2.4.0.82408407 - Disclosure - Derivatives (Derivatives Other Than Cash Flow Hedges Table) (Details)truefalseIn Thousands, unless otherwise specifiedfalse1false USDfalsefalse$I2013Q2http://www.sec.gov/CIK0001209821instant2013-06-30T00:00:000001-01-01T00:00:00usdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$2false USDfalsefalse$I2012Q4http://www.sec.gov/CIK0001209821instant2012-12-31T00:00:000001-01-01T00:00:00usdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$1true 3us-gaap_DerivativeLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Derivative [Line Items]2false 4us-gaap_DerivativeAssetsLiabilitiesAtFairValueNetus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalsetotalLabel1truefalsefalse27270002727USD$falsetruefalse2truefalsefalse19240001924USD$falsetruefalsexbrli:monetaryItemTypemonetaryFair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. 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This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. true2Derivative Assets (Liabilities), at Fair Value, Net3false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3false USDtruefalse$I2013Q2_us-gaap_HedgingDesignationAxis_us-gaap_NondesignatedMemberhttp://www.sec.gov/CIK0001209821instant2013-06-30T00:00:000001-01-01T00:00:00falsefalseNon Designated as Hedging Instrument [Member]us-gaap_HedgingDesignationAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_NondesignatedMemberus-gaap_HedgingDesignationAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Non Designated as Hedging Instrument [Member]4true 3us-gaap_DerivativeLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Derivative [Line Items]5false 4xtxi_FairValueMaturityLessThanOneYearxtxi_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse15480001548USD$falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryThe fair value of all commodity derivatives, other than cash flow hedges, that will mature within the next twelve monthsNo definition available.false2Less than one year6false 4xtxi_FairValueMaturityBetweenOneAndTwoYearsxtxi_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse00USD$falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryThe fair value of all commodity derivatives, other than cash flow hedges, that will mature in one to two years.No definition available.false2One to two years7false 4xtxi_FairValueMaturityAfterTwoYearsxtxi_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse00USD$falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryThe fair value of all commodity derivatives, other than cash flow hedges, that will mature after two years.No definition available.false2More than two years8false 4us-gaap_DerivativeAssetsLiabilitiesAtFairValueNetus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalsetotalLabel1truefalsefalse15480001548USD$falsetruefalse2falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryFair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. 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