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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 $ 23,153us-gaap_CashAndCashEquivalentsAtCarryingValue $ 12,187us-gaap_CashAndCashEquivalentsAtCarryingValue
Accrued production receivable 181,761us-gaap_OtherReceivables 262,047us-gaap_OtherReceivables
Trade and other receivables, net 156,955us-gaap_AccountsReceivableNetCurrent 78,295us-gaap_AccountsReceivableNetCurrent
Derivative assets 440,359us-gaap_CommodityContractAssetCurrent 5us-gaap_CommodityContractAssetCurrent
Deferred tax assets 0us-gaap_DeferredTaxAssetsNetCurrent 52,754us-gaap_DeferredTaxAssetsNetCurrent
Other current assets 10,452us-gaap_OtherAssetsCurrent 9,271us-gaap_OtherAssetsCurrent
Total current assets 812,680us-gaap_AssetsCurrent 414,559us-gaap_AssetsCurrent
Oil and natural gas properties (using full cost accounting)    
Proved properties 9,782,337us-gaap_CapitalizedCostsProvedProperties 8,945,326us-gaap_CapitalizedCostsProvedProperties
Unevaluated properties 918,406us-gaap_CapitalizedCostsUnprovedProperties 780,481us-gaap_CapitalizedCostsUnprovedProperties
CO2 properties 1,162,538dnr_Co2Properties 1,117,167dnr_Co2Properties
Pipelines and plants 2,269,564dnr_PipelinesAndPlants 2,209,560dnr_PipelinesAndPlants
Other property and equipment 468,051us-gaap_PropertyPlantAndEquipmentOther 466,969us-gaap_PropertyPlantAndEquipmentOther
Less accumulated depletion, depreciation, amortization and impairment (4,248,652)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (3,668,225)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Net property and equipment 10,352,244us-gaap_PropertyPlantAndEquipmentNet 9,851,278us-gaap_PropertyPlantAndEquipmentNet
Derivative assets 66,187us-gaap_CommodityContractAssetNoncurrent 9,942us-gaap_CommodityContractAssetNoncurrent
Goodwill 1,283,590us-gaap_Goodwill 1,283,590us-gaap_Goodwill
Other assets 213,101us-gaap_OtherAssetsNoncurrent 229,368us-gaap_OtherAssetsNoncurrent
Total assets 12,727,802us-gaap_Assets 11,788,737us-gaap_Assets
Current liabilities    
Accounts payable and accrued liabilities 394,758us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent 410,543us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent
Oil and gas production payable 128,170us-gaap_AccountsPayableOtherCurrent 174,677us-gaap_AccountsPayableOtherCurrent
Derivative liabilities 0us-gaap_HedgingLiabilitiesCurrent 53,822us-gaap_HedgingLiabilitiesCurrent
Deferred tax liabilities 81,727us-gaap_DeferredTaxLiabilitiesCurrent 0us-gaap_DeferredTaxLiabilitiesCurrent
Current maturities of long-term debt 35,470us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent 36,157us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent
Total current liabilities 640,125us-gaap_LiabilitiesCurrent 675,199us-gaap_LiabilitiesCurrent
Long-term liabilities    
Long-term debt, net of current portion 3,535,900us-gaap_LongTermDebtAndCapitalLeaseObligations 3,260,625us-gaap_LongTermDebtAndCapitalLeaseObligations
Asset retirement obligations 126,411us-gaap_AssetRetirementObligationsNoncurrent 119,888us-gaap_AssetRetirementObligationsNoncurrent
Derivative liabilities 0us-gaap_HedgingLiabilitiesNoncurrent 3,413us-gaap_HedgingLiabilitiesNoncurrent
Deferred tax liabilities 2,694,842us-gaap_DeferredTaxLiabilitiesNoncurrent 2,399,294us-gaap_DeferredTaxLiabilitiesNoncurrent
Other liabilities 26,668us-gaap_OtherLiabilitiesNoncurrent 28,912us-gaap_OtherLiabilitiesNoncurrent
Total long-term liabilities 6,383,821us-gaap_LiabilitiesNoncurrent 5,812,132us-gaap_LiabilitiesNoncurrent
Commitments and contingencies (Note 11)      
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; 411,779,911 and 409,215,573 shares issued, respectively 412us-gaap_CommonStockValue 409us-gaap_CommonStockValue
Paid-in capital in excess of par 3,230,418us-gaap_AdditionalPaidInCapital 3,186,714us-gaap_AdditionalPaidInCapital
Retained earnings 3,392,465us-gaap_RetainedEarningsAccumulatedDeficit 2,844,432us-gaap_RetainedEarningsAccumulatedDeficit
Accumulated other comprehensive loss (209)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (276)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Treasury stock, at cost, 58,415,507 and 46,710,896 shares, respectively (919,230)us-gaap_TreasuryStockValue (729,873)us-gaap_TreasuryStockValue
Total stockholders' equity 5,703,856us-gaap_StockholdersEquity 5,301,406us-gaap_StockholdersEquity
Total liabilities and stockholders' equity $ 12,727,802us-gaap_LiabilitiesAndStockholdersEquity $ 11,788,737us-gaap_LiabilitiesAndStockholdersEquity