Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income (loss), including noncontrolling interests	$ (326,720)us-gaap_ProfitLoss	$ 10,577us-gaap_ProfitLoss	$ (686,799)us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depletion, depreciation and amortization	189,516	137,068	91,353
Impairments	423,092us-gaap_AssetImpairmentCharges	1,125us-gaap_AssetImpairmentCharges	664,438us-gaap_AssetImpairmentCharges
(Gain) loss on sale of assets	(1,375)		651
Accretion expense	958us-gaap_AccretionExpense	952us-gaap_AccretionExpense	862us-gaap_AccretionExpense
Deferred tax expense	34,987us-gaap_DeferredIncomeTaxExpenseBenefit
Accrued interest expense and debt discount amortization	9,257	10,328	2,372
Amortization of deferred rent	(72)sogc_AmortizationOfDeferredRent	(249)sogc_AmortizationOfDeferredRent	(532)sogc_AmortizationOfDeferredRent
Amortization of deferred financing costs	11,341us-gaap_AmortizationOfFinancingCosts	9,587us-gaap_AmortizationOfFinancingCosts	4,020us-gaap_AmortizationOfFinancingCosts
(Gain) loss on derivative instruments	(125,226)	46,545	75,735
Amortization of option premiums	(7,216)	(1,171)	(56)
Amortization of prepaid expenses	2,912sogc_AmortizationOfPrepaidExpenses	4,787sogc_AmortizationOfPrepaidExpenses	2,546sogc_AmortizationOfPrepaidExpenses
Non-cash stock based compensation	1,041us-gaap_ShareBasedCompensation
Distributions for state tax withholdings			(157)
Working capital and other changes:
(Increase) decrease in accounts receivable	26,286	(38,195)	(8,431)
Increase in other assets	(16,192)	(7,248)	(5,811)
Increase (decrease) in accounts payable, royalties payable and accrued liabilities	(13,388)	43,092	3,975
Net cash provided by operating activities	209,201	217,198	144,166
Cash flows from investing activities:
Oil and gas property additions	(548,841)	(360,080)	(170,970)
Oil and gas property acquisitions	(36,772)		(559,066)
Cash received in Forest acquisition	134,887us-gaap_CashAcquiredFromAcquisition
Cash received from insurance proceeds		604	12,680
Gas processing equipment additions	(2,988)	(4,014)	(5,409)
Other asset additions	(2,242)	(2,075)	(384)
Cash received from sale of assets	17,342	171,756	35,764
Net cash used by investing activities	(438,614)	(193,809)	(687,385)
Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract]
Borrowings under senior secured revolving credit facility	1,209,835	193,000	123,000
Proceeds from borrowing		153,500	490,000
Debt repayments for the senior secured revolving credit facility	(969,835)	(348,000)	(136,000)
Debt issuance costs	(19,156)us-gaap_PaymentsOfDebtIssuanceCosts	(6,261)us-gaap_PaymentsOfDebtIssuanceCosts	(19,227)us-gaap_PaymentsOfDebtIssuanceCosts
Contributions			87,508sogc_ProceedsFromIssuanceOfMemberUnits
Distributions		(10,000)us-gaap_PaymentsToMinorityShareholders	(175)us-gaap_PaymentsToMinorityShareholders
Net cash provided by (used in) financing activities	220,844	(17,761)	545,106
Net increase (decrease) in cash and cash equivalents	(8,569)	5,628	1,887
Cash and cash equivalents, beginning of period	11,821	6,193	4,306
Cash and cash equivalents, end of period	3,252	11,821	6,193
Supplemental Cash Flow Information
Cash paid for interest, net of interest capitalized	$ 96,701us-gaap_InterestPaidNet	$ 76,701us-gaap_InterestPaidNet	$ 42,797us-gaap_InterestPaidNet

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- Definition

The cash inflow from the amounts received by the insured under the terms of an insurance contract settlement. This element pertains only to insurance proceeds related to investments, for example fixed assets. It excludes insurance settlements classified as operating cash flows.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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- Definition

The cash inflow from amounts received from issuance of long-term debt that is wholly or partially secured by collateral. Excludes proceeds from tax exempt secured debt.

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-Publisher FASB

-Name Accounting Standards Codification

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The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.

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- Definition

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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The cash outflow for the settlement of obligation drawn from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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- Definition

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of open derivatives, commodity, or energy contracts, held at each balance sheet date, that was included in earnings for the period.

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