$CHRD
Chord Energy Corp Stock $chrd

$chrd Overview Financials Valuation SEC Filings Company Website

2013 Q4 Form 10-K Financial Statement

#000148615914000011 Filed on February 27, 2014

Income Statement

Concept	2013 Q4	2012 Q4	2012 Q3
Revenue	$333.6M	$214.3M	$184.7M
YoY Change	55.66%	83.38%	110.87%
Cost Of Revenue	$76.10M	$41.20M	$38.00M
YoY Change	84.71%	76.07%	105.41%
Gross Profit	$257.5M	$173.2M	$146.7M
YoY Change	48.67%	85.24%	112.3%
Gross Profit Margin	77.18%	80.81%	79.42%
Selling, General & Admin	$34.10M	$19.50M	$16.60M
YoY Change	74.87%	93.07%	121.33%
% of Gross Profit	13.24%	11.26%	11.32%
Research & Development	-$500.0K	$100.0K	$300.0K
YoY Change	-600.0%	-92.31%	200.0%
% of Gross Profit	-0.19%	0.06%	0.2%
Depreciation & Amortization	$101.3M	$65.90M	$57.68M
YoY Change	53.72%	142.28%	176.54%
% of Gross Profit	39.34%	38.05%	39.32%
Operating Expenses	$135.0M	$85.50M	$74.70M
YoY Change	57.89%	121.5%	163.03%
Operating Profit	$122.1M	$86.62M	$72.04M
YoY Change	41.0%	59.41%	78.87%
Interest Expense	-$35.30M	-$20.60M	$20.98M
YoY Change	71.36%	-73.04%	209.15%
% of Operating Profit	-28.9%	-23.78%	29.12%
Other Income/Expense, Net	$100.0K	$2.300M	-$42.27M
YoY Change	-95.65%	475.0%	-165.07%
Pretax Income	$86.90M	$68.40M	$29.77M
YoY Change	27.05%	-416.67%	-71.72%
Income Tax	$32.40M	$25.80M	$11.45M
% Of Pretax Income	37.28%	37.72%	38.47%
Net Earnings	$54.49M	$42.59M	$18.31M
YoY Change	27.94%	-417.82%	-72.37%
Net Earnings / Revenue	16.33%	19.87%	9.92%
Basic Earnings Per Share			$0.20
Diluted Earnings Per Share	$0.57	$0.46	$0.20
COMMON SHARES
Basic Shares Outstanding	93.70M shares	93.37M shares	92.19M shares
Diluted Shares Outstanding			92.42M shares

Balance Sheet

Concept	2013 Q4	2012 Q4	2012 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$91.90M	$239.3M	$406.5M
YoY Change	-61.6%	-51.25%	40.9%
Cash & Equivalents	$91.90M	$213.4M	$280.3M
Short-Term Investments	$0.00	$25.90M	$126.2M
Other Short-Term Assets	$391.0K	$335.0K	$78.00K
YoY Change	16.72%	-31.77%	-99.77%
Inventory	$20.65M	$20.71M	$21.14M
Prepaid Expenses	$10.19M	$1.770M	$4.030M
Receivables	$175.7M	$110.3M	$105.0M
Other Receivables	$800.0K	$2.000M	$4.000M
Total Short-Term Assets	$447.6M	$492.7M	$641.7M
YoY Change	-9.15%	-21.0%	50.81%
LONG-TERM ASSETS
Property, Plant & Equipment	$4.080B	$2.007B	$1.804B
YoY Change	103.32%	85.8%	112.34%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets	$184.6M	$29.50M	$35.40M
YoY Change	525.76%	23.95%	-10.15%
Total Long-Term Assets	$4.230B	$2.036B	$1.839B
YoY Change	107.77%	84.47%	106.91%
TOTAL ASSETS
Total Short-Term Assets	$447.6M	$492.7M	$641.7M
Total Long-Term Assets	$4.230B	$2.036B	$1.839B
Total Assets	$4.678B	$2.529B	$2.481B
YoY Change	84.99%	46.39%	88.75%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$8.920M	$12.49M	$30.95M
YoY Change	-28.59%	2.33%	-29.33%
Accrued Expenses	$241.8M	$189.9M	$200.5M
YoY Change	27.37%	58.63%	129.98%
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	$466.4M	$330.8M	$355.0M
YoY Change	41.0%	81.17%	110.16%
LONG-TERM LIABILITIES
Long-Term Debt	$2.536B	$1.200B	$1.200B
YoY Change	111.3%	50.0%	200.0%
Other Long-Term Liabilities	$2.183M	$1.997M	$2.078M
YoY Change	9.31%	100.3%	-83.51%
Total Long-Term Liabilities	$2.538B	$1.202B	$1.202B
YoY Change	111.13%	50.06%	191.34%
TOTAL LIABILITIES
Total Short-Term Liabilities	$466.4M	$330.8M	$355.0M
Total Long-Term Liabilities	$2.538B	$1.202B	$1.202B
Total Liabilities	$3.363B	$1.734B	$1.731B
YoY Change	93.99%	58.61%	159.14%
SHAREHOLDERS EQUITY
Retained Earnings	$367.9M	$139.9M	$97.34M
YoY Change	162.91%	-1140.01%
Common Stock	$986.0M	$658.9M	$654.9M
YoY Change	49.65%	1.63%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$1.349B	$795.0M	$750.4M
YoY Change
Total Liabilities & Shareholders Equity	$4.712B	$2.529B	$2.481B
YoY Change	86.33%	46.39%	88.75%

Cashflow Statement

Concept	2013 Q4	2012 Q4	2012 Q3
OPERATING ACTIVITIES
Net Income	$54.49M	$42.59M	$18.31M
YoY Change	27.94%	-417.82%	-72.37%
Depreciation, Depletion And Amortization	$101.3M	$65.90M	$57.68M
YoY Change	53.72%	142.28%	176.54%
Cash From Operating Activities	$161.2M	$110.3M	$110.2M
YoY Change	46.15%	203.86%	193.09%
INVESTING ACTIVITIES
Capital Expenditures	$1.666B	$275.9M	$336.6M
YoY Change	503.99%	21.92%	92.78%
Acquisitions
YoY Change
Other Investing Activities	$982.8M	$100.7M	-$124.9M
YoY Change	875.97%	-4.91%	-17942.86%
Cash From Investing Activities	-$683.6M	-$175.2M	-$461.5M
YoY Change	290.18%	45.51%	165.23%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	488.8M	-1.900M	392.7M
YoY Change	-25826.32%	-100.49%
NET CHANGE
Cash From Operating Activities	161.2M	110.3M	110.2M
Cash From Investing Activities	-683.6M	-175.2M	-461.5M
Cash From Financing Activities	488.8M	-1.900M	392.7M
Net Change In Cash	-33.60M	-66.80M	41.40M
YoY Change	-49.7%	-121.74%	-130.35%
FREE CASH FLOW
Cash From Operating Activities	$161.2M	$110.3M	$110.2M
Capital Expenditures	$1.666B	$275.9M	$336.6M
Free Cash Flow	-$1.505B	-$165.6M	-$226.4M
YoY Change	808.94%	-12.84%	65.26%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2013Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	8920000	USD
CY2012Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	12491000	USD
CY2012Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	110341000	USD
CY2013Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	175653000	USD
CY2011	us-gaap	Accretion Of Discount AccretionOfDiscount	69782000	USD
CY2013	us-gaap	Accretion Of Discount AccretionOfDiscount	346068000	USD
CY2012	us-gaap	Accretion Of Discount AccretionOfDiscount	190370000	USD
CY2013Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	241830000	USD
CY2012Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	189863000	USD
CY2012Q4	us-gaap	Accrued Royalties Current AccruedRoyaltiesCurrent	27800000	USD
CY2013Q4	us-gaap	Accrued Royalties Current AccruedRoyaltiesCurrent	44700000	USD
CY2012Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	391260000	USD
CY2013Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	637676000	USD
CY2012Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	657943000	USD
CY2013Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	985023000	USD
CY2013	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	1346000	USD
CY2013	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	1566000	USD
CY2011	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	602000	USD
CY2012	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	3194000	USD
CY2013	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	4500000	USD
CY2012	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	3000000	USD
CY2011	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	1700000	USD
CY2013	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	634000	shares
CY2011	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	160000	shares
CY2012	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	465000	shares
CY2013Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	36458000	USD
CY2011Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	13075000	USD
CY2012Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	23234000	USD
CY2012	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	872000	USD
CY2013	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	11665000	USD
CY2012	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	7585000	USD
CY2013	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	0	USD
CY2012	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	71000	USD
CY2012	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	1773000	USD
CY2013	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	213000	USD
CY2012Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	22956000	USD
CY2013Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	35918000	USD
CY2013Q4	us-gaap	Assets Assets	4711924000	USD
CY2012Q4	us-gaap	Assets Assets	2528794000	USD
CY2013Q4	us-gaap	Assets Current AssetsCurrent	447606000	USD
CY2012Q4	us-gaap	Assets Current AssetsCurrent	492686000	USD
CY2013	us-gaap	Capitalized Exploratory Well Cost Additions Pending Determination Of Proved Reserves CapitalizedExploratoryWellCostAdditionsPendingDeterminationOfProvedReserves	346814000	USD
CY2011	us-gaap	Capitalized Exploratory Well Cost Additions Pending Determination Of Proved Reserves CapitalizedExploratoryWellCostAdditionsPendingDeterminationOfProvedReserves	73947000	USD
CY2012Q4	us-gaap	Capitalized Exploratory Well Costs CapitalizedExploratoryWellCosts	40424000	USD
CY2012Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	90384000	USD
CY2013Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	4339000	USD
CY2012Q4	us-gaap	Assets Held For Sale Long Lived AssetsHeldForSaleLongLived	0	USD
CY2013Q4	us-gaap	Assets Held For Sale Long Lived AssetsHeldForSaleLongLived	137066000	USD
CY2013	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	34354000	USD
CY2011	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	58205000	USD
CY2012	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	59878000	USD
CY2013Q4	us-gaap	Capitalized Costs Accumulated Depreciation Depletion Amortization And Valuation Allowance For Relating To Oil And Gas Producing Activities CapitalizedCostsAccumulatedDepreciationDepletionAmortizationAndValuationAllowanceForRelatingToOilAndGasProducingActivities	612380000	USD
CY2012Q4	us-gaap	Capitalized Costs Accumulated Depreciation Depletion Amortization And Valuation Allowance For Relating To Oil And Gas Producing Activities CapitalizedCostsAccumulatedDepreciationDepletionAmortizationAndValuationAllowanceForRelatingToOilAndGasProducingActivities	383564000	USD
CY2013Q4	us-gaap	Capitalized Costs Asset Retirement Costs CapitalizedCostsAssetRetirementCosts	32600000	USD
CY2012Q4	us-gaap	Capitalized Costs Asset Retirement Costs CapitalizedCostsAssetRetirementCosts	20700000	USD
CY2012Q4	us-gaap	Capitalized Costs Oil And Gas Producing Activities Net CapitalizedCostsOilAndGasProducingActivitiesNet	1964564000	USD
CY2013Q4	us-gaap	Capitalized Costs Oil And Gas Producing Activities Net CapitalizedCostsOilAndGasProducingActivitiesNet	3916578000	USD
CY2012Q4	us-gaap	Capitalized Costs Proved Properties CapitalizedCostsProvedProperties	2271711000	USD
CY2013Q4	us-gaap	Capitalized Costs Proved Properties CapitalizedCostsProvedProperties	3713525000	USD
CY2013Q4	us-gaap	Capitalized Costs Unproved Properties CapitalizedCostsUnprovedProperties	815433000	USD
CY2012Q4	us-gaap	Capitalized Costs Unproved Properties CapitalizedCostsUnprovedProperties	76417000	USD
CY2012	us-gaap	Capitalized Exploratory Well Cost Additions Pending Determination Of Proved Reserves CapitalizedExploratoryWellCostAdditionsPendingDeterminationOfProvedReserves	160813000	USD
CY2011Q4	us-gaap	Capitalized Exploratory Well Costs CapitalizedExploratoryWellCosts	20207000	USD
CY2010Q4	us-gaap	Capitalized Exploratory Well Costs CapitalizedExploratoryWellCosts	5176000	USD
CY2013Q4	us-gaap	Capitalized Exploratory Well Costs CapitalizedExploratoryWellCosts	123215000	USD
CY2013Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	91901000	USD
CY2012Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	213447000	USD
CY2011Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	470872000	USD
CY2009Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	143520000	USD
CY2010Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	143520000	USD
CY2013	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-121546000	USD
CY2011	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	327352000	USD
CY2012	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-257425000	USD
CY2013Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2012Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2013Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2012Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2012Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	300000000	shares
CY2013Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	300000000	shares
CY2012Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	93432712	shares
CY2013Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	100866589	shares
CY2012Q4	us-gaap	Common Stock Value CommonStockValue	925000	USD
CY2013Q4	us-gaap	Common Stock Value CommonStockValue	996000	USD
CY2012	us-gaap	Costs And Expenses CostsAndExpenses	409675000	USD
CY2013	us-gaap	Costs And Expenses CostsAndExpenses	637601000	USD
CY2011	us-gaap	Costs And Expenses CostsAndExpenses	177855000	USD
CY2011	us-gaap	Costs Incurred Acquisition Of Oil And Gas Properties CostsIncurredAcquisitionOfOilAndGasProperties	644030000	USD
CY2012	us-gaap	Costs Incurred Acquisition Of Oil And Gas Properties CostsIncurredAcquisitionOfOilAndGasProperties	1124307000	USD
CY2013	us-gaap	Costs Incurred Acquisition Of Oil And Gas Properties CostsIncurredAcquisitionOfOilAndGasProperties	2494256000	USD
CY2011	us-gaap	Costs Incurred Acquisition Of Oil And Gas Properties With Proved Reserves CostsIncurredAcquisitionOfOilAndGasPropertiesWithProvedReserves	3356000	USD
CY2013	us-gaap	Costs Incurred Acquisition Of Oil And Gas Properties With Proved Reserves CostsIncurredAcquisitionOfOilAndGasPropertiesWithProvedReserves	752454000	USD
CY2012	us-gaap	Costs Incurred Acquisition Of Oil And Gas Properties With Proved Reserves CostsIncurredAcquisitionOfOilAndGasPropertiesWithProvedReserves	3159000	USD
CY2013	us-gaap	Costs Incurred Acquisition Of Unproved Oil And Gas Properties CostsIncurredAcquisitionOfUnprovedOilAndGasProperties	837419000	USD
CY2012	us-gaap	Costs Incurred Acquisition Of Unproved Oil And Gas Properties CostsIncurredAcquisitionOfUnprovedOilAndGasProperties	34098000	USD
CY2011	us-gaap	Costs Incurred Acquisition Of Unproved Oil And Gas Properties CostsIncurredAcquisitionOfUnprovedOilAndGasProperties	15197000	USD
CY2013	us-gaap	Costs Incurred Asset Retirement Obligation Incurred CostsIncurredAssetRetirementObligationIncurred	11856000	USD
CY2011	us-gaap	Costs Incurred Asset Retirement Obligation Incurred CostsIncurredAssetRetirementObligationIncurred	5055000	USD
CY2012	us-gaap	Costs Incurred Asset Retirement Obligation Incurred CostsIncurredAssetRetirementObligationIncurred	9359000	USD
CY2012	us-gaap	Costs Incurred Development Costs CostsIncurredDevelopmentCosts	1074441000	USD
CY2011	us-gaap	Costs Incurred Development Costs CostsIncurredDevelopmentCosts	618737000	USD
CY2013	us-gaap	Costs Incurred Development Costs CostsIncurredDevelopmentCosts	890267000	USD
CY2012	us-gaap	Costs Incurred Exploration Costs CostsIncurredExplorationCosts	3250000	USD
CY2011	us-gaap	Costs Incurred Exploration Costs CostsIncurredExplorationCosts	1685000	USD
CY2013	us-gaap	Costs Incurred Exploration Costs CostsIncurredExplorationCosts	2260000	USD
CY2012	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	0	USD
CY2013	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	475000	USD
CY2011	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	0	USD
CY2013	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	475000	USD
CY2011	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	0	USD
CY2012	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	7000	USD
CY2011	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	0	USD
CY2012	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	7000	USD
CY2013	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	0	USD
CY2011	us-gaap	Decrease Due To Sales Of Minerals In Place DecreaseDueToSalesOfMineralsInPlace	2499000	USD
CY2013Q4	us-gaap	Deferred Costs And Other Assets DeferredCostsAndOtherAssets	46169000	USD
CY2012Q4	us-gaap	Deferred Costs And Other Assets DeferredCostsAndOtherAssets	24527000	USD
CY2012	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	82841000	USD
CY2011	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	42809000	USD
CY2013	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	122853000	USD
CY2013Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	41800000	USD
CY2013	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	134583000	USD
CY2011	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	46789000	USD
CY2012	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	92479000	USD
CY2011	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	3980000	USD
CY2012	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	9638000	USD
CY2013	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	11730000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Derivative Instruments DeferredTaxAssetsDerivativeInstruments	1664000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	17497000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	26939000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	-182229000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	-316812000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Liabilities Net Current DeferredTaxAssetsLiabilitiesNetCurrent	6335000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Liabilities Net Current DeferredTaxAssetsLiabilitiesNetCurrent	-4600000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Net Current DeferredTaxAssetsNetCurrent	6335000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Net Current DeferredTaxAssetsNetCurrent	0	USD
CY2012Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	13926000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	17215000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	8060000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	3571000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	1800000	USD
CY2013Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	343751000	USD
CY2012	us-gaap	Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves Future Cash Inflows DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesFutureCashInflows	11321992000	USD
CY2013Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	323147000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	199726000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Current DeferredTaxLiabilitiesCurrent	4558000	USD
CY2013Q4	us-gaap	Deferred Tax Liabilities Current DeferredTaxLiabilitiesCurrent	0	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Derivatives DeferredTaxLiabilitiesDerivatives	8455000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	177671000	USD
CY2013Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	343751000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	191271000	USD
CY2013	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	307055000	USD
CY2012	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	206734000	USD
CY2011	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	74981000	USD
CY2013Q4	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	2264000	USD
CY2012Q4	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	19016000	USD
CY2013Q4	us-gaap	Derivative Assets Noncurrent DerivativeAssetsNoncurrent	1333000	USD
CY2012Q4	us-gaap	Derivative Assets Noncurrent DerivativeAssetsNoncurrent	4981000	USD
CY2012Q4	us-gaap	Derivative Credit Risk Valuation Adjustment Derivative Liabilities DerivativeCreditRiskValuationAdjustmentDerivativeLiabilities	29000	USD
CY2013Q4	us-gaap	Derivative Credit Risk Valuation Adjustment Derivative Liabilities DerivativeCreditRiskValuationAdjustmentDerivativeLiabilities	200000	USD
CY2013Q4	us-gaap	Derivative Fair Value Of Derivative Net DerivativeFairValueOfDerivativeNet	-4730000	USD
CY2012	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	34164000	USD
CY2013	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	-35432000	USD
CY2011	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	1595000	USD
CY2013Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	8188000	USD
CY2012Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	1048000	USD
CY2013Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	139000	USD
CY2012Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	380000	USD
CY2013	us-gaap	Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves10 Percent Annual Discount For Estimated Timing Of Cash Flows DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves10PercentAnnualDiscountForEstimatedTimingOfCashFlows	4329102000	USD
CY2012	us-gaap	Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves10 Percent Annual Discount For Estimated Timing Of Cash Flows DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves10PercentAnnualDiscountForEstimatedTimingOfCashFlows	2693514000	USD
CY2011	us-gaap	Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves10 Percent Annual Discount For Estimated Timing Of Cash Flows DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves10PercentAnnualDiscountForEstimatedTimingOfCashFlows	1489988000	USD
CY2013	us-gaap	Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves Future Cash Inflows DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesFutureCashInflows	19063500000	USD
CY2011	us-gaap	Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves Future Cash Inflows DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesFutureCashInflows	6508604000	USD
CY2011	us-gaap	Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves Future Development Costs1 DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesFutureDevelopmentCosts1	-783486000	USD
CY2013	us-gaap	Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves Future Development Costs1 DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesFutureDevelopmentCosts1	-1904095000	USD
CY2012	us-gaap	Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves Future Development Costs1 DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesFutureDevelopmentCosts1	-1434648000	USD
CY2013	us-gaap	Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves Future Income Tax Expense1 DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesFutureIncomeTaxExpense1	-3628977000	USD
CY2011	us-gaap	Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves Future Income Tax Expense1 DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesFutureIncomeTaxExpense1	-1225395000	USD
CY2012	us-gaap	Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves Future Income Tax Expense1 DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesFutureIncomeTaxExpense1	-2123973000	USD
CY2013	us-gaap	Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves Future Net Cash Flows DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesFutureNetCashFlows	8056661000	USD
CY2011	us-gaap	Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves Future Net Cash Flows DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesFutureNetCashFlows	2809459000	USD
CY2012	us-gaap	Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves Future Net Cash Flows DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesFutureNetCashFlows	4953411000	USD
CY2011	us-gaap	Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves Future Production Costs1 DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesFutureProductionCosts1	-1690264000	USD
CY2013	us-gaap	Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves Future Production Costs1 DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesFutureProductionCosts1	-5473767000	USD
CY2012	us-gaap	Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves Future Production Costs1 DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesFutureProductionCosts1	-2809960000	USD
CY2012	us-gaap	Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves Standardized Measure DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesStandardizedMeasure	2259897000	USD
CY2013	us-gaap	Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves Standardized Measure DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesStandardizedMeasure	3727559000	USD
CY2011	us-gaap	Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves Standardized Measure DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesStandardizedMeasure	1319471000	USD
CY2012	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.66
CY2013	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.45
CY2011	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.86
CY2012	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.66
CY2013	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.44
CY2011	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.86
CY2013	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.3720
CY2012	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.3762
CY2011	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.3708
CY2011	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2012	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2013	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2013	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Other EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther	0.0014
CY2012	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Other EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther	0.0015
CY2011	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Other EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther	-0.0030
CY2011	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.0238
CY2012	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.0247
CY2013	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.0206
CY2012	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	4000000	USD
CY2013	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	4500000	USD
CY2012	us-gaap	Exploration Expense ExplorationExpense	3250000	USD
CY2013	us-gaap	Exploration Expense ExplorationExpense	2260000	USD
CY2011	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	1400000	USD
CY2013Q4	us-gaap	Energy Related Inventory Petroleum EnergyRelatedInventoryPetroleum	8983000	USD
CY2012Q4	us-gaap	Energy Related Inventory Petroleum EnergyRelatedInventoryPetroleum	4269000	USD
CY2011	us-gaap	Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Unrealized Gains Losses Included In Earnings Net FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnobservableInputUnrealizedGainsLossesIncludedInEarningsNet	5436000	USD
CY2011	us-gaap	Exploration Expense ExplorationExpense	1685000	USD
CY2013	us-gaap	Income Tax Reconciliation Nondeductible Expense Other IncomeTaxReconciliationNondeductibleExpenseOther	533000	USD
CY2011	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings1 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1	-1595000	USD
CY2011	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases Sales Issuances Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements	3841000	USD
CY2012	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Net FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet	5050000	USD
CY2010Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	-10486000	USD
CY2011Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	-5050000	USD
CY2013Q4	us-gaap	Financing Receivable Recorded Investment Past Due FinancingReceivableRecordedInvestmentPastDue	0	USD
CY2012	us-gaap	Gain Loss On Sale Of Property GainLossOnSaleOfProperty	0	USD
CY2013	us-gaap	Gain Loss On Sale Of Property GainLossOnSaleOfProperty	0	USD
CY2011	us-gaap	Gain Loss On Sale Of Property GainLossOnSaleOfProperty	-207000	USD
CY2012	us-gaap	Gas Gathering Transportation Marketing And Processing Costs GasGatheringTransportationMarketingAndProcessingCosts	9257000	USD
CY2011	us-gaap	Gas Gathering Transportation Marketing And Processing Costs GasGatheringTransportationMarketingAndProcessingCosts	1365000	USD
CY2013	us-gaap	Gas Gathering Transportation Marketing And Processing Costs GasGatheringTransportationMarketingAndProcessingCosts	25924000	USD
CY2011	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	29435000	USD
CY2012	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	57190000	USD
CY2013	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	75310000	USD
CY2011	us-gaap	Impairment Of Oil And Gas Properties ImpairmentOfOilAndGasProperties	3610000	USD
CY2012	us-gaap	Impairment Of Oil And Gas Properties ImpairmentOfOilAndGasProperties	3581000	USD
CY2013	us-gaap	Impairment Of Oil And Gas Properties ImpairmentOfOilAndGasProperties	1168000	USD
CY2012	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	245874000	USD
CY2013	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	363017000	USD
CY2011	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	126179000	USD
CY2011	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	46789000	USD
CY2012	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	92486000	USD
CY2013	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	135058000	USD
CY2012	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	86056000	USD
CY2013	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	127056000	USD
CY2011	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	44163000	USD
CY2011	us-gaap	Income Tax Reconciliation Nondeductible Expense Other IncomeTaxReconciliationNondeductibleExpenseOther	-378000	USD
CY2012	us-gaap	Income Tax Reconciliation Nondeductible Expense Other IncomeTaxReconciliationNondeductibleExpenseOther	362000	USD
CY2013	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	7469000	USD
CY2011	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	3004000	USD
CY2012	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	6068000	USD
CY2013	us-gaap	Income Taxes Paid IncomeTaxesPaid	750000	USD
CY2011	us-gaap	Income Taxes Paid IncomeTaxesPaid	0	USD
CY2012	us-gaap	Income Taxes Paid IncomeTaxesPaid	107000	USD
CY2012	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	76706000	USD
CY2013	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	107451000	USD
CY2011	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	36316000	USD
CY2013	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	107473000	USD
CY2011	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	64900000	USD
CY2012	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	90103000	USD
CY2012	us-gaap	Increase Decrease In Estimated Future Development Costs IncreaseDecreaseInEstimatedFutureDevelopmentCosts	28124000	USD
CY2013	us-gaap	Increase Decrease In Estimated Future Development Costs IncreaseDecreaseInEstimatedFutureDevelopmentCosts	57566000	USD
CY2011	us-gaap	Increase Decrease In Estimated Future Development Costs IncreaseDecreaseInEstimatedFutureDevelopmentCosts	-38244000	USD
CY2013	us-gaap	Increase Decrease In Future Income Tax Expense Estimates On Future Cash Flows Related To Proved Oil And Gas Reserves IncreaseDecreaseInFutureIncomeTaxExpenseEstimatesOnFutureCashFlowsRelatedToProvedOilAndGasReserves	-774910000	USD
CY2011	us-gaap	Increase Decrease In Future Income Tax Expense Estimates On Future Cash Flows Related To Proved Oil And Gas Reserves IncreaseDecreaseInFutureIncomeTaxExpenseEstimatesOnFutureCashFlowsRelatedToProvedOilAndGasReserves	-372146000	USD
CY2012	us-gaap	Increase Decrease In Future Income Tax Expense Estimates On Future Cash Flows Related To Proved Oil And Gas Reserves IncreaseDecreaseInFutureIncomeTaxExpenseEstimatesOnFutureCashFlowsRelatedToProvedOilAndGasReserves	-400196000	USD
CY2011	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	2550000	USD
CY2012	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	29313000	USD
CY2013	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	13941000	USD
CY2012	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	-156000	USD
CY2013	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	56000	USD
CY2011	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	491000	USD
CY2013	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	0	USD
CY2011	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	472000	USD
CY2012	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	-472000	USD
CY2012	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	95000	USD
CY2011	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	139000	USD
CY2013	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	3248000	USD
CY2013	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	887000	USD
CY2012	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	0	USD
CY2011	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	317000	USD
CY2011	us-gaap	Increase Decrease In Prepaid Expense IncreaseDecreaseInPrepaidExpense	1600000	USD
CY2013	us-gaap	Increase Decrease In Prepaid Expense IncreaseDecreaseInPrepaidExpense	8191000	USD
CY2012	us-gaap	Increase Decrease In Prepaid Expense IncreaseDecreaseInPrepaidExpense	-346000	USD
CY2011	us-gaap	Increase Due To Purchases Of Minerals In Place IncreaseDueToPurchasesOfMineralsInPlace	2679000	USD
CY2012	us-gaap	Increase Due To Purchases Of Minerals In Place IncreaseDueToPurchasesOfMineralsInPlace	15890000	USD
CY2013	us-gaap	Increase Due To Purchases Of Minerals In Place IncreaseDueToPurchasesOfMineralsInPlace	858382000	USD
CY2012	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	3300000	USD
CY2013	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	4600000	USD
CY2011	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	3100000	USD
CY2012	us-gaap	Interest Expense InterestExpense	70143000	USD
CY2011	us-gaap	Interest Expense InterestExpense	29618000	USD
CY2013	us-gaap	Interest Expense InterestExpense	107165000	USD
CY2012	us-gaap	Interest Paid Net InterestPaidNet	53488000	USD
CY2011	us-gaap	Interest Paid Net InterestPaidNet	13748000	USD
CY2013	us-gaap	Interest Paid Net InterestPaidNet	85596000	USD
CY2012Q4	us-gaap	Interest Payable Current InterestPayableCurrent	30096000	USD
CY2013Q4	us-gaap	Interest Payable Current InterestPayableCurrent	47910000	USD
CY2013Q4	us-gaap	Inventory Net InventoryNet	20652000	USD
CY2012Q4	us-gaap	Inventory Net InventoryNet	20707000	USD
CY2012	us-gaap	Lease Operating Expense LeaseOperatingExpense	54924000	USD
CY2011	us-gaap	Lease Operating Expense LeaseOperatingExpense	32707000	USD
CY2013	us-gaap	Lease Operating Expense LeaseOperatingExpense	94634000	USD
CY2013Q4	us-gaap	Liabilities Liabilities	3363375000	USD
CY2012Q4	us-gaap	Liabilities Liabilities	1733789000	USD
CY2012Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	2528794000	USD
CY2013Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	4711924000	USD
CY2013Q4	us-gaap	Liabilities Current LiabilitiesCurrent	466418000	USD
CY2012Q4	us-gaap	Liabilities Current LiabilitiesCurrent	330785000	USD
CY2013Q4	us-gaap	Liabilities Fair Value Disclosure LiabilitiesFairValueDisclosure	8327000	USD
CY2012Q4	us-gaap	Liabilities Fair Value Disclosure LiabilitiesFairValueDisclosure	1428000	USD
CY2013Q4	us-gaap	Liabilities Of Assets Held For Sale LiabilitiesOfAssetsHeldForSale	1973000	USD
CY2012Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	1200000000	USD
CY2013Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	2535570000	USD
CY2013	us-gaap	Long Term Purchase Commitment Amount LongTermPurchaseCommitmentAmount	5000000	USD
CY2013	us-gaap	Nature Of Operations NatureOfOperations	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-top:12px;text-indent:18px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">Nature of Business</font></div><div style="line-height:120%;padding-top:6px;text-indent:48px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The Company is an independent exploration and production company focused on the acquisition and development of unconventional oil and natural gas resources in the Williston Basin. The Company’s proved and unproved oil and natural gas properties are located in the North Dakota and Montana areas of the Williston Basin and are owned by OPNA. The Company also operates a marketing business (OPM), a well services business (OWS) and a midstream services business (OMS), all of which are complementary to its primary development and production activities. Both OWS and OMS are separate reportable business segments.</font></div></div>
CY2011	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	780718000	USD
CY2013	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	1625674000	USD
CY2012	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	388794000	USD
CY2012	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1038605000	USD
CY2011	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-629390000	USD
CY2013	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-2445076000	USD
CY2012	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	392386000	USD
CY2013	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	697856000	USD
CY2011	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	176024000	USD
CY2011	us-gaap	Net Income Loss NetIncomeLoss	79390000	USD
CY2013	us-gaap	Net Income Loss NetIncomeLoss	227959000	USD
CY2012	us-gaap	Net Income Loss NetIncomeLoss	153388000	USD
CY2012Q3	us-gaap	Net Income Loss NetIncomeLoss	18314000	USD
CY2012Q2	us-gaap	Net Income Loss NetIncomeLoss	76041000	USD
CY2012Q1	us-gaap	Net Income Loss NetIncomeLoss	16442000	USD
CY2013Q3	us-gaap	Net Income Loss NetIncomeLoss	54499000	USD
CY2013Q4	us-gaap	Net Income Loss NetIncomeLoss	54490000	USD
CY2012Q4	us-gaap	Net Income Loss NetIncomeLoss	42591000	USD
CY2013Q1	us-gaap	Net Income Loss NetIncomeLoss	51851000	USD
CY2013Q2	us-gaap	Net Income Loss NetIncomeLoss	67119000	USD
CY2013	us-gaap	Net Increase Decrease In Sales And Transfer Prices And Production Costs NetIncreaseDecreaseInSalesAndTransferPricesAndProductionCosts	254979000	USD
CY2011	us-gaap	Net Increase Decrease In Sales And Transfer Prices And Production Costs NetIncreaseDecreaseInSalesAndTransferPricesAndProductionCosts	299108000	USD
CY2012	us-gaap	Net Increase Decrease In Sales And Transfer Prices And Production Costs NetIncreaseDecreaseInSalesAndTransferPricesAndProductionCosts	-7814000	USD
CY2013	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-141381000	USD
CY2011	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-26388000	USD
CY2012	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-31119000	USD
CY2013	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	3	Segment
CY2012Q4	us-gaap	Oil And Gas Joint Interest Billing Receivables Current OilAndGasJointInterestBillingReceivablesCurrent	99194000	USD
CY2013Q4	us-gaap	Oil And Gas Joint Interest Billing Receivables Current OilAndGasJointInterestBillingReceivablesCurrent	139459000	USD
CY2012Q4	us-gaap	Oil And Gas Property Successful Effort Method Accumulated Depreciation Depletion And Amortization OilAndGasPropertySuccessfulEffortMethodAccumulatedDepreciationDepletionAndAmortization	383564000	USD
CY2013Q4	us-gaap	Oil And Gas Property Successful Effort Method Accumulated Depreciation Depletion And Amortization OilAndGasPropertySuccessfulEffortMethodAccumulatedDepreciationDepletionAndAmortization	612380000	USD
CY2013Q4	us-gaap	Oil And Gas Property Successful Effort Method Gross OilAndGasPropertySuccessfulEffortMethodGross	4528958000	USD
CY2012Q4	us-gaap	Oil And Gas Property Successful Effort Method Gross OilAndGasPropertySuccessfulEffortMethodGross	2348128000	USD
CY2012	us-gaap	Oil And Gas Revenue OilAndGasRevenue	686668000	USD
CY2013	us-gaap	Oil And Gas Revenue OilAndGasRevenue	1141999000	USD
CY2011	us-gaap	Oil And Gas Revenue OilAndGasRevenue	330422000	USD
CY2013Q4	us-gaap	Oil And Gas Revenue OilAndGasRevenue	333615000	USD
CY2013Q3	us-gaap	Oil And Gas Revenue OilAndGasRevenue	305498000	USD
CY2013Q2	us-gaap	Oil And Gas Revenue OilAndGasRevenue	254582000	USD
CY2012Q1	us-gaap	Oil And Gas Revenue OilAndGasRevenue	138566000	USD
CY2012Q2	us-gaap	Oil And Gas Revenue OilAndGasRevenue	149063000	USD
CY2012Q4	us-gaap	Oil And Gas Revenue OilAndGasRevenue	214327000	USD
CY2012Q3	us-gaap	Oil And Gas Revenue OilAndGasRevenue	184710000	USD
CY2013Q1	us-gaap	Oil And Gas Revenue OilAndGasRevenue	248304000	USD
CY2012	us-gaap	Oil And Gas Sales Revenue OilAndGasSalesRevenue	670491000	USD
CY2011	us-gaap	Oil And Gas Sales Revenue OilAndGasSalesRevenue	330422000	USD
CY2013	us-gaap	Oil And Gas Sales Revenue OilAndGasSalesRevenue	1084412000	USD
CY2012	us-gaap	Operating Income Loss OperatingIncomeLoss	276993000	USD
CY2011	us-gaap	Operating Income Loss OperatingIncomeLoss	152567000	USD
CY2013	us-gaap	Operating Income Loss OperatingIncomeLoss	504398000	USD
CY2012Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	60184000	USD
CY2013Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	117953000	USD
CY2013Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	113450000	USD
CY2012Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	86619000	USD
CY2012Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	72038000	USD
CY2012Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	58152000	USD
CY2013Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	122133000	USD
CY2013Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	150862000	USD
CY2013Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	11111000	USD
CY2013Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	2927000	USD
CY2013Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	0	USD
CY2013Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	2235000	USD
CY2013Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	2992000	USD
CY2013Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	2957000	USD
CY2013Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	0	USD
CY2011	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	800000	USD
CY2013	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	1600000	USD
CY2012	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	1500000	USD
CY2013Q4	us-gaap	Operating Loss Carryforwards OperatingLossCarryforwards	14700000	USD
CY2012Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	5128000	USD
CY2013Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	9882000	USD
CY2012Q4	us-gaap	Other Assets Current OtherAssetsCurrent	335000	USD
CY2013Q4	us-gaap	Other Assets Current OtherAssetsCurrent	391000	USD
CY2012Q4	us-gaap	Other Inventory Supplies OtherInventorySupplies	16438000	USD
CY2013Q4	us-gaap	Other Inventory Supplies OtherInventorySupplies	11669000	USD
CY2013Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	2183000	USD
CY2013Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	4079750000	USD
CY2012Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	2006600000	USD
CY2012Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	49732000	USD
CY2012	us-gaap	Proceeds From Issuance Of Senior Long Term Debt ProceedsFromIssuanceOfSeniorLongTermDebt	400000000	USD
CY2012Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	1997000	USD
CY2011	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	1635000	USD
CY2012	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	4860000	USD
CY2013	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	1216000	USD
CY2011	us-gaap	Payments For Proceeds From Derivative Instrument Investing Activities PaymentsForProceedsFromDerivativeInstrumentInvestingActivities	3841000	USD
CY2013	us-gaap	Payments For Proceeds From Derivative Instrument Investing Activities PaymentsForProceedsFromDerivativeInstrumentInvestingActivities	8133000	USD
CY2012	us-gaap	Payments For Proceeds From Derivative Instrument Investing Activities PaymentsForProceedsFromDerivativeInstrumentInvestingActivities	-6545000	USD
CY2013	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	22910000	USD
CY2012	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	8012000	USD
CY2011	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	18680000	USD
CY2013	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	1566000	USD
CY2012	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	3194000	USD
CY2011	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	602000	USD
CY2012	us-gaap	Payments To Acquire Oil And Gas Property PaymentsToAcquireOilAndGasProperty	0	USD
CY2013	us-gaap	Payments To Acquire Oil And Gas Property PaymentsToAcquireOilAndGasProperty	1560072000	USD
CY2011	us-gaap	Payments To Acquire Oil And Gas Property PaymentsToAcquireOilAndGasProperty	0	USD
CY2012	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	126213000	USD
CY2013	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	0	USD
CY2011	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	184907000	USD
CY2012	us-gaap	Payments To Explore And Develop Oil And Gas Properties PaymentsToExploreAndDevelopOilAndGasProperties	1051365000	USD
CY2013	us-gaap	Payments To Explore And Develop Oil And Gas Properties PaymentsToExploreAndDevelopOilAndGasProperties	893524000	USD
CY2011	us-gaap	Payments To Explore And Develop Oil And Gas Properties PaymentsToExploreAndDevelopOilAndGasProperties	613720000	USD
CY2013Q4	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	10191000	USD
CY2012Q4	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	1770000	USD
CY2011	us-gaap	Previously Estimated Development Costs Incurred During Period PreviouslyEstimatedDevelopmentCostsIncurredDuringPeriod	146847000	USD
CY2012	us-gaap	Previously Estimated Development Costs Incurred During Period PreviouslyEstimatedDevelopmentCostsIncurredDuringPeriod	480925000	USD
CY2013	us-gaap	Previously Estimated Development Costs Incurred During Period PreviouslyEstimatedDevelopmentCostsIncurredDuringPeriod	373912000	USD
CY2012	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	USD
CY2013	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	314580000	USD
CY2011	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	USD
CY2013	us-gaap	Proceeds From Issuance Of Senior Long Term Debt ProceedsFromIssuanceOfSeniorLongTermDebt	1000000000	USD
CY2011	us-gaap	Proceeds From Issuance Of Senior Long Term Debt ProceedsFromIssuanceOfSeniorLongTermDebt	800000000	USD
CY2012	us-gaap	Proceeds From Long Term Lines Of Credit ProceedsFromLongTermLinesOfCredit	0	USD
CY2013	us-gaap	Proceeds From Long Term Lines Of Credit ProceedsFromLongTermLinesOfCredit	600000000	USD
CY2011	us-gaap	Proceeds From Long Term Lines Of Credit ProceedsFromLongTermLinesOfCredit	0	USD
CY2011	us-gaap	Proceeds From Sale Maturity And Collection Of Shortterm Investments ProceedsFromSaleMaturityAndCollectionOfShorttermInvestments	164913000	USD
CY2013	us-gaap	Proceeds From Sale Maturity And Collection Of Shortterm Investments ProceedsFromSaleMaturityAndCollectionOfShorttermInvestments	25000000	USD
CY2012	us-gaap	Proceeds From Sale Maturity And Collection Of Shortterm Investments ProceedsFromSaleMaturityAndCollectionOfShorttermInvestments	120316000	USD
CY2013	us-gaap	Proceeds From Sale Of Oil And Gas Property And Equipment ProceedsFromSaleOfOilAndGasPropertyAndEquipment	0	USD
CY2011	us-gaap	Proceeds From Sale Of Oil And Gas Property And Equipment ProceedsFromSaleOfOilAndGasPropertyAndEquipment	2202000	USD
CY2012	us-gaap	Proceeds From Sale Of Oil And Gas Property And Equipment ProceedsFromSaleOfOilAndGasPropertyAndEquipment	0	USD
CY2011	us-gaap	Production Tax Expense ProductionTaxExpense	33865000	USD
CY2013	us-gaap	Production Tax Expense ProductionTaxExpense	100537000	USD
CY2012	us-gaap	Production Tax Expense ProductionTaxExpense	62965000	USD
CY2011	us-gaap	Proved Developed And Undeveloped Reserves Production ProvedDevelopedAndUndevelopedReservesProduction	3732	MBbls
CY2013	us-gaap	Proved Developed And Undeveloped Reserves Production ProvedDevelopedAndUndevelopedReservesProduction	11133	MBbls
CY2013Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	188468000	USD
CY2013Q4	us-gaap	Property Plant And Equipment Other Accumulated Depreciation PropertyPlantAndEquipmentOtherAccumulatedDepreciation	25296000	USD
CY2012Q4	us-gaap	Property Plant And Equipment Other Accumulated Depreciation PropertyPlantAndEquipmentOtherAccumulatedDepreciation	7696000	USD
CY2012Q4	us-gaap	Property Plant And Equipment Other Net PropertyPlantAndEquipmentOtherNet	42036000	USD
CY2013Q4	us-gaap	Property Plant And Equipment Other Net PropertyPlantAndEquipmentOtherNet	163172000	USD
CY2011	us-gaap	Proved Developed And Undeveloped Reserves Extensions Discoveries And Additions ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions	40220	MMcf
CY2013	us-gaap	Proved Developed And Undeveloped Reserves Extensions Discoveries And Additions ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions	40784	MBbls
CY2011	us-gaap	Proved Developed And Undeveloped Reserves Extensions Discoveries And Additions ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions	36464	MBbls
CY2012	us-gaap	Proved Developed And Undeveloped Reserves Extensions Discoveries And Additions ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions	66245	MBbls
CY2013	us-gaap	Proved Developed And Undeveloped Reserves Extensions Discoveries And Additions ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions	31856	MMcf
CY2012	us-gaap	Proved Developed And Undeveloped Reserves Extensions Discoveries And Additions ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions	45759	MMcf
CY2011Q4	us-gaap	Proved Developed And Undeveloped Reserves Net ProvedDevelopedAndUndevelopedReservesNet	57900	MMcf
CY2011Q4	us-gaap	Proved Developed And Undeveloped Reserves Net ProvedDevelopedAndUndevelopedReservesNet	69064	MBbls
CY2012Q4	us-gaap	Proved Developed And Undeveloped Reserves Net ProvedDevelopedAndUndevelopedReservesNet	91530	MMcf
CY2010Q4	us-gaap	Proved Developed And Undeveloped Reserves Net ProvedDevelopedAndUndevelopedReservesNet	36550	MBbls
CY2012Q4	us-gaap	Proved Developed And Undeveloped Reserves Net ProvedDevelopedAndUndevelopedReservesNet	128090	MBbls
CY2013Q4	us-gaap	Proved Developed And Undeveloped Reserves Net ProvedDevelopedAndUndevelopedReservesNet	198590	MBbls
CY2010Q4	us-gaap	Proved Developed And Undeveloped Reserves Net ProvedDevelopedAndUndevelopedReservesNet	19379	MMcf
CY2013Q4	us-gaap	Proved Developed And Undeveloped Reserves Net ProvedDevelopedAndUndevelopedReservesNet	175979	MMcf
CY2013	us-gaap	Proved Developed And Undeveloped Reserves Production ProvedDevelopedAndUndevelopedReservesProduction	7450	MMcf
CY2011	us-gaap	Proved Developed And Undeveloped Reserves Production ProvedDevelopedAndUndevelopedReservesProduction	1087	MMcf
CY2012	us-gaap	Proved Developed And Undeveloped Reserves Production ProvedDevelopedAndUndevelopedReservesProduction	4146	MMcf
CY2012	us-gaap	Proved Developed And Undeveloped Reserves Production ProvedDevelopedAndUndevelopedReservesProduction	7533	MBbls
CY2011	us-gaap	Proved Developed And Undeveloped Reserves Purchases Of Minerals In Place ProvedDevelopedAndUndevelopedReservesPurchasesOfMineralsInPlace	100	MBbls
CY2012	us-gaap	Proved Developed And Undeveloped Reserves Purchases Of Minerals In Place ProvedDevelopedAndUndevelopedReservesPurchasesOfMineralsInPlace	512	MMcf
CY2013	us-gaap	Proved Developed And Undeveloped Reserves Purchases Of Minerals In Place ProvedDevelopedAndUndevelopedReservesPurchasesOfMineralsInPlace	49631	MMcf
CY2012	us-gaap	Proved Developed And Undeveloped Reserves Purchases Of Minerals In Place ProvedDevelopedAndUndevelopedReservesPurchasesOfMineralsInPlace	881	MBbls
CY2013	us-gaap	Proved Developed And Undeveloped Reserves Purchases Of Minerals In Place ProvedDevelopedAndUndevelopedReservesPurchasesOfMineralsInPlace	37459	MBbls
CY2011	us-gaap	Proved Developed And Undeveloped Reserves Purchases Of Minerals In Place ProvedDevelopedAndUndevelopedReservesPurchasesOfMineralsInPlace	65	MMcf
CY2012	us-gaap	Proved Developed And Undeveloped Reserves Revisions Of Previous Estimates Increase Decrease ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease	567	MBbls
CY2013	us-gaap	Proved Developed And Undeveloped Reserves Revisions Of Previous Estimates Increase Decrease ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease	3390	MBbls
CY2011	us-gaap	Proved Developed And Undeveloped Reserves Revisions Of Previous Estimates Increase Decrease ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease	159	MMcf
CY2011	us-gaap	Proved Developed And Undeveloped Reserves Revisions Of Previous Estimates Increase Decrease ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease	262	MBbls
CY2013	us-gaap	Proved Developed And Undeveloped Reserves Revisions Of Previous Estimates Increase Decrease ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease	10411	MMcf
CY2012	us-gaap	Proved Developed And Undeveloped Reserves Revisions Of Previous Estimates Increase Decrease ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease	8495	MMcf
CY2012	us-gaap	Proved Developed And Undeveloped Reserves Sales Of Minerals In Place ProvedDevelopedAndUndevelopedReservesSalesOfMineralsInPlace	0	MBbls
CY2012	us-gaap	Proved Developed And Undeveloped Reserves Sales Of Minerals In Place ProvedDevelopedAndUndevelopedReservesSalesOfMineralsInPlace	0	MMcf
CY2011	us-gaap	Proved Developed And Undeveloped Reserves Sales Of Minerals In Place ProvedDevelopedAndUndevelopedReservesSalesOfMineralsInPlace	518	MMcf
CY2011	us-gaap	Proved Developed And Undeveloped Reserves Sales Of Minerals In Place ProvedDevelopedAndUndevelopedReservesSalesOfMineralsInPlace	56	MBbls
CY2012Q4	us-gaap	Proved Developed Reserves Boe1 ProvedDevelopedReservesBOE1	70051	MBoe
CY2011Q4	us-gaap	Proved Developed Reserves Boe1 ProvedDevelopedReservesBOE1	35839	MBoe
CY2013Q4	us-gaap	Proved Developed Reserves Boe1 ProvedDevelopedReservesBOE1	122136	MBoe
CY2013	us-gaap	Repayments Of Long Term Lines Of Credit RepaymentsOfLongTermLinesOfCredit	264430000	USD
CY2012	us-gaap	Repayments Of Long Term Lines Of Credit RepaymentsOfLongTermLinesOfCredit	0	USD
CY2011	us-gaap	Results Of Operations Depreciation Depletion And Amortization And Valuation Provisions ResultsOfOperationsDepreciationDepletionAndAmortizationAndValuationProvisions	74101000	USD
CY2013	us-gaap	Results Of Operations Depreciation Depletion And Amortization And Valuation Provisions ResultsOfOperationsDepreciationDepletionAndAmortizationAndValuationProvisions	298999000	USD
CY2011	us-gaap	Repayments Of Long Term Lines Of Credit RepaymentsOfLongTermLinesOfCredit	0	USD
CY2012Q4	us-gaap	Proved Developed Reserves Volume ProvedDevelopedReservesVolume	62602	MBbls
CY2011Q4	us-gaap	Proved Developed Reserves Volume ProvedDevelopedReservesVolume	31749	MBbls
CY2013Q4	us-gaap	Proved Developed Reserves Volume ProvedDevelopedReservesVolume	92170	MMcf
CY2013Q4	us-gaap	Proved Developed Reserves Volume ProvedDevelopedReservesVolume	106774	MBbls
CY2012Q4	us-gaap	Proved Developed Reserves Volume ProvedDevelopedReservesVolume	44695	MMcf
CY2011Q4	us-gaap	Proved Developed Reserves Volume ProvedDevelopedReservesVolume	24535	MMcf
CY2012Q4	us-gaap	Proved Oil And Gas Property Successful Effort Method ProvedOilAndGasPropertySuccessfulEffortMethod	2271711000	USD
CY2013Q4	us-gaap	Proved Oil And Gas Property Successful Effort Method ProvedOilAndGasPropertySuccessfulEffortMethod	3713525000	USD
CY2012Q4	us-gaap	Proved Undeveloped Reserve Boe1 ProvedUndevelopedReserveBOE1	73294	MBoe
CY2011Q4	us-gaap	Proved Undeveloped Reserve Boe1 ProvedUndevelopedReserveBOE1	42876	MBoe
CY2013Q4	us-gaap	Proved Undeveloped Reserve Boe1 ProvedUndevelopedReserveBOE1	105784	MBoe
CY2011Q4	us-gaap	Proved Undeveloped Reserve Volume ProvedUndevelopedReserveVolume	33365	MMcf
CY2013Q4	us-gaap	Proved Undeveloped Reserve Volume ProvedUndevelopedReserveVolume	91816	MBbls
CY2013Q4	us-gaap	Proved Undeveloped Reserve Volume ProvedUndevelopedReserveVolume	83809	MMcf
CY2011Q4	us-gaap	Proved Undeveloped Reserve Volume ProvedUndevelopedReserveVolume	37315	MBbls
CY2012Q4	us-gaap	Proved Undeveloped Reserve Volume ProvedUndevelopedReserveVolume	46835	MMcf
CY2012Q4	us-gaap	Proved Undeveloped Reserve Volume ProvedUndevelopedReserveVolume	65488	MBbls
CY2012	us-gaap	Reclassification To Well Facilities And Equipment Based On Determination Of Proved Reserves ReclassificationToWellFacilitiesAndEquipmentBasedOnDeterminationOfProvedReserves	140091000	USD
CY2011	us-gaap	Reclassification To Well Facilities And Equipment Based On Determination Of Proved Reserves ReclassificationToWellFacilitiesAndEquipmentBasedOnDeterminationOfProvedReserves	57646000	USD
CY2013	us-gaap	Reclassification To Well Facilities And Equipment Based On Determination Of Proved Reserves ReclassificationToWellFacilitiesAndEquipmentBasedOnDeterminationOfProvedReserves	264023000	USD
CY2012	us-gaap	Results Of Operations Depreciation Depletion And Amortization And Valuation Provisions ResultsOfOperationsDepreciationDepletionAndAmortizationAndValuationProvisions	202398000	USD
CY2012	us-gaap	Results Of Operations Dry Hole Costs ResultsOfOperationsDryHoleCosts	505000	USD
CY2011	us-gaap	Results Of Operations Dry Hole Costs ResultsOfOperationsDryHoleCosts	1270000	USD
CY2011	us-gaap	Results Of Operations Exploration Expense ResultsOfOperationsExplorationExpense	1685000	USD
CY2013	us-gaap	Results Of Operations Exploration Expense ResultsOfOperationsExplorationExpense	2260000	USD
CY2012	us-gaap	Results Of Operations Exploration Expense ResultsOfOperationsExplorationExpense	3250000	USD
CY2013	us-gaap	Results Of Operations Impairment Of Oil And Gas Properties ResultsOfOperationsImpairmentOfOilAndGasProperties	1168000	USD
CY2012	us-gaap	Results Of Operations Impairment Of Oil And Gas Properties ResultsOfOperationsImpairmentOfOilAndGasProperties	3581000	USD
CY2011	us-gaap	Results Of Operations Impairment Of Oil And Gas Properties ResultsOfOperationsImpairmentOfOilAndGasProperties	3610000	USD
CY2011	us-gaap	Results Of Operations Income Tax Expense ResultsOfOperationsIncomeTaxExpense	64009000	USD
CY2012	us-gaap	Results Of Operations Income Tax Expense ResultsOfOperationsIncomeTaxExpense	116941000	USD
CY2013	us-gaap	Results Of Operations Income Tax Expense ResultsOfOperationsIncomeTaxExpense	196312000	USD
CY2012	us-gaap	Results Of Operations Oil And Gas Producing Activities Net Income Excluding Corporate Overhead And Interest Costs ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts	217175000	USD
CY2013	us-gaap	Results Of Operations Oil And Gas Producing Activities Net Income Excluding Corporate Overhead And Interest Costs ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts	364578000	USD
CY2011	us-gaap	Results Of Operations Oil And Gas Producing Activities Net Income Excluding Corporate Overhead And Interest Costs ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts	118873000	USD
CY2012	us-gaap	Results Of Operations Production Or Lifting Costs ResultsOfOperationsProductionOrLiftingCosts	127146000	USD
CY2011	us-gaap	Results Of Operations Production Or Lifting Costs ResultsOfOperationsProductionOrLiftingCosts	67937000	USD
CY2013	us-gaap	Results Of Operations Production Or Lifting Costs ResultsOfOperationsProductionOrLiftingCosts	221095000	USD
CY2011	us-gaap	Results Of Operations Revenue From Oil And Gas Producing Activities ResultsOfOperationsRevenueFromOilAndGasProducingActivities	330422000	USD
CY2013	us-gaap	Results Of Operations Revenue From Oil And Gas Producing Activities ResultsOfOperationsRevenueFromOilAndGasProducingActivities	1084412000	USD
CY2012	us-gaap	Results Of Operations Revenue From Oil And Gas Producing Activities ResultsOfOperationsRevenueFromOilAndGasProducingActivities	670491000	USD
CY2012Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	139933000	USD
CY2013Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	367892000	USD
CY2012	us-gaap	Revenue Oil And Gas Services RevenueOilAndGasServices	16177000	USD
CY2011	us-gaap	Revenue Oil And Gas Services RevenueOilAndGasServices	0	USD
CY2013	us-gaap	Revenue Oil And Gas Services RevenueOilAndGasServices	57587000	USD
CY2013	us-gaap	Revisions Of Previous Quantity Estimates RevisionsOfPreviousQuantityEstimates	99954000	USD
CY2012	us-gaap	Revisions Of Previous Quantity Estimates RevisionsOfPreviousQuantityEstimates	-47957000	USD
CY2011	us-gaap	Revisions Of Previous Quantity Estimates RevisionsOfPreviousQuantityEstimates	-5058000	USD
CY2012	us-gaap	Sales And Transfers Of Oil And Gas Produced Net Of Production Costs SalesAndTransfersOfOilAndGasProducedNetOfProductionCosts	542515000	USD
CY2011	us-gaap	Sales And Transfers Of Oil And Gas Produced Net Of Production Costs SalesAndTransfersOfOilAndGasProducedNetOfProductionCosts	262485000	USD
CY2013	us-gaap	Sales And Transfers Of Oil And Gas Produced Net Of Production Costs SalesAndTransfersOfOilAndGasProducedNetOfProductionCosts	857540000	USD
CY2013	us-gaap	Segment Reporting Disclosure Of Major Customers SegmentReportingDisclosureOfMajorCustomers	No other
CY2012	us-gaap	Share Based Compensation ShareBasedCompensation	10333000	USD
CY2011	us-gaap	Share Based Compensation ShareBasedCompensation	3656000	USD
CY2013	us-gaap	Share Based Compensation ShareBasedCompensation	11982000	USD
CY2013	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Period1 ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1	P3Y
CY2013Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	7200000	shares
CY2013Q4	us-gaap	Shares Issued Price Per Share SharesIssuedPricePerShare	44.94
CY2013Q4	us-gaap	Short Term Investments ShortTermInvestments	0	USD
CY2012Q4	us-gaap	Short Term Investments ShortTermInvestments	25891000	USD
CY2011	us-gaap	Standardized Measure Of Discounted Future Net Cash Flow Of Proved Oil And Gas Reserves Other StandardizedMeasureOfDiscountedFutureNetCashFlowOfProvedOilAndGasReservesOther	6055000	USD
CY2013	us-gaap	Standardized Measure Of Discounted Future Net Cash Flow Of Proved Oil And Gas Reserves Other StandardizedMeasureOfDiscountedFutureNetCashFlowOfProvedOilAndGasReservesOther	-1951000	USD
CY2012	us-gaap	Standardized Measure Of Discounted Future Net Cash Flow Of Proved Oil And Gas Reserves Other StandardizedMeasureOfDiscountedFutureNetCashFlowOfProvedOilAndGasReservesOther	-134880000	USD
CY2013Q4	us-gaap	Standardized Measure Of Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves	3727559000	USD
CY2011Q4	us-gaap	Standardized Measure Of Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves	1319471000	USD
CY2012Q4	us-gaap	Standardized Measure Of Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves	2259897000	USD
CY2010Q4	us-gaap	Standardized Measure Of Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves	485735000	USD
CY2013	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	314580000	USD
CY2012	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	10573000	USD
CY2011	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	3656000	USD
CY2013	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	12571000	USD
CY2013Q4	us-gaap	Stockholders Equity StockholdersEquity	1348549000	USD
CY2012Q4	us-gaap	Stockholders Equity StockholdersEquity	795005000	USD
CY2011Q4	us-gaap	Stockholders Equity StockholdersEquity	634238000	USD
CY2010Q4	us-gaap	Stockholders Equity StockholdersEquity	551794000	USD
CY2012Q4	us-gaap	Unproved Oil And Gas Property Successful Effort Method UnprovedOilAndGasPropertySuccessfulEffortMethod	76417000	USD
CY2013Q4	us-gaap	Unproved Oil And Gas Property Successful Effort Method UnprovedOilAndGasPropertySuccessfulEffortMethod	815433000	USD
CY2012	us-gaap	Unrealized Gain Loss On Commodity Contracts UnrealizedGainLossOnCommodityContracts	27619000	USD
CY2011	us-gaap	Unrealized Gain Loss On Commodity Contracts UnrealizedGainLossOnCommodityContracts	5436000	USD
CY2013	us-gaap	Unrealized Gain Loss On Commodity Contracts UnrealizedGainLossOnCommodityContracts	-27299000	USD
CY2013Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	0	USD
CY2013	us-gaap	Use Of Estimates UseOfEstimates	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-top:18px;text-indent:16px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">Use of Estimates</font></div><div style="line-height:120%;padding-top:6px;text-indent:65px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Preparation of the Company’s consolidated financial statements in accordance with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. The most significant estimates pertain to proved oil and natural gas reserves and related cash flow estimates used in impairment tests of long-lived assets, estimates of future development, dismantlement and abandonment costs, estimates relating to certain oil and natural gas revenues and expenses and estimates of expenses related to legal, environmental and other contingencies. Certain of these estimates require assumptions regarding future commodity prices, future costs and expenses and future production rates. Actual results could differ from those estimates.</font></div><div style="line-height:120%;padding-top:12px;text-indent:65px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">As an oil and natural gas producer, the Company’s revenue, profitability and future growth are substantially dependent upon the prevailing and future prices for oil and natural gas, which are dependent upon numerous factors beyond its control such as economic, political and regulatory developments and competition from other energy sources. The energy markets have historically been very volatile and there can be no assurance that oil and natural gas prices will not be subject to wide fluctuations in the future. A substantial or extended decline in oil and natural gas prices could have a material adverse effect on the Company’s financial position, results of operations, cash flows and quantities of oil and natural gas reserves that may be economically produced.</font></div><div style="line-height:120%;padding-top:12px;text-indent:65px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Estimates of oil and natural gas reserves and their values, future production rates and future costs and expenses are inherently uncertain for numerous reasons, including many factors beyond the Company’s control. Reservoir engineering is a subjective process of estimating underground accumulations of oil and natural gas that cannot be measured in an exact manner. The accuracy of any reserve estimate is a function of the quality of data available and of engineering and geological interpretation and judgment. In addition, estimates of reserves may be revised based on actual production, results of subsequent exploration and development activities, prevailing commodity prices, operating costs and other factors. These revisions may be material and could materially affect future depletion, depreciation and amortization expense, dismantlement and abandonment costs, and impairment expense.</font></div></div>
CY2013	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	544000	shares
CY2011	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	185000	shares
CY2012	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	333000	shares
CY2011	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	92241000	shares
CY2012	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	92513000	shares
CY2013	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	93411000	shares
CY2013	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	92867000	shares
CY2011	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	92056000	shares
CY2012	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	92180000	shares
CY2013	us-gaap	Well Service Expense WellServiceExpense	30713000	USD
CY2012	us-gaap	Well Service Expense WellServiceExpense	11774000	USD
CY2012Q4	oas	Accrued Capital Costs AccruedCapitalCosts	167246000	USD
CY2012Q4	oas	Accrued General And Administrative Expense AccruedGeneralAndAdministrativeExpense	7703000	USD
CY2013Q4	oas	Accrued General And Administrative Expense AccruedGeneralAndAdministrativeExpense	14203000	USD
CY2011	us-gaap	Well Service Expense WellServiceExpense	0	USD
CY2013Q4	oas	Accrued Capital Costs AccruedCapitalCosts	199085000	USD
CY2013	oas	Discount Rate Of Future Cash Flows DiscountRateOfFutureCashFlows	0.1
CY2013Q4	oas	Accrued Lease Operating Expense AccruedLeaseOperatingExpense	18660000	USD
CY2012Q4	oas	Accrued Lease Operating Expense AccruedLeaseOperatingExpense	9786000	USD
CY2011	oas	Additional Proved Undeveloped Reserves AdditionalProvedUndevelopedReserves	30472	MBoe
CY2013	oas	Additional Proved Undeveloped Reserves AdditionalProvedUndevelopedReserves	23904	MBoe
CY2012	oas	Additional Proved Undeveloped Reserves AdditionalProvedUndevelopedReserves	57323	MBoe
CY2012Q4	oas	Advances From Joint Interest Partners Current AdvancesFromJointInterestPartnersCurrent	21176000	USD
CY2013Q4	oas	Advances From Joint Interest Partners Current AdvancesFromJointInterestPartnersCurrent	12829000	USD
CY2012Q4	oas	Advances To Joint Interest Partners Current AdvancesToJointInterestPartnersCurrent	1985000	USD
CY2013Q4	oas	Advances To Joint Interest Partners Current AdvancesToJointInterestPartnersCurrent	760000	USD
CY2013Q4	oas	Assets Heldfor Sale Accumulated Depreciation Depletion Amortizationand Impairment AssetsHeldforSaleAccumulatedDepreciationDepletionAmortizationandImpairment	54318000	USD
CY2013Q4	oas	Assets Heldfor Sale Long Lived Netof Liabilities AssetsHeldforSaleLongLivedNetofLiabilities	135093000	USD
CY2013Q4	oas	Assets Heldfor Sale Oiland Gas Properties AssetsHeldforSaleOilandGasProperties	191384000	USD
CY2013	oas	Cost Sharing Commitments Amount CostSharingCommitmentsAmount	12700000	USD
CY2011	oas	Debt Discount Amortization And Other DebtDiscountAmortizationAndOther	1561000	USD
CY2013	oas	Debt Discount Amortization And Other DebtDiscountAmortizationAndOther	4248000	USD
CY2012	oas	Debt Discount Amortization And Other DebtDiscountAmortizationAndOther	2810000	USD
CY2013Q4	oas	Derivative Numberof Counterparties DerivativeNumberofCounterparties	6	counterparty
CY2013	oas	Estimated Extensions And Discoveries Of Reserves Associated With New Wells EstimatedExtensionsAndDiscoveriesOfReservesAssociatedWithNewWells	22190	MBoe
CY2011	oas	Estimated Extensions And Discoveries Of Reserves Associated With New Wells EstimatedExtensionsAndDiscoveriesOfReservesAssociatedWithNewWells	12696	MBoe
CY2012	oas	Estimated Extensions And Discoveries Of Reserves Associated With New Wells EstimatedExtensionsAndDiscoveriesOfReservesAssociatedWithNewWells	16548	MBoe
CY2013Q4	oas	Investment Commitment InvestmentCommitment	7000000	USD
CY2013	oas	Proved Developedand Undeveloped Reserves Extensions Discoveriesand Additions Energy ProvedDevelopedandUndevelopedReservesExtensionsDiscoveriesandAdditionsEnergy	46094	MBoe
CY2012Q4	oas	Proved Developedand Undeveloped Reserves Net Energy ProvedDevelopedandUndevelopedReservesNetEnergy	143345	MBoe
CY2013Q4	oas	Liabilitiesof Assets Heldfor Sale Asset Retirement Obligation LiabilitiesofAssetsHeldforSaleAssetRetirementObligation	1973000	USD
CY2013	oas	Non Cash Asset Retirement Obligations NonCashAssetRetirementObligations	13201000	USD
CY2011	oas	Non Cash Asset Retirement Obligations NonCashAssetRetirementObligations	5434000	USD
CY2012	oas	Non Cash Asset Retirement Obligations NonCashAssetRetirementObligations	10230000	USD
CY2013	oas	Ownership Percentage Guarantor OwnershipPercentageGuarantor	1
CY2012	oas	Percentage Of Proved Undeveloped Reserves PercentageOfProvedUndevelopedReserves	1
CY2013	oas	Percentage Of Proved Undeveloped Reserves PercentageOfProvedUndevelopedReserves	1
CY2011	oas	Percentage Of Proved Undeveloped Reserves PercentageOfProvedUndevelopedReserves	1
CY2013	oas	Percentage Of Reserves Produced From Wells PercentageOfReservesProducedFromWells	1
CY2011	oas	Percentage Of Reserves Produced From Wells PercentageOfReservesProducedFromWells	1
CY2012	oas	Percentage Of Reserves Produced From Wells PercentageOfReservesProducedFromWells	1
CY2013Q4	oas	Portion Of Future Oil And Gas Production Percentage PortionOfFutureOilAndGasProductionPercentage	1.10
CY2013	oas	Proceed From Advance From Joint Interest Partners ProceedFromAdvanceFromJointInterestPartners	-8347000	USD
CY2011	oas	Proceed From Advance From Joint Interest Partners ProceedFromAdvanceFromJointInterestPartners	5963000	USD
CY2012	oas	Proceed From Advance From Joint Interest Partners ProceedFromAdvanceFromJointInterestPartners	12112000	USD
CY2013	oas	Proceedsfrom Issuanceof Common Stock Netof Discountsand Expenses ProceedsfromIssuanceofCommonStockNetofDiscountsandExpenses	314400000	USD
CY2013Q4	oas	Production Taxes Payable ProductionTaxesPayable	22300000	USD
CY2012Q4	oas	Production Taxes Payable ProductionTaxesPayable	11600000	USD
CY2012	oas	Proved Developedand Undeveloped Reserves Extensions Discoveriesand Additions Energy ProvedDevelopedandUndevelopedReservesExtensionsDiscoveriesandAdditionsEnergy	73871	MBoe
CY2011	oas	Proved Developedand Undeveloped Reserves Extensions Discoveriesand Additions Energy ProvedDevelopedandUndevelopedReservesExtensionsDiscoveriesandAdditionsEnergy	43168	MBoe
CY2013Q4	oas	Proved Developedand Undeveloped Reserves Net Energy ProvedDevelopedandUndevelopedReservesNetEnergy	227920	MBoe
CY2010Q4	oas	Proved Developedand Undeveloped Reserves Net Energy ProvedDevelopedandUndevelopedReservesNetEnergy	39780	MBoe
CY2011Q4	oas	Proved Developedand Undeveloped Reserves Net Energy ProvedDevelopedandUndevelopedReservesNetEnergy	78715	MBoe
CY2012	oas	Proved Developedand Undeveloped Reserves Production Energy ProvedDevelopedandUndevelopedReservesProductionEnergy	8224	MBoe
CY2013	oas	Proved Developedand Undeveloped Reserves Production Energy ProvedDevelopedandUndevelopedReservesProductionEnergy	12375	MBoe
CY2011	oas	Proved Developedand Undeveloped Reserves Production Energy ProvedDevelopedandUndevelopedReservesProductionEnergy	3914	MBoe
CY2013	oas	Proved Developedand Undeveloped Reserves Purchasesof Mineralsin Place Energy ProvedDevelopedandUndevelopedReservesPurchasesofMineralsinPlaceEnergy	45731	MBoe
CY2012	oas	Proved Developedand Undeveloped Reserves Purchasesof Mineralsin Place Energy ProvedDevelopedandUndevelopedReservesPurchasesofMineralsinPlaceEnergy	966	MBoe
CY2011	oas	Proved Developedand Undeveloped Reserves Purchasesof Mineralsin Place Energy ProvedDevelopedandUndevelopedReservesPurchasesofMineralsinPlaceEnergy	111	MBoe
CY2011	oas	Proved Developedand Undeveloped Reserves Revisionsof Previous Estimates Energy ProvedDevelopedandUndevelopedReservesRevisionsofPreviousEstimatesEnergy	288	MBoe
CY2013	oas	Proved Developedand Undeveloped Reserves Revisionsof Previous Estimates Energy ProvedDevelopedandUndevelopedReservesRevisionsofPreviousEstimatesEnergy	5125	MBoe
CY2012	oas	Proved Developedand Undeveloped Reserves Revisionsof Previous Estimates Energy ProvedDevelopedandUndevelopedReservesRevisionsofPreviousEstimatesEnergy	1983	MBoe
CY2012	oas	Proved Developedand Undeveloped Reserves Salesof Mineralsin Place Energy ProvedDevelopedandUndevelopedReservesSalesofMineralsinPlaceEnergy	0	MBoe
CY2011	oas	Proved Developedand Undeveloped Reserves Salesof Mineralsin Place Energy ProvedDevelopedandUndevelopedReservesSalesofMineralsinPlaceEnergy	142	MBoe
CY2012Q4	oas	Proved Oil And Gas Properties Net ProvedOilAndGasPropertiesNet	1888147000	USD
CY2013Q4	oas	Proved Oil And Gas Properties Net ProvedOilAndGasPropertiesNet	3101145000	USD
CY2012	oas	Revenue Suspense RevenueSuspense	30000000	USD
CY2013	oas	Revenue Suspense RevenueSuspense	79700000	USD
CY2013Q4	oas	Revenues Payable And Production Taxes Current RevenuesPayableAndProductionTaxesCurrent	146741000	USD
CY2012Q4	oas	Revenues Payable And Production Taxes Current RevenuesPayableAndProductionTaxesCurrent	71553000	USD
CY2012	oas	Revisions Percentage RevisionsPercentage	0.025
CY2011	oas	Revisions Percentage RevisionsPercentage	0.007
CY2013	oas	Revisions Percentage RevisionsPercentage	0.036
CY2013Q4	oas	Sharebased Compensation Arrangementby Sharebased Payment Award Fair Value Output Expected Percentage Earned SharebasedCompensationArrangementbySharebasedPaymentAwardFairValueOutputExpectedPercentageEarned	1.12
CY2012Q4	oas	Sharebased Compensation Arrangementby Sharebased Payment Award Fair Value Output Expected Percentage Earned SharebasedCompensationArrangementbySharebasedPaymentAwardFairValueOutputExpectedPercentageEarned	0.98
CY2013Q4	oas	Treasury Stock At Cost TreasuryStockAtCost	167155	shares
CY2012Q4	oas	Treasury Stock At Cost TreasuryStockAtCost	129414	shares
CY2012Q4	oas	Treasury Stock Cost TreasuryStockCost	3796000	USD
CY2013Q4	oas	Treasury Stock Cost TreasuryStockCost	5362000	USD
CY2011	oas	Unweighted Arithmetic Average First Day Of Month Prices UnweightedArithmeticAverageFirstDayOfMonthPrices	96.23
CY2013	oas	Unweighted Arithmetic Average First Day Of Month Prices UnweightedArithmeticAverageFirstDayOfMonthPrices	96.96
CY2012	oas	Unweighted Arithmetic Average First Day Of Month Prices UnweightedArithmeticAverageFirstDayOfMonthPrices	94.68
CY2012	oas	Unweighted Arithmetic Average First Day Of Month Prices For Natural Gas UnweightedArithmeticAverageFirstDayOfMonthPricesForNaturalGas	2.75
CY2011	oas	Unweighted Arithmetic Average First Day Of Month Prices For Natural Gas UnweightedArithmeticAverageFirstDayOfMonthPricesForNaturalGas	4.12
CY2013	oas	Unweighted Arithmetic Average First Day Of Month Prices For Natural Gas UnweightedArithmeticAverageFirstDayOfMonthPricesForNaturalGas	3.66
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	0001486159
CY2014Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	101216201	shares
CY2013	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2013	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2013Q2	dei	Entity Public Float EntityPublicFloat	3636448683	USD
CY2013	dei	Entity Registrant Name EntityRegistrantName	Oasis Petroleum Inc.
CY2013	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2013	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2013	dei	Trading Symbol TradingSymbol	OAS

Files In Submission

Name	View Source	Status
0001486159-14-000011-index-headers.html	Edgar Link	pending
0001486159-14-000011-index.html	Edgar Link	pending
0001486159-14-000011.txt	Edgar Link	pending
0001486159-14-000011-xbrl.zip	Edgar Link	pending
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FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xls	Edgar Link	pending
Financial_Report.xlsx	Edgar Link	pending
oas-12312013x10k.htm	Edgar Link	pending
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oas-20131231.xml	Edgar Link	completed
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oas-20131231_cal.xml	Edgar Link	unprocessable
oas-20131231_def.xml	Edgar Link	unprocessable
oas-20131231_lab.xml	Edgar Link	unprocessable
oas-20131231_pre.xml	Edgar Link	unprocessable
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$CHRD
Chord Energy Corp Stock $chrd

2013 Q4 Form 10-K Financial Statement

#000148615914000011 Filed on February 27, 2014

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CHRD Chord Energy Corp Stock $chrd

2013 Q4 Form 10-K Financial Statement

#000148615914000011 Filed on February 27, 2014

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CHRD
Chord Energy Corp Stock $chrd