1.0.0.3 false CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data false 1 $ false false USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 USDPerShare Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 false 2 $ false false USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 USDPerShare Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 false 3 $ false false USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 USDPerShare Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 3 Revenues: 1 us-gaap_OilAndGasRevenueAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false 3 false false 0 0 false false No definition available. false 4 Gas sales 2 us-gaap_NaturalGasProductionRevenue us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 true true 485448000 485448 false false 2 true true 1074705000 1074705 false false 3 true true 845631000 845631 false false No definition available. No authoritative reference available. false 5 Oil sales 2 xec_OilSalesRevenue xec false credit duration monetary Revenue from the sale of oil, condensate and plant products. false false false false false false false false false 1 false true 476995000 476995 false false 2 false true 806186000 806186 false false 3 false true 518991000 518991 false false Revenue from the sale of oil, condensate and plant products. No authoritative reference available. false 6 Gas gathering, processing and other 2 xec_GasGatheringProcessingAndOtherRevenue xec false credit duration monetary The total of Natural Gas Midstream Revenue and Other Revenue. Natural Gas Midstream Revenue refers to those gas industry... false false false false false false false false false 1 false true 46763000 46763 false false 2 false true 87757000 87757 false false 3 false true 60818000 60818 false false The total of Natural Gas Midstream Revenue and Other Revenue. Natural Gas Midstream Revenue refers to those gas industry activities that fall between exploration and production (upstream) and refining and marketing (downstream). It may be applied to the gathering, processing, transmission and storage of natural gas; including the treating of natural gas to remove impurities, along with the sale of by-products such as residue gas, natural gas liquids and condensate. Other Revenue referes to those operating revenues not specified elsewhere, including non hydrocarbons. No authoritative reference available. false 7 Gas marketing, net of related costs of $68,719, $141,668 and $107,678 respectively 2 xec_GasMarketingRevenueNetOfRelatedCosts xec false credit duration monetary Revenue related to marketing of natural gas and related products, net of related costs. false false false false false false false false false 1 false true 588000 588 false false 2 false true 1699000 1699 false false 3 false true 5073000 5073 false false Revenue related to marketing of natural gas and related products, net of related costs. No authoritative reference available. false 8 Total revenues 2 us-gaap_Revenues us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 1009794000 1009794 false false 2 false true 1970347000 1970347 false false 3 false true 1430513000 1430513 false false No definition available. No authoritative reference available. true 9 Costs and expenses: 1 us-gaap_CostsAndExpensesAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false 3 false false 0 0 false false No definition available. false 10 Impairment of oil and gas properties 2 us-gaap_ImpairmentOfOilAndGasProperties us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 791137000 791137 false false 2 false true 2242921000 2242921 false false 3 false false 0 0 false false No definition available. No authoritative reference available. false 11 Depreciation, depletion and amortization 2 us-gaap_ResultsOfOperationsDepreciationDepletionAndAmortizationAndValuationProvisions us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 265699000 265699 false false 2 false true 547404000 547404 false false 3 false true 461791000 461791 false false No definition available. No authoritative reference available. false 12 Asset retirement obligation 2 xec_AssetRetirementObligationIncludingPluggingAndAbandonment xec false debit duration monetary Accretion expense of asset retirement obligations related to oil and gas producing activities, including gains or losses of... false false false false false false false false false 1 false true 12313000 12313 false false 2 false true 8796000 8796 false false 3 false true 8937000 8937 false false Accretion expense of asset retirement obligations related to oil and gas producing activities, including gains or losses of plugging and abandonments. No authoritative reference available. false 13 Production 2 us-gaap_ResultsOfOperationsProductionOrLiftingCosts us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 178215000 178215 false false 2 false true 218736000 218736 false false 3 false true 201512000 201512 false false No definition available. No authoritative reference available. false 14 Transportation 2 us-gaap_ResultsOfOperationsTransportationCosts us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 33758000 33758 false false 2 false true 38107000 38107 false false 3 false true 26361000 26361 false false No definition available. No authoritative reference available. false 15 Gas gathering and processing 2 xec_GasGatheringAndProcessingCosts xec false debit duration monetary The total of Natural Gas Midstream costs. Natural Gas Midstream costs refers to those gas industry activities that fall... false false false false false false false false false 1 false true 20560000 20560 false false 2 false true 43838000 43838 false false 3 false true 29860000 29860 false false The total of Natural Gas Midstream costs. Natural Gas Midstream costs refers to those gas industry activities that fall between exploration and production (upstream) and refining and marketing (downstream). It may be applied to the gathering, processing, transmission and storage of natural gas; including the treating of natural gas to remove impurities. No authoritative reference available. false 16 Taxes other than income 2 xec_TaxesOtherThanIncome xec false debit duration monetary All taxes other than income taxes, mainly production severance taxes and ad valorem taxes. false false false false false false false false false 1 false true 75634000 75634 false false 2 false true 130490000 130490 false false 3 false true 93630000 93630 false false All taxes other than income taxes, mainly production severance taxes and ad valorem taxes. No authoritative reference available. false 17 General and administrative 2 us-gaap_GeneralAndAdministrativeExpense us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 41724000 41724 false false 2 false true 44500000 44500 false false 3 false true 49260000 49260 false false No definition available. No authoritative reference available. false 18 Stock compensation, net 2 us-gaap_ShareBasedCompensation us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 9254000 9254 false false 2 false true 10090000 10090 false false 3 false true 10772000 10772 false false No definition available. No authoritative reference available. false 19 Loss on derivative instruments, net 2 xec_GainLossOnDerivativeInstrumentsOperatingCostsAndExpenses xec false credit duration monetary Aggregate net gain (loss)on all derivative instruments for which hedge accounting was not applied and that are part of... false false false false false false false false false 1 false true 13059000 13059 false false 2 false false 0 0 false false 3 false false 0 0 false false Aggregate net gain (loss)on all derivative instruments for which hedge accounting was not applied and that are part of operating costs and expenses. No authoritative reference available. false 20 Other operating, net 2 us-gaap_OtherCostAndExpenseOperating us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 24263000 24263 false false 2 false true 126433000 126433 false false 3 false true 6637000 6637 false false No definition available. No authoritative reference available. false 21 Total costs and expenses 2 us-gaap_CostsAndExpenses us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 1465616000 1465616 false false 2 false true 3411315000 3411315 false false 3 false true 888760000 888760 false false No definition available. No authoritative reference available. true 22 Operating income (loss) 1 us-gaap_OperatingIncomeLoss us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -455822000 -455822 false false 2 false true -1440968000 -1440968 false false 3 false true 541753000 541753 false false No definition available. No authoritative reference available. true 23 Other (income) and expense: 1 us-gaap_NonoperatingIncomeExpenseAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false 3 false false 0 0 false false No definition available. false 24 Interest expense 2 us-gaap_InterestCostsIncurred us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 39777000 39777 false false 2 false true 33079000 33079 false false 3 false true 39105000 39105 false false No definition available. No authoritative reference available. false 25 Capitalized interest 2 us-gaap_InterestCostsCapitalized us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true -23408000 -23408 false false 2 false true -22108000 -22108 false false 3 false true -19680000 -19680 false false No definition available. No authoritative reference available. false 26 Amortization of fair value of debt 2 us-gaap_AmortizationOfDebtDiscountPremium us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false false 0 0 false false 2 false false 0 0 false false 3 false true -1146000 -1146 false false No definition available. No authoritative reference available. false 27 (Gain) loss on early extinquishment of debt 2 us-gaap_GainsLossesOnExtinguishmentOfDebt us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false false 0 0 false false 2 false true 10058000 10058 false false 3 false true -5099000 -5099 false false No definition available. No authoritative reference available. false 28 Other, net 2 us-gaap_OtherNonoperatingIncomeExpense us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 16290000 16290 false false 2 false true -10348000 -10348 false false 3 false true -14151000 -14151 false false No definition available. No authoritative reference available. false 29 Income (loss) before income tax 1 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -488481000 -488481 false false 2 false true -1451649000 -1451649 false false 3 false true 542724000 542724 false false No definition available. No authoritative reference available. true 30 Income tax expense (benefit) 1 us-gaap_IncomeTaxExpenseBenefit us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true -176538000 -176538 false false 2 false true -536404000 -536404 false false 3 false true 197462000 197462 false false No definition available. No authoritative reference available. false 31 Net income (loss) 1 us-gaap_ProfitLoss us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 true true -311943000 -311943 false false 2 true true -915245000 -915245 false false 3 true true 345262000 345262 false false No definition available. No authoritative reference available. true 33 Earnings (loss) per share to common stockholders: Basic 2 us-gaap_EarningsPerShareBasicAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false 3 false false 0 0 false false No definition available. false 34 Distributed (in dollars per share) 3 xec_EarningsLossPerShareBasicDistributed xec false na duration decimal Under the two-class earnings allocation method, dividends declared during the period attributable to basic common... false false false false false false false false true 1 true true 0.24 0.24 false false 2 true true 0.24 0.24 false false 3 true true 0.18 0.18 false false Under the two-class earnings allocation method, dividends declared during the period attributable to basic common stockholders. No authoritative reference available. false 35 Undistributed (in dollars per share) 3 xec_EarningsLossPerShareBasicUndistributed xec false na duration decimal Under the two-class earnings allocation method, undistributed earnings (loss) during the period attributable to basic common... false false false false false false false false true 1 true true -4.06 -4.06 false false 2 true true -11.46 -11.46 false false 3 true true 3.97 3.97 false false Under the two-class earnings allocation method, undistributed earnings (loss) during the period attributable to basic common stockholders. No authoritative reference available. false 36 Total basic (in dollars per share) 3 xec_EarningsLossPerShareBasicDistributedAndUndistributed xec false na duration decimal Total earnings (loss) for the period allocated to basic common stockholders. false false false false false false false false true 1 true true -3.82 -3.82 false false 2 true true -11.22 -11.22 false false 3 true true 4.15 4.15 false false Total earnings (loss) for the period allocated to basic common stockholders. No authoritative reference available. true 37 Earnings (loss) per share to common stockholders: Diluted 2 us-gaap_EarningsPerShareDilutedAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false 3 false false 0 0 false false No definition available. false 38 Distributed (in dollars per share) 3 xec_EarningsLossPerShareDilutedDistributed xec false na duration decimal Under the two-class earnings allocation method, dividends declared during the period attributable to fully diluted common... false false false false false false false false true 1 true true 0.24 0.24 false false 2 true true 0.24 0.24 false false 3 true true 0.18 0.18 false false Under the two-class earnings allocation method, dividends declared during the period attributable to fully diluted common stockholders. No authoritative reference available. false 39 Undistributed (in dollars per share) 3 xec_EarningsLossPerShareDilutedUndistributed xec false na duration decimal Under the two-class earnings allocation method, undistributed earnings (loss) during the period attributable to fully diluted... false false false false false false false false true 1 true true -4.06 -4.06 false false 2 true true -11.46 -11.46 false false 3 true true 3.87 3.87 false false Under the two-class earnings allocation method, undistributed earnings (loss) during the period attributable to fully diluted common stockholders. No authoritative reference available. false 40 Total diluted (in dollars per share) 3 xec_EarningsLossPerShareDilutedDistributedAndUndistributed xec false na duration decimal Total earnings (loss) for the period allocated to fully diluted common stockholders. false false false false false false false false true 1 true true -3.82 -3.82 false false 2 true true -11.22 -11.22 false false 3 true true 4.05 4.05 false false Total earnings (loss) for the period allocated to fully diluted common stockholders. No authoritative reference available. true false 3 37 false Thousands UnKnown Hundreds false true