| SEGMENT INFORMATION [Text Block] |
3. SEGMENT INFORMATION Our underwriting operations are organized around our global underwriting platforms, AXIS Insurance and AXIS Re. Therefore we have determined that we have two reportable segments, insurance and reinsurance. Except for goodwill and intangible assets, we do not allocate our assets by segment as we evaluate the underwriting results of each segment separately from the results of our investment portfolio. Insurance Our insurance segment provides insurance coverage on a worldwide basis. The product lines in this segment are property, marine, terrorism, aviation, credit and political risk, professional lines, liability and accident & health. Reinsurance Our reinsurance segment provides treaty and facultative property and casualty reinsurance to insurance companies on a worldwide basis. The product lines in this segment are catastrophe, property, professional lines, credit and bond, motor, liability, engineering and other. | The following tables summarize the underwriting results of our reportable segments, as well as the carrying values of allocated goodwill and intangible assets: | | | | | | | | | | | | | | | | | | | | | | | At and year ended December 31, 2011 | | Insurance | | Reinsurance | | Total | | | | | | | | | | | | | | | | | | | Gross premiums written | $ | 2,121,829 | | $ | 1,974,324 | | $ | 4,096,153 | | | | Net premiums written | | 1,466,134 | | | 1,953,300 | | | 3,419,434 | | | | Net premiums earned | | 1,429,687 | | | 1,885,274 | | | 3,314,961 | | | | Other insurance related income | | 2,396 | | | - | | | 2,396 | | | | Net losses and loss expenses | | (919,319) | | | (1,755,733) | | | (2,675,052) | | | | Acquisition costs | | (199,583) | | | (387,886) | | | (587,469) | | | | General and administrative expenses | | (278,147) | | | (103,915) | | | (382,062) | | | | Underwriting income (loss) | $ | 35,034 | | $ | (362,260) | | | (327,226) | | | | | | | | | | | | | | | | | | | Corporate expenses | | | | | | | | | | (77,089) | | | | Net investment income | | | | | | | | | | 362,430 | | | | Net realized investment gains | | | | | | | | | | 121,439 | | | | Foreign exchange gains | | | | | | | | | | 44,582 | | | | Interest expense and financing costs | | | | | | | | | | (62,598) | | | | Income before income taxes | | | | | | | | | $ | 61,538 | | | | | | | | | | | | | | | | | | | Net loss and loss expense ratio | | 64.3 | % | | | 93.1 | % | | | 80.7 | % | | | | Acquisition cost ratio | | 14.0 | % | | | 20.6 | % | | | 17.7 | % | | | | General and administrative expense ratio | | 19.4 | % | | | 5.5 | % | | | 13.9 | % | | | | Combined ratio | | 97.7 | % | | | 119.2 | % | | | 112.3 | % | | | | | | | | | | | | | | | | | | | Goodwill and intangible assets | $ | 99,590 | | $ | - | | $ | 99,590 | | | | | | | | | | | | | | | | |
| | | | | | | At and year ended December 31, 2010 | | Insurance | | Reinsurance | | Total | | | | | | | | | | | | | | | | | | | Gross premiums written | $ | 1,916,116 | | $ | 1,834,420 | | $ | 3,750,536 | | | | Net premiums written | | 1,332,220 | | | 1,815,320 | | | 3,147,540 | | | | Net premiums earned | | 1,206,493 | | | 1,740,917 | | | 2,947,410 | | | | Other insurance related income | | 2,073 | | | - | | | 2,073 | | | | Net losses and loss expenses | | (569,869) | | | (1,107,263) | | | (1,677,132) | | | | Acquisition costs | | (152,223) | | | (336,489) | | | (488,712) | | | | General and administrative expenses | | (276,435) | | | (98,001) | | | (374,436) | | | | Underwriting income | $ | 210,039 | | $ | 199,164 | | | 409,203 | | | | | | | | | | | | | | | | | | | Corporate expenses | | | | | | | | | | (75,449) | | | | Net investment income | | | | | | | | | | 406,892 | | | | Net realized investment gains | | | | | | | | | | 195,098 | | | | Foreign exchange gains | | | | | | | | | | 15,535 | | | | Interest expense and financing costs | | | | | | | | | | (55,876) | | | | Income before income taxes | | | | | | | | | $ | 895,403 | | | | | | | | | | | | | | | | | | | Net loss and loss expense ratio | | 47.2 | % | | | 63.6 | % | | | 56.9 | % | | | | Acquisition cost ratio | | 12.6 | % | | | 19.3 | % | | | 16.6 | % | | | | General and administrative expense ratio | | 23.0 | % | | | 5.7 | % | | | 15.2 | % | | | | Combined ratio | | 82.8 | % | | | 88.6 | % | | | 88.7 | % | | | | | | | | | | | | | | | | | | | Goodwill and intangible assets | $ | 103,231 | | $ | - | | $ | 103,231 | | | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | At and year ended December 31, 2009 | | Insurance | | Reinsurance | | Total | | | | | | | | | | | | | | | | | | | Gross premiums written | $ | 1,775,590 | | $ | 1,811,705 | | $ | 3,587,295 | | | | Net premiums written | | 1,025,061 | | | 1,791,368 | | | 2,816,429 | | | | Net premiums earned | | 1,157,966 | | | 1,633,798 | | | 2,791,764 | | | | Other insurance related income (loss) | | (130,946) | | | 1,265 | | | (129,681) | | | | Net losses and loss expenses | | (612,694) | | | (811,178) | | | (1,423,872) | | | | Acquisition costs | | (113,187) | | | (307,308) | | | (420,495) | | | | General and administrative expenses | | (216,954) | | | (76,127) | | | (293,081) | | | | Underwriting income | $ | 84,185 | | $ | 440,450 | | | 524,635 | | | | | | | | | | | | | | | | | | | Corporate expenses | | | | | | | | | | (77,076) | | | | Net investment income | | | | | | | | | | 464,478 | | | | Net realized investment losses | | | | | | | | | | (311,584) | | | | Foreign exchange losses | | | | | | | | | | (28,561) | | | | Interest expense and financing costs | | | | | | | | | | (32,031) | | | | Income before income taxes | | | | | | | | | $ | 539,861 | | | | | | | | | | | | | | | | | | | Net loss and loss expense ratio | | 52.9 | % | | | 49.6 | % | | | 51.0 | % | | | | Acquisition cost ratio | | 9.8 | % | | | 18.8 | % | | | 15.1 | % | | | | General and administrative expense ratio | | 18.7 | % | | | 4.7 | % | | | 13.2 | % | | | | Combined ratio | | 81.4 | % | | | 73.1 | % | | | 79.3 | % | | | | | | | | | | | | | | | | | | | Goodwill and intangible assets | $ | 91,505 | | $ | - | | $ | 91,505 | | | | | | | | | | | | | | | | |
| The following table presents our gross premiums written by the geographical location of our subsidiaries: | | | | | | | | | | | | | | | | | | | | | | | Year ended December 31, | | | 2011 | | | 2010 | | | 2009 | | | | | | | | | | | | | | | | | Bermuda | | $ | 822,237 | | $ | 822,530 | | $ | 802,577 | | | | Europe | | | 1,493,692 | | | 1,203,091 | | | 1,057,427 | | | | United States | | | 1,780,224 | | | 1,724,915 | | | 1,727,291 | | | | Total gross premium written | | $ | 4,096,153 | | $ | 3,750,536 | | $ | 3,587,295 | | | | | | | | | | | | | | |
| The following table presents our net premiums earned by segment and line of business: | | | | | | | | | | | | | | | | | | | | | | | | | | | Year ended December 31, | 2011 | | 2010 | | 2009 | | | | | | | | | | | | | | | | Insurance | | | | | | | | | | | | Property | $ | 385,291 | | $ | 337,525 | | $ | 268,469 | | | | Marine | | 152,123 | | | 145,356 | | | 139,196 | | | | Terrorism | | 35,213 | | | 32,486 | | | 34,001 | | | | Aviation | | 70,681 | | | 66,636 | | | 64,245 | | | | Credit and political risk | | 97,680 | | | 89,773 | | | 188,311 | | | | Professional lines | | 536,238 | | | 444,663 | | | 381,364 | | | | Liability | | 89,555 | | | 87,481 | | | 82,380 | | | | Accident & health | | 62,906 | | | 2,573 | | | - | | | | Total Insurance | | 1,429,687 | | | 1,206,493 | | | 1,157,966 | | | | | | | | | | | | | | | | Reinsurance | | | | | | | | | | | | Catastrophe | | 456,858 | | | 454,954 | | | 451,085 | | | | Property | | 356,022 | | | 323,201 | | | 311,272 | | | | Professional lines | | 281,025 | | | 285,224 | | | 266,792 | | | | Credit and bond | | 263,912 | | | 217,809 | | | 179,362 | | | | Motor | | 202,830 | | | 127,404 | | | 99,497 | | | | Liability | | 230,872 | | | 232,014 | | | 227,511 | | | | Engineering | | 65,727 | | | 71,229 | | | 66,428 | | | | Other | | 28,028 | | | 29,082 | | | 31,851 | | | | Total Reinsurance | | 1,885,274 | | | 1,740,917 | | | 1,633,798 | | | | | | | | | | | | | | | | Total | $ | 3,314,961 | | $ | 2,947,410 | | $ | 2,791,764 | | | | | | | | | | | | | |
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