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SCHEDULE III - SUPPLEMENTARY INSURANCE INFORMATION (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Supplementary Insurance Information [Line Items] |  |  |
Deferred acquisition costs | $ 473,569 | $ 465,593 | $ 431,439
Reserve for losses and loss expenses | 15,168,863 | 14,653,094 | 13,926,766
Unearned premiums | 4,361,447 | 4,090,676 | 3,685,886
Net premiums earned | 5,160,326 | 4,709,850 | 4,371,309
Net investment income | 418,829 | 454,301 | 349,601
Net losses and loss expenses | 3,242,410 | 3,008,783 | 3,281,252
Acquisition costs | 1,022,017 | 921,834 | 929,517
Other operating expenses | 680,343 | 663,304 | 579,790
Net premiums written | 5,263,056 | 4,926,624 | 4,336,409
General and administrative expenses | 680,343 | 663,304 | 579,790
Operating Segments |  |  |
Supplementary Insurance Information [Line Items] |  |  |
General and administrative expenses | 550,289 | 536,834 | 477,968
Operating Segments | Insurance |  |  |
Supplementary Insurance Information [Line Items] |  |  |
Deferred acquisition costs | 249,407 | 212,681 | 176,749
Reserve for losses and loss expenses | 8,381,593 | 7,803,529 | 7,310,498
Unearned premiums | 3,077,628 | 2,716,240 | 2,295,763
Net premiums earned | 3,134,155 | 2,651,339 | 2,299,038
Net investment income | 0 | 0 | 0
Net losses and loss expenses | 1,785,854 | 1,514,998 | 1,697,014
Acquisition costs | 577,838 | 484,344 | 461,533
Other operating expenses | 443,704 | 429,282 | 378,839
Net premiums written | 3,377,906 | 2,894,885 | 2,357,501
General and administrative expenses | 443,704 | 429,282 | 378,839
Operating Segments | Reinsurance |  |  |
Supplementary Insurance Information [Line Items] |  |  |
Deferred acquisition costs | 224,162 | 252,912 | 254,690
Reserve for losses and loss expenses | 6,787,270 | 6,849,565 | 6,616,268
Unearned premiums | 1,283,819 | 1,374,436 | 1,390,123
Net premiums earned | 2,026,171 | 2,058,511 | 2,072,271
Net investment income | 0 | 0 | 0
Net losses and loss expenses | 1,456,556 | 1,493,785 | 1,584,238
Acquisition costs | 444,179 | 437,490 | 467,984
Other operating expenses | 106,585 | 107,552 | 99,129
Net premiums written | 1,885,150 | 2,031,739 | 1,978,908
General and administrative expenses | 106,585 | 107,552 | 99,129
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 | 418,829 | 454,301 | 349,601
Net losses and loss expenses | 0 | 0 | 0
Acquisition costs | 0 | 0 | 0
Other operating expenses | 130,054 | 126,470 | 101,822
Net premiums written | 0 | 0 | 0
General and administrative expenses | $ 130,054 | $ 126,470 | $ 101,822

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