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Premiums and Reinsurance Related Information (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Written premiums:    
Written premiums, direct $ 3,039,066 $ 2,738,754
Written premiums, assumed 323,689 310,563
Written premiums, ceded (511,464) (474,493)
Total net premiums written 2,851,291 2,574,824
Earned premiums:    
Earned premiums, direct 2,936,643 2,667,063
Earned premiums, assumed 337,911 295,230
Earned premiums, ceded (510,207) (470,861)
Net premiums earned 2,764,347 2,491,432
Ceded losses and loss expenses incurred 305,951 315,476
Ceded commissions earned $ 121,054 $ 118,418