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SHAREHOLDERS' EQUITY (DETAILS 3) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended | 1 Months Ended | 6 Months Ended | 1 Months Ended | 0 Months Ended | 1 Months Ended
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jun. 30, 2013 | Dec. 17, 2012 | Mar. 31, 2012 | Oct. 31, 2005 | Jun. 30, 2013 | Jul. 15, 2013 | Apr. 30, 2013 | Nov. 30, 2005 | Jan. 15, 2013 | Mar. 03, 2014 | May 31, 2013
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on repurchase of preferred shares | $ 0 us-gaap_PreferredStockRedemptionPremium | $ 3,081 us-gaap_PreferredStockRedemptionPremium | $ 14,009 us-gaap_PreferredStockRedemptionPremium |  |  |  |  |  |  |  |  |  |  |
Preferred shares, aggregate liquidation value outstanding | 627,843 us-gaap_PreferredStockLiquidationPreferenceValue | 627,843 us-gaap_PreferredStockLiquidationPreferenceValue |  |  |  |  |  |  |  |  |  |  |  |
Aggregate cash payment to acquire preferred shares | 0 us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock | 100,000 us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock | 404,073 us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock |  |  |  |  |  |  |  |  |  |  |
Series A 7.25% Preferred Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred shares, aggregate liquidation value issued |  |  |  |  |  |  | 250,000 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  |  |  |  |  |
Preferred shares, dividend rate |  |  |  |  |  |  |  | 7.25%us-gaap_PreferredStockDividendRatePercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  |  |  |  |
Preferred shares, aggregate liquidation preference repurchased |  |  |  | 100,000 us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  | 150,000 us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  |  |  |  |  |  |
Preferred shares, par value per share |  |  |  | $ 0.0125 us-gaap_PreferredStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  |  | $ 0.0125 us-gaap_PreferredStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  |  |  |  |
Preferred shares, liquidation preference per share |  |  |  | $ 25.00 us-gaap_PreferredStockLiquidationPreference / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  |  | $ 25.00 us-gaap_PreferredStockLiquidationPreference / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  |  |  |  |
Preferred shares, dividend declared per share |  |  | $ 1.8125 us-gaap_PreferredStockDividendsPerShareDeclared / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  | $ 0.4531 us-gaap_PreferredStockDividendsPerShareDeclared / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  | $ 0.9063 us-gaap_PreferredStockDividendsPerShareDeclared / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  |  |  |  |
Preferred shares, dividends paid per share |  |  | $ 1.8125 us-gaap_PreferredStockDividendsPerShareCashPaid / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  |  |  |  | $ 1.3594 us-gaap_PreferredStockDividendsPerShareCashPaid / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  |  |  |
Preferred shares, number of shares repurchased |  |  |  | 4,000,000 us-gaap_StockRedeemedOrCalledDuringPeriodShares / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  | 6,000,000 us-gaap_StockRedeemedOrCalledDuringPeriodShares / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  |  |  |  |  |  |
Loss on repurchase of preferred shares |  |  |  | 3,000 us-gaap_PreferredStockRedemptionPremium / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  | 5,000 us-gaap_PreferredStockRedemptionPremium / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  |  |  |  |  |  |
Series B 7.50% Preferred Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred shares, aggregate liquidation value issued |  |  |  |  |  |  |  |  |  |  | 250,000 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |
Preferred shares, dividend rate | 7.50%us-gaap_PreferredStockDividendRatePercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred shares, par value per share | $ 0.0125 us-gaap_PreferredStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred shares, liquidation preference per share | $ 100.00 us-gaap_PreferredStockLiquidationPreference / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred shares, redemption price per share | $ 100.00 us-gaap_PreferredStockRedemptionPricePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred shares, floating dividend rate base | 3.4525%axs_PreferredStockDividendRatePercentageFloatingBaseRate / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred shares, dividend declared per share | $ 7.50 us-gaap_PreferredStockDividendsPerShareDeclared / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember | $ 7.50 us-gaap_PreferredStockDividendsPerShareDeclared / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember | $ 7.50 us-gaap_PreferredStockDividendsPerShareDeclared / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |  |  |  |  |  |  |  |
Preferred shares, dividends paid per share | $ 7.50 us-gaap_PreferredStockDividendsPerShareCashPaid / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember | $ 7.50 us-gaap_PreferredStockDividendsPerShareCashPaid / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember | $ 7.50 us-gaap_PreferredStockDividendsPerShareCashPaid / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |  |  |  |  |  |  |  |
Preferred shares, number of shares repurchased |  |  |  |  |  |  |  |  |  | 2,471,570 us-gaap_StockRedeemedOrCalledDuringPeriodShares / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |
Loss on repurchase of preferred shares |  |  |  |  |  |  |  |  |  | 9,000 us-gaap_PreferredStockRedemptionPremium / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |
Preferred shares, number of shares outstanding | 28,430 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred shares, aggregate liquidation value outstanding | 3,000 us-gaap_PreferredStockLiquidationPreferenceValue / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred shares, purchase price per share |  |  |  |  |  |  |  |  |  | $ 102.81 axs_PaymentsForRepurchaseOfPreferredStockAndPreferenceStockPerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |
Aggregate cash payment to acquire preferred shares |  |  |  |  |  |  |  |  |  | 254,000 us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |
Series C 6.875% Preferred Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred shares, aggregate liquidation value issued |  |  |  |  |  | 400,000 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |  |  |  |  |  |  |  |
Preferred shares, dividend rate | 6.875%us-gaap_PreferredStockDividendRatePercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred shares, par value per share | $ 0.0125 us-gaap_PreferredStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred shares, liquidation preference per share | $ 25.00 us-gaap_PreferredStockLiquidationPreference / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred shares, redemption price per share | $ 25.00 us-gaap_PreferredStockRedemptionPricePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred shares, dividend declared per share | $ 1.7188 us-gaap_PreferredStockDividendsPerShareDeclared / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember | $ 1.7188 us-gaap_PreferredStockDividendsPerShareDeclared / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember | $ 1.4132 us-gaap_PreferredStockDividendsPerShareDeclared / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |  |  |  |  |  |  |  |  |  |  |
Preferred shares, dividends paid per share | $ 1.7188 us-gaap_PreferredStockDividendsPerShareCashPaid / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember | $ 1.7188 us-gaap_PreferredStockDividendsPerShareCashPaid / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember | $ 0.9835 us-gaap_PreferredStockDividendsPerShareCashPaid / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |  |  |  |  |  |  |  |  | $ 0.4297 us-gaap_PreferredStockDividendsPerShareCashPaid / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |  |
Preferred shares, aggregate liquidation value outstanding | 400,000 us-gaap_PreferredStockLiquidationPreferenceValue / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |  |  |  |  |  |  |  |  |  |  |  |  |
Series D 5.50% Preferred Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred shares, aggregate liquidation value issued |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 225,000 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember
Preferred shares, dividend rate | 5.50%us-gaap_PreferredStockDividendRatePercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred shares, par value per share | $ 0.0125 us-gaap_PreferredStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred shares, liquidation preference per share | $ 25.00 us-gaap_PreferredStockLiquidationPreference / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred shares, redemption price per share | $ 25.00 us-gaap_PreferredStockRedemptionPricePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred shares, dividend declared per share | $ 1.3750 us-gaap_PreferredStockDividendsPerShareDeclared / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember | $ 0.6875 us-gaap_PreferredStockDividendsPerShareDeclared / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember |  |  |  |  |  |  |  |  |  |  |  |
Preferred shares, dividends paid per share | $ 1.3750 us-gaap_PreferredStockDividendsPerShareCashPaid / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember | $ 0.3438 us-gaap_PreferredStockDividendsPerShareCashPaid / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember |  |  |  |  |  |  |  |  |  |  | $ 0.3438 us-gaap_PreferredStockDividendsPerShareCashPaid / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember |

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