Commitments and Contingencies--Mimimum Purchase Obligations (Details) (C O 2 Purchase Contract [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2014
C O 2 Purchase Contract [Member]
Long-term Purchase Commitment [Line Items]
2015	$ 2,556
2016	2,436
2017	1,289
2018	1,169
2019	1,196
2020 and thereafter	4,785
Total estimated minimum purchase obligations under CO2 contracts	$ 13,431

Unrecorded Unconditional Purchase Obligation Amount Due After Fifth Year Estimated Based On Current Prices

No definition available.

Name:	cpr_UnrecordedUnconditionalPurchaseObligationAmountDueAfterFifthYearEstimatedBasedOnCurrentPrices
Namespace Prefix:	cpr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Unrecorded Unconditional Purchase Obligation Amount Due In Fifth Year Estimated Based On Current Prices

No definition available.

Name:	cpr_UnrecordedUnconditionalPurchaseObligationAmountDueInFifthYearEstimatedBasedOnCurrentPrices
Namespace Prefix:	cpr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Unrecorded Unconditional Purchase Obligation Amount Due In Fourth Year Estimated Based On Current Prices

No definition available.

Name:	cpr_UnrecordedUnconditionalPurchaseObligationAmountDueInFourthYearEstimatedBasedOnCurrentPrices
Namespace Prefix:	cpr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Unrecorded Unconditional Purchase Obligation Amount Due In Second Year Estimated Based On Current Prices

No definition available.

Name:	cpr_UnrecordedUnconditionalPurchaseObligationAmountDueInSecondYearEstimatedBasedOnCurrentPrices
Namespace Prefix:	cpr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Unrecorded Unconditional Purchase Obligation Amount Due In Third Year Estimated Based On Current Prices

No definition available.

Name:	cpr_UnrecordedUnconditionalPurchaseObligationAmountDueInThirdYearEstimatedBasedOnCurrentPrices
Namespace Prefix:	cpr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Unrecorded Unconditional Purchase Obligation Amount Due Within One Year Estimated Based On Current Prices

No definition available.

Name:	cpr_UnrecordedUnconditionalPurchaseObligationAmountDueWithinOneYearEstimatedBasedOnCurrentPrices
Namespace Prefix:	cpr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Unrecorded Unconditional Purchase Obligation Balance Sheet Amount Estimated Based On Current Prices

No definition available.

Name:	cpr_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmountEstimatedBasedOnCurrentPrices
Namespace Prefix:	cpr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Name:	us-gaap_LongTermPurchaseCommitmentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration