$SM
SM Energy Co Stock $sm

$sm Overview Financials Valuation SEC Filings Company Website

2013 Q4 Form 10-K Financial Statement

#000089353814000010 Filed on February 19, 2014

Income Statement

Concept	2013 Q4	2012 Q4	2011
Revenue	$608.2M	$440.1M	$1.603B
YoY Change	38.2%	8.8%	46.71%
Cost Of Revenue	$162.8M	$111.2M	$290.1M
YoY Change	46.4%	19.31%	48.69%
Gross Profit	$445.5M	$328.9M	$1.093B
YoY Change	35.45%	5.65%	47.14%
Gross Profit Margin	73.25%	74.73%	68.14%
Selling, General & Admin	$48.00M	$28.40M	$118.5M
YoY Change	69.01%	-20.22%	11.06%
% of Gross Profit	10.77%	8.63%	10.85%
Research & Development	$21.80M	$24.20M	$53.50M
YoY Change	-9.92%	21.0%	-16.28%
% of Gross Profit	4.89%	7.36%	4.9%
Depreciation & Amortization	$202.7M	$204.3M	$511.1M
YoY Change	-0.78%	22.12%	52.07%
% of Gross Profit	45.5%	62.12%	46.78%
Operating Expenses	$273.5M	$259.1M	$739.6M
YoY Change	5.56%	5.24%	36.46%
Operating Profit	$172.0M	$69.80M	$384.4M
YoY Change	146.42%	7.22%	13.46%
Interest Expense	-$36.10M	-$2.800M	$45.85M
YoY Change	1189.29%	-95.25%	89.49%
% of Operating Profit	-20.99%	-4.01%	11.93%
Other Income/Expense, Net	$0.00	$0.00	$500.0K
YoY Change		-100.0%	66.67%
Pretax Income	$15.80M	-$104.1M	$339.0M
YoY Change	-115.18%	-45.87%	7.65%
Income Tax	$8.800M	-$37.00M	$123.6M
% Of Pretax Income	55.7%		36.46%
Net Earnings	$7.000M	-$67.10M	$215.4M
YoY Change	-110.43%	-44.41%	9.44%
Net Earnings / Revenue	1.15%	-15.25%	13.44%
Basic Earnings Per Share			$3.38
Diluted Earnings Per Share	$102.8K	-$1.015M	$3.19
COMMON SHARES
Basic Shares Outstanding	66.99M shares	66.08M shares	63.76M shares
Diluted Shares Outstanding			67.56M shares

Balance Sheet

Concept	2013 Q4	2012 Q4	2011
SHORT-TERM ASSETS
Cash & Short-Term Investments	$282.2M	$5.900M	$119.2M
YoY Change	4683.05%	-95.05%	2237.25%
Cash & Equivalents	$282.2M	$5.926M	$119.2M
Short-Term Investments
Other Short-Term Assets	$42.20M	$76.50M	$128.0M
YoY Change	-44.84%	-40.23%	30.75%
Inventory
Prepaid Expenses
Receivables	$318.4M	$254.8M	$149.4M
Other Receivables	$28.10M	$17.70M	$66.50M
Total Short-Term Assets	$647.5M	$340.6M	$463.2M
YoY Change	90.13%	-26.48%	68.68%
LONG-TERM ASSETS
Property, Plant & Equipment	$3.860B	$3.677B	$3.097B
YoY Change	4.97%	18.75%	27.22%
Goodwill
YoY Change
Intangibles	$10.80M	$10.80M
YoY Change	0.0%	52.11%
Long-Term Investments
YoY Change
Other Assets	$70.21M	$78.53M	$239.1M
YoY Change	-10.6%	-5.81%	571.63%
Total Long-Term Assets	$197.9M	$181.8M	$3.336B
YoY Change	8.86%	-23.99%	35.07%
TOTAL ASSETS
Total Short-Term Assets	$647.5M	$340.6M	$463.2M
Total Long-Term Assets	$197.9M	$181.8M	$3.336B
Total Assets	$4.705B	$4.200B	$3.799B
YoY Change	12.04%	10.54%	38.43%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$606.8M	$525.6M
YoY Change	15.45%	15.01%
Accrued Expenses			$420.4M
YoY Change			10.57%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$639.1M	$541.5M	$505.8M
YoY Change	18.02%	7.07%	0.74%
LONG-TERM LIABILITIES
Long-Term Debt	$1.600B	$1.440B	$985.1M
YoY Change	11.11%	46.18%	204.32%
Other Long-Term Liabilities	$28.77M	$66.36M	$276.9M
YoY Change	-56.64%	-2.2%	7.79%
Total Long-Term Liabilities	$2.459B	$2.244B	$1.262B
YoY Change	9.61%	22.58%	117.36%
TOTAL LIABILITIES
Total Short-Term Liabilities	$639.1M	$541.5M	$505.8M
Total Long-Term Liabilities	$2.459B	$2.244B	$1.262B
Total Liabilities	$3.098B	$2.785B	$2.336B
YoY Change	11.25%	19.22%	53.1%
SHAREHOLDERS EQUITY
Retained Earnings	$1.355B	$1.190B
YoY Change	13.8%	-4.86%
Common Stock	$258.4M	$234.3M
YoY Change	10.28%	7.67%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$823.0K	$1.221M
YoY Change	-32.6%	-20.92%
Treasury Stock Shares	22.41K shares	50.58K shares
Shareholders Equity	$1.607B	$1.415B	$1.463B
YoY Change
Total Liabilities & Shareholders Equity	$4.705B	$4.200B	$3.799B
YoY Change	12.04%	10.54%	38.43%

Cashflow Statement

Concept	2013 Q4	2012 Q4	2011
OPERATING ACTIVITIES
Net Income	$7.000M	-$67.10M	$215.4M
YoY Change	-110.43%	-44.41%	9.44%
Depreciation, Depletion And Amortization	$202.7M	$204.3M	$511.1M
YoY Change	-0.78%	22.12%	52.07%
Cash From Operating Activities	$337.6M	$268.4M	$760.5M
YoY Change	25.78%	-0.89%	52.99%
INVESTING ACTIVITIES
Capital Expenditures	-$432.1M	-$381.0M	-$1.633B
YoY Change	13.41%	-30.92%	144.37%
Acquisitions
YoY Change
Other Investing Activities	$405.6M	$7.400M	-$3.661M
YoY Change	5381.08%	-82.99%	-188.75%
Cash From Investing Activities	-$26.50M	-$373.6M	-$1.265B
YoY Change	-92.91%	-26.46%	249.84%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net			$7.327M
YoY Change			13.77%
Debt Paid & Issued, Net			$0.00
YoY Change
Cash From Financing Activities	-29.10M	111.0M	$618.5M
YoY Change	-126.22%	-66.0%	-538.35%
NET CHANGE
Cash From Operating Activities	337.6M	268.4M	$760.5M
Cash From Investing Activities	-26.50M	-373.6M	-$1.265B
Cash From Financing Activities	-29.10M	111.0M	$618.5M
Net Change In Cash	282.0M	5.800M	$114.1M
YoY Change	4762.07%	-93.51%	-2148.04%
FREE CASH FLOW
Cash From Operating Activities	$337.6M	$268.4M	$760.5M
Capital Expenditures	-$432.1M	-$381.0M	-$1.633B
Free Cash Flow	$769.7M	$649.4M	$2.394B
YoY Change	18.52%	-21.03%	105.39%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
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CY2013Q4	us-gaap	Accounts Payable And Accrued Liabilities Current AccountsPayableAndAccruedLiabilitiesCurrent	606751000	USD
CY2012Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	254805000	USD
CY2013Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	318371000	USD
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-9014000	USD
CY2013Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-5416000	USD
CY2012Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	233642000	USD
CY2013Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	257720000	USD
CY2013	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	32347000	USD
CY2011	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	26824000	USD
CY2012	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	30185000	USD
CY2012	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	6769000	USD
CY2013	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	5390000	USD
CY2011	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	18299000	USD
CY2011	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
CY2012	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	2102000	shares
CY2013	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
CY2012Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	120518000	USD
CY2011Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	95906000	USD
CY2013Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	121186000	USD
CY2012	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	4679000	USD
CY2013	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	5997000	USD
CY2013	us-gaap	Asset Retirement Obligation Cash Paid To Settle AssetRetirementObligationCashPaidToSettle	9946000	USD
CY2012	us-gaap	Asset Retirement Obligation Cash Paid To Settle AssetRetirementObligationCashPaidToSettle	2856000	USD
CY2011	us-gaap	Asset Retirement Obligation Cash Paid To Settle AssetRetirementObligationCashPaidToSettle	5849000	USD
CY2012Q4	us-gaap	Asset Retirement Obligation Current AssetRetirementObligationCurrent	6200000	USD
CY2013Q4	us-gaap	Asset Retirement Obligation Current AssetRetirementObligationCurrent	2500000	USD
CY2012	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	13050000	USD
CY2013	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	18682000	USD
CY2012	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	-8101000	USD
CY2013	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	-33129000	USD
CY2012	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	14984000	USD
CY2013	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	9118000	USD
CY2012Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	112912000	USD
CY2013Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	115659000	USD
CY2013Q4	us-gaap	Assets Assets	4705165000	USD
CY2012Q4	us-gaap	Assets Assets	4199529000	USD
CY2012Q4	us-gaap	Assets Current AssetsCurrent	340564000	USD
CY2013Q4	us-gaap	Assets Current AssetsCurrent	647501000	USD
CY2012Q4	us-gaap	Assets Held For Sale Long Lived AssetsHeldForSaleLongLived	33620000	USD
CY2013Q4	us-gaap	Assets Held For Sale Long Lived AssetsHeldForSaleLongLived	19072000	USD
CY2012Q4	us-gaap	Assets Noncurrent AssetsNoncurrent	181768000	USD
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CY2013	us-gaap	Capitalized Exploratory Well Cost Additions Pending Determination Of Proved Reserves CapitalizedExploratoryWellCostAdditionsPendingDeterminationOfProvedReserves	34527000	USD
CY2011	us-gaap	Capitalized Exploratory Well Cost Additions Pending Determination Of Proved Reserves CapitalizedExploratoryWellCostAdditionsPendingDeterminationOfProvedReserves	15618000	USD
CY2012	us-gaap	Capitalized Exploratory Well Cost Additions Pending Determination Of Proved Reserves CapitalizedExploratoryWellCostAdditionsPendingDeterminationOfProvedReserves	9100000	USD
CY2012	us-gaap	Capitalized Exploratory Well Cost Charged To Expense CapitalizedExploratoryWellCostChargedToExpense	-12735000	USD
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CY2012Q3	us-gaap	Capitalized Exploratory Well Cost Charged To Expense CapitalizedExploratoryWellCostChargedToExpense	3600000	USD
CY2012Q4	us-gaap	Capitalized Exploratory Well Costs CapitalizedExploratoryWellCosts	9100000	USD
CY2011Q4	us-gaap	Capitalized Exploratory Well Costs CapitalizedExploratoryWellCosts	18600000	USD
CY2013Q4	us-gaap	Capitalized Exploratory Well Costs CapitalizedExploratoryWellCosts	34527000	USD
CY2010Q4	us-gaap	Capitalized Exploratory Well Costs CapitalizedExploratoryWellCosts	35862000	USD
CY2012Q4	us-gaap	Capitalized Exploratory Well Costs That Have Been Capitalized For Period Greater Than One Year CapitalizedExploratoryWellCostsThatHaveBeenCapitalizedForPeriodGreaterThanOneYear	0	USD
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CY2013Q4	us-gaap	Capitalized Exploratory Well Costs That Have Been Capitalized For Period Greater Than One Year CapitalizedExploratoryWellCostsThatHaveBeenCapitalizedForPeriodGreaterThanOneYear	0	USD
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CY2013Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	282248000	USD
CY2012Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	5926000	USD
CY2011Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	119194000	USD
CY2010Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	5077000	USD
CY2012	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-113268000	USD
CY2011	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	114117000	USD
CY2013	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	276322000	USD
CY2012Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2013Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2010	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.10
CY2012	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.10
CY2013	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.10
CY2012Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
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CY2012Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	200000000	shares
CY2013Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	200000000	shares
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CY2012Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	66245816	shares
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CY2012Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	66195235	shares
CY2013Q4	us-gaap	Common Stock Value CommonStockValue	671000	USD
CY2012Q4	us-gaap	Common Stock Value CommonStockValue	662000	USD
CY2012	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-58983000	USD
CY2013	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	174533000	USD
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CY2011	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	11202000	USD
CY2013Q4	us-gaap	Contractual Obligation ContractualObligation	1213599000	USD
CY2013Q4	us-gaap	Contractual Obligation Due After Fifth Year ContractualObligationDueAfterFifthYear	481947000	USD
CY2013Q4	us-gaap	Contractual Obligation Due In Fifth Year ContractualObligationDueInFifthYear	128418000	USD
CY2013Q4	us-gaap	Contractual Obligation Due In Fourth Year ContractualObligationDueInFourthYear	132559000	USD
CY2013Q4	us-gaap	Contractual Obligation Due In Next Twelve Months ContractualObligationDueInNextTwelveMonths	179118000	USD
CY2013Q4	us-gaap	Contractual Obligation Due In Second Year ContractualObligationDueInSecondYear	147119000	USD
CY2013Q4	us-gaap	Contractual Obligation Due In Third Year ContractualObligationDueInThirdYear	144438000	USD
CY2013	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	0	USD
CY2011	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	1553000	USD
CY2012	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	370000	USD
CY2013	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	2121000	USD
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CY2011	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-1757000	USD
CY2012Q4	us-gaap	Deferred Compensation Cashbased Arrangements Liability Classified Noncurrent DeferredCompensationCashbasedArrangementsLiabilityClassifiedNoncurrent	78827000	USD
CY2013Q4	us-gaap	Deferred Compensation Cashbased Arrangements Liability Classified Noncurrent DeferredCompensationCashbasedArrangementsLiabilityClassifiedNoncurrent	56985000	USD
CY2011	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	123789000	USD
CY2013	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	105555000	USD
CY2012	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-29638000	USD
CY2013Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	779237000	USD
CY2012Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	701009000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	177520000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	144862000	USD
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CY2012Q4	us-gaap	Deferred Tax Assets Gross Current DeferredTaxAssetsGrossCurrent	14021000	USD
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CY2013Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	650125000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	6443000	USD
CY2013Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	1245000	USD
CY2013Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	768463000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	678624000	USD
CY2012Q4	us-gaap	Defined Benefit Plan Accumulated Benefit Obligation DefinedBenefitPlanAccumulatedBenefitObligation	29437000	USD
CY2013Q4	us-gaap	Defined Benefit Plan Accumulated Benefit Obligation DefinedBenefitPlanAccumulatedBenefitObligation	32396000	USD
CY2012Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax	12580000	USD
CY2013Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax	8575000	USD
CY2012Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Net Gains Losses Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax	12427000	USD
CY2013Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Net Gains Losses Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax	8439000	USD
CY2013Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Net Transition Assets Obligations Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetTransitionAssetsObligationsBeforeTax	0	USD
CY2012Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Net Transition Assets Obligations Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetTransitionAssetsObligationsBeforeTax	0	USD
CY2013	us-gaap	Defined Benefit Plan Actual Return On Plan Assets DefinedBenefitPlanActualReturnOnPlanAssets	2726000	USD
CY2012	us-gaap	Defined Benefit Plan Actual Return On Plan Assets DefinedBenefitPlanActualReturnOnPlanAssets	1952000	USD
CY2012	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	5467000	USD
CY2013	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	-1577000	USD
CY2013	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	-1222000	USD
CY2011	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	-405000	USD
CY2012	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	-754000	USD
CY2011	us-gaap	Defined Benefit Plan Amortization Of Prior Service Cost Credit DefinedBenefitPlanAmortizationOfPriorServiceCostCredit	0	USD
CY2013	us-gaap	Defined Benefit Plan Amortization Of Prior Service Cost Credit DefinedBenefitPlanAmortizationOfPriorServiceCostCredit	17000	USD
CY2012	us-gaap	Defined Benefit Plan Amortization Of Prior Service Cost Credit DefinedBenefitPlanAmortizationOfPriorServiceCostCredit	17000	USD
CY2012	us-gaap	Defined Benefit Plan Amounts Recognized In Other Comprehensive Income Net Prior Service Cost Credit Before Tax DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax	153000	USD
CY2013	us-gaap	Defined Benefit Plan Amounts Recognized In Other Comprehensive Income Net Prior Service Cost Credit Before Tax DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax	136000	USD
CY2013	us-gaap	Defined Benefit Plan Amounts That Will Be Amortized From Accumulated Other Comprehensive Income Loss In Next Fiscal Year DefinedBenefitPlanAmountsThatWillBeAmortizedFromAccumulatedOtherComprehensiveIncomeLossInNextFiscalYear	436000	USD
CY2012Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate	0.039
CY2011Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate	0.047
CY2013Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate	0.050
CY2013Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Rate Of Compensation Increase DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease	0.062
CY2012Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Rate Of Compensation Increase DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease	0.062
CY2011Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Rate Of Compensation Increase DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease	0.062
CY2012	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate	0.047
CY2013	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate	0.039
CY2011	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate	0.053
CY2013	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.075
CY2011	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.075
CY2012	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.075
CY2011	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Rate Of Compensation Increase DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease	0.062
CY2013	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Rate Of Compensation Increase DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease	0.062
CY2012	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Rate Of Compensation Increase DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease	0.062
CY2013Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	43285000	USD
CY2012Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	40237000	USD
CY2011Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	29480000	USD
CY2013	us-gaap	Defined Benefit Plan Benefits Paid DefinedBenefitPlanBenefitsPaid	-3293000	USD
CY2012	us-gaap	Defined Benefit Plan Benefits Paid DefinedBenefitPlanBenefitsPaid	-1018000	USD
CY2013	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	4971000	USD
CY2012	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	5380000	USD
CY2011	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	5300000	USD
CY2013Q4	us-gaap	Defined Benefit Plan Estimated Future Employer Contributions In Next Fiscal Year DefinedBenefitPlanEstimatedFutureEmployerContributionsInNextFiscalYear	4300000	USD
CY2013Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Five Fiscal Years Thereafter DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter	33031000	USD
CY2013Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Next Twelve Months DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths	2120000	USD
CY2013Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Five DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive	4407000	USD
CY2013Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Four DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour	3993000	USD
CY2013Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Three DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree	3287000	USD
CY2013Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Two DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo	2837000	USD
CY2011	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets	880000	USD
CY2013	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets	1538000	USD
CY2012	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets	1165000	USD
CY2012Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	20254000	USD
CY2013Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	24658000	USD
CY2011Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	13940000	USD
CY2012Q4	us-gaap	Defined Benefit Plan Funded Status Of Plan DefinedBenefitPlanFundedStatusOfPlan	-19983000	USD
CY2013Q4	us-gaap	Defined Benefit Plan Funded Status Of Plan DefinedBenefitPlanFundedStatusOfPlan	-18627000	USD
CY2012	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	1374000	USD
CY2013	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	1627000	USD
CY2011	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	1184000	USD
CY2011	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	4509000	USD
CY2012	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	5914000	USD
CY2013	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	7619000	USD
CY2013	us-gaap	Defined Benefit Plan Plan Amendments DefinedBenefitPlanPlanAmendments	0	USD
CY2012	us-gaap	Defined Benefit Plan Plan Amendments DefinedBenefitPlanPlanAmendments	0	USD
CY2012	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	4934000	USD
CY2013	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	6291000	USD
CY2011	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	3800000	USD
CY2013	us-gaap	Defined Benefit Plan Target Plan Asset Allocations DefinedBenefitPlanTargetPlanAssetAllocations	1.000
CY2012Q4	us-gaap	Defined Benefit Plan Weighted Average Asset Allocations DefinedBenefitPlanWeightedAverageAssetAllocations	1.000
CY2013Q4	us-gaap	Defined Benefit Plan Weighted Average Asset Allocations DefinedBenefitPlanWeightedAverageAssetAllocations	1.000
CY2012Q4	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	37873000	USD
CY2013Q4	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	21559000	USD
CY2013Q4	us-gaap	Derivative Assets Noncurrent DerivativeAssetsNoncurrent	30951000	USD
CY2012Q4	us-gaap	Derivative Assets Noncurrent DerivativeAssetsNoncurrent	16466000	USD
CY2013Q4	us-gaap	Derivative Fair Value Of Derivative Asset Amount Not Offset Against Collateral DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral	-30652000	USD
CY2012Q4	us-gaap	Derivative Fair Value Of Derivative Asset Amount Not Offset Against Collateral DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral	-13400000	USD
CY2012Q4	us-gaap	Derivative Fair Value Of Derivative Asset Amount Offset Against Collateral DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral	54339000	USD
CY2013Q4	us-gaap	Derivative Fair Value Of Derivative Asset Amount Offset Against Collateral DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral	52510000	USD
CY2013Q4	us-gaap	Derivative Fair Value Of Derivative Liability Amount Not Offset Against Collateral DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral	30652000	USD
CY2012Q4	us-gaap	Derivative Fair Value Of Derivative Liability Amount Not Offset Against Collateral DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral	13400000	USD
CY2012Q4	us-gaap	Derivative Fair Value Of Derivative Liability Amount Offset Against Collateral DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral	-15644000	USD
CY2013Q4	us-gaap	Derivative Fair Value Of Derivative Liability Amount Offset Against Collateral DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral	-31020000	USD
CY2012Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	8999000	USD
CY2013Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	26380000	USD
CY2012Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	6645000	USD
CY2013Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	4640000	USD
CY2013	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	6663000	USD
CY2012	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	6511000	USD
CY2011	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	6382000	USD
CY2013	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.57
CY2012	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.83
CY2011	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.38
CY2012	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.83
CY2011	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.19
CY2013	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.51
CY2011	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	118652000	USD
CY2013	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	97514000	USD
CY2012	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	-29231000	USD
CY2013	us-gaap	Income Tax Reconciliation Nondeductible Expense Depletion IncomeTaxReconciliationNondeductibleExpenseDepletion	-154000	USD
CY2011	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	1705000	USD
CY2012	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	611000	USD
CY2013	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	9400000	USD
CY2011	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	6458000	USD
CY2012	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	-992000	USD
CY2012Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	2384000	USD
CY2011Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	0	USD
CY2013Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	3421000	USD
CY2013	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.386
CY2012	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.350
CY2011	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.365
CY2012	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	0	USD
CY2011	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	0	USD
CY2013	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	0	USD
CY2013	us-gaap	Excess Tax Benefit From Share Based Compensation Operating Activities ExcessTaxBenefitFromShareBasedCompensationOperatingActivities	0	USD
CY2013	us-gaap	Exploration Abandonment And Impairment Expense ExplorationAbandonmentAndImpairmentExpense	5846000	USD
CY2012	us-gaap	Exploration Abandonment And Impairment Expense ExplorationAbandonmentAndImpairmentExpense	20861000	USD
CY2011	us-gaap	Exploration Abandonment And Impairment Expense ExplorationAbandonmentAndImpairmentExpense	277000	USD
CY2013	us-gaap	Exploration Expense ExplorationExpense	74104000	USD
CY2012	us-gaap	Exploration Expense ExplorationExpense	90248000	USD
CY2011	us-gaap	Exploration Expense ExplorationExpense	53537000	USD
CY2011	us-gaap	Income Tax Reconciliation Nondeductible Expense Depletion IncomeTaxReconciliationNondeductibleExpenseDepletion	-341000	USD
CY2012	us-gaap	Income Tax Reconciliation Nondeductible Expense Depletion IncomeTaxReconciliationNondeductibleExpenseDepletion	-210000	USD
CY2013	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	1230000	USD
CY2011	us-gaap	Gain Loss On Oil And Gas Hedging Activity GainLossOnOilAndGasHedgingActivity	-20707000	USD
CY2012	us-gaap	Gain Loss On Oil And Gas Hedging Activity GainLossOnOilAndGasHedgingActivity	3866000	USD
CY2013	us-gaap	Gain Loss On Oil And Gas Hedging Activity GainLossOnOilAndGasHedgingActivity	-1777000	USD
CY2011	us-gaap	Gain Loss On Sale Of Proved Property GainLossOnSaleOfProvedProperty	220676000	USD
CY2013	us-gaap	Gain Loss On Sale Of Proved Property GainLossOnSaleOfProvedProperty	27974000	USD
CY2012	us-gaap	Gain Loss On Sale Of Proved Property GainLossOnSaleOfProvedProperty	-27018000	USD
CY2013	us-gaap	Gas Gathering Transportation Marketing And Processing Costs GasGatheringTransportationMarketingAndProcessingCosts	57647000	USD
CY2012	us-gaap	Gas Gathering Transportation Marketing And Processing Costs GasGatheringTransportationMarketingAndProcessingCosts	47583000	USD
CY2011	us-gaap	Gas Gathering Transportation Marketing And Processing Costs GasGatheringTransportationMarketingAndProcessingCosts	64249000	USD
CY2011	us-gaap	Gas Gathering Transportation Marketing And Processing Revenue GasGatheringTransportationMarketingAndProcessingRevenue	69898000	USD
CY2013	us-gaap	Gas Gathering Transportation Marketing And Processing Revenue GasGatheringTransportationMarketingAndProcessingRevenue	60039000	USD
CY2012	us-gaap	Gas Gathering Transportation Marketing And Processing Revenue GasGatheringTransportationMarketingAndProcessingRevenue	52808000	USD
CY2012	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	119815000	USD
CY2011	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	118526000	USD
CY2013	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	149551000	USD
CY2012	us-gaap	Impairment Of Leasehold ImpairmentOfLeasehold	16342000	USD
CY2011	us-gaap	Impairment Of Leasehold ImpairmentOfLeasehold	7367000	USD
CY2013	us-gaap	Impairment Of Leasehold ImpairmentOfLeasehold	46105000	USD
CY2012	us-gaap	Impairment Of Oil And Gas Properties ImpairmentOfOilAndGasProperties	208923000	USD
CY2011	us-gaap	Impairment Of Oil And Gas Properties ImpairmentOfOilAndGasProperties	219037000	USD
CY2013	us-gaap	Impairment Of Oil And Gas Properties ImpairmentOfOilAndGasProperties	172641000	USD
CY2011	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	339001000	USD
CY2012	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-83517000	USD
CY2013	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	278611000	USD
CY2013Q4	us-gaap	Income Tax Examination Liability Refund Adjustment From Settlement With Taxing Authority IncomeTaxExaminationLiabilityRefundAdjustmentFromSettlementWithTaxingAuthority	4000000	USD
CY2012	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-29268000	USD
CY2013	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	107676000	USD
CY2011	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	123585000	USD
CY2013	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-314000	USD
CY2011	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	1627000	USD
CY2012	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	1524000	USD
CY2011	us-gaap	Interest Expense InterestExpense	45849000	USD
CY2013	us-gaap	Interest Expense InterestExpense	89711000	USD
CY2012	us-gaap	Interest Expense InterestExpense	63720000	USD
CY2013	us-gaap	Interest Income Operating InterestIncomeOperating	67000	USD
CY2012	us-gaap	Interest Income Operating InterestIncomeOperating	220000	USD
CY2011	us-gaap	Income Tax Reconciliation Tax Credits Research IncomeTaxReconciliationTaxCreditsResearch	4516000	USD
CY2013	us-gaap	Income Tax Reconciliation Tax Credits Research IncomeTaxReconciliationTaxCreditsResearch	0	USD
CY2012	us-gaap	Income Tax Reconciliation Tax Credits Research IncomeTaxReconciliationTaxCreditsResearch	970000	USD
CY2013	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	204000	USD
CY2011	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	4046000	USD
CY2012	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	1389000	USD
CY2013Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	4630000	USD
CY2012Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	3364000	USD
CY2011	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-18073000	USD
CY2012	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	31136000	USD
CY2013	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	93224000	USD
CY2013	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	78494000	USD
CY2012	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	21389000	USD
CY2011	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	41998000	USD
CY2012	us-gaap	Increase Decrease In Income Taxes Receivable IncreaseDecreaseInIncomeTaxesReceivable	-2217000	USD
CY2011	us-gaap	Increase Decrease In Income Taxes Receivable IncreaseDecreaseInIncomeTaxesReceivable	-2901000	USD
CY2013	us-gaap	Increase Decrease In Income Taxes Receivable IncreaseDecreaseInIncomeTaxesReceivable	1266000	USD
CY2013	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-1364000	USD
CY2011	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-16376000	USD
CY2012	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	1484000	USD
CY2013	us-gaap	Incremental Common Shares Attributable To Conversion Of Debt Securities IncrementalCommonSharesAttributableToConversionOfDebtSecurities	0	shares
CY2011	us-gaap	Incremental Common Shares Attributable To Conversion Of Debt Securities IncrementalCommonSharesAttributableToConversionOfDebtSecurities	1217000	shares
CY2012	us-gaap	Incremental Common Shares Attributable To Conversion Of Debt Securities IncrementalCommonSharesAttributableToConversionOfDebtSecurities	0	shares
CY2012	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	0	shares
CY2013	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1383000	shares
CY2011	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	2592000	shares
CY2013Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	10800000	USD
CY2012	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	12100000	USD
CY2011	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	10800000	USD
CY2013	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	11000000	USD
CY2011	us-gaap	Interest Income Operating InterestIncomeOperating	466000	USD
CY2013	us-gaap	Interest Paid InterestPaid	-70702000	USD
CY2012	us-gaap	Interest Paid InterestPaid	-51328000	USD
CY2011	us-gaap	Interest Paid InterestPaid	-22133000	USD
CY2012Q4	us-gaap	Inventory Raw Materials InventoryRawMaterials	13444000	USD
CY2013Q4	us-gaap	Inventory Raw Materials InventoryRawMaterials	15950000	USD
CY2012Q4	us-gaap	Inventory Raw Materials And Supplies Net Of Reserves InventoryRawMaterialsAndSuppliesNetOfReserves	13400000	USD
CY2013Q4	us-gaap	Inventory Raw Materials And Supplies Net Of Reserves InventoryRawMaterialsAndSuppliesNetOfReserves	16000000	USD
CY2012Q4	us-gaap	Land Land	1845000	USD
CY2013Q4	us-gaap	Land Land	1857000	USD
CY2013	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	30076000	USD
CY2013Q4	us-gaap	Oil And Gas Property Successful Effort Method Accumulated Depreciation Depletion And Amortization OilAndGasPropertySuccessfulEffortMethodAccumulatedDepreciationDepletionAndAmortization	2583698000	USD
CY2012Q4	us-gaap	Oil And Gas Property Successful Effort Method Accumulated Depreciation Depletion And Amortization OilAndGasPropertySuccessfulEffortMethodAccumulatedDepreciationDepletionAndAmortization	2376170000	USD
CY2013	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	5700000	USD
CY2011	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	3700000	USD
CY2012	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	5400000	USD
CY2013Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	4705165000	USD
CY2012Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	4199529000	USD
CY2012Q4	us-gaap	Liabilities Current LiabilitiesCurrent	541546000	USD
CY2013Q4	us-gaap	Liabilities Current LiabilitiesCurrent	639131000	USD
CY2013Q4	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	2459213000	USD
CY2012Q4	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	2243517000	USD
CY2013Q4	us-gaap	Line Of Credit Facility Amount Outstanding LineOfCreditFacilityAmountOutstanding	0	USD
CY2012Q4	us-gaap	Line Of Credit Facility Amount Outstanding LineOfCreditFacilityAmountOutstanding	340000000	USD
CY2013Q4	us-gaap	Litigation Reserve LitigationReserve	23100000	USD
CY2012Q4	us-gaap	Long Term Debt LongTermDebt	1100000000	USD
CY2013Q4	us-gaap	Long Term Debt LongTermDebt	1600000000	USD
CY2013	us-gaap	Long Term Purchase Commitment Time Period LongTermPurchaseCommitmentTimePeriod	12 years
CY2011	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	618495000	USD
CY2012	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	422096000	USD
CY2013	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	130711000	USD
CY2011	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1264910000	USD
CY2012	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1457333000	USD
CY2013	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1192903000	USD
CY2012	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	921969000	USD
CY2013	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1338514000	USD
CY2011	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	760532000	USD
CY2013Q3	us-gaap	Noncash Or Part Noncash Acquisition Net Nonmonetary Assets Acquired Liabilities Assumed1 NoncashOrPartNoncashAcquisitionNetNonmonetaryAssetsAcquiredLiabilitiesAssumed1	25000000	USD
CY2011	us-gaap	Oil And Gas Production Expense OilAndGasProductionExpense	290111000	USD
CY2012	us-gaap	Oil And Gas Production Expense OilAndGasProductionExpense	391872000	USD
CY2013	us-gaap	Oil And Gas Production Expense OilAndGasProductionExpense	597045000	USD
CY2011	us-gaap	Oil And Gas Sales Revenue OilAndGasSalesRevenue	1332392000	USD
CY2012	us-gaap	Oil And Gas Sales Revenue OilAndGasSalesRevenue	1473868000	USD
CY2013	us-gaap	Oil And Gas Sales Revenue OilAndGasSalesRevenue	2199550000	USD
CY2012	us-gaap	Operating Income Loss OperatingIncomeLoss	-20017000	USD
CY2013	us-gaap	Operating Income Loss OperatingIncomeLoss	368255000	USD
CY2011	us-gaap	Operating Income Loss OperatingIncomeLoss	384384000	USD
CY2012Q4	us-gaap	Operating Loss Carryforwards OperatingLossCarryforwards	113522000	USD
CY2013Q4	us-gaap	Operating Loss Carryforwards OperatingLossCarryforwards	91788000	USD
CY2013Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	70208000	USD
CY2012Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	78529000	USD
CY2011	us-gaap	Other Comprehensive Income Defined Benefit Plan Net Prior Service Cost Credit Arising During Period Before Tax OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostCreditArisingDuringPeriodBeforeTax	-170000	USD
CY2012	us-gaap	Other Comprehensive Income Defined Benefit Plan Net Prior Service Cost Credit Arising During Period Before Tax OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostCreditArisingDuringPeriodBeforeTax	0	USD
CY2013	us-gaap	Other Comprehensive Income Defined Benefit Plan Net Prior Service Cost Credit Arising During Period Before Tax OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostCreditArisingDuringPeriodBeforeTax	0	USD
CY2011	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent	2779000	USD
CY2012	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent	3909000	USD
CY2013	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent	-4005000	USD
CY2012	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	2470000	USD
CY2013	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	-2483000	USD
CY2011	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	1795000	USD
CY2012	us-gaap	Other Comprehensive Income Defined Benefit Plans Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent	1439000	USD
CY2011	us-gaap	Other Comprehensive Income Defined Benefit Plans Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent	984000	USD
CY2013	us-gaap	Other Comprehensive Income Defined Benefit Plans Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent	-1522000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Amortization Pension And Other Postretirement Benefit Plans Net Prior Service Cost Recognized In Net Periodic Benefit Cost Before Tax OtherComprehensiveIncomeLossAmortizationPensionAndOtherPostretirementBenefitPlansNetPriorServiceCostRecognizedInNetPeriodicBenefitCostBeforeTax	-17000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Amortization Pension And Other Postretirement Benefit Plans Net Prior Service Cost Recognized In Net Periodic Benefit Cost Before Tax OtherComprehensiveIncomeLossAmortizationPensionAndOtherPostretirementBenefitPlansNetPriorServiceCostRecognizedInNetPeriodicBenefitCostBeforeTax	0	USD
CY2012	us-gaap	Other Comprehensive Income Loss Amortization Pension And Other Postretirement Benefit Plans Net Prior Service Cost Recognized In Net Periodic Benefit Cost Before Tax OtherComprehensiveIncomeLossAmortizationPensionAndOtherPostretirementBenefitPlansNetPriorServiceCostRecognizedInNetPeriodicBenefitCostBeforeTax	-17000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	3598000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	11202000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-4734000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	-2779000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	-3909000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	4005000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Unamortized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax	-4680000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Unamortized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax	-3014000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Unamortized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax	2766000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Income Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentOnDerivativesIncludedInNetIncomeBeforeTax	20707000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Income Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentOnDerivativesIncludedInNetIncomeBeforeTax	-3865000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Income Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentOnDerivativesIncludedInNetIncomeBeforeTax	1777000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Income Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentOnDerivativesIncludedInNetIncomeNetOfTax	12997000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Income Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentOnDerivativesIncludedInNetIncomeNetOfTax	1115000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Income Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentOnDerivativesIncludedInNetIncomeNetOfTax	-2264000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Income Tax OtherComprehensiveIncomeLossReclassificationAdjustmentOnDerivativesIncludedInNetIncomeTax	7710000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Income Tax OtherComprehensiveIncomeLossReclassificationAdjustmentOnDerivativesIncludedInNetIncomeTax	-1601000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Income Tax OtherComprehensiveIncomeLossReclassificationAdjustmentOnDerivativesIncludedInNetIncomeTax	662000	USD
CY2013	us-gaap	Other Comprehensive Income Reclassification Of Defined Benefit Plans Net Gain Loss Recognized In Net Periodic Benefit Cost Net Of Tax OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossRecognizedInNetPeriodicBenefitCostNetOfTax	-1222000	USD
CY2011	us-gaap	Other Comprehensive Income Reclassification Of Defined Benefit Plans Net Gain Loss Recognized In Net Periodic Benefit Cost Net Of Tax OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossRecognizedInNetPeriodicBenefitCostNetOfTax	-405000	USD
CY2012	us-gaap	Other Comprehensive Income Reclassification Of Defined Benefit Plans Net Gain Loss Recognized In Net Periodic Benefit Cost Net Of Tax OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossRecognizedInNetPeriodicBenefitCostNetOfTax	-754000	USD
CY2011	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	17567000	USD
CY2011	us-gaap	Payments To Explore And Develop Oil And Gas Properties PaymentsToExploreAndDevelopOilAndGasProperties	1633093000	USD
CY2013	us-gaap	Payments To Explore And Develop Oil And Gas Properties PaymentsToExploreAndDevelopOilAndGasProperties	1553536000	USD
CY2012	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	6993000	USD
CY2012	us-gaap	Other Labor Related Expenses OtherLaborRelatedExpenses	-28904000	USD
CY2013	us-gaap	Other Labor Related Expenses OtherLaborRelatedExpenses	-21842000	USD
CY2011	us-gaap	Other Labor Related Expenses OtherLaborRelatedExpenses	-25477000	USD
CY2012Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	6920000	USD
CY2013Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	6000000	USD
CY2012Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	66357000	USD
CY2013Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	28771000	USD
CY2011	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	6027000	USD
CY2012	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-527000	USD
CY2013	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-2775000	USD
CY2012	us-gaap	Other Sales Revenue Net OtherSalesRevenueNet	1578000	USD
CY2013	us-gaap	Other Sales Revenue Net OtherSalesRevenueNet	7588000	USD
CY2011	us-gaap	Other Sales Revenue Net OtherSalesRevenueNet	1059000	USD
CY2013	us-gaap	Payments For Proceeds From Delayed Tax Exempt Exchange PaymentsForProceedsFromDelayedTaxExemptExchange	1754000	USD
CY2011	us-gaap	Payments For Proceeds From Delayed Tax Exempt Exchange PaymentsForProceedsFromDelayedTaxExemptExchange	0	USD
CY2012	us-gaap	Payments For Proceeds From Delayed Tax Exempt Exchange PaymentsForProceedsFromDelayedTaxExemptExchange	0	USD
CY2011	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-3661000	USD
CY2012	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-893000	USD
CY2013	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	859000	USD
CY2011	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	6382000	USD
CY2013	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	6663000	USD
CY2012	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	6511000	USD
CY2012	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	0	USD
CY2013	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	3444000	USD
CY2011	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	8719000	USD
CY2011	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	9973000	USD
CY2012	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	21622000	USD
CY2013	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	16220000	USD
CY2013	us-gaap	Payments To Acquire Oil And Gas Property And Equipment PaymentsToAcquireOilAndGasPropertyAndEquipment	61603000	USD
CY2012	us-gaap	Payments To Acquire Oil And Gas Property And Equipment PaymentsToAcquireOilAndGasPropertyAndEquipment	5773000	USD
CY2011	us-gaap	Payments To Acquire Oil And Gas Property And Equipment PaymentsToAcquireOilAndGasPropertyAndEquipment	0	USD
CY2012	us-gaap	Payments To Explore And Develop Oil And Gas Properties PaymentsToExploreAndDevelopOilAndGasProperties	1507828000	USD
CY2013Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	9944000	USD
CY2012Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	30017000	USD
CY2012	us-gaap	Price Risk Cash Flow Hedge Gain Or Loss Reclassified To Earnings Net PriceRiskCashFlowHedgeGainOrLossReclassifiedToEarningsNet	-2264000	USD
CY2011	us-gaap	Price Risk Cash Flow Hedge Gain Or Loss Reclassified To Earnings Net PriceRiskCashFlowHedgeGainOrLossReclassifiedToEarningsNet	12997000	USD
CY2013	us-gaap	Price Risk Cash Flow Hedge Gain Or Loss Reclassified To Earnings Net PriceRiskCashFlowHedgeGainOrLossReclassifiedToEarningsNet	1115000	USD
CY2013Q4	us-gaap	Price Risk Derivatives At Fair Value Net PriceRiskDerivativesAtFairValueNet	21500000	USD
CY2012Q4	us-gaap	Price Risk Derivatives At Fair Value Net PriceRiskDerivativesAtFairValueNet	38700000	USD
CY2013	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	6858000	USD
CY2012	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	5816000	USD
CY2013Q4	us-gaap	Property Plant And Equipment Salvage Value PropertyPlantAndEquipmentSalvageValue	57500000	USD
CY2012Q4	us-gaap	Property Plant And Equipment Salvage Value PropertyPlantAndEquipmentSalvageValue	64400000	USD
CY2012Q4	us-gaap	Property Plant And Equipment Other Net PropertyPlantAndEquipmentOtherNet	153559000	USD
CY2011	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	7327000	USD
CY2011	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	684242000	USD
CY2012	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	392138000	USD
CY2013	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	490185000	USD
CY2013	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	1203000000	USD
CY2011	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	322000000	USD
CY2012	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	1609000000	USD
CY2013	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-5000	USD
CY2011	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	0	USD
CY2012	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-225000	USD
CY2013	us-gaap	Proceeds From Sale Of Oil And Gas Property And Equipment ProceedsFromSaleOfOilAndGasPropertyAndEquipment	424849000	USD
CY2011	us-gaap	Proceeds From Sale Of Oil And Gas Property And Equipment ProceedsFromSaleOfOilAndGasPropertyAndEquipment	364522000	USD
CY2012	us-gaap	Proceeds From Sale Of Oil And Gas Property And Equipment ProceedsFromSaleOfOilAndGasPropertyAndEquipment	55375000	USD
CY2011	us-gaap	Profit Loss ProfitLoss	215416000	USD
CY2013	us-gaap	Profit Loss ProfitLoss	170935000	USD
CY2012	us-gaap	Profit Loss ProfitLoss	-54249000	USD
CY2012Q4	us-gaap	Projects That Have Exploratory Well Costs That Have Been Capitalized For Period Greater Than One Year ProjectsThatHaveExploratoryWellCostsThatHaveBeenCapitalizedForPeriodGreaterThanOneYear	0
CY2013Q4	us-gaap	Projects That Have Exploratory Well Costs That Have Been Capitalized For Period Greater Than One Year ProjectsThatHaveExploratoryWellCostsThatHaveBeenCapitalizedForPeriodGreaterThanOneYear	0
CY2011Q4	us-gaap	Projects That Have Exploratory Well Costs That Have Been Capitalized For Period Greater Than One Year ProjectsThatHaveExploratoryWellCostsThatHaveBeenCapitalizedForPeriodGreaterThanOneYear	2
CY2013	us-gaap	Property Plant And Equipment Estimated Useful Lives PropertyPlantAndEquipmentEstimatedUsefulLives	three to thirty years
CY2013	us-gaap	Property Plant And Equipment Impairment PropertyPlantAndEquipmentImpairment	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-bottom:16px;text-align:left;font-size:11pt;"><font style="font-family:inherit;font-size:11pt;font-style:italic;">Impairment of Proved and Unproved Properties</font></div><div style="line-height:120%;padding-bottom:16px;text-align:left;text-indent:48px;font-size:11pt;"><font style="font-family:inherit;font-size:11pt;">Proved oil and gas property costs are evaluated for impairment and reduced to fair value, which is based on expected future discounted cash flows, when there is an indication that the carrying costs may not be recoverable. Expected future cash flows are calculated on all developed proved reserves and risk adjusted proved undeveloped, probable, and possible reserves using a discount rate and price forecasts that management believes are representative of current market conditions. The prices for oil and gas are forecasted based on NYMEX strip pricing, adjusted for basis differentials, for the first </font><font style="font-family:inherit;font-size:11pt;color:#000000;text-decoration:none;">five</font><font style="font-family:inherit;font-size:11pt;"> years, after which a flat terminal price is used for each commodity stream. The prices for NGLs are forecasted using OPIS pricing, adjusted for basis differentials, for as long as the market is actively trading, after which a flat terminal price is used. Future operating costs are also adjusted as deemed appropriate for these estimates.</font><font style="font-family:inherit;font-size:10pt;"> </font><font style="font-family:inherit;font-size:11pt;">An impairment is recorded on unproved property when the Company determines that either the property will not be developed or the carrying value is not realizable.</font></div></div>
CY2012Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	3677197000	USD
CY2013Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	3859792000	USD
CY2013Q4	us-gaap	Property Plant And Equipment Other Net PropertyPlantAndEquipmentOtherNet	218395000	USD
CY2012Q4	us-gaap	Proved Oil And Gas Property Successful Effort Method ProvedOilAndGasPropertySuccessfulEffortMethod	5401684000	USD
CY2013Q4	us-gaap	Proved Oil And Gas Property Successful Effort Method ProvedOilAndGasPropertySuccessfulEffortMethod	5637462000	USD
CY2012Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	50581	shares
CY2011	us-gaap	Reclassification To Well Facilities And Equipment Based On Determination Of Proved Reserves ReclassificationToWellFacilitiesAndEquipmentBasedOnDeterminationOfProvedReserves	-32880000	USD
CY2013	us-gaap	Reclassification To Well Facilities And Equipment Based On Determination Of Proved Reserves ReclassificationToWellFacilitiesAndEquipmentBasedOnDeterminationOfProvedReserves	-9100000	USD
CY2012	us-gaap	Reclassification To Well Facilities And Equipment Based On Determination Of Proved Reserves ReclassificationToWellFacilitiesAndEquipmentBasedOnDeterminationOfProvedReserves	-5865000	USD
CY2011	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	370000000	USD
CY2013	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	1543000000	USD
CY2012	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	1269000000	USD
CY2013	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	0	USD
CY2012	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	287500000	USD
CY2011	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	0	USD
CY2012Q4	us-gaap	Restricted Cash And Cash Equivalents Noncurrent RestrictedCashAndCashEquivalentsNoncurrent	86773000	USD
CY2013Q4	us-gaap	Restricted Cash And Cash Equivalents Noncurrent RestrictedCashAndCashEquivalentsNoncurrent	96713000	USD
CY2013Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	1354669000	USD
CY2012Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	1190397000	USD
CY2013	us-gaap	Revenues Revenues	2293374000	USD
CY2011	us-gaap	Revenues Revenues	1603318000	USD
CY2012	us-gaap	Revenues Revenues	1505102000	USD
CY2013Q4	us-gaap	Senior Notes SeniorNotes	1600000000	USD
CY2012Q4	us-gaap	Senior Notes SeniorNotes	1100000000	USD
CY2013Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	3800000	shares
CY2012	us-gaap	Stock Issued During Period Value Conversion Of Convertible Securities StockIssuedDuringPeriodValueConversionOfConvertibleSecurities	2641000	USD
CY2012	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	2776000	USD
CY2013	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	3672000	USD
CY2011	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	2300000	USD
CY2013	us-gaap	Stock Issued During Period Value Other StockIssuedDuringPeriodValueOther	32347000	USD
CY2011	us-gaap	Stock Issued During Period Value Other StockIssuedDuringPeriodValueOther	26824000	USD
CY2012	us-gaap	Stock Issued During Period Value Other StockIssuedDuringPeriodValueOther	30185000	USD
CY2013	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	-16220000	USD
CY2012	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	-21622000	USD
CY2011	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	-9973000	USD
CY2012	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	3040000	USD
CY2011	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	5027000	USD
CY2013	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	3186000	USD
CY2013Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1606821000	USD
CY2012Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1414466000	USD
CY2011Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1462940000	USD
CY2010Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1218526000	USD
CY2012Q4	sm	A650 Senior Notes Due2023 A650SeniorNotesDue2023	400000000	USD
CY2013Q4	sm	A6625 Senior Notes Due2019 A6625SeniorNotesDue2019	350000000	USD
CY2013Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	22412	shares
CY2013Q4	us-gaap	Treasury Stock Value TreasuryStockValue	823000	USD
CY2012Q4	us-gaap	Treasury Stock Value TreasuryStockValue	1221000	USD
CY2012Q4	us-gaap	Unproved Oil And Gas Property Successful Effort Method UnprovedOilAndGasPropertySuccessfulEffortMethod	175287000	USD
CY2013Q4	us-gaap	Unproved Oil And Gas Property Successful Effort Method UnprovedOilAndGasPropertySuccessfulEffortMethod	271100000	USD
CY2012	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	55630000	USD
CY2011	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	37086000	USD
CY2013	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	3080000	USD
CY2012	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	0	USD
CY2013	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	0	USD
CY2011	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	1172000	USD
CY2012	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	317000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	183000	USD
CY2013	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	80000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	-201000	USD
CY2012	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	0	USD
CY2013	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	0	USD
CY2011Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	1961000	USD
CY2013Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	2358000	USD
CY2012Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	2278000	USD
CY2010Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	807000	USD
CY2013	us-gaap	Use Of Estimates UseOfEstimates	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-bottom:16px;text-align:left;font-size:11pt;"><font style="font-family:inherit;font-size:11pt;font-style:italic;">Use of Estimates in the Preparation of Financial Statements</font></div><div style="line-height:120%;padding-bottom:16px;text-align:left;text-indent:48px;font-size:11pt;"><font style="font-family:inherit;font-size:11pt;">The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of proved oil and gas reserves, assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Estimates of proved oil and gas reserve quantities provide the basis for the calculation of depletion, depreciation, and amortization expense, impairment of proved properties, asset retirement obligations, and the Net Profits Interest Bonus Plan (“Net Profits Plan”) liability, each of which represents a significant component of the accompanying consolidated financial statements.</font></div></div>
CY2011	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	3809000	shares
CY2012	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	0	shares
CY2013	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	1383000	shares
CY2013	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	67998000	shares
CY2012	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	65138000	shares
CY2011	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	67564000	shares
CY2013	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	66615000	shares
CY2012	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	65138000	shares
CY2011	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	63755000	shares
CY2013Q4	us-gaap	Wells In Process Of Drilling WellsInProcessOfDrilling	279654000	USD
CY2012Q4	us-gaap	Wells In Process Of Drilling WellsInProcessOfDrilling	273928000	USD
CY2013Q4	sm	A5 Senior Notes Due2024 A5SeniorNotesDue2024	500000000	USD
CY2012Q4	sm	A5 Senior Notes Due2024 A5SeniorNotesDue2024	0	USD
CY2012Q4	sm	A650 Senior Notes Due2021 A650SeniorNotesDue2021	350000000	USD
CY2013Q4	sm	A650 Senior Notes Due2021 A650SeniorNotesDue2021	350000000	USD
CY2013Q4	sm	A650 Senior Notes Due2023 A650SeniorNotesDue2023	400000000	USD
CY2013	sm	Depletion Depreciation Amortization And Asset Retirement Obligation Liability Accretion Cash Flow Impact DepletionDepreciationAmortizationAndAssetRetirementObligationLiabilityAccretionCashFlowImpact	822872000	USD
CY2012Q4	sm	A6625 Senior Notes Due2019 A6625SeniorNotesDue2019	350000000	USD
CY2013Q4	sm	Asset Retirement Obligations Assets Held For Sale Noncurrent AssetRetirementObligationsAssetsHeldForSaleNoncurrent	3033000	USD
CY2012Q4	sm	Asset Retirement Obligations Assets Held For Sale Noncurrent AssetRetirementObligationsAssetsHeldForSaleNoncurrent	1393000	USD
CY2013	sm	Assets Held For Sale Reasonably Certain Period For Sale AssetsHeldForSaleReasonablyCertainPeriodForSale	1
CY2013	sm	Capitalizationof Developmentand Implementationof Internal Use Software CapitalizationofDevelopmentandImplementationofInternalUseSoftware	11200000	USD
CY2013	sm	Cash Settlement Gain Loss On Derivative Instruments CashSettlementGainLossOnDerivativeInstruments	-22062000	USD
CY2011	sm	Cash Settlement Gain Loss On Derivative Instruments CashSettlementGainLossOnDerivativeInstruments	25671000	USD
CY2012	sm	Cash Settlement Gain Loss On Derivative Instruments CashSettlementGainLossOnDerivativeInstruments	-44264000	USD
CY2013Q4	sm	Deferred Tax Assets Net Profits Plan Liability DeferredTaxAssetsNetProfitsPlanLiability	20913000	USD
CY2012Q4	sm	Deferred Tax Assets Net Profits Plan Liability DeferredTaxAssetsNetProfitsPlanLiability	29233000	USD
CY2012Q4	sm	Deferred Tax Assets Other Long Term Liabilities DeferredTaxAssetsOtherLongTermLiabilities	16739000	USD
CY2013Q4	sm	Deferred Tax Assets Other Long Term Liabilities DeferredTaxAssetsOtherLongTermLiabilities	13341000	USD
CY2012Q4	sm	Defined Benefit Plan Accumulated Unfunded Benefit Obligation DefinedBenefitPlanAccumulatedUnfundedBenefitObligation	9183000	USD
CY2013Q4	sm	Defined Benefit Plan Accumulated Unfunded Benefit Obligation DefinedBenefitPlanAccumulatedUnfundedBenefitObligation	7738000	USD
CY2013Q4	sm	Defined Benefit Plan Annual Vesting Increment DefinedBenefitPlanAnnualVestingIncrement	0.20
CY2013	sm	Defined Benefit Plan Benefits Paid Qualified Pension Plan DefinedBenefitPlanBenefitsPaidQualifiedPensionPlan	-3293000	USD
CY2012	sm	Defined Benefit Plan Benefits Paid Qualified Pension Plan DefinedBenefitPlanBenefitsPaidQualifiedPensionPlan	-1018000	USD
CY2011	sm	Defined Benefit Plan Benefits Paid Qualified Pension Plan DefinedBenefitPlanBenefitsPaidQualifiedPensionPlan	-1500000	USD
CY2013Q4	sm	Defined Benefit Plan Percent Vested After Two Years Of Service DefinedBenefitPlanPercentVestedAfterTwoYearsOfService	0.40
CY2013Q4	sm	Defined Benefit Plan Years Of Service Required For Initial Vesting DefinedBenefitPlanYearsOfServiceRequiredForInitialVesting	2
CY2011	sm	Depletion Depreciation Amortization And Asset Retirement Obligation Liability Accretion DepletionDepreciationAmortizationAndAssetRetirementObligationLiabilityAccretion	511103000	USD
CY2012	sm	Depletion Depreciation Amortization And Asset Retirement Obligation Liability Accretion DepletionDepreciationAmortizationAndAssetRetirementObligationLiabilityAccretion	727877000	USD
CY2013	sm	Depletion Depreciation Amortization And Asset Retirement Obligation Liability Accretion DepletionDepreciationAmortizationAndAssetRetirementObligationLiabilityAccretion	822872000	USD
CY2011	sm	Depletion Depreciation Amortization And Asset Retirement Obligation Liability Accretion Cash Flow Impact DepletionDepreciationAmortizationAndAssetRetirementObligationLiabilityAccretionCashFlowImpact	511103000	USD
CY2012	sm	Depletion Depreciation Amortization And Asset Retirement Obligation Liability Accretion Cash Flow Impact DepletionDepreciationAmortizationAndAssetRetirementObligationLiabilityAccretionCashFlowImpact	727877000	USD
CY2012Q4	sm	Derivative Asset Fair Value Amount Offset Against Collateral Net DerivativeAssetFairValueAmountOffsetAgainstCollateralNet	40939000	USD
CY2013Q4	sm	Derivative Asset Fair Value Amount Offset Against Collateral Net DerivativeAssetFairValueAmountOffsetAgainstCollateralNet	21858000	USD
CY2011	sm	Derivative Gain Loss DerivativeGainLoss	37086000	USD
CY2013	sm	Derivative Gain Loss DerivativeGainLoss	3080000	USD
CY2012	sm	Derivative Gain Loss DerivativeGainLoss	55630000	USD
CY2013Q4	sm	Derivative Liability Fair Value Amount Offset Against Collateral Net DerivativeLiabilityFairValueAmountOffsetAgainstCollateralNet	-368000	USD
CY2012Q4	sm	Derivative Liability Fair Value Amount Offset Against Collateral Net DerivativeLiabilityFairValueAmountOffsetAgainstCollateralNet	-2244000	USD
CY2013Q4	sm	Pension And Other Post Retirement Benefit Plans Gain Loss Amortization Threshold PensionAndOtherPostRetirementBenefitPlansGainLossAmortizationThreshold	0.10
CY2013	sm	Period Of New York Mercantile Exchange Strip Pricing Used For Price Forecast PeriodOfNewYorkMercantileExchangeStripPricingUsedForPriceForecast	5
CY2013Q4	sm	Revenue Receipt Days After Sale High End Of Range RevenueReceiptDaysAfterSaleHighEndOfRange	90
CY2013Q4	sm	Revenue Receipt Days After Sale Low End Of Range RevenueReceiptDaysAfterSaleLowEndOfRange	30
CY2013Q4	sm	Discount Rate Used For Fair Value Of Oil And Gas Properties DiscountRateUsedForFairValueOfOilAndGasProperties	0.12
CY2013	sm	Eagleford Non Operated Development Commitment EaglefordNonOperatedDevelopmentCommitment	33000000	USD
CY2011	sm	Employee Service Share Bassed Compensation Cash Received From Exercise All Grant Types EmployeeServiceShareBassedCompensationCashReceivedFromExerciseAllGrantTypes	5000000	USD
CY2012	sm	Employee Service Share Bassed Compensation Cash Received From Exercise All Grant Types EmployeeServiceShareBassedCompensationCashReceivedFromExerciseAllGrantTypes	3000000	USD
CY2013	sm	Employee Service Share Bassed Compensation Cash Received From Exercise All Grant Types EmployeeServiceShareBassedCompensationCashReceivedFromExerciseAllGrantTypes	3200000	USD
CY2013	sm	Irs Proposed Rd Tax Adjustment IRSProposedRDTaxAdjustment	4600000	USD
CY2013	sm	Impact Of Issuance Of One Performance Share Award On Available Shares Under Equity Incentive Plan ImpactOfIssuanceOfOnePerformanceShareAwardOnAvailableSharesUnderEquityIncentivePlan	2	shares
CY2013	sm	Impact Outright Issuance Of One Share Has On Number Of Available Shares ImpactOutrightIssuanceOfOneShareHasOnNumberOfAvailableShares	1	shares
CY2013	sm	Number Of Counterparties Downgraded NumberOfCounterpartiesDowngraded	3
CY2013Q4	sm	Number Of Derivative Counterparties NumberOfDerivativeCounterparties	10
CY2012	sm	Number Of Major Customers NumberOfMajorCustomers	2
CY2013	sm	Number Of Major Customers NumberOfMajorCustomers	3
CY2011	sm	Number Of Major Customers NumberOfMajorCustomers	1
CY2013	sm	Otherincometaxbenefit Otherincometaxbenefit	1500000	USD
CY2013	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2013Q2	dei	Entity Public Float EntityPublicFloat	3929174218.54	USD
CY2013	dei	Entity Registrant Name EntityRegistrantName	SM Energy Co
CY2013	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2013	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2013Q4	sm	Unrecognized Tax Benefits Exercise Of Stock Awards UnrecognizedTaxBenefitsExerciseOfStockAwards	126700000	USD
CY2013	dei	Amendment Flag AmendmentFlag	false
CY2013	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2013	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2013	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2013
CY2013	dei	Document Period End Date DocumentPeriodEndDate	2013-12-31
CY2013	dei	Document Type DocumentType	10-K
CY2013	dei	Entity Central Index Key EntityCentralIndexKey	0000893538
CY2014Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	67056441	shares
CY2013	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes

Files In Submission

Name	View Source	Status
0000893538-14-000010-index-headers.html	Edgar Link	pending
0000893538-14-000010-index.html	Edgar Link	pending
0000893538-14-000010.txt	Edgar Link	pending
0000893538-14-000010-xbrl.zip	Edgar Link	pending
a2013relativeperformancegrap.jpg	Edgar Link	pending
exhibit1041-cashbonusplan.htm	Edgar Link	pending
exhibit1042-summaryofcompe.htm	Edgar Link	pending
exhibit121-ratioofearnings.htm	Edgar Link	pending
exhibit211-subsidiaries123.htm	Edgar Link	pending
exhibit231-consentofpublic.htm	Edgar Link	pending
exhibit232-consentofpublic.htm	Edgar Link	pending
exhibit233-consentofindepe.htm	Edgar Link	pending
exhibit24-envervestpurchas.htm	Edgar Link	pending
exhibit311-certificationtb.htm	Edgar Link	pending
exhibit312-certificationwp.htm	Edgar Link	pending
exhibit321-906ceritificati.htm	Edgar Link	pending
exhibit991-ryderscottlette.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xls	Edgar Link	pending
Financial_Report.xlsx	Edgar Link	pending
R1.htm	Edgar Link	pending
R10.htm	Edgar Link	pending
R11.htm	Edgar Link	pending
R12.htm	Edgar Link	pending
R13.htm	Edgar Link	pending
R14.htm	Edgar Link	pending
R15.htm	Edgar Link	pending
R16.htm	Edgar Link	pending
R17.htm	Edgar Link	pending
R18.htm	Edgar Link	pending
R19.htm	Edgar Link	pending
R2.htm	Edgar Link	pending
R20.htm	Edgar Link	pending
R21.htm	Edgar Link	pending
R22.htm	Edgar Link	pending
R23.htm	Edgar Link	pending
R24.htm	Edgar Link	pending
R25.htm	Edgar Link	pending
R26.htm	Edgar Link	pending
R27.htm	Edgar Link	pending
R28.htm	Edgar Link	pending
R29.htm	Edgar Link	pending
R3.htm	Edgar Link	pending
R30.htm	Edgar Link	pending
R31.htm	Edgar Link	pending
R32.htm	Edgar Link	pending
R33.htm	Edgar Link	pending
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R35.htm	Edgar Link	pending
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R37.htm	Edgar Link	pending
R38.htm	Edgar Link	pending
R39.htm	Edgar Link	pending
R4.htm	Edgar Link	pending
R40.htm	Edgar Link	pending
R41.htm	Edgar Link	pending
R42.htm	Edgar Link	pending
R43.htm	Edgar Link	pending
R44.htm	Edgar Link	pending
R45.htm	Edgar Link	pending
R46.htm	Edgar Link	pending
R47.htm	Edgar Link	pending
R48.htm	Edgar Link	pending
R49.htm	Edgar Link	pending
R5.htm	Edgar Link	pending
R50.htm	Edgar Link	pending
R51.htm	Edgar Link	pending
R52.htm	Edgar Link	pending
R53.htm	Edgar Link	pending
R54.htm	Edgar Link	pending
R55.htm	Edgar Link	pending
R56.htm	Edgar Link	pending
R57.htm	Edgar Link	pending
R58.htm	Edgar Link	pending
R59.htm	Edgar Link	pending
R6.htm	Edgar Link	pending
R60.htm	Edgar Link	pending
R7.htm	Edgar Link	pending
R8.htm	Edgar Link	pending
R9.htm	Edgar Link	pending
report.css	Edgar Link	pending
ryderscott.jpg	Edgar Link	pending
sealryder.jpg	Edgar Link	pending
Show.js	Edgar Link	pending
sm-20131231.xml	Edgar Link	completed
sm-20131231.xsd	Edgar Link	pending
sm-20131231x10k.htm	Edgar Link	pending
sm-20131231_cal.xml	Edgar Link	unprocessable
sm-20131231_def.xml	Edgar Link	unprocessable
sm-20131231_lab.xml	Edgar Link	unprocessable
sm-20131231_pre.xml	Edgar Link	unprocessable

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$SM
SM Energy Co Stock $sm

2013 Q4 Form 10-K Financial Statement

#000089353814000010 Filed on February 19, 2014

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$SM SM Energy Co Stock $sm

2013 Q4 Form 10-K Financial Statement

#000089353814000010 Filed on February 19, 2014

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$SM
SM Energy Co Stock $sm