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Premiums and Reinsurance Related Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Written premiums:        
Written premiums, direct $ 3,483,768 $ 3,303,682 $ 10,405,445 $ 9,723,219
Written premiums, assumed 352,488 329,596 1,092,519 990,587
Written premiums, ceded (609,326) (576,002) (1,786,292) (1,678,460)
Total net premiums written 3,226,930 3,057,276 9,711,672 9,035,346
Earned premiums:        
Earned premiums, direct 3,401,897 3,141,883 9,970,992 9,127,399
Earned premiums, assumed 352,745 346,780 1,028,862 1,012,804
Earned premiums, ceded (598,260) (561,840) (1,732,906) (1,602,618)
Earned premiums 3,156,382 2,926,823 9,266,948 8,537,585
Ceded losses and loss expenses incurred 286,799 319,472 955,974 952,666
Ceded commissions earned $ 138,091 $ 129,916 $ 413,614 $ 374,618