XML 72 R60.htm IDEA: XBRL DOCUMENT v2.4.1.9
Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Assets:    
Derivatives $ 592,208us-gaap_DerivativeFairValueOfDerivativeAsset $ 52,510us-gaap_DerivativeFairValueOfDerivativeAsset
Proved oil and gas properties 7,348,436us-gaap_ProvedOilAndGasPropertySuccessfulEffortMethod 5,637,462us-gaap_ProvedOilAndGasPropertySuccessfulEffortMethod
Unproved Oil and Gas Property, Successful Effort Method 532,498us-gaap_UnprovedOilAndGasPropertySuccessfulEffortMethod 271,100us-gaap_UnprovedOilAndGasPropertySuccessfulEffortMethod
Oil and gas properties held for sale 17,891us-gaap_DisposalGroupIncludingDiscontinuedOperationLongLivedAssetsCurrent 19,072us-gaap_DisposalGroupIncludingDiscontinuedOperationLongLivedAssetsCurrent
Liabilities [Abstract]    
Derivative Liability, Fair Value, Gross Liability (70)us-gaap_DerivativeFairValueOfDerivativeLiability (31,020)us-gaap_DerivativeFairValueOfDerivativeLiability
Net Profits Plan liability 27,136us-gaap_DeferredCompensationCashbasedArrangementsLiabilityClassifiedNoncurrent 56,985us-gaap_DeferredCompensationCashbasedArrangementsLiabilityClassifiedNoncurrent
Fair Value, Measurements, Recurring [Member] | Level 1    
Liabilities [Abstract]    
Net Profits Plan liability 0us-gaap_DeferredCompensationCashbasedArrangementsLiabilityClassifiedNoncurrent
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember		 [1] 0us-gaap_DeferredCompensationCashbasedArrangementsLiabilityClassifiedNoncurrent
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember		 [1]
Fair Value, Measurements, Recurring [Member] | Level 1 | Not Designated as Hedging Instrument [Member]    
Assets:    
Derivatives 0us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 [1] 0us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 [1]
Liabilities [Abstract]    
Derivative Liability, Fair Value, Gross Liability 0us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 [1] 0us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 [1]
Fair Value, Measurements, Recurring [Member] | Level 2    
Liabilities [Abstract]    
Net Profits Plan liability 0us-gaap_DeferredCompensationCashbasedArrangementsLiabilityClassifiedNoncurrent
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember		 [1] 0us-gaap_DeferredCompensationCashbasedArrangementsLiabilityClassifiedNoncurrent
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember		 [1]
Fair Value, Measurements, Recurring [Member] | Level 2 | Not Designated as Hedging Instrument [Member]    
Assets:    
Derivatives 592,208us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 [1] 52,510us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 [1]
Liabilities [Abstract]    
Derivative Liability, Fair Value, Gross Liability 70us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 [1] 31,020us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 [1]
Fair Value, Measurements, Recurring [Member] | Level 3    
Liabilities [Abstract]    
Net Profits Plan liability 27,136us-gaap_DeferredCompensationCashbasedArrangementsLiabilityClassifiedNoncurrent
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember		 [1] 56,985us-gaap_DeferredCompensationCashbasedArrangementsLiabilityClassifiedNoncurrent
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember		 [1]
Fair Value, Measurements, Recurring [Member] | Level 3 | Not Designated as Hedging Instrument [Member]    
Assets:    
Derivatives 0us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 [1] 0us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 [1]
Liabilities [Abstract]    
Derivative Liability, Fair Value, Gross Liability 0us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 [1] 0us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 [1]
Fair Value, Measurements, Nonrecurring [Member] | Level 1    
Assets:    
Proved oil and gas properties 0us-gaap_ProvedOilAndGasPropertySuccessfulEffortMethod
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 [2] 0us-gaap_ProvedOilAndGasPropertySuccessfulEffortMethod
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 [2]
Unproved Oil and Gas Property, Successful Effort Method   0us-gaap_UnprovedOilAndGasPropertySuccessfulEffortMethod
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 [2]
Oil and gas properties held for sale 0us-gaap_DisposalGroupIncludingDiscontinuedOperationLongLivedAssetsCurrent
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 [2] 0us-gaap_DisposalGroupIncludingDiscontinuedOperationLongLivedAssetsCurrent
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 [2]
Fair Value, Measurements, Nonrecurring [Member] | Level 2    
Assets:    
Proved oil and gas properties 0us-gaap_ProvedOilAndGasPropertySuccessfulEffortMethod
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 [2] 0us-gaap_ProvedOilAndGasPropertySuccessfulEffortMethod
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 [2]
Unproved Oil and Gas Property, Successful Effort Method   0us-gaap_UnprovedOilAndGasPropertySuccessfulEffortMethod
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 [2]
Oil and gas properties held for sale 0us-gaap_DisposalGroupIncludingDiscontinuedOperationLongLivedAssetsCurrent
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 [2] 0us-gaap_DisposalGroupIncludingDiscontinuedOperationLongLivedAssetsCurrent
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 [2]
Fair Value, Measurements, Nonrecurring [Member] | Level 3    
Assets:    
Proved oil and gas properties 33,423us-gaap_ProvedOilAndGasPropertySuccessfulEffortMethod
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 [2] 62,178us-gaap_ProvedOilAndGasPropertySuccessfulEffortMethod
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 [2]
Unproved Oil and Gas Property, Successful Effort Method 0us-gaap_UnprovedOilAndGasPropertySuccessfulEffortMethod
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 [2] 3,280us-gaap_UnprovedOilAndGasPropertySuccessfulEffortMethod
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 [2]
Oil and gas properties held for sale $ 17,891us-gaap_DisposalGroupIncludingDiscontinuedOperationLongLivedAssetsCurrent
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 [2] $ 650us-gaap_DisposalGroupIncludingDiscontinuedOperationLongLivedAssetsCurrent
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 [2]
[1] (1) This represents a financial asset or liability that is measured at fair value on a recurring basis.
[2] (2) This represents a non-financial asset that is measured at fair value on a nonrecurring basis.