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Asset Retirement Obligations - Reconciliation of Beginning and Ending Aggregate Carrying Amounts of Asset Retirement Obligations (Details) (USD $)
In Thousands, unless otherwise specified

12 Months Ended

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Asset Retirement Obligation, Roll Forward Analysis

Asset retirement obligations at January 1

$ 424,117us-gaap_AssetRetirementObligation

$ 498,410us-gaap_AssetRetirementObligation

$ 128,116us-gaap_AssetRetirementObligation

Liability incurred upon acquiring and drilling wells

4,968us-gaap_AssetRetirementObligationLiabilitiesIncurred

5,078us-gaap_AssetRetirementObligationLiabilitiesIncurred

7,479us-gaap_AssetRetirementObligationLiabilitiesIncurred

Liability assumed in acquisition

0sd_AssetRetirementObligationLiabilitiesAssumedInAcquisition

0sd_AssetRetirementObligationLiabilitiesAssumedInAcquisition

371,365sd_AssetRetirementObligationLiabilitiesAssumedInAcquisition

^[1]

Revisions in estimated cash flows

(5,848)us-gaap_AssetRetirementObligationRevisionOfEstimate

(3,077)us-gaap_AssetRetirementObligationRevisionOfEstimate

34,654us-gaap_AssetRetirementObligationRevisionOfEstimate

Liability settled or disposed in current period

(377,927)us-gaap_AssetRetirementObligationLiabilitiesSettled

^[2]

(113,071)us-gaap_AssetRetirementObligationLiabilitiesSettled

(72,200)us-gaap_AssetRetirementObligationLiabilitiesSettled

Accretion

9,092us-gaap_AssetRetirementObligationAccretionExpense

36,777us-gaap_AssetRetirementObligationAccretionExpense

28,996us-gaap_AssetRetirementObligationAccretionExpense

Asset retirement obligations at December 31

54,402us-gaap_AssetRetirementObligation

424,117us-gaap_AssetRetirementObligation

498,410us-gaap_AssetRetirementObligation

Less: current portion

0us-gaap_AssetRetirementObligationCurrent

87,063us-gaap_AssetRetirementObligationCurrent

118,504us-gaap_AssetRetirementObligationCurrent

Asset retirement obligations, net of current

$ 54,402us-gaap_AssetRetirementObligationsNoncurrent

$ 337,054us-gaap_AssetRetirementObligationsNoncurrent

$ 379,906us-gaap_AssetRetirementObligationsNoncurrent

[1]	Liability assumed in acquisition represents asset retirement obligations assumed in the acquisition of oil and natural gas properties in the Gulf of Mexico during the second quarter of 2012.
[2]	Liability settled or disposed in the current period includes $366.0 million associated with the Gulf Properties sold in February 2014, as discussed in Note 3.

X

- Definition

Asset Retirement Obligation, Liabilities Assumed in Acquisition

+ References

No definition available.

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X

- Definition

The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 410

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Asset Retirement Obligation

-URI http://asc.fasb.org/extlink&oid=6505190

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- Definition

Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 410

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6392676&loc=d3e7480-110848



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 410

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)(3)

-URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849

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- Definition

Current portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 410

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849

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- Definition

Amount of asset retirement obligations incurred during the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 410

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849

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- Definition

Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 410

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849

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- Definition

Amount of the Increase or Decrease in the amount of the asset retirement obligation during the current period for changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 410

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)(4)

-URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849

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- Definition

Noncurrent portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 410

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849

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