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Summary of Significant Accounting Policies Earnings Per Share (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 0 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount |  | 0 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount |  | 2,102 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount |
Earnings Per Share Reconciliation [Abstract] |  |  |  |  |  |
Net Income (loss) | $ 666,051,000 us-gaap_ProfitLoss |  | $ 170,935,000 us-gaap_ProfitLoss |  | $ (54,249,000)us-gaap_ProfitLoss |
Weighted Average Number of Shares Outstanding, Basic | 67,230 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 66,615 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 65,138 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |
Incremental Common Shares Attributable to Share-based Payment Arrangements | 814 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements |  | 1,383 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements |  | 0 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements |
Incremental Common Shares Attributable to Conversion of Debt Securities | 0 us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities | [1] | 0 us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities | [1] | 0 us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities | [1]
Weighted Average Number of Shares Outstanding, Diluted | 68,044 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |  | 67,998 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |  | 65,138 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |
Basic net income (loss) per common share | $ 9.91 us-gaap_EarningsPerShareBasic |  | $ 2.57 us-gaap_EarningsPerShareBasic |  | $ (0.83)us-gaap_EarningsPerShareBasic |
Diluted net income (loss) per common share | $ 9.79 us-gaap_EarningsPerShareDiluted |  | $ 2.51 us-gaap_EarningsPerShareDiluted |  | $ (0.83)us-gaap_EarningsPerShareDiluted |
Convertible Debt [Member] |  |  |  |  |  |
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |
Debt Instrument, Principal Amount Denominator for Conversion into Common Stock |  |  |  |  | 1,000 sm_DebtInstrumentPrincipalAmountDenominatorForConversionIntoCommonStock / us-gaap_DebtInstrumentAxis = us-gaap_ConvertibleDebtMember |
Debt Instrument, Convertible, Conversion Price |  |  |  |  | $ 54.42 us-gaap_DebtInstrumentConvertibleConversionPrice1 / us-gaap_DebtInstrumentAxis = us-gaap_ConvertibleDebtMember |
Retained Earnings |  |  |  |  |  |
Earnings Per Share Reconciliation [Abstract] |  |  |  |  |  |
Net Income (loss) | $ 666,051,000 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | $ 170,935,000 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | $ (54,249,000)us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
[1] | (1) For the year ended December 31, 2012, the shares into which the 3.50% Senior Convertible Notes were convertible were anti-dilutive and excluded from the calculation of diluted earnings per share.

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