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Derivative Instruments Accounts Receivable and Payable on a Gross and Net Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Offsetting Liabilities [Line Items] |  |
Accounts Receivable Subject to Master Netting Arrangement | $ 3,834 | $ 2,391
Accounts Payable Subject To Master Netting Arrangement | 3,834 | 2,391
Net [Member] |  |
Offsetting Liabilities [Line Items] |  |
Accounts Receivable Subject to Master Netting Arrangement | 8,534 | 5,892
Accounts Payable Subject To Master Netting Arrangement | 20,907 | 14,252
Gross [Member] |  |
Offsetting Liabilities [Line Items] |  |
Accounts Receivable Subject to Master Netting Arrangement | 12,368 | 8,283
Accounts Payable Subject To Master Netting Arrangement | $ 24,741 | $ 16,643

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- Definition Accounts Payable Subject To Master Netting Arrangement + References No definition available. + Details
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Namespace Prefix: | cpk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Accounts Receivable Subject to Master Netting Arrangement + References No definition available. + Details
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Namespace Prefix: | cpk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_OffsettingLiabilitiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | cpk_GrossorNetAxis=cpk_NetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | cpk_GrossorNetAxis=cpk_GrossMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |