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Business Segments (Tables) | 3 Months Ended
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Mar. 31, 2024
Segment Reporting [Abstract] |
Financial Information Of Company Operating Segments |
| Revenues |  |  |  |
(In thousands) | Earned Premiums (1) |  | Investment Income |  | Other |  | Total (2) |  | Pre-Tax Income (Loss) |  | Net Income (Loss) to Common Stockholders
Three months ended March 31, 2024 |  |  |  |  |  |  |  |  |  |
Insurance | $ | 2,398,768 |  |  | $ | 244,778 |  |  | $ | 9,423 |  |  | $ | 2,652,969 |  |  | $ | 478,149 |  |  | $ | 365,091 |
Reinsurance & Monoline Excess | 365,579 |  |  | 53,211 |  |  | — |  |  | 418,790 |  |  | 127,624 |  |  | 102,126 |
Corporate, other and eliminations (3) | — |  |  | 21,850 |  |  | 137,384 |  |  | 159,234 |  |  | (57,482) |  |  | (43,893) |
Net investment gains | — |  |  | — |  |  | 25,780 |  |  | 25,780 |  |  | 25,780 |  |  | 19,147 |
Total | $ | 2,764,347 |  |  | $ | 319,839 |  |  | $ | 172,587 |  |  | $ | 3,256,773 |  |  | $ | 574,071 |  |  | $ | 442,471 |
Three months ended March 31, 2023 |  |  |  |  |  |  |  |  |  |
Insurance | $ | 2,142,924 |  |  | $ | 163,558 |  |  | $ | 9,577 |  |  | $ | 2,316,059 |  |  | $ | 352,626 |  |  | $ | 274,108 |
Reinsurance & Monoline Excess | 348,508 |  |  | 54,583 |  |  | — |  |  | 403,091 |  |  | 101,285 |  |  | 82,357 |
Corporate, other and eliminations (3) | — |  |  | 5,257 |  |  | 147,587 |  |  | 152,844 |  |  | (100,850) |  |  | (80,499) |
Net investment gains | — |  |  | — |  |  | 23,010 |  |  | 23,010 |  |  | 23,010 |  |  | 18,160 |
Total | $ | 2,491,432 |  |  | $ | 223,398 |  |  | $ | 180,174 |  |  | $ | 2,895,004 |  |  | $ | 376,071 |  |  | $ | 294,126 |
_________________ (1) Certain amounts included in earned premiums of each segment are related to inter-segment transactions. (2) Revenues for Insurance from foreign operations for the three months ended March 31, 2024 and 2023 were $393 million and $274 million, respectively. Revenues for Reinsurance & Monoline Excess from foreign operations for the three months ended March 31, 2024 and 2023 were $111 million and $106 million, respectively. (3) Corporate, other and eliminations represent corporate revenues and expenses that are not allocated to business segments
Identifiable Assets By Segment |
(In thousands) | March 31, 2024 |  | December 31, 2023 |
Insurance | $ | 30,048,006 |  |  | $ | 29,923,282 |  |
Reinsurance & Monoline Excess | 5,506,533 |  |  | 5,545,249 |  |
Corporate, other and eliminations | 2,296,533 |  |  | 1,643,299 |  |
Consolidated | $ | 37,851,072 |  |  | $ | 37,111,830 |  |
Net Premiums Earned By Major Line Of Business | Net premiums earned by major line of business are as follows:
| For the Three Months Ended March 31, |  |
(In thousands) | 2024 |  | 2023 |  |  |  |
Insurance: |  |  |  |  |  |  |
Other liability | $ | 967,260 |  |  | $ | 853,472 |  |  |  |  |
Short-tail lines (1) | 510,809 |  |  | 412,534 |  |  |  |  |
Auto | 354,013 |  |  | 294,116 |  |  |  |  |
Workers' compensation | 301,495 |  |  | 305,561 |  |  |  |  |
Professional liability | 265,191 |  |  | 277,241 |  |  |  |  |
Total Insurance | 2,398,768 |  |  | 2,142,924 |  |  |  |  |
Reinsurance & Monoline Excess: |  |  |  |  |  |  |
Casualty (2) | 197,844 |  |  | 214,712 |  |  |  |  |
Property (2) | 102,384 |  |  | 75,152 |  |  |  |  |
Monoline excess (3) | 65,351 |  |  | 58,644 |  |  |  |  |
Total Reinsurance & Monoline Excess | 365,579 |  |  | 348,508 |  |  |  |  |
Total | $ | 2,764,347 |  |  | $ | 2,491,432 |  |  |  |  |
______________ (1) Short-tail lines include commercial multi-peril (non-liability), inland marine, accident and health, fidelity and surety, boiler and machinery, high net worth homeowners and other lines. (2) Includes reinsurance casualty and property and certain program management business. (3) Monoline excess includes operations that solely retain risk on an excess basis.

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