Derivatives Derivatives (Details - Textuals) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2014
Derivative [Line Items]
Increase (decrease) in fair value of outstanding derivative due to change in underlying asset	$ 1.6
Price of Oil
Derivative [Line Items]
Expected change in fair value of outstanding derivative, change in price of underlying asset, per unit	1

Expected Change in Fair Value of Outstanding Derivative, Change in Price of Underlying Asset, Per Unit

No definition available.

Name:	cwei_ExpectedChangeInFairValueOfOutstandingDerivativeChangeInPriceOfUnderlyingAssetPerUnit
Namespace Prefix:	cwei_
Data Type:	us-types:perUnitItemType
Balance Type:	na
Period Type:	duration