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Reinsurance (Reinsurance Financial Information) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Reinsurance Disclosures [Abstract]      
Written premiums, Direct $ 12,904,893 $ 11,676,743 $ 10,695,138
Written premiums, Assumed 1,306,198 1,295,263 1,213,914
Written premiums, Ceded (2,238,995) (2,017,539) (1,904,982)
Total net premiums written 11,972,096 10,954,467 10,004,070
Earned premiums, Direct 12,346,924 11,112,980 10,217,891
Earned premiums, Assumed 1,364,774 1,246,288 1,226,801
Earned premiums, Ceded (2,163,213) (1,958,581) (1,883,263)
Net premiums earned 11,548,485 10,400,687 9,561,429
Ceded losses and loss expenses incurred 1,368,279 1,376,144 1,269,338
Ceded commission earned 505,753 471,841 477,437
Uncollectible reinsurance $ 8,350 $ 8,404 $ 8,064