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Derivative Financial Instruments Gains and Losses (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Gain and loss from derivative cash settlements and changes in fair value of derivative contracts |  |  |  |
Derivative Settlement (Gain) Loss | $ (161,229)sm_TotalDerivativeSettlementGainLoss | [1] | $ 28,940 sm_TotalDerivativeSettlementGainLoss | [1]
Derivative Instruments Not Designated as Hedging Instruments, (Gain) Loss, Net | (154,167)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet | [2] | 97,662 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet | [2]
Crude oil |  |  |  |
Gain and loss from derivative cash settlements and changes in fair value of derivative contracts |  |  |  |
Derivative Settlement (Gain) Loss | (106,214)sm_TotalDerivativeSettlementGainLoss / us-gaap_DerivativeByNatureAxis = us-gaap_CrudeOilMember |  | 6,758 sm_TotalDerivativeSettlementGainLoss / us-gaap_DerivativeByNatureAxis = us-gaap_CrudeOilMember |
Derivative Instruments Not Designated as Hedging Instruments, (Gain) Loss, Net | (73,860)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeByNatureAxis = us-gaap_CrudeOilMember |  | 31,950 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeByNatureAxis = us-gaap_CrudeOilMember |
Natural Gas |  |  |  |
Gain and loss from derivative cash settlements and changes in fair value of derivative contracts |  |  |  |
Derivative Settlement (Gain) Loss | (34,232)sm_TotalDerivativeSettlementGainLoss / us-gaap_DerivativeByNatureAxis = us-gaap_NaturalGasReservesMember |  | 13,404 sm_TotalDerivativeSettlementGainLoss / us-gaap_DerivativeByNatureAxis = us-gaap_NaturalGasReservesMember |
Derivative Instruments Not Designated as Hedging Instruments, (Gain) Loss, Net | (82,339)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeByNatureAxis = us-gaap_NaturalGasReservesMember |  | 59,461 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeByNatureAxis = us-gaap_NaturalGasReservesMember |
Natural Gas Liquids |  |  |  |
Gain and loss from derivative cash settlements and changes in fair value of derivative contracts |  |  |  |
Derivative Settlement (Gain) Loss | (20,783)sm_TotalDerivativeSettlementGainLoss / us-gaap_DerivativeByNatureAxis = us-gaap_NaturalGasLiquidsReservesMember |  | 8,778 sm_TotalDerivativeSettlementGainLoss / us-gaap_DerivativeByNatureAxis = us-gaap_NaturalGasLiquidsReservesMember |
Derivative Instruments Not Designated as Hedging Instruments, (Gain) Loss, Net | $ 2,032 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeByNatureAxis = us-gaap_NaturalGasLiquidsReservesMember |  | $ 6,251 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeByNatureAxis = us-gaap_NaturalGasLiquidsReservesMember |
[1] | (1) Total derivative settlement (gain) loss is reported net of the change in accrued settlements between periods in the derivative cash settlements line item on the condensed consolidated statements of cash flows within net cash provided by operating activities.
[2] | (2) Total derivative (gain) loss is reported in the derivative (gain) loss line item on the condensed consolidated statements of cash flows within net cash provided by operating activities.

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- Definition Total Derivative Settlement Gain (Loss) + References No definition available. + Details
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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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