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CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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ASSETS |  |
Cash and cash equivalents | $ 120 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 282,248 us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts receivable (Note 2) | 322,630 us-gaap_AccountsReceivableNetCurrent | 318,371 us-gaap_AccountsReceivableNetCurrent
Derivative asset | 402,668 us-gaap_DerivativeAssetsCurrent | 21,559 us-gaap_DerivativeAssetsCurrent
Deferred income taxes | 0 us-gaap_DeferredTaxAssetsNetCurrent | 10,749 us-gaap_DeferredTaxAssetsNetCurrent
Prepaid expenses and other | 19,625 us-gaap_PrepaidExpenseAndOtherAssetsCurrent | 14,574 us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Total current assets | 745,043 us-gaap_AssetsCurrent | 647,501 us-gaap_AssetsCurrent
Proved oil and gas properties | 7,348,436 us-gaap_ProvedOilAndGasPropertySuccessfulEffortMethod | 5,637,462 us-gaap_ProvedOilAndGasPropertySuccessfulEffortMethod
Less - accumulated depletion, depreciation, and amortization | (3,233,012)us-gaap_OilAndGasPropertySuccessfulEffortMethodAccumulatedDepreciationDepletionAndAmortization | (2,583,698)us-gaap_OilAndGasPropertySuccessfulEffortMethodAccumulatedDepreciationDepletionAndAmortization
Unproved oil and gas properties | 532,498 us-gaap_UnprovedOilAndGasPropertySuccessfulEffortMethod | 271,100 us-gaap_UnprovedOilAndGasPropertySuccessfulEffortMethod
Wells in progress | 503,734 us-gaap_WellsInProcessOfDrilling | 279,654 us-gaap_WellsInProcessOfDrilling
Oil and gas properties held for sale, net of accumulated depletion, depreciation and amortization of $22,482 and $7,390, respectively | 17,891 us-gaap_DisposalGroupIncludingDiscontinuedOperationLongLivedAssetsCurrent | 19,072 us-gaap_DisposalGroupIncludingDiscontinuedOperationLongLivedAssetsCurrent
Other property and equipment, net of accumulated depreciation of $37,079 and $28,775, respectively | 334,356 us-gaap_PropertyPlantAndEquipmentOtherNet | 236,202 us-gaap_PropertyPlantAndEquipmentOtherNet
Total property and equipment, net | 5,503,903 us-gaap_PropertyPlantAndEquipmentNet | 3,859,792 us-gaap_PropertyPlantAndEquipmentNet
Derivative asset | 189,540 us-gaap_DerivativeAssetsNoncurrent | 30,951 us-gaap_DerivativeAssetsNoncurrent
Restricted cash | 0 us-gaap_RestrictedCashAndCashEquivalentsNoncurrent | 96,713 us-gaap_RestrictedCashAndCashEquivalentsNoncurrent
Other noncurrent assets | 78,214 us-gaap_OtherAssetsNoncurrent | 70,208 us-gaap_OtherAssetsNoncurrent
Total other noncurrent assets | 267,754 us-gaap_AssetsNoncurrent | 197,872 us-gaap_AssetsNoncurrent
Total Assets | 6,516,700 us-gaap_Assets | 4,705,165 us-gaap_Assets
LIABILITIES |  |
Accounts payable and accrued expenses (note 2) | 640,684 us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent | 606,751 us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent
Derivative liability | 0 us-gaap_DerivativeLiabilitiesCurrent | 26,380 us-gaap_DerivativeLiabilitiesCurrent
Deferred tax liability | 142,976 us-gaap_DeferredTaxLiabilitiesCurrent | 0 us-gaap_DeferredTaxLiabilitiesCurrent
Other current liabilities | 1,000 us-gaap_OtherLiabilitiesCurrent | 6,000 us-gaap_OtherLiabilitiesCurrent
Total current liabilities | 784,660 us-gaap_LiabilitiesCurrent | 639,131 us-gaap_LiabilitiesCurrent
Revolving credit facility | 166,000 us-gaap_LineOfCredit | 0 us-gaap_LineOfCredit
Senior Notes (note 5) | 2,200,000 us-gaap_SeniorNotes | 1,600,000 us-gaap_SeniorNotes
Asset retirement obligation | 120,867 us-gaap_AssetRetirementObligationsNoncurrent | 118,692 us-gaap_AssetRetirementObligationsNoncurrent
Net Profits Plan liability | 27,136 us-gaap_DeferredCompensationCashbasedArrangementsLiabilityClassifiedNoncurrent | 56,985 us-gaap_DeferredCompensationCashbasedArrangementsLiabilityClassifiedNoncurrent
Deferred income taxes; Net, non-current | 891,681 us-gaap_DeferredTaxLiabilitiesNoncurrent | 650,125 us-gaap_DeferredTaxLiabilitiesNoncurrent
Derivative liability | 70 us-gaap_DerivativeLiabilitiesNoncurrent | 4,640 us-gaap_DerivativeLiabilitiesNoncurrent
Other noncurrent liabilities | 39,631 us-gaap_OtherLiabilitiesNoncurrent | 28,771 us-gaap_OtherLiabilitiesNoncurrent
Total noncurrent liabilities | 3,445,385 us-gaap_LiabilitiesNoncurrent | 2,459,213 us-gaap_LiabilitiesNoncurrent
Commitments and contingencies (note 6) |  |
STOCKHOLDERS' EQUITY |  |
Common stock, $0.01 par value - authorized: 200,000,000 shares; issued: 67,463,060 and 67,078,853 shares outstanding, respectively; net of treasury shares: 67,463,060 and 67,056,441, respectively | 675 us-gaap_CommonStockValue | 671 us-gaap_CommonStockValue
Additional paid-in capital | 283,295 us-gaap_AdditionalPaidInCapitalCommonStock | 257,720 us-gaap_AdditionalPaidInCapitalCommonStock
Treasury stock, at cost: zero and 22,412, respectively | 0 us-gaap_TreasuryStockValue | (823)us-gaap_TreasuryStockValue
Retained earnings | 2,013,997 us-gaap_RetainedEarningsAccumulatedDeficit | 1,354,669 us-gaap_RetainedEarningsAccumulatedDeficit
Accumulated other comprehensive loss | (11,312)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | (5,416)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Total stockholders' equity | 2,286,655 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 1,606,821 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Total Liabilities and Stockholders' Equity | $ 6,516,700 us-gaap_LiabilitiesAndStockholdersEquity | $ 4,705,165 us-gaap_LiabilitiesAndStockholdersEquity

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- Definition The number of wells in the process of being drilled in each geographic area as of the date listed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Industry Guide -Number 2 -Paragraph 7 + Details
Name: | us-gaap_WellsInProcessOfDrilling
Namespace Prefix: | us-gaap_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant