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Supplemental Reinsurance Premiums (Schedule of Property and Liability Insurance Earned Premiums) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Abstract] |  |  |
Direct amounts | $ 4,368,342 | $ 4,022,611 | $ 3,793,664
Ceded to other companies | (109,445) | (80,950) | (65,017)
Assumed | 15,481 | 10,821 | 13,301
Net premiums earned | $ 4,274,378 | $ 3,952,482 | $ 3,741,948

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