Derivative Instruments and Hedging Activities (Gain or loss on derivative contracts) (Details) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | ||
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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Derivative Instruments, Gain (Loss) [Line Items] | |||
Net gain (loss) on fair value adjustments | $ 27,650us-gaap_UnrealizedGainLossOnDerivatives | $ (2,730)us-gaap_UnrealizedGainLossOnDerivatives | $ 1,683us-gaap_UnrealizedGainLossOnDerivatives |
Total gain (loss) on derivative instruments | 31,736us-gaap_GainLossOnDerivativeInstrumentsNetPretax | (1,360)us-gaap_GainLossOnDerivativeInstrumentsNetPretax | 1,717us-gaap_GainLossOnDerivativeInstrumentsNetPretax |
Amount of gain reclassified from OCI into income | 1,420us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet | ||
Not Designated as Hedging Instrument [Member] | |||
Derivative Instruments, Gain (Loss) [Line Items] | |||
Total gain (loss) on derivative instruments |
31,736us-gaap_GainLossOnDerivativeInstrumentsNetPretax / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |
(1,360)us-gaap_GainLossOnDerivativeInstrumentsNetPretax / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |
1,717us-gaap_GainLossOnDerivativeInstrumentsNetPretax / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |
Natural Gas [Member] | Not Designated as Hedging Instrument [Member] | |||
Derivative Instruments, Gain (Loss) [Line Items] | |||
Net gain (loss) on settlements |
(84)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_EnergyAxis = us-gaap_NaturalGasReservesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |
(148)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_EnergyAxis = us-gaap_NaturalGasReservesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |
34us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_EnergyAxis = us-gaap_NaturalGasReservesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |
Net gain (loss) on fair value adjustments |
1,267us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_EnergyAxis = us-gaap_NaturalGasReservesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |
230us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_EnergyAxis = us-gaap_NaturalGasReservesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |
(241)us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_EnergyAxis = us-gaap_NaturalGasReservesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |
Total gain (loss) on derivative instruments |
1,183us-gaap_GainLossOnDerivativeInstrumentsNetPretax / us-gaap_EnergyAxis = us-gaap_NaturalGasReservesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |
82us-gaap_GainLossOnDerivativeInstrumentsNetPretax / us-gaap_EnergyAxis = us-gaap_NaturalGasReservesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |
(207)us-gaap_GainLossOnDerivativeInstrumentsNetPretax / us-gaap_EnergyAxis = us-gaap_NaturalGasReservesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |
Crude Oil [Member] | Not Designated as Hedging Instrument [Member] | |||
Derivative Instruments, Gain (Loss) [Line Items] | |||
Net gain (loss) on settlements |
4,170us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_EnergyAxis = us-gaap_CrudeOilMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |
1,518us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_EnergyAxis = us-gaap_CrudeOilMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |
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Net gain (loss) on fair value adjustments |
26,383us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_EnergyAxis = us-gaap_CrudeOilMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |
(2,960)us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_EnergyAxis = us-gaap_CrudeOilMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |
1,924us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_EnergyAxis = us-gaap_CrudeOilMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |
Total gain (loss) on derivative instruments |
$ 30,553us-gaap_GainLossOnDerivativeInstrumentsNetPretax / us-gaap_EnergyAxis = us-gaap_CrudeOilMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |
$ (1,442)us-gaap_GainLossOnDerivativeInstrumentsNetPretax / us-gaap_EnergyAxis = us-gaap_CrudeOilMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |
$ 1,924us-gaap_GainLossOnDerivativeInstrumentsNetPretax / us-gaap_EnergyAxis = us-gaap_CrudeOilMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |
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- Definition
Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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