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UNAUDITED CONDENSED QUARTERLY FINANCIAL DATA (DETAILS) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net premiums earned | $ 921,812 | $ 919,341 | $ 941,211 | $ 904,053 | $ 958,517 | $ 966,138 | $ 1,000,400 | $ 945,949 | $ 3,686,417 | $ 3,870,999 | $ 3,707,065
Net investment income | 79,000 | 45,685 | 88,544 | 92,107 | 78,595 | 66,562 | 114,867 | 82,744 | 305,336 | 342,766 | 409,312
Net realized investment gains (losses) | (14,872) | (69,957) | (11,110) | (42,553) | 10,779 | 77,448 | 33,261 | 10,620 | (138,491) | 132,108 | 75,564
Underwriting income | 88,358 | 56,245 | 56,848 | 100,790 | 112,720 | 113,464 | 126,581 | 108,766 |  |  |
Net income attributable to AXIS Capital | 144,790 | 257,642 | 73,371 | 165,825 | 173,685 | 289,126 | 200,686 | 147,249 | 641,631 | 810,745 | 727,465
Net income available to common shareholders | $ 134,787 | $ 247,620 | $ 63,349 | $ 155,803 | $ 163,663 | $ 279,104 | $ 190,664 | $ 137,227 | $ 601,562 | $ 770,657 | $ 683,910
Basic earnings per common share (in dollars per share) | $ 1.40 | $ 2.52 | $ 0.63 | $ 1.56 | $ 1.63 | $ 2.71 | $ 1.81 | $ 1.26 | $ 6.10 | $ 7.38 | $ 6.02
Diluted earnings per common share (in dollars per share) | $ 1.39 | $ 2.50 | $ 0.63 | $ 1.54 | $ 1.60 | $ 2.68 | $ 1.79 | $ 1.24 | $ 6.04 | $ 7.29 | $ 5.93

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- Definition This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities, the change in fair value of investment-related derivatives not designated as hedges and any hedge ineffectiveness recognized in earnings in relation to investment portfolio-related fair value hedges. + References No definition available. + Details
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- Definition The net gain or loss (both realized and unrealized) related to investments in certain entities that calculate net asset value per share and the amount after accretion (amortization) of discount (premium) of interest income and dividend income on nonoperating securities, net of investment expense. + References No definition available. + Details
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- Definition Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums earned. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.1) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(c)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574992-122915 + Details
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