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CONSOLIDATED BALANCE SHEETS (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
ASSETS    
Cash and Cash Equivalents $ 2,071us-gaap_CashAndCashEquivalentsAtCarryingValue $ 2,967us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts Receivable:    
Oil and gas sales 32,849us-gaap_AccountsReceivableNetCurrent 35,728us-gaap_AccountsReceivableNetCurrent
Joint interest operations 16,192us-gaap_OilAndGasJointInterestBillingReceivablesCurrent 15,534us-gaap_OilAndGasJointInterestBillingReceivablesCurrent
Other Current Assets 10,105us-gaap_OtherAssetsCurrent 2,905us-gaap_OtherAssetsCurrent
Total current assets 61,217us-gaap_AssetsCurrent 57,134us-gaap_AssetsCurrent
Property and Equipment:    
Unevaluated oil and gas properties 201,459us-gaap_UnprovedOilAndGasPropertySuccessfulEffortMethod 134,350us-gaap_UnprovedOilAndGasPropertySuccessfulEffortMethod
Oil and gas properties, successful efforts method 4,282,088us-gaap_ProvedOilAndGasPropertySuccessfulEffortMethod 3,781,313us-gaap_ProvedOilAndGasPropertySuccessfulEffortMethod
Other 19,630us-gaap_PropertyPlantAndEquipmentOther 18,373us-gaap_PropertyPlantAndEquipmentOther
Accumulated depreciation, depletion and amortization (2,305,008)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (1,867,301)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Net property and equipment 2,198,169us-gaap_PropertyPlantAndEquipmentNet 2,066,735us-gaap_PropertyPlantAndEquipmentNet
Other Assets 14,951us-gaap_OtherAssetsNoncurrent 15,529us-gaap_OtherAssetsNoncurrent
Total Assets 2,274,337us-gaap_Assets 2,139,398us-gaap_Assets
LIABILITIES AND STOCKHOLDERS’ EQUITY    
Accounts Payable 117,329us-gaap_AccountsPayableCurrent 101,872us-gaap_AccountsPayableCurrent
Income Taxes Payable   1,826us-gaap_TaxesPayableCurrent
Accrued Expenses 44,842us-gaap_AccruedLiabilitiesCurrent 91,297us-gaap_AccruedLiabilitiesCurrent
Total current liabilities 162,171us-gaap_LiabilitiesCurrent 194,995us-gaap_LiabilitiesCurrent
Long-term Debt 1,070,445us-gaap_LongTermDebtNoncurrent 798,700us-gaap_LongTermDebtNoncurrent
Deferred Income Taxes Payable 154,547us-gaap_DeferredTaxLiabilitiesNoncurrent 177,026us-gaap_DeferredTaxLiabilitiesNoncurrent
Reserve for Future Abandonment Costs 14,900us-gaap_AssetRetirementObligationsNoncurrent 14,534us-gaap_AssetRetirementObligationsNoncurrent
Other Non-Current Liabilities 2,002us-gaap_OtherLiabilitiesNoncurrent 2,138us-gaap_OtherLiabilitiesNoncurrent
Total liabilities 1,404,065us-gaap_Liabilities 1,187,393us-gaap_Liabilities
Commitments and Contingencies      
Stockholders' Equity:    
Common stock—$0.50 par, 75,000,000 shares authorized, 47,680,516 and 46,858,415 shares issued and outstanding at December 31, 2013 and 2014, respectively 23,429us-gaap_CommonStockValue 23,840us-gaap_CommonStockValue
Additional paid-in capital 480,434us-gaap_AdditionalPaidInCapitalCommonStock 480,816us-gaap_AdditionalPaidInCapitalCommonStock
Retained earnings 366,409us-gaap_RetainedEarningsAccumulatedDeficit 447,349us-gaap_RetainedEarningsAccumulatedDeficit
Total stockholders’ equity 870,272us-gaap_StockholdersEquity 952,005us-gaap_StockholdersEquity
Total liabilities and stockholders' equity $ 2,274,337us-gaap_LiabilitiesAndStockholdersEquity $ 2,139,398us-gaap_LiabilitiesAndStockholdersEquity