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SHAREHOLDERS' EQUITY (DETAILS) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued, balance at beginning of period			175,478us-gaap_CommonStockSharesIssued
Total shares issued at end of period	176,190us-gaap_CommonStockSharesIssued		175,478us-gaap_CommonStockSharesIssued
Treasury shares, balance at beginning of period			(76,052)us-gaap_TreasuryStockShares
Total treasury shares at end of period	(75,971)us-gaap_TreasuryStockShares		(76,052)us-gaap_TreasuryStockShares
Total shares outstanding	100,219us-gaap_CommonStockSharesOutstanding		99,426us-gaap_CommonStockSharesOutstanding
Common Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued, balance at beginning of period	175,478us-gaap_CommonStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember	174,134us-gaap_CommonStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember
Shares issued	712us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember	1,061us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember
Total shares issued at end of period	176,190us-gaap_CommonStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember	175,195us-gaap_CommonStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember
Treasury shares, balance at beginning of period	(76,052)us-gaap_TreasuryStockShares / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember	(64,649)us-gaap_TreasuryStockShares / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember
Shares repurchased	(290)us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember	(4,036)us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember
Shares reissued from treasury	371axs_StockIssuedDuringPeriodSharesTreasuryStockReissuedIncludingToSatisfyEquityBasedCompensationObligations / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember	235axs_StockIssuedDuringPeriodSharesTreasuryStockReissuedIncludingToSatisfyEquityBasedCompensationObligations / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember
Total treasury shares at end of period	(75,971)us-gaap_TreasuryStockShares / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember	(68,450)us-gaap_TreasuryStockShares / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember
Total shares outstanding	100,219us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember	106,745us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember

X

- Definition

Number of treasury shares (units) reissued during the period. Upon reissuance of shares (units) from treasury, either the common or preferred stock (unit) reissued is outstanding.

+ References

No definition available.

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- Definition

Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.29)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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-Number 210

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X

- Definition

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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- Definition

Number of new stock issued during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Topic 505

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- Definition

Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

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- Definition

Number of shares that have been repurchased during the period and are being held in treasury.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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