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Long-Term Debt Credit Facility Available Borrowing Capacity (Details) (USD $) In Thousands, unless otherwise specified | Apr. 23, 2014 | Mar. 31, 2014 | Dec. 31, 2013
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Credit Facility Available Borrowing Capacity [Abstract] |  |  |  |  |  |
Revolving credit facility | $ 0 |  | $ 0 |  | $ 0 |
Letters of Credit Outstanding, Amount | 808 | [1] | 808 | [1] | 808 | [1]
Line of Credit Facility, Remaining Borrowing Capacity | $ 1,299,192 |  | $ 1,299,192 |  | $ 1,299,192 |
[1] | (1) Letters of credit reduce the available borrowing capacity under the credit facility on a dollar-for-dollar basis.

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- Details
Name: | sm_CreditFacilityAvailableBorrowingCapacityAbstract
Namespace Prefix: | sm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityAmountOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant