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Supplemental Information on Oil and Natural Gas Producing Activities - Results of Operations from Oil and Natural Gas Producing Activities (Unaudited) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Extractive Industries [Abstract] |  |  |  |  |  |
Revenues | $ 1,420,879 us-gaap_OilAndGasSalesRevenue |  | $ 1,820,278 us-gaap_OilAndGasSalesRevenue |  | $ 1,759,282 us-gaap_OilAndGasSalesRevenue |
Expenses |  |  |  |  |  |
Production costs | 377,819 us-gaap_ResultsOfOperationsProductionOrLiftingCosts |  | 548,719 us-gaap_ResultsOfOperationsProductionOrLiftingCosts |  | 524,364 us-gaap_ResultsOfOperationsProductionOrLiftingCosts |
Depreciation and depletion | 434,295 sd_ResultsOfOperationsDepreciationAndDepletion |  | 567,732 sd_ResultsOfOperationsDepreciationAndDepletion |  | 568,029 sd_ResultsOfOperationsDepreciationAndDepletion |
Accretion of asset retirement obligations | 9,092 us-gaap_ResultsOfOperationsAccretionOfAssetRetirementObligations |  | 36,777 us-gaap_ResultsOfOperationsAccretionOfAssetRetirementObligations |  | 28,996 us-gaap_ResultsOfOperationsAccretionOfAssetRetirementObligations |
Total expenses | 821,206 us-gaap_ResultsOfOperationsExpenseFromOilAndGasProducingActivities |  | 1,153,228 us-gaap_ResultsOfOperationsExpenseFromOilAndGasProducingActivities |  | 1,121,389 us-gaap_ResultsOfOperationsExpenseFromOilAndGasProducingActivities |
Income before income taxes | 599,673 us-gaap_ResultsOfOperationsIncomeBeforeIncomeTaxes |  | 667,050 us-gaap_ResultsOfOperationsIncomeBeforeIncomeTaxes |  | 637,893 us-gaap_ResultsOfOperationsIncomeBeforeIncomeTaxes |
Benefit of income taxes | (3,933)us-gaap_ResultsOfOperationsIncomeTaxExpense | [1] | (7,471)us-gaap_ResultsOfOperationsIncomeTaxExpense | [1] | (437,595)us-gaap_ResultsOfOperationsIncomeTaxExpense | [1]
Results of operations for oil and natural gas producing activities (excluding corporate overhead and interest costs) | $ 603,606 us-gaap_ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts |  | $ 674,521 us-gaap_ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts |  | $ 1,075,488 us-gaap_ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts |
[1] | Reflects the Company’s effective tax rate, including the partial valuation allowance releases.

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- Definition Revenue from the sale of oil and gas during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 23 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62136-109447 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62246-109447 + Details
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- Definition Accretion expense of asset retirement obligations related to oil and gas producing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Production (lifting) costs from oil and gas producing activities, including but not limited to lease operating expense, production and ad valorem taxes, and transportation expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 23 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62136-109447 + Details
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