$CPK
CHESAPEAKE UTILITIES CORP Stock $cpk

$cpk Overview Financials Valuation SEC Filings Company Website

2020 Q2 Form 10-Q Financial Statement

#000162828020011822 Filed on August 05, 2020

Income Statement

Concept	2020 Q2	2019 Q2	2019 Q1
Revenue	$97.05M	$94.54M	$160.5M
YoY Change	2.65%	0.71%	-4.96%
Cost Of Revenue	$23.00M	$25.20M	$60.90M
YoY Change	-8.73%	-162.84%	-58.88%
Gross Profit	$74.10M	$69.30M	$99.60M
YoY Change	6.93%	9.31%	9.09%
Gross Profit Margin	76.35%	73.3%	62.07%
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$12.20M	$11.61M	$11.07M
YoY Change	5.09%	17.99%	14.12%
% of Gross Profit	16.46%	16.75%	11.12%
Operating Expenses	$79.07M	$76.38M	$183.6M
YoY Change	3.53%	-38.11%	-7.7%
Operating Profit	$17.98M	$18.17M	$44.12M
YoY Change	-1.03%	48.43%	8.0%
Interest Expense	$5.054M	$5.552M	$5.628M
YoY Change	-8.97%	43.06%	53.6%
% of Operating Profit	28.11%	30.56%	12.76%
Other Income/Expense, Net	-$279.0K	-$320.0K	-$57.00K
YoY Change	-12.81%	22.14%	-183.82%
Pretax Income	$12.64M	$12.29M	$38.44M
YoY Change	2.86%	35.01%	4.43%
Income Tax	$1.983M	$3.379M	$9.625M
% Of Pretax Income	15.68%	27.49%	25.04%
Net Earnings	$8.304M	$8.304M	$28.66M
YoY Change	0.0%	30.05%	6.73%
Net Earnings / Revenue	8.56%	8.78%	17.86%
Basic Earnings Per Share	$0.51	$0.51	$1.75
Diluted Earnings Per Share	$0.50	$0.50	$1.74
COMMON SHARES
Basic Shares Outstanding	16.45M shares	16.40M shares	16.38M shares
Diluted Shares Outstanding	16.50M shares	16.45M shares	16.43M shares

Balance Sheet

Concept	2020 Q2	2019 Q2	2019 Q1
SHORT-TERM ASSETS
Cash & Short-Term Investments	$3.600M	$7.300M	$8.000M
YoY Change	-50.68%	62.22%	33.33%
Cash & Equivalents	$3.590M	$7.254M	$7.975M
Short-Term Investments
Other Short-Term Assets	$1.017M	$4.022M	$1.121M
YoY Change	-74.71%	-11.8%	-83.31%
Inventory	$11.30M	$17.10M	$16.30M
Prepaid Expenses	$9.167M	$5.873M	$7.192M
Receivables	$46.70M	$48.91M	$74.10M
Other Receivables	$9.800M	$11.00M	$9.100M
Total Short-Term Assets	$98.56M	$124.2M	$153.6M
YoY Change	-20.67%	7.07%	11.47%
LONG-TERM ASSETS
Property, Plant & Equipment	$1.525B	$1.421B	$1.395B
YoY Change	7.34%	15.09%	18.58%
Goodwill	$32.68M	$25.79M	$25.79M
YoY Change	26.76%	31.53%	16.65%
Intangibles	$7.520M	$5.611M	$5.909M
YoY Change	34.02%	31.19%	31.84%
Long-Term Investments	$9.600M	$8.800M	$7.500M
YoY Change	9.09%	17.33%	13.64%
Other Assets	$74.80M	$76.90M	$77.10M
YoY Change	-2.73%	0.65%	2.12%
Total Long-Term Assets	$1.724B	$1.557B	$1.529B
YoY Change	10.72%	15.58%	18.57%
TOTAL ASSETS
Total Short-Term Assets	$98.56M	$124.2M	$153.6M
Total Long-Term Assets	$1.724B	$1.557B	$1.529B
Total Assets	$1.822B	$1.681B	$1.683B
YoY Change	8.4%	14.91%	17.89%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$46.38M	$50.65M	$75.28M
YoY Change	-8.42%	-16.66%	31.01%
Accrued Expenses	$32.40M	$27.30M	$27.70M
YoY Change	18.68%	28.17%	59.2%
Deferred Revenue	$347.0K	$316.0K	$305.0K
YoY Change	9.81%	80.57%	25.0%
Short-Term Debt	$286.4M	$301.2M	$276.4M
YoY Change	-4.92%	28.02%	20.64%
Long-Term Debt Due	$15.60M	$75.60M	$71.51M
YoY Change	-79.37%	657.74%	661.63%
Total Short-Term Liabilities	$429.8M	$512.4M	$508.6M
YoY Change	-16.12%	31.89%	35.86%
LONG-TERM LIABILITIES
Long-Term Debt	$430.1M	$275.9M	$286.0M
YoY Change	55.88%	14.21%	28.82%
Other Long-Term Liabilities	$2.434M	$2.661M	$2.908M
YoY Change	-8.53%	-14.05%	-50.26%
Total Long-Term Liabilities	$432.5M	$278.6M	$288.9M
YoY Change	55.26%	13.85%	26.79%
TOTAL LIABILITIES
Total Short-Term Liabilities	$429.8M	$512.4M	$508.6M
Total Long-Term Liabilities	$432.5M	$278.6M	$288.9M
Total Liabilities	$862.4M	$791.0M	$797.5M
YoY Change	9.02%	24.92%	32.43%
SHAREHOLDERS EQUITY
Retained Earnings	$326.5M	$285.8M	$284.1M
YoY Change	14.24%	14.13%	13.63%
Common Stock	$271.3M	$264.4M	$263.3M
YoY Change	2.62%	0.4%	0.46%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$5.659M	$4.694M	$4.376M
YoY Change	20.56%	24.11%	22.47%
Treasury Stock Shares
Shareholders Equity	$593.3M	$544.4M	$543.7M
YoY Change
Total Liabilities & Shareholders Equity	$1.822B	$1.681B	$1.683B
YoY Change	8.4%	14.91%	17.89%

Cashflow Statement

Concept	2020 Q2	2019 Q2	2019 Q1
OPERATING ACTIVITIES
Net Income	$8.304M	$8.304M	$28.66M
YoY Change	0.0%	30.05%	6.73%
Depreciation, Depletion And Amortization	$12.20M	$11.61M	$11.07M
YoY Change	5.09%	17.99%	14.12%
Cash From Operating Activities	$32.90M	$34.10M	$40.49M
YoY Change	-3.52%	-18.23%	-39.28%
INVESTING ACTIVITIES
Capital Expenditures	-$47.60M	-$47.20M	$43.22M
YoY Change	0.85%	-25.9%	-31.53%
Acquisitions
YoY Change
Other Investing Activities	-$1.200M	-$200.0K	-$200.0K
YoY Change	500.0%	-300.0%	-300.0%
Cash From Investing Activities	-$48.80M	-$47.50M	-$43.37M
YoY Change	2.74%	-25.43%	-31.13%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net			$414.0K
YoY Change			-3.27%
Cash From Financing Activities	15.50M	12.70M	$4.769M
YoY Change	22.05%	-38.05%	-243.69%
NET CHANGE
Cash From Operating Activities	32.90M	34.10M	$40.49M
Cash From Investing Activities	-48.80M	-47.50M	-$43.37M
Cash From Financing Activities	15.50M	12.70M	$4.769M
Net Change In Cash	-400.0K	-700.0K	$1.886M
YoY Change	-42.86%	-53.33%	393.72%
FREE CASH FLOW
Cash From Operating Activities	$32.90M	$34.10M	$40.49M
Capital Expenditures	-$47.60M	-$47.20M	$43.22M
Free Cash Flow	$80.50M	$81.30M	-$2.730M
YoY Change	-0.98%	-22.87%	-176.77%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
	cpk	Maximum Days To Make Default Good MaximumDaysToMakeDefaultGood	P5D
CY2019Q2	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	0	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	-14000	USD
	cpk	Ratiosbasedonaverageofthepriorquarters Ratiosbasedonaverageofthepriorquarters	P1Y6M
	dei	Amendment Flag AmendmentFlag	false
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q2
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2020
	dei	Entity Central Index Key EntityCentralIndexKey	0000019745
	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2020Q2	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.8450
CY2020Q2	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P1Y
CY2020Q2	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P1Y
	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
	dei	Entity Registrant Name EntityRegistrantName	CHESAPEAKE UTILITIES CORP
	dei	Entity Small Business EntitySmallBusiness	false
	dei	Security Exchange Name SecurityExchangeName	NYSE
CY2019Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.3700
CY2019Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.4050
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.7750
CY2020Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.4050
CY2020Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.4400
CY2019Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.4867
CY2020Q2	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.4867
CY2019Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	50000000	shares
CY2020Q2	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	50000000	shares
CY2019Q2	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
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
CY2019Q2	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax	-42000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax	-86000	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	-55000	USD
CY2019Q2	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	-850000	USD
	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	343000	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	653000	USD
CY2019Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2019Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	2000000	shares
CY2019Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2020Q2	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P1Y
CY2020Q2	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P1Y
CY2020Q2	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P1Y
CY2020Q2	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P1Y
CY2020Q2	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1
	dei	Document Type DocumentType	10-Q
	cpk	Unregulated Energy And Other Cost Of Sales UnregulatedEnergyAndOtherCostOfSales	24609000	USD
	dei	Document Quarterly Report DocumentQuarterlyReport	true
	dei	Document Period End Date DocumentPeriodEndDate	2020-06-30
	dei	Document Transition Report DocumentTransitionReport	false
	dei	Entity File Number EntityFileNumber	001-11590
	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	51-0064146
	dei	Entity Address Address Line1 EntityAddressAddressLine1	909 Silver Lake Boulevard
	dei	Entity Address City Or Town EntityAddressCityOrTown	Dover
	dei	Entity Address State Or Province EntityAddressStateOrProvince	DE
	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	19904
	dei	City Area Code CityAreaCode	302
	dei	Local Phone Number LocalPhoneNumber	734-6799
	dei	Security12b Title Security12bTitle	Common Stock - par value per share $0.4867
	dei	Trading Symbol TradingSymbol	CPK
	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
	dei	Entity Small Business EntitySmallBusiness	false
	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
	dei	Entity Shell Company EntityShellCompany	false
CY2020Q3	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	16493573	shares
CY2020Q2	us-gaap	Regulated Operating Revenue RegulatedOperatingRevenue	73518000	USD
CY2019Q2	us-gaap	Regulated Operating Revenue RegulatedOperatingRevenue	73403000	USD
	us-gaap	Regulated Operating Revenue RegulatedOperatingRevenue	176473000	USD
	us-gaap	Regulated Operating Revenue RegulatedOperatingRevenue	177021000	USD
CY2020Q2	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	23533000	USD
CY2019Q2	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	21139000	USD
	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	73268000	USD
	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	77984000	USD
CY2020Q2	us-gaap	Revenues Revenues	97051000	USD
CY2019Q2	us-gaap	Revenues Revenues	94542000	USD
	us-gaap	Revenues Revenues	249741000	USD
	us-gaap	Revenues Revenues	255005000	USD
CY2020Q2	cpk	Regulated Energy Cost Of Sales RegulatedEnergyCostOfSales	16387000	USD
CY2019Q2	cpk	Regulated Energy Cost Of Sales RegulatedEnergyCostOfSales	18317000	USD
	cpk	Regulated Energy Cost Of Sales RegulatedEnergyCostOfSales	51219000	USD
	cpk	Regulated Energy Cost Of Sales RegulatedEnergyCostOfSales	54833000	USD
CY2020Q2	cpk	Unregulated Energy And Other Cost Of Sales UnregulatedEnergyAndOtherCostOfSales	6573000	USD
CY2019Q2	cpk	Unregulated Energy And Other Cost Of Sales UnregulatedEnergyAndOtherCostOfSales	6857000	USD
	cpk	Unregulated Energy And Other Cost Of Sales UnregulatedEnergyAndOtherCostOfSales	31267000	USD
CY2020Q2	cpk	Operations Operations	34607000	USD
CY2019Q2	cpk	Operations Operations	31531000	USD
CY2019Q2	us-gaap	Operating Expenses OperatingExpenses	76377000	USD
	cpk	Operations Operations	70559000	USD
	us-gaap	Operating Expenses OperatingExpenses	189630000	USD
	us-gaap	Operating Expenses OperatingExpenses	192718000	USD
	cpk	Operations Operations	66945000	USD
CY2020Q2	us-gaap	Operating Costs And Expenses OperatingCostsAndExpenses	4143000	USD
CY2019Q2	us-gaap	Operating Costs And Expenses OperatingCostsAndExpenses	3600000	USD
	us-gaap	Operating Costs And Expenses OperatingCostsAndExpenses	7979000	USD
	us-gaap	Operating Costs And Expenses OperatingCostsAndExpenses	7280000	USD
CY2020Q2	cpk	Settlement Gain SettlementGain	130000	USD
CY2019Q2	cpk	Settlement Gain SettlementGain	130000	USD
	cpk	Settlement Gain SettlementGain	130000	USD
	cpk	Settlement Gain SettlementGain	130000	USD
CY2020Q2	cpk	Depreciationand Amortization Costs DepreciationandAmortizationCosts	12247000	USD
CY2019Q2	cpk	Depreciationand Amortization Costs DepreciationandAmortizationCosts	11464000	USD
	cpk	Depreciationand Amortization Costs DepreciationandAmortizationCosts	24500000	USD
	cpk	Depreciationand Amortization Costs DepreciationandAmortizationCosts	22392000	USD
CY2020Q2	us-gaap	Taxes Other TaxesOther	5247000	USD
CY2019Q2	us-gaap	Taxes Other TaxesOther	4738000	USD
	us-gaap	Taxes Other TaxesOther	10894000	USD
	us-gaap	Taxes Other TaxesOther	10131000	USD
CY2020Q2	us-gaap	Operating Expenses OperatingExpenses	79074000	USD
CY2020Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	17977000	USD
CY2019Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	18165000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	60111000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	62287000	USD
CY2020Q2	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-279000	USD
CY2019Q2	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-320000	USD
	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	3039000	USD
	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-380000	USD
CY2020Q2	us-gaap	Interest Expense InterestExpense	5054000	USD
CY2019Q2	us-gaap	Interest Expense InterestExpense	5552000	USD
	us-gaap	Interest Expense InterestExpense	10868000	USD
	us-gaap	Interest Expense InterestExpense	11180000	USD
CY2020Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	12644000	USD
CY2019Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	12293000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	52282000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	50727000	USD
CY2020Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1983000	USD
CY2019Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3379000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	12580000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	13002000	USD
CY2020Q2	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	295000	USD
CY2019Q2	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	-610000	USD
	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	184000	USD
	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	-757000	USD
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	8304000	USD
	us-gaap	Net Income Loss NetIncomeLoss	39886000	USD
	us-gaap	Net Income Loss NetIncomeLoss	36968000	USD
CY2020Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16448490	shares
CY2019Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16401028	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16431724	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16393022	shares
CY2020Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	16503603	shares
CY2019Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	16445743	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	16487807	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	16439333	shares
CY2020Q2	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.65
CY2019Q2	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.55
	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	2.42
	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	2.31
CY2020Q2	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Basic Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare	0.02
CY2019Q2	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	-0.05
CY2020Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.67
CY2019Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.51
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.43
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.26
CY2020Q2	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.64
CY2019Q2	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.54
	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	2.41
	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	2.30
CY2020Q2	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Diluted Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare	0.02
CY2019Q2	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	-0.05
CY2020Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.66
CY2019Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.50
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.42
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.25
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	8304000	USD
	us-gaap	Net Income Loss NetIncomeLoss	39886000	USD
CY2020Q2	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	263272000	USD
CY2020Q2	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	357303000	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
CY2019Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	336876000	USD
CY2019Q2	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	-121000	USD
CY2020Q2	cpk	Construction Workin Progress ConstructionWorkinProgress	66267000	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
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	-242000	USD
	us-gaap	Net Income Loss NetIncomeLoss	36968000	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
CY2019Q2	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	-29000	USD
CY2020Q2	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	1703000	USD
CY2019Q2	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-2115000	USD
	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	1710000	USD
	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	868000	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	-37000	USD
CY2020Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	1732000	USD
CY2019Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-2008000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	1805000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	1081000	USD
CY2020Q2	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	12688000	USD
CY2019Q2	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	6296000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	41691000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	38049000	USD
CY2020Q2	us-gaap	Public Utilities Property Plant And Equipment Plant In Service PublicUtilitiesPropertyPlantAndEquipmentPlantInService	1499389000	USD
CY2019Q4	us-gaap	Public Utilities Property Plant And Equipment Plant In Service PublicUtilitiesPropertyPlantAndEquipmentPlantInService	1441473000	USD
CY2020Q2	cpk	Unregulated Energy Property Plant And Equipment UnregulatedEnergyPropertyPlantAndEquipment	277209000	USD
CY2019Q4	cpk	Unregulated Energy Property Plant And Equipment UnregulatedEnergyPropertyPlantAndEquipment	265209000	USD
CY2020Q2	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	39798000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	39850000	USD
CY2020Q2	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	1816396000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	1746532000	USD
CY2019Q4	cpk	Construction Workin Progress ConstructionWorkinProgress	54141000	USD
CY2020Q2	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1525360000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1463797000	USD
CY2020Q2	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	3590000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	6985000	USD
CY2020Q2	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	48799000	USD
CY2019Q4	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	50899000	USD
CY2020Q2	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	2104000	USD
CY2019Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	1337000	USD
CY2020Q2	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	46695000	USD
CY2019Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	49562000	USD
CY2020Q2	cpk	Accrued Revenue AccruedRevenue	12076000	USD
CY2019Q4	cpk	Accrued Revenue AccruedRevenue	20846000	USD
CY2020Q2	us-gaap	Energy Related Inventory Propane Gas EnergyRelatedInventoryPropaneGas	3951000	USD
CY2019Q4	us-gaap	Energy Related Inventory Propane Gas EnergyRelatedInventoryPropaneGas	5824000	USD
CY2020Q2	us-gaap	Other Inventory OtherInventory	5397000	USD
CY2019Q4	us-gaap	Other Inventory OtherInventory	6067000	USD
CY2020Q2	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	3625000	USD
CY2019Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	5144000	USD
CY2020Q2	us-gaap	Energy Related Inventory Natural Gas In Storage EnergyRelatedInventoryNaturalGasInStorage	1943000	USD
CY2019Q4	us-gaap	Energy Related Inventory Natural Gas In Storage EnergyRelatedInventoryNaturalGasInStorage	3541000	USD
CY2020Q2	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	9827000	USD
CY2019Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	20050000	USD
CY2020Q2	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	9167000	USD
CY2019Q4	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	13928000	USD
CY2020Q2	us-gaap	Energy Marketing Contracts Assets Current EnergyMarketingContractsAssetsCurrent	1270000	USD
CY2019Q4	us-gaap	Energy Marketing Contracts Assets Current EnergyMarketingContractsAssetsCurrent	0	USD
CY2020Q2	us-gaap	Other Assets Current OtherAssetsCurrent	1017000	USD
CY2019Q4	us-gaap	Other Assets Current OtherAssetsCurrent	2879000	USD
CY2020Q2	us-gaap	Assets Current AssetsCurrent	98558000	USD
CY2019Q4	us-gaap	Assets Current AssetsCurrent	134826000	USD
CY2020Q2	us-gaap	Goodwill Goodwill	32684000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	32668000	USD
CY2020Q2	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	7520000	USD
CY2019Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	8129000	USD
CY2020Q2	us-gaap	Investments Fair Value Disclosure InvestmentsFairValueDisclosure	9571000	USD
CY2019Q4	us-gaap	Investments Fair Value Disclosure InvestmentsFairValueDisclosure	9229000	USD
CY2020Q2	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	11546000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	11563000	USD
CY2020Q2	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	74814000	USD
CY2019Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	73407000	USD
CY2020Q2	cpk	Receivables And Other Deferred Charges ReceivablesAndOtherDeferredCharges	62122000	USD
CY2019Q4	cpk	Receivables And Other Deferred Charges ReceivablesAndOtherDeferredCharges	49579000	USD
CY2020Q2	cpk	Deferred Charges And Other Assets DeferredChargesAndOtherAssets	198257000	USD
CY2019Q4	cpk	Deferred Charges And Other Assets DeferredChargesAndOtherAssets	184575000	USD
CY2020Q2	us-gaap	Assets Assets	1822175000	USD
CY2019Q4	us-gaap	Assets Assets	1783198000	USD
CY2020Q2	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2019Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2020Q2	us-gaap	Common Stock Value CommonStockValue	8013000	USD
CY2019Q4	us-gaap	Common Stock Value CommonStockValue	7984000	USD
CY2019Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	259253000	USD
CY2020Q2	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	326454000	USD
CY2019Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	300607000	USD
CY2020Q2	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-4462000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-6267000	USD
CY2020Q2	us-gaap	Compensation And Benefits Trust CompensationAndBenefitsTrust	5659000	USD
CY2019Q4	us-gaap	Compensation And Benefits Trust CompensationAndBenefitsTrust	4543000	USD
CY2020Q2	us-gaap	Treasury Stock Value TreasuryStockValue	5659000	USD
CY2019Q4	us-gaap	Treasury Stock Value TreasuryStockValue	4543000	USD
CY2020Q2	us-gaap	Stockholders Equity StockholdersEquity	593277000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	561577000	USD
CY2020Q2	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	430106000	USD
CY2019Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	440168000	USD
CY2020Q2	us-gaap	Capitalization Longterm Debt And Equity CapitalizationLongtermDebtAndEquity	1023383000	USD
CY2019Q4	us-gaap	Capitalization Longterm Debt And Equity CapitalizationLongtermDebtAndEquity	1001745000	USD
CY2020Q2	us-gaap	Long Term Debt Current LongTermDebtCurrent	15600000	USD
CY2019Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	45600000	USD
CY2020Q2	us-gaap	Short Term Borrowings ShortTermBorrowings	286405000	USD
CY2019Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	247371000	USD
CY2020Q2	us-gaap	Accounts Payable Current AccountsPayableCurrent	46382000	USD
CY2019Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	54069000	USD
CY2020Q2	us-gaap	Contract With Customer Refund Liability Current ContractWithCustomerRefundLiabilityCurrent	30707000	USD
CY2019Q4	us-gaap	Contract With Customer Refund Liability Current ContractWithCustomerRefundLiabilityCurrent	30939000	USD
CY2020Q2	us-gaap	Interest Payable Current InterestPayableCurrent	2169000	USD
CY2019Q4	us-gaap	Interest Payable Current InterestPayableCurrent	2554000	USD
CY2020Q2	us-gaap	Dividends Payable Current DividendsPayableCurrent	7244000	USD
CY2019Q4	us-gaap	Dividends Payable Current DividendsPayableCurrent	6644000	USD
CY2020Q2	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	9260000	USD
CY2019Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	16236000	USD
CY2020Q2	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	10328000	USD
CY2019Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	5991000	USD
CY2020Q2	us-gaap	Energy Marketing Contract Liabilities Current EnergyMarketingContractLiabilitiesCurrent	802000	USD
CY2019Q4	us-gaap	Energy Marketing Contract Liabilities Current EnergyMarketingContractLiabilitiesCurrent	1844000	USD
CY2020Q2	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	20926000	USD
CY2019Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	12076000	USD
CY2020Q2	us-gaap	Liabilities Current LiabilitiesCurrent	429823000	USD
CY2019Q4	us-gaap	Liabilities Current LiabilitiesCurrent	423324000	USD
CY2020Q2	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	193595000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	180656000	USD
CY2020Q2	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	130180000	USD
CY2019Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	127744000	USD
CY2020Q2	us-gaap	Accrued Environmental Loss Contingencies Noncurrent AccruedEnvironmentalLossContingenciesNoncurrent	4520000	USD
	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	572000	USD
	us-gaap	Unrealized Gain Loss On Commodity Contracts UnrealizedGainLossOnCommodityContracts	-130000	USD
CY2019Q4	us-gaap	Accrued Environmental Loss Contingencies Noncurrent AccruedEnvironmentalLossContingenciesNoncurrent	6468000	USD
CY2020Q2	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	28185000	USD
CY2019Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	30569000	USD
CY2020Q2	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	10055000	USD
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	9896000	USD
CY2020Q2	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	2434000	USD
CY2019Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	2796000	USD
CY2020Q2	us-gaap	Deferred Credits And Other Liabilities DeferredCreditsAndOtherLiabilities	368969000	USD
CY2019Q4	us-gaap	Deferred Credits And Other Liabilities DeferredCreditsAndOtherLiabilities	358129000	USD
CY2020Q2	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2019Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2020Q2	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1822175000	USD
CY2019Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1783198000	USD
	us-gaap	Net Income Loss NetIncomeLoss	39886000	USD
	us-gaap	Net Income Loss NetIncomeLoss	36968000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	24500000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	22684000	USD
	cpk	Depreciation And Accretion Included In Other Costs DepreciationAndAccretionIncludedInOtherCosts	4807000	USD
	cpk	Depreciation And Accretion Included In Other Costs DepreciationAndAccretionIncludedInOtherCosts	4322000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	12232000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	7746000	USD
	us-gaap	Unrealized Gain Loss On Commodity Contracts UnrealizedGainLossOnCommodityContracts	1089000	USD
	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	3496000	USD
	cpk	Discontinued Operation Gain Lossfrom Disposalof Discontinued Operationbefore Income Tax Incremental DiscontinuedOperationGainLossfromDisposalofDiscontinuedOperationbeforeIncomeTaxIncremental	200000	USD
	us-gaap	Employee Benefits And Share Based Compensation EmployeeBenefitsAndShareBasedCompensation	21000	USD
	us-gaap	Employee Benefits And Share Based Compensation EmployeeBenefitsAndShareBasedCompensation	764000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	2322000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	1095000	USD
	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-11455000	USD
	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-51362000	USD
	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-4140000	USD
	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-6458000	USD
	us-gaap	Increase Decrease In Regulatory Assets And Liabilities IncreaseDecreaseInRegulatoryAssetsAndLiabilities	-4133000	USD
	us-gaap	Increase Decrease In Regulatory Assets And Liabilities IncreaseDecreaseInRegulatoryAssetsAndLiabilities	1610000	USD
	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-6016000	USD
	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-9660000	USD
	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-1604000	USD
	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-56902000	USD
	us-gaap	Increase Decrease In Income Taxes Receivable IncreaseDecreaseInIncomeTaxesReceivable	1480000	USD
	us-gaap	Increase Decrease In Income Taxes Receivable IncreaseDecreaseInIncomeTaxesReceivable	-4316000	USD
	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	-232000	USD
	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	-4316000	USD
	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	-7086000	USD
	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	-5365000	USD
	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	3866000	USD
	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	946000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	91678000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	74575000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	82779000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	90443000	USD
	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	4273000	USD
	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	207000	USD
	cpk	Proceedsfrom Divestitureof Businesses Incremental ProceedsfromDivestitureofBusinessesIncremental	200000	USD
	cpk	Payments For Environmental Expenditures PaymentsForEnvironmentalExpenditures	1948000	USD
	cpk	Payments For Environmental Expenditures PaymentsForEnvironmentalExpenditures	644000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-80254000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-90880000	USD
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	12976000	USD
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	11759000	USD
	us-gaap	Proceeds From Repurchase Of Equity ProceedsFromRepurchaseOfEquity	359000	USD
	us-gaap	Proceeds From Repurchase Of Equity ProceedsFromRepurchaseOfEquity	-368000	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	-3431000	USD
	us-gaap	Increase Decrease In Outstanding Checks Financing Activities IncreaseDecreaseInOutstandingChecksFinancingActivities	548000	USD
	us-gaap	Proceeds From Repayments Of Lines Of Credit ProceedsFromRepaymentsOfLinesOfCredit	42319000	USD
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	6435000	USD
	us-gaap	Proceeds From Repayments Of Lines Of Credit ProceedsFromRepaymentsOfLinesOfCredit	6220000	USD
	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	-13000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-14819000	USD
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	40100000	USD
	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	29956000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-3395000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	17470000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	1165000	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
CY2020Q2	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	3590000	USD
CY2019Q2	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	7254000	USD
CY2019Q1	us-gaap	Stockholders Equity StockholdersEquity	543659000	USD
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	8304000	USD
CY2019Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-2008000	USD
CY2019Q2	us-gaap	Dividends Dividends	6653000	USD
CY2019Q2	cpk	Stock Issued During The Period Value Retirement Savings Plan And Dividend Reinvestment Plan StockIssuedDuringThePeriodValueRetirementSavingsPlanAndDividendReinvestmentPlan	-1000	USD
CY2019Q2	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	1083000	USD
CY2019Q2	us-gaap	Stockholders Equity StockholdersEquity	544384000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	518439000	USD
	us-gaap	Net Income Loss NetIncomeLoss	36968000	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	1081000	USD
	us-gaap	Dividends Dividends	12851000	USD
	cpk	Stock Issued During The Period Value Retirement Savings Plan And Dividend Reinvestment Plan StockIssuedDuringThePeriodValueRetirementSavingsPlanAndDividendReinvestmentPlan	-2000	USD
	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	749000	USD
	cpk	Treasury Stock Activity And Deferred Compensation Plan Activity During Period Value TreasuryStockActivityAndDeferredCompensationPlanActivityDuringPeriodValue	0	USD
CY2019Q2	us-gaap	Stockholders Equity StockholdersEquity	544384000	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	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
CY2020Q2	cpk	Treasury Stock Activity And Deferred Compensation Plan Activity During Period Value TreasuryStockActivityAndDeferredCompensationPlanActivityDuringPeriodValue	0	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
CY2020Q2	us-gaap	Stockholders Equity StockholdersEquity	593277000	USD
CY2020Q2	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	2000000	shares
CY2020Q2	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
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
CY2019Q2	cpk	Shares Held In Trust For Deferred Compensation Plan SharesHeldInTrustForDeferredCompensationPlan	105409	shares
	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	2.31
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16393022	shares
CY2020Q2	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Basic Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare	0.02
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
CY2020Q2	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	794000	USD
	us-gaap	Allowance For Doubtful Accounts Receivable Recoveries AllowanceForDoubtfulAccountsReceivableRecoveries	450000	USD
	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	477000	USD
CY2020Q2	cpk	Accounts Receivable Allowancefor Credit Losses Current Disclosure AccountsReceivableAllowanceforCreditLossesCurrentDisclosure	2104000	USD
CY2020Q2	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	295000	USD
CY2019Q2	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	-610000	USD
	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	184000	USD
	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	-757000	USD
CY2020Q2	us-gaap	Net Income Loss NetIncomeLoss	10956000	USD
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	8304000	USD
	us-gaap	Net Income Loss NetIncomeLoss	39886000	USD
	us-gaap	Net Income Loss NetIncomeLoss	36968000	USD
CY2020Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16448490	shares
CY2019Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16401028	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16431724	shares
CY2020Q2	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.65
CY2019Q2	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.55
	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	2.42
CY2019Q2	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	-0.05
CY2020Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.67
CY2019Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.51
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.43
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.26
CY2020Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16448490	shares
CY2019Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16401028	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16431724	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16393022	shares
CY2020Q2	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	55113	shares
CY2019Q2	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	44715	shares
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	56083	shares
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	46311	shares
CY2020Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	16503603	shares
CY2019Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	16445743	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	16487807	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	16439333	shares
CY2020Q2	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.64
CY2019Q2	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.54
	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	2.41
	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	2.30
CY2020Q2	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Diluted Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare	0.02
CY2019Q2	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	-0.05
CY2020Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.66
CY2019Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.50
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.42
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.25
	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	5500000	USD
CY2020Q1	us-gaap	Discontinued Operation Gain Loss From Disposal Of Discontinued Operation Before Income Tax DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax	7300000	USD
CY2020Q2	us-gaap	Disposal Group Including Discontinued Operation Revenue DisposalGroupIncludingDiscontinuedOperationRevenue	3000	USD
CY2019Q2	us-gaap	Disposal Group Including Discontinued Operation Revenue DisposalGroupIncludingDiscontinuedOperationRevenue	41280000	USD
	us-gaap	Disposal Group Including Discontinued Operation Revenue DisposalGroupIncludingDiscontinuedOperationRevenue	23000	USD
	us-gaap	Disposal Group Including Discontinued Operation Revenue DisposalGroupIncludingDiscontinuedOperationRevenue	118302000	USD
	us-gaap	Disposal Group Including Discontinued Operation Interest Expense DisposalGroupIncludingDiscontinuedOperationInterestExpense	29000	USD
CY2020Q2	us-gaap	Disposal Group Including Discontinued Operation Costs Of Goods Sold DisposalGroupIncludingDiscontinuedOperationCostsOfGoodsSold	10000	USD
CY2019Q2	us-gaap	Disposal Group Including Discontinued Operation Costs Of Goods Sold DisposalGroupIncludingDiscontinuedOperationCostsOfGoodsSold	40539000	USD
	us-gaap	Disposal Group Including Discontinued Operation Costs Of Goods Sold DisposalGroupIncludingDiscontinuedOperationCostsOfGoodsSold	1000	USD
	us-gaap	Disposal Group Including Discontinued Operation Costs Of Goods Sold DisposalGroupIncludingDiscontinuedOperationCostsOfGoodsSold	115701000	USD
CY2020Q2	us-gaap	Disposal Group Including Discontinued Operation Operating Expense DisposalGroupIncludingDiscontinuedOperationOperatingExpense	39000	USD
CY2019Q2	us-gaap	Disposal Group Including Discontinued Operation Operating Expense DisposalGroupIncludingDiscontinuedOperationOperatingExpense	1470000	USD
	us-gaap	Disposal Group Including Discontinued Operation Operating Expense DisposalGroupIncludingDiscontinuedOperationOperatingExpense	197000	USD
	us-gaap	Disposal Group Including Discontinued Operation Operating Expense DisposalGroupIncludingDiscontinuedOperationOperatingExpense	3460000	USD
CY2020Q2	us-gaap	Disposal Group Including Discontinued Operation Operating Income Loss DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss	-46000	USD
CY2019Q2	us-gaap	Disposal Group Including Discontinued Operation Operating Income Loss DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss	-729000	USD
	us-gaap	Disposal Group Including Discontinued Operation Operating Income Loss DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss	-175000	USD
	us-gaap	Disposal Group Including Discontinued Operation Operating Income Loss DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss	-859000	USD
CY2020Q2	us-gaap	Disposal Group Including Discontinued Operation Interest Expense DisposalGroupIncludingDiscontinuedOperationInterestExpense	6000	USD
CY2019Q2	us-gaap	Disposal Group Including Discontinued Operation Interest Expense DisposalGroupIncludingDiscontinuedOperationInterestExpense	101000	USD
	us-gaap	Disposal Group Including Discontinued Operation Interest Expense DisposalGroupIncludingDiscontinuedOperationInterestExpense	166000	USD
CY2020Q2	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Before Income Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax	-52000	USD
CY2019Q2	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Before Income Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax	-830000	USD
	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Before Income Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax	-204000	USD
	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Before Income Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax	-1025000	USD
CY2020Q2	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	200000	USD
CY2020Q2	us-gaap	Discontinued Operation Tax Effect Of Income Loss From Disposal Of Discontinued Operation DiscontinuedOperationTaxEffectOfIncomeLossFromDisposalOfDiscontinuedOperation	147000	USD
CY2019Q2	us-gaap	Discontinued Operation Tax Effect Of Income Loss From Disposal Of Discontinued Operation DiscontinuedOperationTaxEffectOfIncomeLossFromDisposalOfDiscontinuedOperation	220000	USD
	us-gaap	Discontinued Operation Tax Effect Of Income Loss From Disposal Of Discontinued Operation DiscontinuedOperationTaxEffectOfIncomeLossFromDisposalOfDiscontinuedOperation	188000	USD
	us-gaap	Discontinued Operation Tax Effect Of Income Loss From Disposal Of Discontinued Operation DiscontinuedOperationTaxEffectOfIncomeLossFromDisposalOfDiscontinuedOperation	268000	USD
CY2019Q2	us-gaap	Disposal Group Including Discontinued Operation Depreciation And Amortization DisposalGroupIncludingDiscontinuedOperationDepreciationAndAmortization	146000	USD
	us-gaap	Disposal Group Including Discontinued Operation Depreciation And Amortization DisposalGroupIncludingDiscontinuedOperationDepreciationAndAmortization	291000	USD
CY2020Q2	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	97051000	USD
CY2019Q2	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	94542000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	249741000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	255005000	USD
	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	1000000	USD
	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-81000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	1081000	USD
	cpk	Companys Exposure In Number Of Former Manufactured Gas Plant Sites CompanysExposureInNumberOfFormerManufacturedGasPlantSites	7	site
CY2019Q2	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-5747000	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
CY2020Q2	us-gaap	Receivables From Customers ReceivablesFromCustomers	35764000	USD
CY2020Q2	us-gaap	Contract With Customer Asset Net Current ContractWithCustomerAssetNetCurrent	18000	USD
CY2020Q2	us-gaap	Contract With Customer Asset Net Noncurrent ContractWithCustomerAssetNetNoncurrent	4338000	USD
CY2020Q2	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	347000	USD
	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	-11666000	USD
	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	0	USD
	us-gaap	Increase Decrease In Other Noncurrent Assets IncreaseDecreaseInOtherNoncurrentAssets	873000	USD
	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	-242000	USD
CY2020Q2	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	200000	USD
	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	600000	USD
	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	500000	USD
	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	2
CY2020Q2	cpk	Debt Service Coverage Ratio DebtServiceCoverageRatio	1.25
CY2020Q2	cpk	Debt Service Coverage Ratio Measurement Period DebtServiceCoverageRatioMeasurementPeriod	12
	cpk	Ratiobasedonaveragenumberofpriorquarters Ratiobasedonaveragenumberofpriorquarters	6
CY2020Q2	cpk	Minimum Interest Coverage Ratio Under Agreement Two MinimumInterestCoverageRatioUnderAgreementTwo	2
CY2020Q2	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
CY2020Q2	us-gaap	Guarantee Obligations Maximum Exposure GuaranteeObligationsMaximumExposure	37000000.0	USD
CY2020Q2	us-gaap	Guarantee Obligations Current Carrying Value GuaranteeObligationsCurrentCarryingValue	11200000	USD
	cpk	Standby Letters Of Credit StandbyLettersOfCredit	4400000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	1805000	USD
CY2020Q2	us-gaap	Net Income Loss NetIncomeLoss	10956000	USD
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	8304000	USD
	us-gaap	Net Income Loss NetIncomeLoss	39886000	USD
	us-gaap	Net Income Loss NetIncomeLoss	36968000	USD
CY2020Q2	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-4462000	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-6713000	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
CY2020Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	17977000	USD
CY2019Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	18165000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	60111000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	62287000	USD
CY2020Q2	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-279000	USD
CY2019Q2	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-320000	USD
	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	3039000	USD
	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-380000	USD
CY2020Q2	us-gaap	Interest Expense InterestExpense	5054000	USD
CY2019Q2	us-gaap	Interest Expense InterestExpense	5552000	USD
	us-gaap	Interest Expense InterestExpense	10868000	USD
	us-gaap	Interest Expense InterestExpense	11180000	USD
CY2020Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	12644000	USD
CY2019Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	12293000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	52282000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	50727000	USD
CY2020Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1983000	USD
CY2019Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3379000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	12580000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	13002000	USD
CY2020Q2	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	295000	USD
CY2019Q2	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	-610000	USD
	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	184000	USD
	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	-757000	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 Amounts Recognized Gain Loss DefinedBenefitPlanAmountsRecognizedGainLoss	198000	USD
CY2019Q2	us-gaap	Defined Benefit Plan Amortization Of Prior Service Cost Credit DefinedBenefitPlanAmortizationOfPriorServiceCostCredit	-19000	USD
CY2019Q2	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	-268000	USD
CY2019Q2	cpk	Defined Benefit Plan Amounts Recognized Gain Loss DefinedBenefitPlanAmountsRecognizedGainLoss	249000	USD
CY2019Q2	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	144000	USD
CY2019Q2	cpk	Defined Benefit Plan Amounts Recognized From Regulatory Asset DefinedBenefitPlanAmountsRecognizedFromRegulatoryAsset	105000	USD
CY2019Q2	cpk	Defined Benefit Plan Amounts Recognized Gain Loss DefinedBenefitPlanAmountsRecognizedGainLoss	249000	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 Amounts Recognized From Regulatory Asset DefinedBenefitPlanAmountsRecognizedFromRegulatoryAsset	218000	USD
	cpk	Defined Benefit Plan Amounts Recognized Gain Loss DefinedBenefitPlanAmountsRecognizedGainLoss	396000	USD
	us-gaap	Defined Benefit Plan Amortization Of Prior Service Cost Credit DefinedBenefitPlanAmortizationOfPriorServiceCostCredit	-39000	USD
	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	-537000	USD
	cpk	Defined Benefit Plan Amounts Recognized Gain Loss DefinedBenefitPlanAmountsRecognizedGainLoss	498000	USD
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	289000	USD
	cpk	Defined Benefit Plan Amounts Recognized From Regulatory Asset DefinedBenefitPlanAmountsRecognizedFromRegulatoryAsset	209000	USD
	cpk	Defined Benefit Plan Amounts Recognized Gain Loss DefinedBenefitPlanAmountsRecognizedGainLoss	498000	USD
CY2020Q2	us-gaap	Investments Fair Value Disclosure InvestmentsFairValueDisclosure	9571000	USD
CY2019Q4	us-gaap	Investments Fair Value Disclosure InvestmentsFairValueDisclosure	9229000	USD
CY2020Q2	us-gaap	Trading Securities Unrealized Holding Gain Loss TradingSecuritiesUnrealizedHoldingGainLoss	1400000	USD
CY2019Q2	us-gaap	Trading Securities Unrealized Holding Gain Loss TradingSecuritiesUnrealizedHoldingGainLoss	400000	USD
	us-gaap	Trading Securities Unrealized Holding Gain Loss TradingSecuritiesUnrealizedHoldingGainLoss	-100000	USD
	us-gaap	Trading Securities Unrealized Holding Gain Loss TradingSecuritiesUnrealizedHoldingGainLoss	1100000	USD
CY2020Q2	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	1266000	USD
CY2019Q2	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	609000	USD
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	2322000	USD
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	1095000	USD
CY2020Q2	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	331000	USD
CY2019Q2	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	158000	USD
	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	607000	USD
	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	285000	USD
CY2020Q2	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	935000	USD
CY2019Q2	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	451000	USD
	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	1715000	USD
	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	810000	USD
CY2020Q2	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	5800000	USD
CY2019Q4	us-gaap	Energy Marketing Contracts Assets Current EnergyMarketingContractsAssetsCurrent	0	USD
CY2020Q2	us-gaap	Energy Marketing Contract Liabilities Current EnergyMarketingContractLiabilitiesCurrent	802000	USD
CY2019Q4	us-gaap	Energy Marketing Contract Liabilities Current EnergyMarketingContractLiabilitiesCurrent	1844000	USD
CY2020Q2	cpk	Numberofshorttermlinesof Creditrateswap NumberofshorttermlinesofCreditrateswap	3
CY2020Q2	us-gaap	Energy Marketing Contracts Assets Current EnergyMarketingContractsAssetsCurrent	1270000	USD
	us-gaap	Notional Amount Of Nonderivative Instruments NotionalAmountOfNonderivativeInstruments	100000000.0	USD
CY2020Q2	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	2552000	USD
CY2019Q2	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	-2713000	USD
	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	3788000	USD
	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	2069000	USD
CY2020Q2	us-gaap	Energy Marketing Contracts Assets Current EnergyMarketingContractsAssetsCurrent	1270000	USD
CY2020Q2	us-gaap	Energy Marketing Contracts Assets Current EnergyMarketingContractsAssetsCurrent	1270000	USD
CY2020Q2	us-gaap	Energy Marketing Contract Liabilities Current EnergyMarketingContractLiabilitiesCurrent	802000	USD
CY2020Q2	us-gaap	Energy Marketing Contract Liabilities Current EnergyMarketingContractLiabilitiesCurrent	802000	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	226000	USD
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases Sales Issuances Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements	110000	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 Transfers Out Of Level3 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3	0	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 Sales FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales	12000	USD
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings1 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1	-10000	USD
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings1 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1	-7000	USD
CY2020Q2	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	2334000	USD
CY2019Q2	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	791000	USD
CY2020Q2	us-gaap	Long Term Debt LongTermDebt	446500000	USD
CY2020Q2	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	481700000	USD
CY2019Q4	us-gaap	Long Term Debt LongTermDebt	486600000	USD
CY2019Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	505000000.0	USD
CY2020Q2	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	786000	USD
CY2019Q4	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	822000	USD
CY2020Q2	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	445706000	USD
CY2019Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	485768000	USD
CY2020Q2	us-gaap	Long Term Debt Current LongTermDebtCurrent	15600000	USD
CY2019Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	45600000	USD
CY2020Q2	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	430106000	USD
CY2019Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	440168000	USD
CY2020Q2	us-gaap	Debt Instrument Unused Borrowing Capacity Amount DebtInstrumentUnusedBorrowingCapacityAmount	310000000	USD
CY2020Q2	us-gaap	Short Term Borrowings ShortTermBorrowings	286400000	USD
CY2019Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	247400000	USD
CY2020Q2	us-gaap	Short Term Debt Weighted Average Interest Rate ShortTermDebtWeightedAverageInterestRate	0.0105
CY2019Q4	us-gaap	Short Term Debt Weighted Average Interest Rate ShortTermDebtWeightedAverageInterestRate	0.0262
	us-gaap	Notional Amount Of Nonderivative Instruments NotionalAmountOfNonderivativeInstruments	100000000.0	USD
CY2020Q2	cpk	Lineof Credit Facility Maximum Borrowing Capacity Existing LineofCreditFacilityMaximumBorrowingCapacityExisting	370000000.0	USD
	cpk	Number Of Unsecured Bank Credit Facilities NumberOfUnsecuredBankCreditFacilities	4
	cpk	Number Of Financial Institutions With Bank Credit Facilities NumberOfFinancialInstitutionsWithBankCreditFacilities	4
CY2020Q2	us-gaap	Lines Of Credit Current LinesOfCreditCurrent	284913000	USD
CY2019Q4	us-gaap	Lines Of Credit Current LinesOfCreditCurrent	244190000	USD
CY2020Q2	us-gaap	Line Of Credit Facility Remaining Borrowing Capacity LineOfCreditFacilityRemainingBorrowingCapacity	180087000	USD
CY2019Q2	us-gaap	Lease Cost LeaseCost	904000	USD
CY2020Q2	us-gaap	Bank Overdrafts BankOverdrafts	1492000	USD
CY2019Q4	us-gaap	Bank Overdrafts BankOverdrafts	3181000	USD
CY2020Q2	cpk	Line Of Credit Facility Maximum Borrowing Committed Capacity LineOfCreditFacilityMaximumBorrowingCommittedCapacity	220000000.0	USD
CY2020Q2	cpk	Participating Lenders In The Revolver ParticipatingLendersInTheRevolver	5
CY2020Q2	cpk	Lineof Credit Facility Maximum Borrowing Capacity Incremental LineofCreditFacilityMaximumBorrowingCapacityIncremental	95000000.0	USD
	us-gaap	Line Of Credit Facility Commitment Fee Percentage LineOfCreditFacilityCommitmentFeePercentage	0.0035
CY2020Q2	cpk	Lineof Credit Facility Maximum Borrowing Capacity Existing LineofCreditFacilityMaximumBorrowingCapacityExisting	370000000	USD
CY2020Q2	cpk	Lineof Credit Current Existing LineofCreditCurrentExisting	284913000	USD
CY2019Q4	cpk	Lineof Credit Current Existing LineofCreditCurrentExisting	244190000	USD
CY2020Q2	cpk	Lineof Credit Facility Remaining Borrowing Capacity Existing LineofCreditFacilityRemainingBorrowingCapacityExisting	85087000	USD
CY2020Q2	cpk	Lineof Credit Facility Maximum Borrowing Capacity Incremental LineofCreditFacilityMaximumBorrowingCapacityIncremental	95000000	USD
CY2020Q2	cpk	Lineof Credit Current Incremental LineofCreditCurrentIncremental	0	USD
CY2019Q4	cpk	Lineof Credit Current Incremental LineofCreditCurrentIncremental	0	USD
CY2020Q2	cpk	Lineof Credit Facility Remaining Borrowing Capacity Incremental LineofCreditFacilityRemainingBorrowingCapacityIncremental	95000000	USD
CY2020Q2	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	465000000	USD
CY2020Q2	us-gaap	Short Term Borrowings ShortTermBorrowings	286405000	USD
CY2019Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	247371000	USD
	us-gaap	Shortterm Debt Maximum Amount Outstanding During Period ShorttermDebtMaximumAmountOutstandingDuringPeriod	350000000.0	USD
CY2020Q2	us-gaap	Ratio Of Indebtedness To Net Capital1 RatioOfIndebtednessToNetCapital1	0.65
	us-gaap	Notional Amount Of Nonderivative Instruments NotionalAmountOfNonderivativeInstruments	100000000.0	USD
CY2020Q2	cpk	Numberofshorttermlinesof Creditrateswap NumberofshorttermlinesofCreditrateswap	3
	cpk	Effectof Cpi Basis Point Change EffectofCPIBasisPointChange	100
CY2020Q2	cpk	Minimum Renewal Term Lengthin Years Lessee MinimumRenewalTermLengthinYearsLessee	1	Y
CY2020Q2	cpk	Maximum Renewal Term Lengthin Years Lessee MaximumRenewalTermLengthinYearsLessee	25	Y
CY2020Q2	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	10055000	USD
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	9896000	USD
CY2020Q2	us-gaap	Lease Cost LeaseCost	629000	USD
CY2020Q2	cpk	Total Operatingand Finance Lease Liabilities TotalOperatingandFinanceLeaseLiabilities	11702000	USD
CY2020Q2	us-gaap	Operating Lease Cost OperatingLeaseCost	629000	USD
CY2019Q2	us-gaap	Operating Lease Cost OperatingLeaseCost	654000	USD
	us-gaap	Operating Lease Cost OperatingLeaseCost	1255000	USD
	us-gaap	Operating Lease Cost OperatingLeaseCost	1288000	USD
CY2020Q2	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	0	USD
CY2019Q2	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	249000	USD
	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	0	USD
	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	650000	USD
CY2020Q2	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	0	USD
CY2019Q2	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	1000	USD
	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	0	USD
	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	5000	USD
	us-gaap	Lease Cost LeaseCost	1255000	USD
	us-gaap	Lease Cost LeaseCost	1943000	USD
CY2020Q2	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	11546000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	11563000	USD
CY2020Q2	cpk	Total Financeand Operating Lease Rightof Use Asset TotalFinanceandOperatingLeaseRightofUseAsset	11546000	USD
CY2019Q4	cpk	Total Financeand Operating Lease Rightof Use Asset TotalFinanceandOperatingLeaseRightofUseAsset	11563000	USD
CY2020Q2	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	1647000	USD
CY2019Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	1705000	USD
CY2019Q4	cpk	Total Operatingand Finance Lease Liabilities TotalOperatingandFinanceLeaseLiabilities	11601000	USD
CY2020Q2	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P8Y7M6D
CY2019Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P8Y10M17D
CY2020Q2	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.038
CY2019Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.038
	us-gaap	Operating Lease Payments OperatingLeasePayments	1034000	USD
	us-gaap	Operating Lease Payments OperatingLeasePayments	1100000	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
CY2020Q2	us-gaap	Lessee Operating Lease Liability Payments Remainder Of Fiscal Year LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear	1089000	USD
CY2020Q2	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	2031000	USD
CY2020Q2	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	1937000	USD
CY2020Q2	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	1874000	USD
CY2020Q2	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	1619000	USD
CY2020Q2	cpk	Lessee Operating Lease Liability Payments Due Year Six LesseeOperatingLeaseLiabilityPaymentsDueYearSix	1383000	USD
CY2020Q2	cpk	Lessee Operating Lease Liability Payments Due After Year Six LesseeOperatingLeaseLiabilityPaymentsDueAfterYearSix	3876000	USD
CY2020Q2	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	13809000	USD
CY2020Q2	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	2107000	USD
CY2020Q2	us-gaap	Operating Lease Liability OperatingLeaseLiability	11702000	USD
CY2020Q2	cpk	Lessee Future Operating Lease Option Payments LesseeFutureOperatingLeaseOptionPayments	4000000.0	USD

Files In Submission

Name	View Source	Status
0001628280-20-011822-index-headers.html	Edgar Link	pending
0001628280-20-011822-index.html	Edgar Link	pending
0001628280-20-011822.txt	Edgar Link	pending
0001628280-20-011822-xbrl.zip	Edgar Link	pending
cpk-20200630.xsd	Edgar Link	pending
cpk-20200630_cal.xml	Edgar Link	unprocessable
cpk-20200630_def.xml	Edgar Link	unprocessable
cpk-20200630_lab.xml	Edgar Link	unprocessable
cpk-20200630_pre.xml	Edgar Link	unprocessable
cpk0630202010-q.htm	Edgar Link	pending
cpk0630202010-q_htm.xml	Edgar Link	completed
cpk06302020ex-101.htm	Edgar Link	pending
cpk06302020ex-102.htm	Edgar Link	pending
cpk06302020ex-103.htm	Edgar Link	pending
cpk06302020ex-104.htm	Edgar Link	pending
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cpk06302020ex-322.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
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report.css	Edgar Link	pending
Show.js	Edgar Link	pending

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$CPK
CHESAPEAKE UTILITIES CORP Stock $cpk

2020 Q2 Form 10-Q Financial Statement

#000162828020011822 Filed on August 05, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CPK CHESAPEAKE UTILITIES CORP Stock $cpk

2020 Q2 Form 10-Q Financial Statement

#000162828020011822 Filed on August 05, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CPK
CHESAPEAKE UTILITIES CORP Stock $cpk