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Reinsurance (List of direct, assumed and ceded Reinsurance Amounts) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Premiums Written: |  |  |
Direct premiums written | $ 4,725,459 | $ 4,068,518 | $ 3,656,537
Assumed | 23,999 | 32,320 | 22,664
Ceded premiums written | (614,926) | (527,248) | (489,488)
Net | 4,134,532 | 3,573,590 | 3,189,713
Premiums Earned: |  |  |
Direct | 4,386,556 | 3,880,522 | 3,472,715
Assumed | 25,027 | 30,742 | 21,550
Ceded premiums earned | (583,977) | (537,884) | (477,012)
Total net premiums earned | 3,827,606 | 3,373,380 | 3,017,253
Loss and loss expense incurred: |  |  |
Direct | 2,738,301 | 2,537,638 | 2,096,512
Assumed | 19,581 | 23,160 | 13,813
Ceded loss and loss expense | (273,597) | (449,020) | (296,341)
Net | $ 2,484,285 | $ 2,111,778 | $ 1,813,984

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