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Schedule IV - Reinsurance (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]      
Direct Amount $ 12,904,893 $ 11,676,743 $ 10,695,138
Ceded to Other Companies 2,238,995 2,017,539 1,904,982
Assumed from Other Companies 1,306,198 1,295,263 1,213,914
Total net premiums written $ 11,972,096 $ 10,954,467 $ 10,004,070
Percentage of Amount Assumed to Net 10.90% 11.80% 12.10%
Insurance      
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]      
Direct Amount $ 12,417,129 $ 11,209,325 $ 10,193,154
Ceded to Other Companies 2,112,582 1,900,560 1,796,845
Assumed from Other Companies 245,003 251,768 212,719
Total net premiums written $ 10,549,550 $ 9,560,533 $ 8,609,028
Percentage of Amount Assumed to Net 2.30% 2.60% 2.50%
Reinsurance & Monoline Excess      
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]      
Direct Amount $ 487,764 $ 467,418 $ 501,984
Ceded to Other Companies 126,413 116,979 108,137
Assumed from Other Companies 1,061,195 1,043,495 1,001,195
Total net premiums written $ 1,422,546 $ 1,393,934 $ 1,395,042
Percentage of Amount Assumed to Net 74.60% 74.90% 71.80%