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Reserve for Losses and Loss Adjustment Expenses - Schedule of Reconciliation of Unpaid Losses and Loss Adjustment Expenses (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]        
Gross unpaid losses and loss expenses, beginning of period     $ 2,856,275 $ 2,415,491
Reinsurance recoverable on unpaid losses     1,177,863 1,112,543
Net unpaid losses and loss expenses, beginning of period     1,678,412 1,302,948
Net losses and loss expenses incurred in respect of losses occurring in:        
Current year     528,457 600,536
Prior years     (8,903) (3,522)
Total incurred $ 191,577 $ 257,963 519,554 597,014
Net losses and loss expenses paid in respect of losses occurring in:        
Current year     28,521 18,901
Prior years     397,407 236,661
Total paid     425,928 255,562
Foreign currency revaluation and other     19,661 (39,331)
Net unpaid losses and loss expenses, end of period 1,791,699 1,605,069 1,791,699 1,605,069
Reinsurance recoverable on unpaid losses 1,157,123 1,151,128 1,157,123 1,151,128
Gross unpaid losses and loss expenses, end of period $ 2,948,822 $ 2,756,197 $ 2,948,822 $ 2,756,197