Consolidated statements of cash flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities
Net income	$ 209,293us-gaap_NetIncomeLoss	$ 55,687us-gaap_NetIncomeLoss	$ 64,403us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation, depletion & amortization	245,908	192,426	169,307
Loss on impairment of other assets	0us-gaap_OtherAssetImpairmentCharges	3,490us-gaap_OtherAssetImpairmentCharges	2,000us-gaap_OtherAssetImpairmentCharges
Deferred income taxes	123,891us-gaap_DeferredIncomeTaxExpenseBenefit	31,734us-gaap_DeferredIncomeTaxExpenseBenefit	37,719us-gaap_DeferredIncomeTaxExpenseBenefit
Gain on hedge reclassification adjustments	0	(37,134)	(46,746)
Non-hedge derivative losses (gains)	(231,320)	21,635	(49,685)
Loss on extinguishment of debt	0	0	21,714
Net gain on sale of assets	(2,152)us-gaap_GainLossOnDispositionOfAssets	(670)us-gaap_GainLossOnDispositionOfAssets	(149)us-gaap_GainLossOnDispositionOfAssets
Other	4,294us-gaap_OtherNoncashIncomeExpense	4,418us-gaap_OtherNoncashIncomeExpense	5,186us-gaap_OtherNoncashIncomeExpense
Change in assets and liabilities
Accounts receivable	4,692us-gaap_IncreaseDecreaseInReceivables	(21,216)us-gaap_IncreaseDecreaseInReceivables	(12,502)us-gaap_IncreaseDecreaseInReceivables
Inventories	(5,516)us-gaap_IncreaseDecreaseInInventories	(5,923)us-gaap_IncreaseDecreaseInInventories	(2,304)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other assets	(750)	(1,299)	38
Accounts payable and accrued liabilities	(24,652)	9,977	3,988
Revenue distribution payable	(671)cpr_IncreaseDecreaseInRevenuePayable	6,986cpr_IncreaseDecreaseInRevenuePayable	(2,648)cpr_IncreaseDecreaseInRevenuePayable
Stock-based compensation	894	3,942	1,679
Net cash provided by operating activities	323,911	264,053	192,000
Cash flows from investing activities
Expenditures for property, plant, and equipment	(685,459)	(491,022)	(506,787)
Acquisition of a business	0	(153,858)	0
Proceeds from asset dispositions	291,429	111,246	46,246
Settlement of non-hedge derivative instruments	2,417	19,113	37,274
Other	(20,609)	(601)	21
Net cash used in investing activities	(412,222)	(515,122)	(423,246)
Cash flows from financing activities
Proceeds from long-term debt	302,115	297,797	208,561
Repayment of long-term debt	(228,594)us-gaap_RepaymentsOfSecuredDebt	(52,100)us-gaap_RepaymentsOfSecuredDebt	(183,482)us-gaap_RepaymentsOfSecuredDebt
Proceeds from Senior Notes	0	0	556,750
Repayment of Senior Notes	0us-gaap_EarlyRepaymentOfSeniorDebt	0us-gaap_EarlyRepaymentOfSeniorDebt	(325,000)us-gaap_EarlyRepaymentOfSeniorDebt
Proceeds from sale and leaseback of assets	0	24,500	0
Principal payments under capital lease obligations	(2,313)	(352)	(10)
Payment of debt issuance costs and other financing fees	0us-gaap_PaymentsOfFinancingCosts	0us-gaap_PaymentsOfFinancingCosts	(14,516)us-gaap_PaymentsOfFinancingCosts
Payment of debt extinguishment costs	0	0	(15,827)
Net cash provided by financing activities	71,208	269,845	226,476
Net increase (decrease) in cash and cash equivalents	(17,103)	18,776	(4,770)
Cash and cash equivalents at beginning of period	48,595	29,819	34,589
Cash and cash equivalents at end of period	$ 31,492	$ 48,595	$ 29,819

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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The cash inflow from amounts received from issuance of long-term debt that is wholly or partially secured by collateral. Excludes proceeds from tax exempt secured debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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- Definition

The cash inflow from a borrowing with the highest claim on the assets of the entity in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle, if longer).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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- Definition

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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- Definition

The cash outflow for the obligation for a lease meeting the criteria for capitalization (with maturities exceeding one year or beyond the operating cycle of the entity, if longer).

+ References

+ Details

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Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow to repay long-term debt that is wholly or partially secured by collateral. Excludes repayments of tax exempt secured debt.

+ References

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- Definition

Amount of cash inflow before closing and deferred financing costs received by a seller-lessee in a sale-leaseback recognized in financing activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 40

-Section 55

-Paragraph 51

-URI http://asc.fasb.org/extlink&oid=28365400&loc=d3e51840-112757

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 40

-Section 55

-Paragraph 50

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 40

-Section 55

-Paragraph 52

-URI http://asc.fasb.org/extlink&oid=28365400&loc=d3e51843-112757

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