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SCHEDULE III - SUPPLEMENTARY INSURANCE INFORMATION (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Supplementary Insurance Information [Line Items] |  |  |
Deferred acquisition costs | $ 524,837 | $ 450,950 | $ 473,569
Reserve for losses and loss expenses | 17,218,929 | 16,434,018 | 15,168,863
Unearned premiums | 5,211,865 | 4,747,602 | 4,361,447
Net premiums earned | 5,306,235 | 5,083,781 | 5,160,326
Net investment income | 759,229 | 611,742 | 418,829
Net losses and loss expenses | 3,158,487 | 3,393,102 | 3,242,410
Acquisition costs | 1,070,551 | 1,000,945 | 1,022,017
Other operating expenses | 666,202 | 684,446 | 680,343
Net premiums written | 5,757,351 | 5,102,325 | 5,263,056
Operating Segments | Insurance |  |  |
Supplementary Insurance Information [Line Items] |  |  |
Deferred acquisition costs | 343,476 | 298,249 | 249,407
Reserve for losses and loss expenses | 10,499,703 | 9,507,409 | 8,381,593
Unearned premiums | 3,859,162 | 3,507,519 | 3,077,628
Net premiums earned | 3,926,036 | 3,461,700 | 3,134,155
Net investment income | 0 | 0 | 0
Net losses and loss expenses | 2,245,420 | 2,080,001 | 1,785,854
Acquisition costs | 766,915 | 648,463 | 577,838
Other operating expenses | 485,929 | 472,094 | 443,704
Net premiums written | 4,250,545 | 3,758,720 | 3,377,906
Operating Segments | Reinsurance |  |  |
Supplementary Insurance Information [Line Items] |  |  |
Deferred acquisition costs | 181,361 | 152,701 | 224,162
Reserve for losses and loss expenses | 6,719,226 | 6,926,609 | 6,787,270
Unearned premiums | 1,352,703 | 1,240,083 | 1,283,819
Net premiums earned | 1,380,199 | 1,622,081 | 2,026,171
Net investment income | 0 | 0 | 0
Net losses and loss expenses | 913,067 | 1,313,101 | 1,456,556
Acquisition costs | 303,636 | 352,482 | 444,179
Other operating expenses | 50,513 | 79,373 | 106,585
Net premiums written | 1,506,806 | 1,343,605 | 1,885,150
Corporate |  |  |
Supplementary Insurance Information [Line Items] |  |  |
Deferred acquisition costs | 0 | 0 | 0
Reserve for losses and loss expenses | 0 | 0 | 0
Unearned premiums | 0 | 0 | 0
Net premiums earned | 0 | 0 | 0
Net investment income | 759,229 | 611,742 | 418,829
Net losses and loss expenses | 0 | 0 | 0
Acquisition costs | 0 | 0 | 0
Other operating expenses | 129,760 | 132,979 | 130,054
Net premiums written | $ 0 | $ 0 | $ 0

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