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Reinsurance - Schedule of Direct, Assumed, and Ceded Reinsurance Amounts (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Premiums written: |  |  |  |
Direct | $ 1,335,475 | $ 1,214,444 | $ 4,051,124 | $ 3,579,700
Assumed | 7,611 | 9,087 | 20,009 | 20,058
Ceded | (185,446) | (165,206) | (530,771) | (456,758)
Net | 1,157,640 | 1,058,325 | 3,540,362 | 3,143,000
Premiums earned: |  |  |  |
Direct | 1,279,783 | 1,123,444 | 3,727,847 | 3,229,170
Assumed | 6,972 | 8,916 | 18,942 | 21,174
Ceded | (174,527) | (150,443) | (503,386) | (423,941)
Net | 1,112,228 | 981,917 | 3,243,403 | 2,826,403
Loss and loss expense incurred: |  |  |  |
Direct | 1,194,224 | 741,288 | 2,957,610 | 2,053,511
Assumed | 6,104 | 8,182 | 17,143 | 19,115
Ceded | (434,670) | (103,573) | (579,255) | (213,161)
Net | $ 765,658 | $ 645,897 | $ 2,395,498 | $ 1,859,465

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