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DERIVATIVE INSTRUMENTS (DETAILS 4) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Unrealized and Realized Gains (Losses) Recognized in Earnings for Derivatives Not Designated As Hedges [Line Items] |  |  |
Unrealized and realized gains (losses) recognized in earnings for derivatives not designated as hedges | $ (17,011)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet | $ 11,408 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet | $ 17,442 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
Investment Portfolio [Member] | Foreign Exchange Forward Contracts [Member] | Net Realized Investment Gains (Losses) [Member] |  |  |
Unrealized and Realized Gains (Losses) Recognized in Earnings for Derivatives Not Designated As Hedges [Line Items] |  |  |
Unrealized and realized gains (losses) recognized in earnings for derivatives not designated as hedges | 10,333 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_IncomeStatementLocationAxis = us-gaap_GainLossOnInvestmentsMember1 / axs_RelatedPortfolioAxis = axs_InvestmentPortfolioMember | 10,843 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_IncomeStatementLocationAxis = us-gaap_GainLossOnInvestmentsMember1 / axs_RelatedPortfolioAxis = axs_InvestmentPortfolioMember | (9,170)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_IncomeStatementLocationAxis = us-gaap_GainLossOnInvestmentsMember1 / axs_RelatedPortfolioAxis = axs_InvestmentPortfolioMember
Investment Portfolio [Member] | Interest Rate Swap [Member] | Net Realized Investment Gains (Losses) [Member] |  |  |
Unrealized and Realized Gains (Losses) Recognized in Earnings for Derivatives Not Designated As Hedges [Line Items] |  |  |
Unrealized and realized gains (losses) recognized in earnings for derivatives not designated as hedges | (19,936)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_IncomeStatementLocationAxis = us-gaap_GainLossOnInvestmentsMember1 / axs_RelatedPortfolioAxis = axs_InvestmentPortfolioMember | (3,112)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_IncomeStatementLocationAxis = us-gaap_GainLossOnInvestmentsMember1 / axs_RelatedPortfolioAxis = axs_InvestmentPortfolioMember | 0 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_IncomeStatementLocationAxis = us-gaap_GainLossOnInvestmentsMember1 / axs_RelatedPortfolioAxis = axs_InvestmentPortfolioMember
Underwriting Portfolio [Member] | Foreign Exchange Forward Contracts [Member] | Foreign Exchange Gains (Losses) [Member] |  |  |
Unrealized and Realized Gains (Losses) Recognized in Earnings for Derivatives Not Designated As Hedges [Line Items] |  |  |
Unrealized and realized gains (losses) recognized in earnings for derivatives not designated as hedges | (10,363)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_IncomeStatementLocationAxis = us-gaap_ForeignCurrencyGainLossMember / axs_RelatedPortfolioAxis = axs_UnderwritingPortfolioMember | 1,690 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_IncomeStatementLocationAxis = us-gaap_ForeignCurrencyGainLossMember / axs_RelatedPortfolioAxis = axs_UnderwritingPortfolioMember | 26,612 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_IncomeStatementLocationAxis = us-gaap_ForeignCurrencyGainLossMember / axs_RelatedPortfolioAxis = axs_UnderwritingPortfolioMember
Underwriting Portfolio [Member] | Weather Related Derivative [Member] | Other Insurance Related Income [Member] |  |  |
Unrealized and Realized Gains (Losses) Recognized in Earnings for Derivatives Not Designated As Hedges [Line Items] |  |  |
Unrealized and realized gains (losses) recognized in earnings for derivatives not designated as hedges | (5,373)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = axs_WeatherRelatedDerivativeMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherOperatingIncomeExpenseMember / axs_RelatedPortfolioAxis = axs_UnderwritingPortfolioMember | 1,987 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = axs_WeatherRelatedDerivativeMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherOperatingIncomeExpenseMember / axs_RelatedPortfolioAxis = axs_UnderwritingPortfolioMember | 0 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = axs_WeatherRelatedDerivativeMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherOperatingIncomeExpenseMember / axs_RelatedPortfolioAxis = axs_UnderwritingPortfolioMember
Underwriting Portfolio [Member] | Commodity Contract [Member] | Other Insurance Related Income [Member] |  |  |
Unrealized and Realized Gains (Losses) Recognized in Earnings for Derivatives Not Designated As Hedges [Line Items] |  |  |
Unrealized and realized gains (losses) recognized in earnings for derivatives not designated as hedges | $ 8,328 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherOperatingIncomeExpenseMember / axs_RelatedPortfolioAxis = axs_UnderwritingPortfolioMember | $ 0 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherOperatingIncomeExpenseMember / axs_RelatedPortfolioAxis = axs_UnderwritingPortfolioMember | $ 0 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherOperatingIncomeExpenseMember / axs_RelatedPortfolioAxis = axs_UnderwritingPortfolioMember

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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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