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Reinsurance - List of Direct, Assumed, and Ceded Reinsurance Amounts (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Premiums written: |  |
Direct | $ 1,315,911 | $ 1,132,760
Assumed | 5,985 | 5,394
Ceded | (165,275) | (138,386)
Net | 1,156,621 | 999,768
Premiums earned: |  |
Direct | 1,205,368 | 1,032,228
Assumed | 6,191 | 6,290
Ceded | (160,615) | (136,182)
Net | 1,050,944 | 902,336
Loss and loss expense incurred: |  |
Direct | 753,567 | 613,229
Assumed | 5,981 | 5,255
Ceded | (55,256) | (51,046)
Net | $ 704,292 | $ 567,438

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