XML 84 R58.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Fair Value Measurements (Details 2) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2011 | Dec. 31, 2013 A | Dec. 31, 2012 | Dec. 31, 2011
Proved Oil and Gas Properties |  |  |  |  |  |  |
Discount rate used for fair value of oil and gas properties (as a percent) |  | 12.00% |  |  |  |  |
Net Profit Plan liability [Member] |  |  |  |  |  |  |
Liability measured at fair value using Level 3 inputs |  |  |  |  |  |  |
Discount rate to calculate liability pools currently in payout (as a percent) |  | 12.00% |  |  |  |  |
Number of periods used for price assumptions of strip prices of liabilities |  | 5 |  |  |  |  |
Period used for price assumptions of strip prices of liabilities (in years) |  | 1 |  |  |  |  |
Percentage change in commodity prices (as a percent) |  | 5.00% |  |  |  |  |
Change in liability due to change in commodity prices by 5 percent |  | $ 5,000,000 |  |  |  |  |
Percentage increase in discount rate (as a percent) |  | 1.00% |  |  |  |  |
Increase in liability due to a 1 percent decrease in discount rate |  | 2,000,000 |  |  |  |  |
Decrease in liability due to a 1 percent increase in discount rate |  | 2,000,000 |  |  |  |  |
Liability measured at fair value using Level 3 inputs |  |  |  |  |  |  |
Net Profits Plan Liability: Beginning Balance | 135,850,000 | 78,827,000 |  | 107,731,000 |  | 135,850,000 |
Net increase (decrease) in liability |  | 3,527,000 | [1] | (9,251,000) | [1] | 2,269,000 | [1]
Net settlements |  | (25,369,000) | [1],[2],[3] | (19,653,000) | [1],[2],[3] | (30,388,000) | [1],[2],[3]
Transfers in (out) of Level 3 |  | 0 |  | 0 |  | 0 |
Net Profits Plan Liability: Ending balance |  | 56,985,000 |  | 78,827,000 |  | 107,731,000 |
Amount paid for settlement of liabilities | 2,600,000 |  |  |  |  |  |
Net Profits Plan [Member] |  |  |  |  |  |  |
Liability measured at fair value using Level 3 inputs |  |  |  |  |  |  |
Amount of cash payments related to divested properties |  | 10,300,000 |  | 2,300,000 |  | 6,300,000 |
6.625% Senior Notes Due 2019 [Member] |  |  |  |  |  |  |
Liability measured at fair value using Level 3 inputs |  |  |  |  |  |  |
Long-term Debt, Fair Value |  | 374,290,000 |  | 371,875,000 |  |  |
6.50% Senior Notes Due 2021 [Member] |  |  |  |  |  |  |
Liability measured at fair value using Level 3 inputs |  |  |  |  |  |  |
Long-term Debt, Fair Value |  | 373,625,000 |  | 371,070,000 |  |  |
6.50% Senior Notes Due 2023 [Member] |  |  |  |  |  |  |
Liability measured at fair value using Level 3 inputs |  |  |  |  |  |  |
Long-term Debt, Fair Value |  | 422,000,000 |  | 424,200,000 |  |  |
5% Senior Notes Due 2024 [Member] |  |  |  |  |  |  |
Liability measured at fair value using Level 3 inputs |  |  |  |  |  |  |
Long-term Debt, Fair Value |  | $ 475,315,000 | [4] | $ 0 | [4] |  |
[1] | Net changes in the Net Profits Plan liability are shown in the Change in Net Profits Plan liability line item of the accompanying statements of operations.
[2] | During 2011, the Company elected to cash out several Net Profits Plan pools with a $2.6 million direct payment. As a result, the Company reduced its Net Profits Plan liability by that amount. There was no impact on the accompanying statements of operations for the period ended December 31, 2011, related to these settlements.
[3] | Settlements represent cash payments made or accrued under the Net Profits Plan. The amounts in the table include cash payments made or accrued under the Net Profits Plan of $10.3 million, $2.3 million, and $6.3 million relating to divestiture proceeds for the years ended December 31, 2013, 2012, and 2011, respectively.
[4] | (1) The 2024 Notes were issued on May 20, 2013.

X
- Definition Cash payments made or accrued related to profit sharing plan liabilities arising from divested properties. + References No definition available. + Details
Name: | sm_CashPaymentsMadeOrAccruedUnderProfitSharingPlanRelatedToDivestedProperty
Namespace Prefix: | sm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Rate applied to the undiscounted amount of estimated cash flows from proved oil and gas properties to arrive at the present value recorded as of the balance sheet date. + References No definition available. + Details
Name: | sm_DiscountRateUsedForFairValueOfOilAndGasProperties
Namespace Prefix: | sm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the percentage used to calculate the estimated present value of expected future payment of liability related to deferred compensation plan that have reached payout. + References No definition available. + Details
Name: | sm_DiscountRateUsedToCalculateCurrentlyInPayoutLiabilities
Namespace Prefix: | sm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the number of periods used for price assumptions of strip prices of liabilities. + References No definition available. + Details
Name: | sm_NumberOfPeriodsUsedForPriceAssumptionsOfStripPricesOfLiabilities
Namespace Prefix: | sm_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition The amount of cash used to directly settle a portion of the net profit plan liability. + References No definition available. + Details
Name: | sm_PaymentToSettleNetProfitPlanLiability
Namespace Prefix: | sm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Change in commodity prices expressed in percent for sensitivity analysis. + References No definition available. + Details
Name: | sm_PercentChangeInCommodityPricesForSensitivityAnalysis
Namespace Prefix: | sm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Increase in commodity prices expressed in percent for sensitivity analysis. + References No definition available. + Details
Name: | sm_PercentIncreaseInDiscountRateForSensitivityAnalysis
Namespace Prefix: | sm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the period used for price assumptions of strip prices of liabilities. + References No definition available. + Details
Name: | sm_PeriodUsedForPriceAssumptionsOfStripPricesOfLiabilities
Namespace Prefix: | sm_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Change in the financial asset or liability resulting from sensitivity analysis due to change in commodity prices. + References No definition available. + Details
Name: | sm_SensitivityAnalysisChangeInLiabilityDueToChangeInCommodityPrices
Namespace Prefix: | sm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Change in the financial asset or liability resulting from sensitivity analysis due to decrease in the discount rate. + References No definition available. + Details
Name: | sm_SensitivityAnalysisDecreaseInLiabilityDueToChangeInDiscountRate
Namespace Prefix: | sm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Change in the financial asset or liability resulting from sensitivity analysis due to increase in the discount rate. + References No definition available. + Details
Name: | sm_SensitivityAnalysisIncreaseInLiabilityDueToChangeInDiscountRate
Namespace Prefix: | sm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of gain (loss) recognized in earnings, arising from liabilities measured at fair value on a recurring basis using unobservable inputs (level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Settlements that have taken place during the period in relation to liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition This element represents [net] transfers in to and out of liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period. + References No definition available. + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityTransfersNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition This element represents a liability measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
Name: | us-gaap_LongTermDebtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant