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Reinsurance - Schedule of Direct, Assumed, and Ceded Reinsurance Amounts (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Premiums written: |  |  |
Direct | $ 5,319,457 | $ 4,725,459 | $ 4,068,518
Assumed | 27,557 | 23,999 | 32,320
Ceded | (717,013) | (614,926) | (527,248)
Net | 4,630,001 | 4,134,532 | 3,573,590
Premiums earned: |  |  |
Direct | 5,034,952 | 4,386,556 | 3,880,522
Assumed | 26,450 | 25,027 | 30,742
Ceded | (684,955) | (583,977) | (537,884)
Net | 4,376,447 | 3,827,606 | 3,373,380
Loss and loss expense incurred: |  |  |
Direct | 3,909,463 | 2,738,301 | 2,537,638
Assumed | 21,540 | 19,581 | 23,160
Ceded | (766,519) | (273,597) | (449,020)
Net | $ 3,164,484 | $ 2,484,285 | $ 2,111,778

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