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 (loss)	$ 43,881	$ (24,862)	$ 35,103
Adjustments to reconcile net income (loss) to cash provided by operating activities:
Depreciation, depletion and amortization	154,356	150,902	142,687
Impairment of property and equipment	12,027us-gaap_ImpairmentOfOilAndGasProperties	89,811us-gaap_ImpairmentOfOilAndGasProperties	5,944us-gaap_ImpairmentOfOilAndGasProperties
Abandonments and impairments	20,647	5,887	4,222
Gain on sales of assets and impairment of inventory, net	(9,138)	(3,024)	(463)
Deferred income tax expense (benefit)	24,460us-gaap_DeferredIncomeTaxExpenseBenefit	(14,042)us-gaap_DeferredIncomeTaxExpenseBenefit	22,008us-gaap_DeferredIncomeTaxExpenseBenefit
Non-cash employee compensation	1,397	(3,493)	(404)
(Gain) loss on derivatives	(4,789)	8,731	(14,448)
Cash settlements of derivatives	7,099cwei_DerivativesSettledInCash	690cwei_DerivativesSettledInCash	(3,410)cwei_DerivativesSettledInCash
Accretion of asset retirement obligations	3,662	4,203	3,696
Amortization of debt issue costs and original issue discount	3,030us-gaap_AmortizationOfFinancingCosts	3,266us-gaap_AmortizationOfFinancingCosts	2,554us-gaap_AmortizationOfFinancingCosts
Amortization of deferred revenue from volumetric production payment	(7,708)us-gaap_RecognitionOfDeferredRevenue	(8,746)us-gaap_RecognitionOfDeferredRevenue	(8,295)us-gaap_RecognitionOfDeferredRevenue
Changes in operating working capital:
Accounts receivable	5,255us-gaap_IncreaseDecreaseInReceivables	(7,163)us-gaap_IncreaseDecreaseInReceivables	7,299us-gaap_IncreaseDecreaseInReceivables
Accounts payable	4,561	12,740	(9,386)
Other	(619)	5,676	2,115
Net cash provided by operating activities	258,121	220,576	189,222
CASH FLOWS FROM INVESTING ACTIVITIES
Additions to property and equipment	(422,473)	(288,133)	(526,521)
Proceeds from volumetric production payment	1,067	1,332	45,479
Proceeds from sales of assets	104,529	259,799	3,778
(Increase) decrease in equipment inventory	(1,886)	(726)	1,313
Other	(234)	(1,315)	(82)
Net cash used in investing activities	(318,997)	(29,043)	(476,033)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from long-term debt	102,139	268,335	280,000
Repayments of long-term debt	(40,000)us-gaap_RepaymentsOfLongTermDebt	(444,000)us-gaap_RepaymentsOfLongTermDebt	0us-gaap_RepaymentsOfLongTermDebt
Proceeds from exercise of stock options	130	29	12
Net cash provided by (used in) financing activities	62,269	(175,636)	280,012
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	1,393	15,897	(6,799)
CASH AND CASH EQUIVALENTS
Beginning of period	26,623	10,726	17,525
End of period	28,016	26,623	10,726
SUPPLEMENTAL DISCLOSURES
Cash paid for interest, net of amounts capitalized	47,817us-gaap_InterestPaidNet	35,219us-gaap_InterestPaidNet	35,932us-gaap_InterestPaidNet
Cash paid for income taxes	$ 1,600us-gaap_IncomeTaxesPaidNet	$ 0us-gaap_IncomeTaxesPaidNet	$ 0us-gaap_IncomeTaxesPaidNet

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Amount of noncash expense included in interest expense to issue debt and obtain financing associated with the related debt instruments. Alternate captions include noncash interest expense.

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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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Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

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The adjustment to expense previously capitalized costs of drilling exploratory wells when proved reserves are not found or when the entity obtains information that raises substantial doubt about the economic or operational viability of the project.

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Gain (loss) incurred in hedging activities.

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Amount of gain (loss) from the difference between the sale price or salvage price and the book value of an asset that was sold or retired, and gain (loss) from the write down of assets from their carrying value to fair value.

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The expense recorded to reduce the value of oil and gas assets consisting of proved properties and unproved properties as the estimate of future successful production from these properties is reduced.

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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The increase (decrease) during the reporting period in the aggregate amount of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business.

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The amount of cash paid for interest during the period net of cash paid for interest that is capitalized.

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The increase (decrease) in cash associated with the entity's continuing operating, investing, and financing activities. While for technical reasons this element has no balance attribute, the default assumption is a debit balance consistent with its label.

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Amount of cash inflow (outflow) of financing activities, excluding discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Amount of cash inflow (outflow) from operating activities, excluding discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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The cash outflow for acquisition of machinery and equipment.

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The cash outflow to purchase long lived physical asset for use in the normal oil and gas operations and to purchase mineral interests in oil and gas properties not intended for resale.

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The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets.

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The amount of previously reported deferred or unearned revenue that was recognized as revenue during the period. For cash flows, this element primarily pertains to amortization of deferred credits on long-term arrangements. As a noncash item, it is deducted from net income when calculating cash provided by or used in operations using the indirect method.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 605

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 13.A.4(a).Q1)

-URI http://asc.fasb.org/extlink&oid=27012821&loc=d3e214044-122780

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

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 13

-Section A

-Subsection 1

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

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

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration