$CPK
CHESAPEAKE UTILITIES CORP Stock $cpk

$cpk Overview Financials Valuation SEC Filings Company Website

2020 Q4 Form 10-Q Financial Statement

#000162828020015567 Filed on November 05, 2020

Income Statement

Concept	2020 Q4	2020 Q3	2019 Q3
Revenue	$137.0M	$101.4M	$92.63M
YoY Change	3.84%	9.49%	-0.83%
Cost Of Revenue	$40.20M	$21.90M	$25.30M
YoY Change	-6.73%	-13.44%	-18.39%
Gross Profit	$96.80M	$79.50M	$67.30M
YoY Change	8.89%	18.13%	7.85%
Gross Profit Margin	70.64%	78.39%	72.66%
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$15.30M	$18.30M	$11.30M
YoY Change	28.57%	61.95%	6.27%
% of Gross Profit	15.81%	23.02%	16.79%
Operating Expenses	$61.60M	$84.01M	$78.27M
YoY Change	4.05%	7.34%	-2.8%
Operating Profit	$35.21M	$17.41M	$14.36M
YoY Change	18.77%	21.24%	11.48%
Interest Expense	-$6.300M	$4.584M	$5.403M
YoY Change	12.5%	-15.16%	24.01%
% of Operating Profit	-17.89%	26.34%	37.63%
Other Income/Expense, Net	$200.0K	-$40.00K	-$351.0K
YoY Change	-118.18%	-88.6%	8675.0%
Pretax Income	$29.10M	$12.78M	$8.603M
YoY Change	27.07%	48.58%	1.0%
Income Tax	$7.500M	$3.502M	$2.352M
% Of Pretax Income	25.77%	27.4%	27.34%
Net Earnings	$22.56M	$5.621M	$5.621M
YoY Change	0.0%	0.0%	1.5%
Net Earnings / Revenue	16.47%	5.54%	6.07%
Basic Earnings Per Share	$1.38	$0.34	$0.34
Diluted Earnings Per Share	$1.37	$0.34	$0.34
COMMON SHARES
Basic Shares Outstanding	17.46M shares	16.53M shares	16.40M shares
Diluted Shares Outstanding		16.59M shares	16.45M shares

Balance Sheet

Concept	2020 Q4	2020 Q3	2019 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$3.500M	$3.100M	$4.300M
YoY Change	-50.0%	-27.91%	-30.65%
Cash & Equivalents	$3.499M	$3.056M	$4.320M
Short-Term Investments
Other Short-Term Assets	$436.0K	$753.0K	$2.489M
YoY Change	-84.86%	-69.75%	-2.66%
Inventory	$13.90M	$12.70M	$12.60M
Prepaid Expenses	$13.24M	$14.82M	$10.57M
Receivables	$56.89M	$49.00M	$34.50M
Other Receivables	$12.90M	$15.20M	$11.10M
Total Short-Term Assets	$136.4M	$119.3M	$114.9M
YoY Change	1.19%	3.87%	-10.92%
LONG-TERM ASSETS
Property, Plant & Equipment	$1.601B	$1.567B	$1.461B
YoY Change	9.39%	7.28%	15.64%
Goodwill	$38.73M	$36.93M	$21.52M
YoY Change	18.56%	71.64%	9.75%
Intangibles	$8.292M	$7.215M	$3.272M
YoY Change	2.01%	120.51%	-19.67%
Long-Term Investments	$10.80M	$9.700M	$8.500M
YoY Change	17.39%	14.12%	6.25%
Other Assets	$113.8M	$112.7M	$84.20M
YoY Change	55.04%	33.85%	10.35%
Total Long-Term Assets	$1.796B	$1.769B	$1.599B
YoY Change	8.96%	10.59%	16.18%
TOTAL ASSETS
Total Short-Term Assets	$136.4M	$119.3M	$114.9M
Total Long-Term Assets	$1.796B	$1.769B	$1.599B
Total Assets	$1.932B	$1.888B	$1.714B
YoY Change	8.37%	10.14%	13.86%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$60.25M	$46.49M	$53.15M
YoY Change	11.44%	-12.53%	-11.75%
Accrued Expenses	$32.10M	$34.70M	$30.50M
YoY Change	3.88%	13.77%	4.45%
Deferred Revenue	$644.0K	$971.0K	$774.0K
YoY Change	9.34%	25.45%	32.76%
Short-Term Debt	$175.6M	$216.4M	$224.7M
YoY Change	-29.02%	-3.71%	-16.23%
Long-Term Debt Due	$13.60M	$15.60M	$75.60M
YoY Change	-70.18%	-79.37%	686.44%
Total Short-Term Liabilities	$329.0M	$360.0M	$446.2M
YoY Change	-22.27%	-19.33%	4.47%
LONG-TERM LIABILITIES
Long-Term Debt	$508.5M	$520.0M	$375.8M
YoY Change	15.52%	38.36%	55.55%
Other Long-Term Liabilities	$4.903M	$4.936M	$3.019M
YoY Change	75.36%	63.5%	-2.27%
Total Long-Term Liabilities	$513.4M	$524.9M	$378.8M
YoY Change	15.9%	38.56%	54.82%
TOTAL LIABILITIES
Total Short-Term Liabilities	$329.0M	$360.0M	$446.2M
Total Long-Term Liabilities	$513.4M	$524.9M	$378.8M
Total Liabilities	$842.4M	$884.9M	$825.1M
YoY Change	-2.75%	7.25%	22.81%
SHAREHOLDERS EQUITY
Retained Earnings	$343.0M	$328.4M	$284.7M
YoY Change	14.09%	15.34%	13.97%
Common Stock	$357.0M	$292.0M	$265.4M
YoY Change	33.58%	10.0%	0.74%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$5.679M	$5.634M	$4.505M
YoY Change	25.01%	25.06%	17.99%
Treasury Stock Shares
Shareholders Equity	$697.1M	$616.7M	$544.7M
YoY Change
Total Liabilities & Shareholders Equity	$1.932B	$1.888B	$1.714B
YoY Change	8.37%	10.14%	13.86%

Cashflow Statement

Concept	2020 Q4	2020 Q3	2019 Q3
OPERATING ACTIVITIES
Net Income	$22.56M	$5.621M	$5.621M
YoY Change	0.0%	0.0%	1.5%
Depreciation, Depletion And Amortization	$15.30M	$18.30M	$11.30M
YoY Change	28.57%	61.95%	6.27%
Cash From Operating Activities	$43.00M	$24.20M	$29.30M
YoY Change	-4877.78%	-17.41%	49.49%
INVESTING ACTIVITIES
Capital Expenditures	-$42.10M	-$40.60M	-$48.90M
YoY Change	-7.27%	-16.97%	9.64%
Acquisitions
YoY Change
Other Investing Activities	-$3.000M	-$15.60M	-$200.0K
YoY Change	130.77%	7700.0%
Cash From Investing Activities	-$45.00M	-$56.30M	-$49.00M
YoY Change	-3.64%	14.9%	10.11%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	2.500M	31.50M	16.70M
YoY Change	-95.03%	88.62%	-37.22%
NET CHANGE
Cash From Operating Activities	43.00M	24.20M	29.30M
Cash From Investing Activities	-45.00M	-56.30M	-49.00M
Cash From Financing Activities	2.500M	31.50M	16.70M
Net Change In Cash	500.0K	-600.0K	-3.000M
YoY Change	-81.48%	-80.0%	-276.47%
FREE CASH FLOW
Cash From Operating Activities	$43.00M	$24.20M	$29.30M
Capital Expenditures	-$42.10M	-$40.60M	-$48.90M
Free Cash Flow	$85.10M	$64.80M	$78.20M
YoY Change	91.24%	-17.14%	21.81%

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	2020
	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
CY2020Q4	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	17460906	shares
	dei	Security Exchange Name SecurityExchangeName	NYSE
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
CY2019Q3	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
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
CY2019Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax	-10000	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	-95000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	282000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	152000	USD
	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	935000	USD
	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	496000	USD
CY2020Q3	cpk	Other Comprehensive Income Loss Unrealized Gain Losson Interest Rate Swaps During Period Tax OtherComprehensiveIncomeLossUnrealizedGainLossonInterestRateSwapsDuringPeriodTax	10000	USD
CY2019Q3	cpk	Other Comprehensive Income Loss Unrealized Gain Losson Interest Rate Swaps During Period Tax OtherComprehensiveIncomeLossUnrealizedGainLossonInterestRateSwapsDuringPeriodTax	0	USD
	cpk	Other Comprehensive Income Loss Unrealized Gain Losson Interest Rate Swaps During Period Tax OtherComprehensiveIncomeLossUnrealizedGainLossonInterestRateSwapsDuringPeriodTax	-4000	USD
	cpk	Other Comprehensive Income Loss Unrealized Gain Losson Interest Rate Swaps During Period Tax OtherComprehensiveIncomeLossUnrealizedGainLossonInterestRateSwapsDuringPeriodTax	0	USD
CY2020Q3	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	4130000	USD
CY2019Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	1337000	USD
CY2020Q3	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.4867
CY2019Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.4867
CY2020Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	50000000	shares
CY2019Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	50000000	shares
CY2020Q3	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	2000000	shares
CY2019Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	2000000	shares
CY2020Q3	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2019Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2020Q3	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2019Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2019Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.3700
CY2019Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.4050
CY2019Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.4050
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.18
CY2020Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.4050
CY2020Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.4400
CY2020Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.4400
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.285
	us-gaap	Proceeds From Divestiture Of Businesses ProceedsFromDivestitureOfBusinesses	23100000	USD
	us-gaap	Discontinued Operation Gain Loss From Disposal Of Discontinued Operation Before Income Tax DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax	7500000	USD
	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	5400000	USD
	cpk	Numberof Disposal Transactions NumberofDisposalTransactions	4
CY2020Q3	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P1Y
CY2020Q3	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P1Y
CY2020Q3	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P1Y
CY2020Q3	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P1Y
CY2020Q3	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P1Y
CY2020Q3	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P1Y
	cpk	Ratiosbasedonaverageofthepriorquarters Ratiosbasedonaverageofthepriorquarters	P1Y6M
CY2020Q3	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1
	cpk	Maximum Days To Make Default Good MaximumDaysToMakeDefaultGood	P5D
	us-gaap	Notional Amount Of Nonderivative Instruments NotionalAmountOfNonderivativeInstruments	100000000	USD
CY2020Q3	cpk	Numberofshorttermlinesof Creditrateswap NumberofshorttermlinesofCreditrateswap	3
	dei	Document Type DocumentType	10-Q
	dei	Document Quarterly Report DocumentQuarterlyReport	true
	dei	Document Period End Date DocumentPeriodEndDate	2020-09-30
	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	Entity Small Business EntitySmallBusiness	false
	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
	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 Emerging Growth Company EntityEmergingGrowthCompany	false
	dei	Entity Shell Company EntityShellCompany	false
CY2019Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.4867
CY2020Q4	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	17460906	shares
CY2020Q3	us-gaap	Regulated Operating Revenue RegulatedOperatingRevenue	82762000	USD
CY2019Q3	us-gaap	Regulated Operating Revenue RegulatedOperatingRevenue	74580000	USD
	us-gaap	Regulated Operating Revenue RegulatedOperatingRevenue	259235000	USD
	us-gaap	Regulated Operating Revenue RegulatedOperatingRevenue	251601000	USD
CY2020Q3	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	18657000	USD
CY2019Q3	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	18046000	USD
	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	91925000	USD
	cpk	Regulated Energy Cost Of Sales RegulatedEnergyCostOfSales	74452000	USD
	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	96029000	USD
CY2020Q3	us-gaap	Revenues Revenues	101419000	USD
CY2019Q3	us-gaap	Revenues Revenues	92626000	USD
	us-gaap	Revenues Revenues	351160000	USD
	us-gaap	Revenues Revenues	347630000	USD
CY2020Q3	cpk	Regulated Energy Cost Of Sales RegulatedEnergyCostOfSales	16271000	USD
CY2019Q3	cpk	Regulated Energy Cost Of Sales RegulatedEnergyCostOfSales	19619000	USD
	cpk	Regulated Energy Cost Of Sales RegulatedEnergyCostOfSales	67490000	USD
CY2020Q3	cpk	Unregulated Energy And Other Cost Of Sales UnregulatedEnergyAndOtherCostOfSales	5640000	USD
CY2019Q3	cpk	Unregulated Energy And Other Cost Of Sales UnregulatedEnergyAndOtherCostOfSales	5709000	USD
	cpk	Unregulated Energy And Other Cost Of Sales UnregulatedEnergyAndOtherCostOfSales	30250000	USD
	cpk	Unregulated Energy And Other Cost Of Sales UnregulatedEnergyAndOtherCostOfSales	36975000	USD
CY2020Q3	cpk	Operations Operations	34959000	USD
CY2019Q3	cpk	Operations Operations	32614000	USD
	cpk	Operations Operations	105516000	USD
	cpk	Operations Operations	99558000	USD
CY2020Q3	us-gaap	Operating Costs And Expenses OperatingCostsAndExpenses	3717000	USD
CY2019Q3	us-gaap	Operating Costs And Expenses OperatingCostsAndExpenses	3920000	USD
	us-gaap	Operating Costs And Expenses OperatingCostsAndExpenses	11695000	USD
	us-gaap	Operating Costs And Expenses OperatingCostsAndExpenses	11200000	USD
	cpk	Settlement Gain SettlementGain	130000	USD
	cpk	Settlement Gain SettlementGain	130000	USD
CY2020Q3	cpk	Depreciationand Amortization Costs DepreciationandAmortizationCosts	18293000	USD
CY2019Q3	cpk	Depreciationand Amortization Costs DepreciationandAmortizationCosts	11220000	USD
	cpk	Depreciationand Amortization Costs DepreciationandAmortizationCosts	42793000	USD
	cpk	Depreciationand Amortization Costs DepreciationandAmortizationCosts	33612000	USD
CY2020Q3	us-gaap	Taxes Other TaxesOther	5133000	USD
CY2019Q3	us-gaap	Taxes Other TaxesOther	5187000	USD
	us-gaap	Taxes Other TaxesOther	16028000	USD
	us-gaap	Taxes Other TaxesOther	15318000	USD
CY2020Q3	us-gaap	Operating Expenses OperatingExpenses	84013000	USD
	us-gaap	Operating Expenses OperatingExpenses	270985000	USD
CY2019Q3	us-gaap	Operating Expenses OperatingExpenses	78269000	USD
	us-gaap	Operating Expenses OperatingExpenses	273642000	USD
CY2020Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	17406000	USD
CY2019Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	14357000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	77518000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	76645000	USD
CY2020Q3	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-40000	USD
CY2019Q3	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-351000	USD
	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	2997000	USD
	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-731000	USD
CY2020Q3	us-gaap	Interest Expense InterestExpense	4584000	USD
CY2019Q3	us-gaap	Interest Expense InterestExpense	5403000	USD
	us-gaap	Interest Expense InterestExpense	15452000	USD
	us-gaap	Interest Expense InterestExpense	16583000	USD
CY2020Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	12782000	USD
CY2019Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	8603000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	65063000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	59331000	USD
CY2020Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3502000	USD
CY2019Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	2352000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	16082000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	15354000	USD
CY2020Q3	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	-19000	USD
CY2019Q3	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	-630000	USD
	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	165000	USD
	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	-1388000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	5621000	USD
	us-gaap	Net Income Loss NetIncomeLoss	49146000	USD
	us-gaap	Net Income Loss NetIncomeLoss	42589000	USD
CY2020Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16533748	shares
CY2019Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16403776	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16466106	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16396646	shares
CY2020Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	16592842	shares
CY2019Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	16453867	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	16523200	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	16444231	shares
CY2020Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.56
CY2019Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.38
	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	2.97
	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	2.68
CY2020Q3	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Basic Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare	0
CY2019Q3	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Basic Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare	-0.04
	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Basic Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare	0.01
	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Basic Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare	-0.08
CY2020Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.56
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.34
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.98
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.60
CY2020Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.56
CY2019Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.38
	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	2.96
	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	2.67
CY2020Q3	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Diluted Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare	0
CY2019Q3	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Diluted Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare	-0.04
	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Diluted Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare	0.01
	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Diluted Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare	-0.08
CY2020Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.56
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.34
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.97
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.59
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	5621000	USD
	us-gaap	Net Income Loss NetIncomeLoss	49146000	USD
	us-gaap	Net Income Loss NetIncomeLoss	42589000	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
CY2019Q3	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	-43000	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
CY2019Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	-34000	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
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	-275000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	740000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	324000	USD
	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	2450000	USD
	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	1193000	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	-10000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	833000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	344000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	2638000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	1425000	USD
CY2020Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	10094000	USD
CY2019Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	5965000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	51784000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	44014000	USD
CY2020Q3	us-gaap	Public Utilities Property Plant And Equipment Plant In Service PublicUtilitiesPropertyPlantAndEquipmentPlantInService	1564420000	USD
CY2019Q4	us-gaap	Public Utilities Property Plant And Equipment Plant In Service PublicUtilitiesPropertyPlantAndEquipmentPlantInService	1441473000	USD
CY2020Q3	cpk	Unregulated Energy Property Plant And Equipment UnregulatedEnergyPropertyPlantAndEquipment	278897000	USD
CY2019Q4	cpk	Unregulated Energy Property Plant And Equipment UnregulatedEnergyPropertyPlantAndEquipment	265209000	USD
CY2020Q3	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	30365000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	39850000	USD
CY2020Q3	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	1873682000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	1746532000	USD
CY2020Q3	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	358851000	USD
CY2019Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	336876000	USD
CY2020Q3	cpk	Construction Workin Progress ConstructionWorkinProgress	52519000	USD
CY2019Q4	cpk	Construction Workin Progress ConstructionWorkinProgress	54141000	USD
CY2020Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1567350000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1463797000	USD
CY2020Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	3056000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	6985000	USD
CY2020Q3	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	53132000	USD
CY2019Q4	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	50899000	USD
CY2020Q3	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	4130000	USD
CY2019Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	1337000	USD
CY2020Q3	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	49002000	USD
CY2019Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	49562000	USD
CY2020Q3	cpk	Accrued Revenue AccruedRevenue	11545000	USD
CY2019Q4	cpk	Accrued Revenue AccruedRevenue	20846000	USD
CY2020Q3	us-gaap	Energy Related Inventory Propane Gas EnergyRelatedInventoryPropaneGas	4099000	USD
CY2019Q4	us-gaap	Energy Related Inventory Propane Gas EnergyRelatedInventoryPropaneGas	5824000	USD
CY2020Q3	us-gaap	Other Inventory OtherInventory	5583000	USD
CY2019Q4	us-gaap	Other Inventory OtherInventory	6067000	USD
CY2020Q3	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	10372000	USD
CY2019Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	5144000	USD
CY2020Q3	us-gaap	Energy Related Inventory Natural Gas In Storage EnergyRelatedInventoryNaturalGasInStorage	2971000	USD
CY2019Q4	us-gaap	Energy Related Inventory Natural Gas In Storage EnergyRelatedInventoryNaturalGasInStorage	3541000	USD
CY2020Q3	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	15156000	USD
CY2019Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	20050000	USD
CY2020Q3	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	14817000	USD
CY2019Q4	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	13928000	USD
CY2020Q3	us-gaap	Energy Marketing Contracts Assets Current EnergyMarketingContractsAssetsCurrent	1967000	USD
CY2019Q4	us-gaap	Energy Marketing Contracts Assets Current EnergyMarketingContractsAssetsCurrent	0	USD
CY2020Q3	us-gaap	Other Assets Current OtherAssetsCurrent	753000	USD
CY2019Q4	us-gaap	Other Assets Current OtherAssetsCurrent	2879000	USD
CY2020Q3	us-gaap	Assets Current AssetsCurrent	119321000	USD
CY2019Q4	us-gaap	Assets Current AssetsCurrent	134826000	USD
CY2020Q3	us-gaap	Goodwill Goodwill	36930000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	32668000	USD
CY2020Q3	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	7215000	USD
CY2019Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	8129000	USD
CY2020Q3	us-gaap	Investments Fair Value Disclosure InvestmentsFairValueDisclosure	9680000	USD
CY2019Q4	us-gaap	Investments Fair Value Disclosure InvestmentsFairValueDisclosure	9229000	USD
CY2020Q3	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	11077000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	11563000	USD
CY2020Q3	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	112650000	USD
CY2019Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	73407000	USD
CY2020Q3	cpk	Receivables And Other Deferred Charges ReceivablesAndOtherDeferredCharges	23865000	USD
CY2019Q4	cpk	Receivables And Other Deferred Charges ReceivablesAndOtherDeferredCharges	49579000	USD
CY2020Q3	cpk	Deferred Charges And Other Assets DeferredChargesAndOtherAssets	201417000	USD
CY2019Q4	cpk	Deferred Charges And Other Assets DeferredChargesAndOtherAssets	184575000	USD
CY2020Q3	us-gaap	Assets Assets	1888088000	USD
CY2019Q4	us-gaap	Assets Assets	1783198000	USD
CY2020Q3	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2019Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2020Q3	us-gaap	Common Stock Value CommonStockValue	8126000	USD
CY2019Q4	us-gaap	Common Stock Value CommonStockValue	7984000	USD
CY2020Q3	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	283836000	USD
CY2019Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	259253000	USD
CY2020Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	328357000	USD
CY2019Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	300607000	USD
CY2019Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	45600000	USD
CY2020Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-3629000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-6267000	USD
CY2020Q3	us-gaap	Compensation And Benefits Trust CompensationAndBenefitsTrust	5634000	USD
CY2019Q4	us-gaap	Compensation And Benefits Trust CompensationAndBenefitsTrust	4543000	USD
CY2020Q3	us-gaap	Treasury Stock Value TreasuryStockValue	5634000	USD
CY2019Q4	us-gaap	Treasury Stock Value TreasuryStockValue	4543000	USD
CY2020Q3	us-gaap	Stockholders Equity StockholdersEquity	616690000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	561577000	USD
CY2020Q3	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	519971000	USD
CY2019Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	440168000	USD
CY2020Q3	us-gaap	Capitalization Longterm Debt And Equity CapitalizationLongtermDebtAndEquity	1136661000	USD
CY2019Q4	us-gaap	Capitalization Longterm Debt And Equity CapitalizationLongtermDebtAndEquity	1001745000	USD
CY2020Q3	us-gaap	Long Term Debt Current LongTermDebtCurrent	15600000	USD
CY2020Q3	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	18531000	USD
CY2020Q3	us-gaap	Short Term Borrowings ShortTermBorrowings	216388000	USD
CY2019Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	247371000	USD
CY2020Q3	us-gaap	Accounts Payable Current AccountsPayableCurrent	46492000	USD
CY2019Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	54068000	USD
CY2020Q3	us-gaap	Contract With Customer Refund Liability Current ContractWithCustomerRefundLiabilityCurrent	32635000	USD
CY2019Q4	us-gaap	Contract With Customer Refund Liability Current ContractWithCustomerRefundLiabilityCurrent	30939000	USD
CY2020Q3	us-gaap	Interest Payable Current InterestPayableCurrent	5231000	USD
CY2019Q4	us-gaap	Interest Payable Current InterestPayableCurrent	2554000	USD
CY2020Q3	us-gaap	Dividends Payable Current DividendsPayableCurrent	7293000	USD
CY2019Q4	us-gaap	Dividends Payable Current DividendsPayableCurrent	6644000	USD
CY2020Q3	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	10903000	USD
CY2019Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	16236000	USD
CY2020Q3	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	6460000	USD
CY2019Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	5991000	USD
CY2020Q3	us-gaap	Energy Marketing Contract Liabilities Current EnergyMarketingContractLiabilitiesCurrent	439000	USD
CY2019Q4	us-gaap	Energy Marketing Contract Liabilities Current EnergyMarketingContractLiabilitiesCurrent	1844000	USD
CY2020Q3	us-gaap	Accrued Environmental Loss Contingencies Noncurrent AccruedEnvironmentalLossContingenciesNoncurrent	4447000	USD
CY2019Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	12077000	USD
CY2020Q3	us-gaap	Liabilities Current LiabilitiesCurrent	359972000	USD
CY2019Q4	us-gaap	Liabilities Current LiabilitiesCurrent	423324000	USD
CY2020Q3	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	202649000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	180656000	USD
CY2020Q3	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	142280000	USD
CY2019Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	127744000	USD
CY2019Q4	us-gaap	Accrued Environmental Loss Contingencies Noncurrent AccruedEnvironmentalLossContingenciesNoncurrent	6468000	USD
CY2020Q3	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	27462000	USD
CY2019Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	30569000	USD
CY2020Q3	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	9681000	USD
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	9896000	USD
CY2020Q3	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	4936000	USD
CY2019Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	2796000	USD
CY2020Q3	us-gaap	Deferred Credits And Other Liabilities DeferredCreditsAndOtherLiabilities	391455000	USD
CY2019Q4	us-gaap	Deferred Credits And Other Liabilities DeferredCreditsAndOtherLiabilities	358129000	USD
CY2020Q3	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2019Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2020Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1888088000	USD
CY2019Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1783198000	USD
	us-gaap	Net Income Loss NetIncomeLoss	49146000	USD
	us-gaap	Net Income Loss NetIncomeLoss	42589000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	42793000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	34049000	USD
	cpk	Depreciation And Accretion Included In Other Costs DepreciationAndAccretionIncludedInOtherCosts	7062000	USD
	cpk	Depreciation And Accretion Included In Other Costs DepreciationAndAccretionIncludedInOtherCosts	6380000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	22184000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	8789000	USD
	cpk	Discontinued Operation Gain Lossfrom Disposalof Discontinued Operationbefore Income Tax Incremental DiscontinuedOperationGainLossfromDisposalofDiscontinuedOperationbeforeIncomeTaxIncremental	200000	USD
	cpk	Discontinued Operation Gain Lossfrom Disposalof Discontinued Operationbefore Income Tax Incremental DiscontinuedOperationGainLossfromDisposalofDiscontinuedOperationbeforeIncomeTaxIncremental	0	USD
	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	4876000	USD
	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	1087000	USD
	us-gaap	Unrealized Gain Loss On Commodity Contracts UnrealizedGainLossOnCommodityContracts	432000	USD
	us-gaap	Unrealized Gain Loss On Commodity Contracts UnrealizedGainLossOnCommodityContracts	1025000	USD
	us-gaap	Employee Benefits And Share Based Compensation EmployeeBenefitsAndShareBasedCompensation	32000	USD
	us-gaap	Employee Benefits And Share Based Compensation EmployeeBenefitsAndShareBasedCompensation	1163000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	3654000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	2305000	USD
	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-10255000	USD
	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-51997000	USD
	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-2824000	USD
	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-7996000	USD
	us-gaap	Increase Decrease In Regulatory Assets And Liabilities IncreaseDecreaseInRegulatoryAssetsAndLiabilities	2284000	USD
	us-gaap	Increase Decrease In Regulatory Assets And Liabilities IncreaseDecreaseInRegulatoryAssetsAndLiabilities	7160000	USD
	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-1135000	USD
	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-13959000	USD
	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-924000	USD
	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-51550000	USD
	us-gaap	Increase Decrease In Income Taxes Receivable IncreaseDecreaseInIncomeTaxesReceivable	6809000	USD
	us-gaap	Increase Decrease In Income Taxes Receivable IncreaseDecreaseInIncomeTaxesReceivable	-4200000	USD
	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	1572000	USD
	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	-2992000	USD
	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	-5506000	USD
	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	-3747000	USD
	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	3746000	USD
	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	1927000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	115880000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	103939000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	123421000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	139315000	USD
	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	4320000	USD
	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	327000	USD
	us-gaap	Payments To Acquire Businesses Gross PaymentsToAcquireBusinessesGross	15629000	USD
	us-gaap	Payments To Acquire Businesses Gross PaymentsToAcquireBusinessesGross	0	USD
	cpk	Proceedsfrom Divestitureof Businesses Incremental ProceedsfromDivestitureofBusinessesIncremental	200000	USD
	cpk	Proceedsfrom Divestitureof Businesses Incremental ProceedsfromDivestitureofBusinessesIncremental	0	USD
	cpk	Payments For Environmental Expenditures PaymentsForEnvironmentalExpenditures	2021000	USD
	cpk	Payments For Environmental Expenditures PaymentsForEnvironmentalExpenditures	925000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-136551000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-139913000	USD
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	20044000	USD
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	18235000	USD
	us-gaap	Proceeds From Issuance Or Sale Of Equity ProceedsFromIssuanceOrSaleOfEquity	19731000	USD
	us-gaap	Proceeds From Issuance Or Sale Of Equity ProceedsFromIssuanceOrSaleOfEquity	-536000	USD
	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	977000	USD
	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	692000	USD
	us-gaap	Increase Decrease In Outstanding Checks Financing Activities IncreaseDecreaseInOutstandingChecksFinancingActivities	-2310000	USD
	us-gaap	Increase Decrease In Outstanding Checks Financing Activities IncreaseDecreaseInOutstandingChecksFinancingActivities	-2406000	USD
	us-gaap	Proceeds From Repayments Of Lines Of Credit ProceedsFromRepaymentsOfLinesOfCredit	-29385000	USD
	us-gaap	Proceeds From Repayments Of Lines Of Credit ProceedsFromRepaymentsOfLinesOfCredit	-67308000	USD
	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	89827000	USD
	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	129817000	USD
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	40100000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	16742000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	34205000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-3929000	USD
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	6435000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-1769000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	6985000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	6089000	USD
CY2020Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	3056000	USD
CY2019Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	4320000	USD
CY2019Q2	us-gaap	Stockholders Equity StockholdersEquity	544384000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	5621000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	344000	USD
CY2019Q3	us-gaap	Dividends Dividends	6689000	USD
CY2019Q3	cpk	Stock Issued During The Period Value Retirement Savings Plan And Dividend Reinvestment Plan StockIssuedDuringThePeriodValueRetirementSavingsPlanAndDividendReinvestmentPlan	-1000	USD
CY2019Q3	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	1052000	USD
CY2019Q3	us-gaap	Stockholders Equity StockholdersEquity	544711000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	518439000	USD
	us-gaap	Net Income Loss NetIncomeLoss	42589000	USD
	us-gaap	New Accounting Pronouncement Or Change In Accounting Principle Effect Of Adoption Quantification NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfAdoptionQuantification	0	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	1425000	USD
	us-gaap	Dividends Dividends	19540000	USD
	cpk	Stock Issued During The Period Value Retirement Savings Plan And Dividend Reinvestment Plan StockIssuedDuringThePeriodValueRetirementSavingsPlanAndDividendReinvestmentPlan	-3000	USD
	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	1801000	USD
	cpk	Treasury Stock Activity And Deferred Compensation Plan Activity During Period Value TreasuryStockActivityAndDeferredCompensationPlanActivityDuringPeriodValue	0	USD
CY2019Q3	us-gaap	Stockholders Equity StockholdersEquity	544711000	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	cpk	Treasury Stock Activity And Deferred Compensation Plan Activity During Period Value TreasuryStockActivityAndDeferredCompensationPlanActivityDuringPeriodValue	0	USD
CY2019Q4	cpk	Shares Held In Trust For Deferred Compensation Plan SharesHeldInTrustForDeferredCompensationPlan	95329	shares
CY2019Q3	cpk	Shares Held In Trust For Deferred Compensation Plan SharesHeldInTrustForDeferredCompensationPlan	94923	shares
CY2020Q3	us-gaap	Stockholders Equity StockholdersEquity	616690000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	561577000	USD
	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
CY2020Q3	us-gaap	Stockholders Equity StockholdersEquity	616690000	USD
CY2020Q3	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	2000000	shares
CY2020Q3	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2020Q3	cpk	Shares Held In Trust For Deferred Compensation Plan SharesHeldInTrustForDeferredCompensationPlan	104119	shares
CY2018Q4	cpk	Shares Held In Trust For Deferred Compensation Plan SharesHeldInTrustForDeferredCompensationPlan	97053	shares
	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	7635	shares
	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Basic Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare	0.01
CY2020Q3	cpk	Numberof Disposal Transactions NumberofDisposalTransactions	4
CY2019Q4	cpk	Accounts Receivable Allowancefor Credit Losses Current Disclosure AccountsReceivableAllowanceforCreditLossesCurrentDisclosure	1337000	USD
	us-gaap	Provision For Other Credit Losses ProvisionForOtherCreditLosses	2810000	USD
	us-gaap	Allowance For Doubtful Accounts Receivable Recoveries AllowanceForDoubtfulAccountsReceivableRecoveries	577000	USD
	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	594000	USD
CY2020Q3	cpk	Accounts Receivable Allowancefor Credit Losses Current Disclosure AccountsReceivableAllowanceforCreditLossesCurrentDisclosure	4130000	USD
	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Basic Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare	-0.08
CY2020Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.56
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.34
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.98
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.60
CY2020Q3	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	-19000	USD
CY2019Q3	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Basic Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare	-0.04
CY2019Q3	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	-630000	USD
	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	165000	USD
	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	-1388000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	9261000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	5621000	USD
	us-gaap	Net Income Loss NetIncomeLoss	49146000	USD
	us-gaap	Net Income Loss NetIncomeLoss	42589000	USD
CY2020Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16533748	shares
CY2019Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16403776	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16466106	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16396646	shares
CY2020Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.56
CY2019Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.38
	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	2.97
	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	2.68
CY2020Q3	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Basic Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare	0
CY2020Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16533748	shares
CY2019Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16403776	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16466106	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16396646	shares
CY2020Q3	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	59094	shares
CY2019Q3	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	50091	shares
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	57094	shares
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	47585	shares
CY2020Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	16592842	shares
CY2019Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	16453867	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	16523200	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	16444231	shares
CY2020Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.56
CY2019Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.38
	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	2.96
	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	2.67
CY2020Q3	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Diluted Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare	0
	us-gaap	Disposal Group Including Discontinued Operation Depreciation And Amortization DisposalGroupIncludingDiscontinuedOperationDepreciationAndAmortization	437000	USD
CY2020Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	101419000	USD
CY2019Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	92626000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	351160000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	347630000	USD
CY2019Q3	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Diluted Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare	-0.04
	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Diluted Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare	0.01
	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Diluted Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare	-0.08
CY2020Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.56
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.34
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.97
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.59
	cpk	Numberof Disposal Transactions NumberofDisposalTransactions	4
	us-gaap	Proceeds From Divestiture Of Businesses ProceedsFromDivestitureOfBusinesses	23100000	USD
	us-gaap	Discontinued Operation Gain Loss From Disposal Of Discontinued Operation Before Income Tax DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax	7500000	USD
	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	5400000	USD
CY2020Q3	us-gaap	Discontinued Operation Gain Loss From Disposal Of Discontinued Operation Before Income Tax DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax	7300000	USD
CY2019Q4	us-gaap	Receivables From Customers ReceivablesFromCustomers	47430000	USD
CY2019Q4	us-gaap	Contract With Customer Asset Net Current ContractWithCustomerAssetNetCurrent	18000	USD
CY2019Q4	us-gaap	Contract With Customer Asset Net Noncurrent ContractWithCustomerAssetNetNoncurrent	3465000	USD
CY2019Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	589000	USD
CY2020Q3	us-gaap	Receivables From Customers ReceivablesFromCustomers	37190000	USD
CY2020Q3	us-gaap	Contract With Customer Asset Net Current ContractWithCustomerAssetNetCurrent	18000	USD
CY2020Q3	us-gaap	Contract With Customer Asset Net Noncurrent ContractWithCustomerAssetNetNoncurrent	4537000	USD
CY2020Q3	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	971000	USD
	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	-10240000	USD
	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	0	USD
	us-gaap	Increase Decrease In Other Noncurrent Assets IncreaseDecreaseInOtherNoncurrentAssets	1072000	USD
	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	382000	USD
CY2020Q3	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	200000	USD
	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	800000	USD
	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	700000	USD
	cpk	Regulatory Asset Storm Cost Recovery RegulatoryAssetStormCostRecovery	45800000	USD
CY2019Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-5403000	USD
CY2020Q3	cpk	Minimum Interest Coverage Ratio Under Agreement Two MinimumInterestCoverageRatioUnderAgreementTwo	2
	cpk	Surcharge Storm Cost Recovery SurchargeStormCostRecovery	7700000	USD
	cpk	Incremental Revenue Storm Cost Recovery IncrementalRevenueStormCostRecovery	3300000	USD
	cpk	Companys Exposure In Number Of Former Manufactured Gas Plant Sites CompanysExposureInNumberOfFormerManufacturedGasPlantSites	7	site
CY2020Q3	cpk	Debt Service Coverage Ratio DebtServiceCoverageRatio	1.25
CY2020Q3	cpk	Debt Service Coverage Ratio Measurement Period DebtServiceCoverageRatioMeasurementPeriod	12
	cpk	Ratiobasedonaveragenumberofpriorquarters Ratiobasedonaveragenumberofpriorquarters	6
CY2020Q3	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
CY2020Q3	us-gaap	Guarantee Obligations Maximum Exposure GuaranteeObligationsMaximumExposure	20000000.0	USD
CY2020Q3	us-gaap	Guarantee Obligations Current Carrying Value GuaranteeObligationsCurrentCarryingValue	7900000	USD
	cpk	Standby Letters Of Credit StandbyLettersOfCredit	4800000	USD
	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	2
CY2020Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	17406000	USD
CY2019Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	14357000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	77518000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	76645000	USD
CY2020Q3	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-40000	USD
CY2019Q3	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-351000	USD
	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	2997000	USD
	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-731000	USD
CY2020Q3	us-gaap	Interest Expense InterestExpense	4584000	USD
CY2019Q3	us-gaap	Interest Expense InterestExpense	5403000	USD
	us-gaap	Interest Expense InterestExpense	15452000	USD
	us-gaap	Interest Expense InterestExpense	16583000	USD
CY2020Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	12782000	USD
CY2019Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	8603000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	65063000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	59331000	USD
CY2020Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3502000	USD
CY2019Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	2352000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	16082000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	15354000	USD
CY2020Q3	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	-19000	USD
CY2019Q3	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	-630000	USD
	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	165000	USD
	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	-1388000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	9261000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	5621000	USD
	us-gaap	Net Income Loss NetIncomeLoss	49146000	USD
	us-gaap	Net Income Loss NetIncomeLoss	42589000	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
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-6713000	USD
CY2020Q3	cpk	Common Stock Shares Issued At The Market CommonStockSharesIssuedAtTheMarket	100000	shares
CY2020Q3	cpk	Shares Issued Price Per Share At The Market SharesIssuedPricePerShareAtTheMarket	83.21
CY2020Q3	cpk	Proceeds From Issuance Of Common Stock At The Market ProceedsFromIssuanceOfCommonStockAtTheMarket	10200000	USD
CY2020Q3	cpk	Fees On Equity Issuance At The Market FeesOnEquityIssuanceAtTheMarket	400000	USD
CY2020Q3	us-gaap	Stock Issued During Period Shares Dividend Reinvestment Plan StockIssuedDuringPeriodSharesDividendReinvestmentPlan	100000	shares
CY2020Q3	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	84.90	USD
CY2020Q3	us-gaap	Proceeds From Issuance Of Common Stock Dividend Reinvestment Plan ProceedsFromIssuanceOfCommonStockDividendReinvestmentPlan	9000000.0	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	1700000	USD
	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	275000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	1425000	USD
CY2020Q3	us-gaap	Defined Benefit Plan Amortization Of Prior Service Cost Credit DefinedBenefitPlanAmortizationOfPriorServiceCostCredit	-19000	USD
CY2019Q3	us-gaap	Defined Benefit Plan Recognized Net Gain Loss Due To Settlements And Curtailments1 DefinedBenefitPlanRecognizedNetGainLossDueToSettlementsAndCurtailments1	58000	USD
	us-gaap	Defined Benefit Plan Recognized Net Gain Loss Due To Settlements And Curtailments1 DefinedBenefitPlanRecognizedNetGainLossDueToSettlementsAndCurtailments1	58000	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
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 Amounts Recognized Gain Loss DefinedBenefitPlanAmountsRecognizedGainLoss	198000	USD
CY2019Q3	us-gaap	Defined Benefit Plan Amortization Of Prior Service Cost Credit DefinedBenefitPlanAmortizationOfPriorServiceCostCredit	-19000	USD
CY2019Q3	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	-257000	USD
CY2019Q3	cpk	Defined Benefit Plan Amounts Recognized Gain Loss DefinedBenefitPlanAmountsRecognizedGainLoss	238000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	24000	USD
CY2019Q3	cpk	Defined Benefit Plan Amounts Recognized From Regulatory Asset DefinedBenefitPlanAmountsRecognizedFromRegulatoryAsset	104000	USD
CY2019Q3	cpk	Defined Benefit Plan Actuarial Gain Loss Net Settlement DefinedBenefitPlanActuarialGainLossNetSettlement	128000	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 Amounts Recognized Gain Loss DefinedBenefitPlanAmountsRecognizedGainLoss	594000	USD
	us-gaap	Defined Benefit Plan Amortization Of Prior Service Cost Credit DefinedBenefitPlanAmortizationOfPriorServiceCostCredit	-58000	USD
	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	-683000	USD
	cpk	Defined Benefit Plan Amounts Recognized Gain Loss DefinedBenefitPlanAmountsRecognizedGainLoss	625000	USD
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	312000	USD
	cpk	Defined Benefit Plan Amounts Recognized From Regulatory Asset DefinedBenefitPlanAmountsRecognizedFromRegulatoryAsset	313000	USD
	cpk	Defined Benefit Plan Amounts Recognized Gain Loss DefinedBenefitPlanAmountsRecognizedGainLoss	625000	USD
CY2020Q3	us-gaap	Investments Fair Value Disclosure InvestmentsFairValueDisclosure	9680000	USD
CY2019Q4	us-gaap	Investments Fair Value Disclosure InvestmentsFairValueDisclosure	9229000	USD
CY2020Q3	us-gaap	Trading Securities Unrealized Holding Gain Loss TradingSecuritiesUnrealizedHoldingGainLoss	600000	USD
CY2019Q3	us-gaap	Trading Securities Unrealized Holding Gain Loss TradingSecuritiesUnrealizedHoldingGainLoss	-100000	USD
	us-gaap	Trading Securities Unrealized Holding Gain Loss TradingSecuritiesUnrealizedHoldingGainLoss	400000	USD
	us-gaap	Trading Securities Unrealized Holding Gain Loss TradingSecuritiesUnrealizedHoldingGainLoss	1000000.0	USD
CY2020Q3	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	1332000	USD
CY2019Q3	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	1210000	USD
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	3654000	USD
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	2305000	USD
CY2020Q3	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	348000	USD
CY2019Q3	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	315000	USD
	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	955000	USD
	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	600000	USD
CY2020Q3	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	984000	USD
CY2019Q3	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	895000	USD
	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	2699000	USD
	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	1705000	USD
CY2020Q3	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	4900000	USD
	us-gaap	Notional Amount Of Nonderivative Instruments NotionalAmountOfNonderivativeInstruments	100000000.0	USD
CY2020Q3	cpk	Numberofshorttermlinesof Creditrateswap NumberofshorttermlinesofCreditrateswap	3
CY2020Q3	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	1209000	USD
CY2019Q3	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	767000	USD
CY2020Q3	us-gaap	Energy Marketing Contracts Assets Current EnergyMarketingContractsAssetsCurrent	1967000	USD
CY2019Q4	us-gaap	Energy Marketing Contracts Assets Current EnergyMarketingContractsAssetsCurrent	0	USD
CY2020Q3	us-gaap	Energy Marketing Contract Liabilities Current EnergyMarketingContractLiabilitiesCurrent	439000	USD
CY2019Q4	us-gaap	Energy Marketing Contract Liabilities Current EnergyMarketingContractLiabilitiesCurrent	1844000	USD
	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	4997000	USD
	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	2837000	USD
CY2020Q3	us-gaap	Energy Marketing Contracts Assets Current EnergyMarketingContractsAssetsCurrent	1967000	USD
CY2020Q3	us-gaap	Energy Marketing Contracts Assets Current EnergyMarketingContractsAssetsCurrent	1967000	USD
CY2020Q3	us-gaap	Energy Marketing Contract Liabilities Current EnergyMarketingContractLiabilitiesCurrent	439000	USD
CY2020Q3	us-gaap	Energy Marketing Contract Liabilities Current EnergyMarketingContractLiabilitiesCurrent	439000	USD
CY2019Q4	us-gaap	Energy Marketing Contracts Assets Current EnergyMarketingContractsAssetsCurrent	0	USD
CY2019Q4	us-gaap	Energy Marketing Contract Liabilities Current EnergyMarketingContractLiabilitiesCurrent	1844000	USD
CY2019Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	803000	USD
CY2018Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	686000	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 Purchases Sales Issuances Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements	123000	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 Transfers Out Of Level3 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3	0	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 Sales FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales	14000	USD
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings1 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1	-18000	USD
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings1 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1	-11000	USD
CY2020Q3	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	2129000	USD
CY2019Q3	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	806000	USD
CY2020Q3	us-gaap	Long Term Debt LongTermDebt	536500000	USD
CY2020Q3	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	567000000.0	USD
CY2019Q4	us-gaap	Long Term Debt LongTermDebt	486600000	USD
CY2019Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	505000000.0	USD
CY2020Q3	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	922000	USD
CY2019Q4	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	822000	USD
CY2020Q3	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	535571000	USD
CY2019Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	485768000	USD
CY2020Q3	us-gaap	Long Term Debt Current LongTermDebtCurrent	15600000	USD
CY2019Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	45600000	USD
CY2020Q3	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	519971000	USD
CY2019Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	440168000	USD
CY2020Q3	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	375000000.0	USD
	us-gaap	Line Of Credit Facility Commitment Fee Percentage LineOfCreditFacilityCommitmentFeePercentage	0.175
CY2020Q3	us-gaap	Debt Instrument Unused Borrowing Capacity Amount DebtInstrumentUnusedBorrowingCapacityAmount	310000000	USD
CY2020Q3	us-gaap	Short Term Borrowings ShortTermBorrowings	216400000	USD
CY2019Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	247400000	USD
CY2020Q3	us-gaap	Short Term Debt Weighted Average Interest Rate ShortTermDebtWeightedAverageInterestRate	0.0128
CY2019Q4	us-gaap	Short Term Debt Weighted Average Interest Rate ShortTermDebtWeightedAverageInterestRate	0.0262
CY2020Q3	us-gaap	Bank Overdrafts BankOverdrafts	900000	USD
CY2019Q4	us-gaap	Bank Overdrafts BankOverdrafts	3200000	USD
	us-gaap	Notional Amount Of Nonderivative Instruments NotionalAmountOfNonderivativeInstruments	100000000.0	USD
	us-gaap	Notional Amount Of Nonderivative Instruments NotionalAmountOfNonderivativeInstruments	100000000.0	USD
CY2020Q3	cpk	Numberofshorttermlinesof Creditrateswap NumberofshorttermlinesofCreditrateswap	3
CY2020Q3	us-gaap	Line Of Credit Facility Remaining Borrowing Capacity LineOfCreditFacilityRemainingBorrowingCapacity	154700000	USD
CY2020Q3	us-gaap	Ratio Of Indebtedness To Net Capital1 RatioOfIndebtednessToNetCapital1	0.65
	cpk	Effectof Cpi Basis Point Change EffectofCPIBasisPointChange	100
CY2020Q3	cpk	Minimum Renewal Term Lengthin Years Lessee MinimumRenewalTermLengthinYearsLessee	1	Y
CY2020Q3	cpk	Maximum Renewal Term Lengthin Years Lessee MaximumRenewalTermLengthinYearsLessee	25	Y
CY2020Q3	us-gaap	Operating Lease Cost OperatingLeaseCost	627000	USD
CY2019Q3	us-gaap	Operating Lease Cost OperatingLeaseCost	638000	USD
	us-gaap	Operating Lease Cost OperatingLeaseCost	1882000	USD
	us-gaap	Operating Lease Cost OperatingLeaseCost	1926000	USD
CY2020Q3	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	0	USD
	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	0	USD
	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	650000	USD
CY2020Q3	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	0	USD
	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	0	USD
	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	5000	USD
CY2020Q3	us-gaap	Lease Cost LeaseCost	627000	USD
CY2019Q3	us-gaap	Lease Cost LeaseCost	638000	USD
	us-gaap	Lease Cost LeaseCost	1882000	USD
	us-gaap	Lease Cost LeaseCost	2581000	USD
CY2020Q3	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	11077000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	11563000	USD
CY2020Q3	cpk	Total Financeand Operating Lease Rightof Use Asset TotalFinanceandOperatingLeaseRightofUseAsset	11077000	USD
CY2019Q4	cpk	Total Financeand Operating Lease Rightof Use Asset TotalFinanceandOperatingLeaseRightofUseAsset	11563000	USD
CY2020Q3	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	1733000	USD
CY2020Q3	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.038
CY2019Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	1705000	USD
CY2020Q3	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	9681000	USD
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	9896000	USD
CY2020Q3	cpk	Total Operatingand Finance Lease Liabilities TotalOperatingandFinanceLeaseLiabilities	11414000	USD
CY2019Q4	cpk	Total Operatingand Finance Lease Liabilities TotalOperatingandFinanceLeaseLiabilities	11601000	USD
CY2020Q3	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P8Y6M
CY2019Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P8Y10M17D
CY2019Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.038
	us-gaap	Operating Lease Payments OperatingLeasePayments	1435000	USD
	us-gaap	Operating Lease Payments OperatingLeasePayments	1580000	USD
	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	0	USD
	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	5000	USD
	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	0	USD
	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	650000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Remainder Of Fiscal Year LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear	602000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	1984000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	1939000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	1874000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	1619000	USD
CY2020Q3	cpk	Lessee Operating Lease Liability Payments Due Year Six LesseeOperatingLeaseLiabilityPaymentsDueYearSix	1383000	USD
CY2020Q3	cpk	Lessee Operating Lease Liability Payments Due After Year Six LesseeOperatingLeaseLiabilityPaymentsDueAfterYearSix	3876000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	13277000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	1863000	USD
CY2020Q3	us-gaap	Operating Lease Liability OperatingLeaseLiability	11414000	USD
CY2020Q3	cpk	Lessee Future Operating Lease Option Payments LesseeFutureOperatingLeaseOptionPayments	3900000	USD

Files In Submission

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$CPK
CHESAPEAKE UTILITIES CORP Stock $cpk

2020 Q4 Form 10-Q Financial Statement

#000162828020015567 Filed on November 05, 2020

Income Statement

Balance Sheet

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Files In Submission

$CPK CHESAPEAKE UTILITIES CORP Stock $cpk

2020 Q4 Form 10-Q Financial Statement

#000162828020015567 Filed on November 05, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CPK
CHESAPEAKE UTILITIES CORP Stock $cpk