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Supplemental Reinsurance Premiums (Schedule of Property and Liability Insurance Earned Premiums) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Abstract]
Direct amounts	$ 5,196,699	$ 4,368,342	$ 4,022,611
Ceded to other companies	(136,698)	(109,445)	(80,950)
Assumed	15,455	15,481	10,821
Net premiums earned	$ 5,075,456	$ 4,274,378	$ 3,952,482

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