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Accounts Receivable and Accounts Payable and Accrued Expenses Accounts Receivable (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Accounts, Notes, Loans and Financing Receivable |  |
Accounts Receivable, Net, Current | $ 322,630 us-gaap_AccountsReceivableNetCurrent | $ 318,371 us-gaap_AccountsReceivableNetCurrent
Accrued oil, gas, and NGL production revenue |  |
Accounts, Notes, Loans and Financing Receivable |  |
Accounts Receivable, Net, Current | 180,250 us-gaap_AccountsReceivableNetCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_AccruedIncomeReceivableMember | 228,169 us-gaap_AccountsReceivableNetCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_AccruedIncomeReceivableMember
Amounts due From Joint Interest Owner |  |
Accounts, Notes, Loans and Financing Receivable |  |
Accounts Receivable, Net, Current | 58,347 us-gaap_AccountsReceivableNetCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = sm_DueFromJointInterestOwnerMember | 37,517 us-gaap_AccountsReceivableNetCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = sm_DueFromJointInterestOwnerMember
Derivative Settlement Receivable [Member] |  |
Accounts, Notes, Loans and Financing Receivable |  |
Accounts Receivable, Net, Current | 39,811 us-gaap_AccountsReceivableNetCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = sm_DerivativeSettlementReceivableMember | 770 us-gaap_AccountsReceivableNetCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = sm_DerivativeSettlementReceivableMember
State severance tax refunds |  |
Accounts, Notes, Loans and Financing Receivable |  |
Accounts Receivable, Net, Current | 24,394 us-gaap_AccountsReceivableNetCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = sm_TaxesReceivableMember | 29,213 us-gaap_AccountsReceivableNetCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = sm_TaxesReceivableMember
Other |  |
Accounts, Notes, Loans and Financing Receivable |  |
Accounts Receivable, Net, Current | $ 19,828 us-gaap_AccountsReceivableNetCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = sm_OtherReceivablesMember | $ 22,702 us-gaap_AccountsReceivableNetCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = sm_OtherReceivablesMember

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- Definition Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection. + 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 210.5-02.3-4) -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 3 -Subparagraph a(1) -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 + Details
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