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Consolidated Statements of Shareholders’ Equity (USD $)
In Thousands
Preferred Stock
Common Stock
Additional Paid In Capital
Accumulated Deficit
Noncontrolling Interests
Total
Beginning balance at Dec. 31, 2011   $ 9,827us-gaap_MembersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 1,257,830us-gaap_MembersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
$ (645,793)us-gaap_MembersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ 2,264us-gaap_MembersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
$ 624,128us-gaap_MembersEquity
Beginning balance (in units) at Dec. 31, 2011   98,279us-gaap_CommonUnitOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Members' contributions   681sogc_CommonUnitsIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
86,827sogc_CommonUnitsIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
    87,508sogc_CommonUnitsIssuedDuringPeriodValueNewIssues
Members' contributions (in units)   6,810sogc_CommonUnitsIssuedDuringPeriodUnitsNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
In-kind contributions   1,377sogc_MembersEquityInKindContributionsValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
176,623sogc_MembersEquityInKindContributionsValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
    178,000sogc_MembersEquityInKindContributionsValue
In-kind contributions (in units)   13,774sogc_MembersEquityInKindContributionsUnits
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Distributions - noncontrolling interests         (175)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
(175)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
Distributions to member for state tax withholding     (157)sogc_MembersEquityDistributionsToMembersForStateTaxWithholding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
    (157)sogc_MembersEquityDistributionsToMembersForStateTaxWithholding
Sale of noncontrolling interests         (2,072)us-gaap_MinorityInterestDecreaseFromRedemptions
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
(2,072)us-gaap_MinorityInterestDecreaseFromRedemptions
Net los applicable to controlling interests       (686,782)us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
  (686,782)us-gaap_NetIncomeLoss
Net loss applicable to noncontrolling interests         (17)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
(17)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Ending balance at Dec. 31, 2012   11,885us-gaap_MembersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
1,521,123us-gaap_MembersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
(1,332,575)us-gaap_MembersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
  200,433us-gaap_MembersEquity
Ending balance (in units) at Dec. 31, 2012   118,863us-gaap_CommonUnitOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Distributions to member     (10,000)sogc_MembersEquityDistributionsToMembers
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
    (10,000)sogc_MembersEquityDistributionsToMembers
Net los applicable to controlling interests       10,577us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
  10,577us-gaap_NetIncomeLoss
Ending balance at Dec. 31, 2013           201,010us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Ending balance at Dec. 31, 2013   11,885us-gaap_MembersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
1,511,123us-gaap_MembersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
(1,321,998)us-gaap_MembersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
  201,010us-gaap_MembersEquity
Beginning balance (in units) at Dec. 31, 2013   118,863us-gaap_CommonUnitOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Net los applicable to controlling interests       (326,720)us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
  (326,720)us-gaap_NetIncomeLoss
Change in equity due to merger   7,924sogc_ChangeInEquityDueToMerger
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
32,489sogc_ChangeInEquityDueToMerger
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
    40,413sogc_ChangeInEquityDueToMerger
Change in equity due to merger (in units)   79,242sogc_ChangeInEquityDueToMergerShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Issuance of preferred stock 25sogc_StockIssuedDuringPeriodValueNewIssuesPreferredStock
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember
  (25)sogc_StockIssuedDuringPeriodValueNewIssuesPreferredStock
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
     
Issuance of preferred stock (in shares) 2,509sogc_StockIssuedDuringPeriodSharesNewIssuesPreferredStock
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember
         
Restricted stock grants   287us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
(287)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
     
Restricted stock grants (in shares)   2,871us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Stock based compensation     1,041us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
    1,041us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
Tax effect of transactions with entities under common control     20,464sogc_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromTransactionsWithEntitiesUnderCommonControl
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
    20,464sogc_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromTransactionsWithEntitiesUnderCommonControl
Ending balance at Dec. 31, 2014 $ 25us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember
$ 20,096us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 1,564,805us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
$ (1,648,718)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
  $ (63,792)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Ending balance (in shares) at Dec. 31, 2014 2,509us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember
200,976us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember