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Fair Value Measurements - Narrative (Details) (Gulf Properties)
12 Months Ended
Dec. 31, 2014
Gulf Properties
 
Fair value inputs, probability of default 3.71%us-gaap_FairValueInputsProbabilityOfDefault
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= sd_GulfPropertiesMember