XML 50 R56.htm IDEA: XBRL DOCUMENT v2.4.1.9
Derivatives (Details ) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Effect of Derivative Instruments on the Consolidated Balance Sheets    
Fair value of derivative assets, current $ 0us-gaap_DerivativeAssetsCurrent $ 2,518us-gaap_DerivativeAssetsCurrent
Fair value of commodity derivatives 0us-gaap_DerivativeAssets 2,518us-gaap_DerivativeAssets
Fair value of derivative liabilities, current 0us-gaap_DerivativeLiabilitiesCurrent 208us-gaap_DerivativeLiabilitiesCurrent
Fair value of commodity derivatives 0us-gaap_DerivativeLiabilities 208us-gaap_DerivativeLiabilities
Assets    
Fair value of derivatives — gross presentation 0us-gaap_DerivativeFairValueOfDerivativeAsset 3,909us-gaap_DerivativeFairValueOfDerivativeAsset
Effects of netting arrangements 0cwei_DerivativeFairValueOfDerivativeAssetAmountOffsetByMasterNetting (1,391)cwei_DerivativeFairValueOfDerivativeAssetAmountOffsetByMasterNetting
Asset Derivatives, Fair Value 0us-gaap_DerivativeAssets 2,518us-gaap_DerivativeAssets
Liabilities    
Fair value of derivatives — gross presentation 0us-gaap_DerivativeFairValueOfDerivativeLiability 1,599us-gaap_DerivativeFairValueOfDerivativeLiability
Effects of netting arrangements 0cwei_DerivativeFairValueOfDerivativeLiabilityAmountOffsetByMasterNetting (1,391)cwei_DerivativeFairValueOfDerivativeLiabilityAmountOffsetByMasterNetting
Liability Derivatives, Fair Value 0us-gaap_DerivativeLiabilities 208us-gaap_DerivativeLiabilities
Commodity Derivatives | Nondesignated    
Effect of Derivative Instruments on the Consolidated Balance Sheets    
Fair value of derivative assets, current 0us-gaap_DerivativeAssetsCurrent
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
2,518us-gaap_DerivativeAssetsCurrent
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Fair value of derivative assets, noncurrent 0us-gaap_DerivativeAssetsNoncurrent
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
0us-gaap_DerivativeAssetsNoncurrent
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Fair value of commodity derivatives 0us-gaap_DerivativeAssets
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
2,518us-gaap_DerivativeAssets
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Fair value of derivative liabilities, current 0us-gaap_DerivativeLiabilitiesCurrent
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
208us-gaap_DerivativeLiabilitiesCurrent
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Fair value of derivative liabilities, noncurrent 0us-gaap_DerivativeLiabilitiesNoncurrent
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
0us-gaap_DerivativeLiabilitiesNoncurrent
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Fair value of commodity derivatives 0us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
208us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Assets    
Asset Derivatives, Fair Value 0us-gaap_DerivativeAssets
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
2,518us-gaap_DerivativeAssets
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Liabilities    
Liability Derivatives, Fair Value $ 0us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
$ 208us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember