pending
cpk06302021ex-322.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
image.jpg	Edgar Link	pending
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$CPK
CHESAPEAKE UTILITIES CORP Stock $cpk

2021 Q2 Form 10-Q Financial Statement

#000162828021015580 Filed on August 04, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CPK CHESAPEAKE UTILITIES CORP Stock $cpk

2021 Q2 Form 10-Q Financial Statement

#000162828021015580 Filed on August 04, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CPK
CHESAPEAKE UTILITIES CORP Stock $cpk