Agreements expiration date.

No definition available.

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- Definition

Outstanding balance under loan commitments.

+ References

No definition available.

+ Details

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- Definition

Decrease in noncontrolling interest expressed as a percentage (for example, but not limited to, redeeming or purchasing the interests of noncontrolling shareholders, issuance of shares (interests) by the non-wholly owned subsidiary to the parent entity for other than cash, and a buyback of shares (interest) by the non-wholly owned subsidiary from the noncontrolling interests).

+ References

No definition available.

+ Details

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- Definition

The percentage of the cash available for distribution on all trust units for any quarter in excess of the target distribution that is paid for the incentive distributions.

+ References

No definition available.

+ Details

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- Definition

Percentage of royalty interests that will revert back to the Company upon termination of the trust.

+ References

No definition available.

+ Details

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- Definition

Percentage of Royalty Interest to be sold at Trust terrmination with proceeds distributed to Royalty Trust unitholders

+ References

No definition available.

+ Details

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- Definition

Percentage of Subordinated units to total units.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
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- Definition

The proceeds received from the sale of royalty trust units.

+ References

No definition available.

+ Details

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Balance Type:	debit
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- Definition

Variable Interest Entity, Ownership Interests Percentage

+ References

No definition available.

+ Details

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

+ Details

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- Definition

Portion of equity (net assets) in a variable interest entity (VIE) not attributable, directly or indirectly, to the parent entity. That is, this is the portion of equity in a VIE that is attributable to the noncontrolling interest (previously referred to as minority interest).

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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- Details

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- Details

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Variable Interest Entities - Narrative (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
Variable Interest Entity
Proceeds from sale of royalty trust units	$ 0sd_ProceedsFromSaleOfRoyaltyTrustUnits	$ 22,119,000sd_ProceedsFromSaleOfRoyaltyTrustUnits
Royalty Trusts
Variable Interest Entity
Percentage of royalty interest conveyed to company at trust termination	50.00%
Percentage of royalty interest sold at trust termination	50.00%
Percentage of subordinated units to total units	25.00%
Percentage of cash available in excess of target distribution paid for incentive distribution	50.00%
Outstanding balance under loan commitment	0		0
Noncontrolling interest	1,100,000,000		1,300,000,000
Proceeds from sale of royalty trust units		$ 22,100,000
Grey Ranch Plant, L.P
Variable Interest Entity
Beneficial interest owned by Company				50.00%
Company purchase of noncontrolling interest, percentage		50.00%
Grey Ranch Plant Genpar, LLC ("Genpar")
Variable Interest Entity
Beneficial interest owned by Company				50.00%
Percentage ownership of another VIE				1.00%
Company purchase of noncontrolling interest, percentage		50.00%
Gas Gathering Agreement \| Pinon Gathering Company LLC
Variable Interest Entity
Agreement expiration date	Jun. 30, 2029