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Performance Units - Additional Information (Details) (Performance Units, USD $)	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Employee Compensation Plans
Performance units, vesting period (in years)	3 years
Performance units, payout performance below minimum target threshold	$ 0sd_IncentivePlanPayoutPerformanceBelowMinimumTargetThreshold
Performance units liability	$ 2,500,000sd_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsTotalShareBasedLiabilitiesAccrued	$ 1,800,000sd_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsTotalShareBasedLiabilitiesAccrued
Minimum
Employee Compensation Plans
Performance units, payout percentages of target values	50.00%sd_IncentivePlanPayoutPercentagesOfTargetValues / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Maximum
Employee Compensation Plans
Performance units, payout percentages of target values	200.00%sd_IncentivePlanPayoutPercentagesOfTargetValues / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_RangeAxis = us-gaap_MaximumMember

X

- Details

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X

- Definition

Incentive plan payout percentages of target values based on performance above a minimum threshold

+ References

No definition available.

+ Details

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X

- Definition

Incentive plan payout if actual performance is below established minimum target thresholds

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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X

- Definition

Amount of liabilities accrued for share-based compensation as of the reporting date.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

X

- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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