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Condensed Consolidated Balance Sheets (Unaudited) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Current assets    
Cash and cash equivalents $ 6,021us-gaap_CashAndCashEquivalentsAtCarryingValue $ 23,153us-gaap_CashAndCashEquivalentsAtCarryingValue
Accrued production receivable 148,125us-gaap_OtherReceivables 181,761us-gaap_OtherReceivables
Trade and other receivables, net 139,904us-gaap_AccountsReceivableNetCurrent 156,955us-gaap_AccountsReceivableNetCurrent
Derivative assets 421,702us-gaap_CommodityContractAssetCurrent 440,359us-gaap_CommodityContractAssetCurrent
Deferred tax assets 42,268us-gaap_DeferredTaxAssetsNetCurrent 0us-gaap_DeferredTaxAssetsNetCurrent
Other current assets 10,634us-gaap_OtherAssetsCurrent 10,452us-gaap_OtherAssetsCurrent
Total current assets 768,654us-gaap_AssetsCurrent 812,680us-gaap_AssetsCurrent
Oil and natural gas properties (using full cost accounting)    
Proved properties 9,873,513us-gaap_CapitalizedCostsProvedProperties 9,782,337us-gaap_CapitalizedCostsProvedProperties
Unevaluated properties 933,566us-gaap_CapitalizedCostsUnprovedProperties 918,406us-gaap_CapitalizedCostsUnprovedProperties
CO2 properties 1,171,815dnr_Co2Properties 1,162,538dnr_Co2Properties
Pipelines and plants 2,272,184dnr_PipelinesAndPlants 2,269,564dnr_PipelinesAndPlants
Other property and equipment 465,886us-gaap_PropertyPlantAndEquipmentOther 468,051us-gaap_PropertyPlantAndEquipmentOther
Less accumulated depletion, depreciation, amortization and impairment (4,536,890)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (4,248,652)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Net property and equipment 10,180,074us-gaap_PropertyPlantAndEquipmentNet 10,352,244us-gaap_PropertyPlantAndEquipmentNet
Derivative assets 19,456us-gaap_CommodityContractAssetNoncurrent 66,187us-gaap_CommodityContractAssetNoncurrent
Goodwill 1,283,590us-gaap_Goodwill 1,283,590us-gaap_Goodwill
Other assets 216,282us-gaap_OtherAssetsNoncurrent 213,101us-gaap_OtherAssetsNoncurrent
Total assets 12,468,056us-gaap_Assets 12,727,802us-gaap_Assets
Current liabilities    
Accounts payable and accrued liabilities 234,541us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent 394,758us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent
Oil and gas production payable 110,454us-gaap_AccountsPayableOtherCurrent 128,170us-gaap_AccountsPayableOtherCurrent
Deferred tax liabilities 0us-gaap_DeferredTaxLiabilitiesCurrent 81,727us-gaap_DeferredTaxLiabilitiesCurrent
Current maturities of long-term debt 36,679us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent 35,470us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent
Total current liabilities 381,674us-gaap_LiabilitiesCurrent 640,125us-gaap_LiabilitiesCurrent
Long-term liabilities    
Long-term debt, net of current portion 3,596,085us-gaap_LongTermDebtAndCapitalLeaseObligations 3,535,900us-gaap_LongTermDebtAndCapitalLeaseObligations
Asset retirement obligations 128,599us-gaap_AssetRetirementObligationsNoncurrent 126,411us-gaap_AssetRetirementObligationsNoncurrent
Deferred tax liabilities 2,752,857us-gaap_DeferredTaxLiabilitiesNoncurrent 2,694,842us-gaap_DeferredTaxLiabilitiesNoncurrent
Other liabilities 25,360us-gaap_OtherLiabilitiesNoncurrent 26,668us-gaap_OtherLiabilitiesNoncurrent
Total long-term liabilities 6,502,901us-gaap_LiabilitiesNoncurrent 6,383,821us-gaap_LiabilitiesNoncurrent
Commitments and contingencies (Note 6)      
Stockholders' equity    
Preferred stock, $.001 par value, 25,000,000 shares authorized, none issued and outstanding 0us-gaap_PreferredStockValue 0us-gaap_PreferredStockValue
Common stock, $.001 par value, 600,000,000 shares authorized; 415,665,644 and 411,779,911 shares issued, respectively 416us-gaap_CommonStockValue 412us-gaap_CommonStockValue
Paid-in capital in excess of par 3,238,914us-gaap_AdditionalPaidInCapital 3,230,418us-gaap_AdditionalPaidInCapital
Retained earnings 3,262,508us-gaap_RetainedEarningsAccumulatedDeficit 3,392,465us-gaap_RetainedEarningsAccumulatedDeficit
Accumulated other comprehensive loss (192)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (209)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Treasury stock, at cost, 58,651,623 and 58,415,507 shares, respectively (918,165)us-gaap_TreasuryStockValue (919,230)us-gaap_TreasuryStockValue
Total stockholders' equity 5,583,481us-gaap_StockholdersEquity 5,703,856us-gaap_StockholdersEquity
Total liabilities and stockholders' equity $ 12,468,056us-gaap_LiabilitiesAndStockholdersEquity $ 12,727,802us-gaap_LiabilitiesAndStockholdersEquity