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Business Segments (Tables) | 6 Months Ended
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Jun. 30, 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 June 30, 2024 |  |  |  |  |  |  |  |  |  |
Insurance | $ | 2,484,569 |  |  | $ | 303,561 |  |  | $ | 9,591 |  |  | $ | 2,797,721 |  |  | $ | 490,053 |  |  | $ | 374,247 |
Reinsurance & Monoline Excess | 361,846 |  |  | 58,472 |  |  | — |  |  | 420,318 |  |  | 124,449 |  |  | 97,638 |
Corporate, other and eliminations (3) | — |  |  | 10,096 |  |  | 144,409 |  |  | 154,505 |  |  | (68,317) |  |  | (53,865) |
Net investment losses | — |  |  | — |  |  | (58,512) |  |  | (58,512) |  |  | (58,512) |  |  | (46,111) |
Total | $ | 2,846,415 |  |  | $ | 372,129 |  |  | $ | 95,488 |  |  | $ | 3,314,032 |  |  | $ | 487,673 |  |  | $ | 371,909 |
Three months ended June 30, 2023 |  |  |  |  |  |  |  |  |  |
Insurance | $ | 2,215,186 |  |  | $ | 185,327 |  |  | $ | 8,853 |  |  | $ | 2,409,366 |  |  | $ | 386,350 |  |  | $ | 300,239 |
Reinsurance & Monoline Excess | 337,541 |  |  | 42,187 |  |  | — |  |  | 379,728 |  |  | 105,420 |  |  | 82,317 |
Corporate, other and eliminations (3) | — |  |  | 17,638 |  |  | 130,528 |  |  | 148,166 |  |  | (93,240) |  |  | (72,315) |
Net investment gains | — |  |  | — |  |  | 58,654 |  |  | 58,654 |  |  | 58,654 |  |  | 46,067 |
Total | $ | 2,552,727 |  |  | $ | 245,152 |  |  | $ | 198,035 |  |  | $ | 2,995,914 |  |  | $ | 457,184 |  |  | $ | 356,308 |
Six months ended June 30, 2024 |  |  |  |  |  |  |  |  |  |
Insurance | $ | 4,883,338 |  |  | $ | 548,338 |  |  | $ | 19,014 |  |  | $ | 5,450,690 |  |  | $ | 968,202 |  |  | $ | 739,337 |
Reinsurance & Monoline Excess | 727,424 |  |  | 111,683 |  |  | — |  |  | 839,107 |  |  | 252,074 |  |  | 199,764 |
Corporate, other and eliminations (3) | — |  |  | 31,946 |  |  | 281,795 |  |  | 313,741 |  |  | (125,799) |  |  | (97,757) |
Net investment losses | — |  |  | — |  |  | (32,733) |  |  | (32,733) |  |  | (32,733) |  |  | (26,964) |
Total | $ | 5,610,762 |  |  | $ | 691,967 |  |  | $ | 268,076 |  |  | $ | 6,570,805 |  |  | $ | 1,061,744 |  |  | $ | 814,380 |
Six Months Ended June 30, 2023 |  |  |  |  |  |  |  |  |  |
Insurance | $ | 4,358,110 |  |  | $ | 348,886 |  |  | $ | 18,427 |  |  | $ | 4,725,423 |  |  | $ | 738,977 |  |  | $ | 574,347 |
Reinsurance & Monoline Excess | 686,049 |  |  | 96,770 |  |  | — |  |  | 782,819 |  |  | 206,704 |  |  | 164,674 |
Corporate, other and eliminations (3) | — |  |  | 22,895 |  |  | 278,117 |  |  | 301,012 |  |  | (194,089) |  |  | (152,814) |
Net investment gains | — |  |  | — |  |  | 81,664 |  |  | 81,664 |  |  | 81,664 |  |  | 64,227 |
Total | $ | 5,044,159 |  |  | $ | 468,551 |  |  | $ | 378,208 |  |  | $ | 5,890,918 |  |  | $ | 833,256 |  |  | $ | 650,434 |
_________________ (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 June 30, 2024 and 2023 were $368 million and $280 million, respectively, and for the six months ended June 30, 2024 and 2023 were $762 million and $554 million, respectively. Revenues for Reinsurance & Monoline Excess from foreign operations for the three months ended June 30, 2024 and 2023 were $117 million and $102 million, respectively, and for the six months ended June 30, 2024 and 2023 were $228 million and $209 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) | June 30, 2024 |  | December 31, 2023 |
Insurance | $ | 31,264,338 |  |  | $ | 29,923,282 |  |
Reinsurance & Monoline Excess | 5,557,232 |  |  | 5,545,249 |  |
Corporate, other and eliminations | 2,088,349 |  |  | 1,643,299 |  |
Consolidated | $ | 38,909,919 |  |  | $ | 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 June 30, |  | For the Six Months Ended June 30,
(In thousands) | 2024 |  | 2023 |  | 2024 |  | 2023
Insurance: |  |  |  |  |  |  |
Other liability | $ | 1,001,987 |  |  | $ | 890,984 |  |  | $ | 1,969,247 |  |  | $ | 1,744,456 |
Short-tail lines (1) | 538,797 |  |  | 444,834 |  |  | 1,049,606 |  |  | 857,368 |
Auto | 361,580 |  |  | 307,578 |  |  | 715,593 |  |  | 601,694 |
Workers' compensation | 310,564 |  |  | 299,149 |  |  | 612,060 |  |  | 604,710 |
Professional liability | 271,641 |  |  | 272,641 |  |  | 536,832 |  |  | 549,882 |
Total Insurance | 2,484,569 |  |  | 2,215,186 |  |  | 4,883,338 |  |  | 4,358,110 |
Reinsurance & Monoline Excess: |  |  |  |  |  |  |
Casualty (2) | 199,080 |  |  | 202,348 |  |  | 396,924 |  |  | 417,060 |
Property (2) | 97,255 |  |  | 76,348 |  |  | 199,638 |  |  | 151,500 |
Monoline excess (3) | 65,511 |  |  | 58,845 |  |  | 130,862 |  |  | 117,489 |
Total Reinsurance & Monoline Excess | 361,846 |  |  | 337,541 |  |  | 727,424 |  |  | 686,049 |
Total | $ | 2,846,415 |  |  | $ | 2,552,727 |  |  | $ | 5,610,762 |  |  | $ | 5,044,159 |
______________ (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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