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Acquisitions and Dispositions (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Jul. 15, 2014
acre
Business Combinations [Abstract]    
Acreage Sold in Oil and Gas Properties   8,300sfy_AcreageSoldinOilandGasProperties
Participation Interest Sold in Oil and Gas Properties   36.00%sfy_ParticipationInterestSoldinOilandGasProperties
Sale proceeds from disposal of properties   $ 175us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds
Cash Received at Closing from Oil and Gas Properties   125sfy_CashReceivedatClosingfromOilandGasProperties
Cash Carry of Field Development Costs   50sfy_CashCarryofFieldDevelopmentCosts
Remaining Cash Carry of Field Development Costs 29sfy_RemainingCashCarryofFieldDevelopmentCosts  
Sale Proceeds Received at Closing   147sfy_SaleProceedsReceivedatClosing
Deferred Credits and Other Liabilities, Current   $ 12.5us-gaap_DeferredCreditsAndOtherLiabilitiesCurrent