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Premiums and Reinsurance Related Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Written premiums:        
Written premiums, direct $ 3,380,470 $ 2,985,563 $ 6,419,537 $ 5,724,317
Written premiums, assumed 337,302 351,210 660,991 661,773
Written premiums, ceded (590,993) (525,258) (1,102,458) (999,751)
Total net premiums written 3,126,779 2,811,515 5,978,070 5,386,339
Earned premiums:        
Earned premiums, direct 3,048,872 2,725,650 5,985,516 5,392,712
Earned premiums, assumed 328,114 302,431 666,024 597,661
Earned premiums, ceded (530,571) (475,354) (1,040,778) (946,214)
Net premiums earned 2,846,415 2,552,727 5,610,762 5,044,159
Ceded losses and loss expenses incurred 327,243 333,795 633,194 649,271
Ceded commissions earned $ 123,647 $ 117,523 $ 244,701 $ 235,941