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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Statement of Cash Flows [Abstract]    
Dividends, Common Stock, Cash $ 3,400,000us-gaap_DividendsCommonStockCash $ 3,353,000us-gaap_DividendsCommonStockCash
Net income (loss) (53,058,000)us-gaap_ProfitLoss 65,607,000us-gaap_ProfitLoss
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Gain (Loss) on Disposition of Oil and Gas Property (35,802,000)us-gaap_GainLossOnSaleOfOilAndGasProperty 2,958,000us-gaap_GainLossOnSaleOfOilAndGasProperty
Depletion, depreciation, amortization, and asset retirement obligation liability accretion 217,401,000us-gaap_ResultsOfOperationsDepreciationDepletionAmortizationAndAccretion 177,215,000us-gaap_ResultsOfOperationsDepreciationDepletionAmortizationAndAccretion
Exploratory dry hole expense 16,275,000us-gaap_ExplorationAbandonmentAndImpairmentExpense 0us-gaap_ExplorationAbandonmentAndImpairmentExpense
Impairment of proved properties 55,526,000us-gaap_ImpairmentOfOilAndGasProperties 0us-gaap_ImpairmentOfOilAndGasProperties
Abandonment and impairment of unproved properties 11,627,000us-gaap_ImpairmentOfLeasehold 2,801,000us-gaap_ImpairmentOfLeasehold
Stock-based compensation expense 6,024,000us-gaap_AllocatedShareBasedCompensationExpense 6,344,000us-gaap_AllocatedShareBasedCompensationExpense
Change in Net Profits Plan liability (4,334,000)us-gaap_OtherLaborRelatedExpenses (1,776,000)us-gaap_OtherLaborRelatedExpenses
Derivative (gain) loss (154,167,000)us-gaap_GainLossOnDerivativeInstrumentsNetPretax 97,662,000us-gaap_GainLossOnDerivativeInstrumentsNetPretax
Derivative cash settlements 160,133,000sm_Derivativecashsettlements (28,940,000)sm_Derivativecashsettlements
Amortization of deferred financing costs 1,957,000us-gaap_AmortizationOfFinancingCostsAndDiscounts 1,477,000us-gaap_AmortizationOfFinancingCostsAndDiscounts
Deferred income taxes (33,727,000)us-gaap_DeferredIncomeTaxExpenseBenefit 38,374,000us-gaap_DeferredIncomeTaxExpenseBenefit
Plugging and abandonment (2,425,000)us-gaap_AssetRetirementObligationCashPaidToSettle (1,325,000)us-gaap_AssetRetirementObligationCashPaidToSettle
Other, net 1,496,000us-gaap_OtherNoncashIncomeExpense (3,103,000)us-gaap_OtherNoncashIncomeExpense
Changes in current assets and liabilities:    
Accounts receivable 69,527,000us-gaap_IncreaseDecreaseInAccountsReceivable 9,347,000us-gaap_IncreaseDecreaseInAccountsReceivable
Prepaid expenses and other 1,281,000us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets 885,000us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Accounts payable and accrued expenses (45,416,000)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities (61,882,000)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Net Cash Provided by Operating Activities 283,922,000us-gaap_NetCashProvidedByUsedInOperatingActivities 299,728,000us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows from investing activities:    
Net proceeds from sale of oil and gas properties 21,573,000us-gaap_ProceedsFromSaleOfOilAndGasPropertyAndEquipment 1,979,000us-gaap_ProceedsFromSaleOfOilAndGasPropertyAndEquipment
Capital expenditures (544,965,000)us-gaap_PaymentsToExploreAndDevelopOilAndGasProperties (351,934,000)us-gaap_PaymentsToExploreAndDevelopOilAndGasProperties
Acquisition of proved and unproved oil and gas properties (10,069,000)us-gaap_PaymentsToAcquireOilAndGasPropertyAndEquipment 195,000us-gaap_PaymentsToAcquireOilAndGasPropertyAndEquipment
Other, net (997,000)us-gaap_PaymentsForProceedsFromOtherInvestingActivities 4,227,000us-gaap_PaymentsForProceedsFromOtherInvestingActivities
Net cash used in investing activities (534,458,000)us-gaap_NetCashProvidedByUsedInInvestingActivities (345,533,000)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash flows from financing activities:    
Proceeds from credit facility 560,000,000us-gaap_ProceedsFromLinesOfCredit 0us-gaap_ProceedsFromLinesOfCredit
Repayment of credit facility (309,500,000)us-gaap_RepaymentsOfLinesOfCredit 0us-gaap_RepaymentsOfLinesOfCredit
Other, net (62,000)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities (8,000)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
Net cash provided by (used in) financing activities 250,438,000us-gaap_NetCashProvidedByUsedInFinancingActivities (8,000)us-gaap_NetCashProvidedByUsedInFinancingActivities
Net change in cash and cash equivalents (98,000)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (45,813,000)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of period 120,000us-gaap_CashAndCashEquivalentsAtCarryingValue 282,248,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at ending of period 22,000us-gaap_CashAndCashEquivalentsAtCarryingValue 236,435,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental schedule of additional cash flow information and noncash investing and financing activities:    
Cash paid for interest, net of capitalized interest 34,059,000us-gaap_InterestPaidNet 37,851,000us-gaap_InterestPaidNet
Net cash paid (refunded) for income taxes $ 94,000us-gaap_IncomeTaxesPaidNet $ (14,000)us-gaap_IncomeTaxesPaidNet