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Fair Value Measurements - Reconciliation of Financial Liabilities Measured at Fair Value on Recurring Basis using Unobservable Inputs (Details) (Guarantees, USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Guarantees
Level 3 Fair Value Measurements - Guarantees
Beginning balance	$ 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FinancialGuaranteeMember
Issuances(1)	9,446us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FinancialGuaranteeMember	[1]
Loss on guarantees	34sd_FairValueLiabilitiesMeasuredOnRecurringBasisChangeInContingentConsiderationLiability / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FinancialGuaranteeMember
Ending balance	$ 9,480us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_FinancialGuaranteeMember
[1] Represents the fair value of the guarantees of certain plugging and abandonment obligations on behalf of Fieldwood as of February 25, 2014, the closing date for the sale of the Gulf Properties.

X

- Definition

Amount of increase (decrease) in the value of a contingent consideration liability still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3).

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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Period Type:	duration

X

- Definition

Amount of issuances of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

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X

- Definition

Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

+ Details

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