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CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (in thousands, except share amounts) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Assets |  |
Cash and cash equivalents | $ 22 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 120 us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts receivable | 270,841 us-gaap_AccountsReceivableNetCurrent | 322,630 us-gaap_AccountsReceivableNetCurrent
Derivative asset | 380,633 us-gaap_DerivativeAssetsCurrent | 402,668 us-gaap_DerivativeAssetsCurrent
Prepaid expenses and other | 18,147 us-gaap_PrepaidExpenseAndOtherAssetsCurrent | 19,625 us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Total current assets | 669,643 us-gaap_AssetsCurrent | 745,043 us-gaap_AssetsCurrent
Proved Oil and Gas Properties | 7,006,832 us-gaap_ProvedOilAndGasPropertySuccessfulEffortMethod | 7,348,436 us-gaap_ProvedOilAndGasPropertySuccessfulEffortMethod
Less - accumulated depletion, depreciation, and amortization | (2,865,627)us-gaap_OilAndGasPropertySuccessfulEffortMethodAccumulatedDepreciationDepletionAndAmortization | (3,233,012)us-gaap_OilAndGasPropertySuccessfulEffortMethodAccumulatedDepreciationDepletionAndAmortization
Unproved Oil and Gas Properties | 512,461 us-gaap_UnprovedOilAndGasPropertySuccessfulEffortMethod | 532,498 us-gaap_UnprovedOilAndGasPropertySuccessfulEffortMethod
Wells in progress | 459,806 sm_WellsInProgress | 503,734 sm_WellsInProgress
Oil, gas, and other property and equipment held for sale net of accumulated depletion, depreciation and amortization of $580,637 and $22,482, respectively | 184,951 us-gaap_DisposalGroupIncludingDiscontinuedOperationLongLivedAssetsCurrent | 17,891 us-gaap_DisposalGroupIncludingDiscontinuedOperationLongLivedAssetsCurrent
Other property and equipment, net of accumulated depreciation of $35,590 and $37,079, respectively | 344,670 us-gaap_PropertyPlantAndEquipmentOtherNet | 334,356 us-gaap_PropertyPlantAndEquipmentOtherNet
Total property and equipment, net | 5,643,093 us-gaap_PropertyPlantAndEquipmentNet | 5,503,903 us-gaap_PropertyPlantAndEquipmentNet
Derivative asset | 204,841 us-gaap_DerivativeAssetsNoncurrent | 189,540 us-gaap_DerivativeAssetsNoncurrent
Other noncurrent assets | 83,109 us-gaap_OtherAssetsNoncurrent | 78,214 us-gaap_OtherAssetsNoncurrent
Total other noncurrent assets | 287,950 us-gaap_AssetsNoncurrent | 267,754 us-gaap_AssetsNoncurrent
Total Assets | 6,600,686 us-gaap_Assets | 6,516,700 us-gaap_Assets
Liabilities |  |
Accounts payable and accrued expenses | 561,051 us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent | 640,684 us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent
Deferred tax liability | 135,204 us-gaap_DeferredTaxLiabilitiesCurrent | 142,976 us-gaap_DeferredTaxLiabilitiesCurrent
Other current liabilities | 0 us-gaap_OtherLiabilitiesCurrent | 1,000 us-gaap_OtherLiabilitiesCurrent
Total current liabilities | 696,255 us-gaap_LiabilitiesCurrent | 784,660 us-gaap_LiabilitiesCurrent
Revolving credit facility | 416,500 us-gaap_LineOfCredit | 166,000 us-gaap_LineOfCredit
Senior Notes (note 5) | 2,200,000 us-gaap_SeniorNotes | 2,200,000 us-gaap_SeniorNotes
Asset retirement obligation | 108,815 us-gaap_AssetRetirementObligationsNoncurrent | 120,429 us-gaap_AssetRetirementObligationsNoncurrent
Asset retirement obligation associated with oil and gas properties held for sale | 14,286 sm_AssetRetirementObligationsAssetsHeldForSaleNoncurrent | 438 sm_AssetRetirementObligationsAssetsHeldForSaleNoncurrent
Net Profits Plan liability | 22,802 us-gaap_DeferredCompensationCashbasedArrangementsLiabilityClassifiedNoncurrent | 27,136 us-gaap_DeferredCompensationCashbasedArrangementsLiabilityClassifiedNoncurrent
Deferred income taxes | 865,726 us-gaap_DeferredTaxLiabilitiesNoncurrent | 891,681 us-gaap_DeferredTaxLiabilitiesNoncurrent
Derivative liability | 398 us-gaap_DerivativeLiabilitiesNoncurrent | 70 us-gaap_DerivativeLiabilitiesNoncurrent
Other noncurrent liabilities | 39,676 us-gaap_OtherLiabilitiesNoncurrent | 39,631 us-gaap_OtherLiabilitiesNoncurrent
Total noncurrent liabilities | 3,668,203 us-gaap_LiabilitiesNoncurrent | 3,445,385 us-gaap_LiabilitiesNoncurrent
Commitments and contingencies (note 6) |  |
Stockholders' equity: |  |
Common stock, $0.01 par value - authorized: 200,000,000 shares; issued and outstanding; 67,464,185 and 67,463,060, respectively | 675 us-gaap_CommonStockValue | 675 us-gaap_CommonStockValue
Additional paid-in-capital | 289,294 us-gaap_AdditionalPaidInCapitalCommonStock | 283,295 us-gaap_AdditionalPaidInCapitalCommonStock
Retained earnings | 1,957,747 us-gaap_RetainedEarningsAccumulatedDeficit | 2,013,997 us-gaap_RetainedEarningsAccumulatedDeficit
Accumulated other comprehensive loss | (11,488)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | (11,312)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Total stockholders' equity | 2,236,228 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 2,286,655 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Total Liabilities and Stockholders' Equity | $ 6,600,686 us-gaap_LiabilitiesAndStockholdersEquity | $ 6,516,700 us-gaap_LiabilitiesAndStockholdersEquity

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