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RESERVE FOR LOSSES AND LOSS EXPENSES (DETAILS 2) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Reconciliation of Beginning and Ending Gross Unpaid Losses and Loss Expenses |  |  |
Gross reserve for losses and loss expenses, beginning of year | $ 9,582,140 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense | $ 9,058,731 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense | $ 8,425,045 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense
Less reinsurance recoverable on unpaid losses, beginning of year | (1,900,112)us-gaap_ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments | (1,825,617)us-gaap_ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments | (1,736,823)us-gaap_ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments
Net reserve for unpaid losses and loss expenses, beginning of year | 7,682,028 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet | 7,233,114 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet | 6,688,222 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet
Net incurred losses and loss expenses related to: |  |  |
Current year | 2,445,666 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense | 2,353,631 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense | 2,340,868 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense
Prior years | (258,944)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense | (219,436)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense | (244,840)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense
Net incurred losses and loss expenses | 2,186,722 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1 | 2,134,195 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1 | 2,096,028 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1
Net paid losses and loss expenses related to: |  |  |
Current year | (387,197)us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1 | (318,006)us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1 | (322,836)us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1
Prior years | (1,544,664)us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1 | (1,373,459)us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1 | (1,299,384)us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1
Net paid losses and loss expenses | (1,931,861)us-gaap_PaymentsForLossesAndLossAdjustmentExpense | (1,691,465)us-gaap_PaymentsForLossesAndLossAdjustmentExpense | (1,622,220)us-gaap_PaymentsForLossesAndLossAdjustmentExpense
Foreign exchange and other | (230,372)axs_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseForeignExchangeAndOther | 6,184 axs_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseForeignExchangeAndOther | 71,084 axs_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseForeignExchangeAndOther
Net reserve for unpaid losses and loss expenses, end of year | 7,706,517 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet | 7,682,028 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet | 7,233,114 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet
Reinsurance recoverable on unpaid losses, end of year | 1,890,280 us-gaap_ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments | 1,900,112 us-gaap_ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments | 1,825,617 us-gaap_ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments
Gross reserve for losses and loss expenses, end of year | $ 9,596,797 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense | $ 9,582,140 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense | $ 9,058,731 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense

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- Definition The effect of exchange rate changes on foreign-denominated balances needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date. The balance may include other non-material items. + References No definition available. + Details
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- Definition The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a),(b),(c) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 + Details
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- Definition Amount of payments to settle claims incurred in the current period and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 + Details
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- Definition Amount of payments to settle claims incurred in prior periods and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 + Details
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- Definition Amount of expense for claims incurred and costs incurred in the claim settlement process. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 + Details
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- Definition Liability as of the balance sheet date for amounts representing estimated cost of settling unpaid claims under the terms of the underlying insurance policies, less estimated reinsurance recoveries on such claims. This includes an estimate for claims which have been incurred but not reported. Claim adjustment expenses represent the costs estimated to be incurred in the settlement of unpaid claims. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Financial Reporting Release (FRR) -Number 403 -Paragraph 04 -Subparagraph b Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Subparagraph a -Article 7 + Details
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- Definition Amount of payments to settle insured claims and pay costs incurred in the claims settlement process. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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- Definition Amount after valuation allowance recoverable under reinsurance contracts for claims and claims adjustments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 + Details
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- Definition Amount of expense for claims incurred in the current reporting period and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e575016-122915 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 18 -Article 12 + Details
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- Definition Amount of expense for claims incurred in prior reporting periods and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e575016-122915 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 18 -Article 12 + Details
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