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Related Party Transactions - Narrative (Details) (Former Chairman and CEO Severance, USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Former Chairman and CEO Severance
   
Related Party Transaction    
Severance, liability $ 2.7us-gaap_PostemploymentBenefitsLiabilityCurrentAndNoncurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= sd_FormerChairmanandCeoSeveranceMember
$ 3.1us-gaap_PostemploymentBenefitsLiabilityCurrentAndNoncurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= sd_FormerChairmanandCeoSeveranceMember