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CONSOLIDATED BALANCE SHEETS (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Current assets:    
Cash and cash equivalents $ 448us-gaap_CashAndCashEquivalentsAtCarryingValue $ 348us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts receivable, less allowance for doubtful accounts of $2,719 and $2,494 188,941us-gaap_AccountsReceivableNetCurrent 179,667us-gaap_AccountsReceivableNetCurrent
Derivative assets 363,049us-gaap_DerivativeAssetsCurrent 4,421us-gaap_DerivativeAssetsCurrent
Deferred tax assets   51,414us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Inventory and other 17,854us-gaap_InventoryNet 12,451us-gaap_InventoryNet
Total current assets 570,292us-gaap_AssetsCurrent 248,301us-gaap_AssetsCurrent
Derivative assets 40,314us-gaap_DerivativeAssetsNoncurrent 9,233us-gaap_DerivativeAssetsNoncurrent
Equity method investments   129,034us-gaap_EquityMethodInvestments
Natural gas and oil properties, successful efforts method 10,567,971us-gaap_OilAndGasPropertySuccessfulEffortMethodGross [1] 9,032,881us-gaap_OilAndGasPropertySuccessfulEffortMethodGross [1]
Accumulated depletion and depreciation (2,590,398)us-gaap_OilAndGasPropertySuccessfulEffortMethodAccumulatedDepreciationDepletionAndAmortization [1] (2,274,444)us-gaap_OilAndGasPropertySuccessfulEffortMethodAccumulatedDepreciationDepletionAndAmortization [1]
Natural gas and oil properties, successful efforts method, net 7,977,573us-gaap_OilAndGasPropertySuccessfulEffortMethodNet [1] 6,758,437us-gaap_OilAndGasPropertySuccessfulEffortMethodNet [1]
Other property and equipment 127,808us-gaap_PropertyPlantAndEquipmentOther 118,625us-gaap_PropertyPlantAndEquipmentOther
Accumulated depreciation and amortization (90,227)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (85,841)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Transportation and field assets, net 37,581us-gaap_PropertyPlantAndEquipmentNet 32,784us-gaap_PropertyPlantAndEquipmentNet
Other assets 121,020us-gaap_OtherAssetsNoncurrent 121,297us-gaap_OtherAssetsNoncurrent
Total assets 8,746,780us-gaap_Assets 7,299,086us-gaap_Assets
Current liabilities:    
Accounts payable 396,942us-gaap_AccountsPayableCurrent 258,431us-gaap_AccountsPayableCurrent
Asset retirement obligations 15,067us-gaap_AssetRetirementObligationCurrent 5,037us-gaap_AssetRetirementObligationCurrent
Accrued liabilities 187,973us-gaap_AccruedLiabilitiesCurrent 161,520us-gaap_AccruedLiabilitiesCurrent
Accrued interest 39,695us-gaap_InterestPayableCurrent 44,375us-gaap_InterestPayableCurrent
Derivative liabilities   26,198us-gaap_DerivativeLiabilitiesCurrent
Deferred tax liabilities 115,587us-gaap_DeferredTaxLiabilitiesCurrent  
Total current liabilities 755,264us-gaap_LiabilitiesCurrent 495,561us-gaap_LiabilitiesCurrent
Bank debt 723,000us-gaap_LongTermLineOfCredit 500,000us-gaap_LongTermLineOfCredit
Subordinated notes 2,350,000us-gaap_SubordinatedLongTermDebt 2,640,516us-gaap_SubordinatedLongTermDebt
Deferred tax liabilities 997,494us-gaap_DeferredTaxLiabilitiesNoncurrent 771,980us-gaap_DeferredTaxLiabilitiesNoncurrent
Derivative liabilities   25us-gaap_DerivativeLiabilitiesNoncurrent
Deferred compensation liabilities 178,599us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent 247,537us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent
Asset retirement obligations and other liabilities 284,994us-gaap_OilAndGasReclamationLiabilityNoncurrent 229,015us-gaap_OilAndGasReclamationLiabilityNoncurrent
Total liabilities 5,289,351us-gaap_Liabilities 4,884,634us-gaap_Liabilities
Commitments and contingencies      
Stockholders' Equity    
Preferred stock, $1 par 10,000,000 shares authorized, none issued and outstanding      
Common stock, $0.01 par 475,000,000 shares authorized, 168,711,131 issued at December 31, 2014 and 163,441,414 issued at December 31, 2013 1,687us-gaap_CommonStockValue 1,634us-gaap_CommonStockValue
Common stock held in treasury, 82,954 shares at December 31, 2014 and 98,520 shares at December 31, 2013 (3,088)us-gaap_TreasuryStockValue (3,637)us-gaap_TreasuryStockValue
Additional paid-in capital 2,400,475us-gaap_AdditionalPaidInCapitalCommonStock 1,959,636us-gaap_AdditionalPaidInCapitalCommonStock
Retained earnings 1,058,355us-gaap_RetainedEarningsAccumulatedDeficit 450,583us-gaap_RetainedEarningsAccumulatedDeficit
Accumulated other comprehensive income   6,236us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Total stockholders' equity 3,457,429us-gaap_StockholdersEquity 2,414,452us-gaap_StockholdersEquity
Total liabilities and stockholders' equity $ 8,746,780us-gaap_LiabilitiesAndStockholdersEquity $ 7,299,086us-gaap_LiabilitiesAndStockholdersEquity
[1] Includes capitalized asset retirement costs and the associated accumulated amortization.