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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, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]        
Gross unpaid losses and loss adjustment expenses, beginning of period     $ 3,030,037 $ 2,856,275
Reinsurance recoverable on unpaid losses     1,161,077 1,177,863
Net unpaid losses and loss adjustment expenses, beginning of period     1,868,960 1,678,412
Net losses and loss adjustment expenses incurred in respect of losses occurring in:        
Current year     726,602 528,457
Prior years     (6,124) (8,903)
Total incurred $ 273,632 $ 191,577 720,478 519,554
Net losses and loss adjustment expenses paid in respect of losses occurring in:        
Current year     24,850 28,521
Prior years     344,992 397,407
Total paid     369,842 425,928
Foreign currency revaluation and other     24,739 19,661
Net unpaid losses and loss adjustment expenses, end of period 2,244,335 1,791,699 2,244,335 1,791,699
Reinsurance recoverable on unpaid losses 1,190,465 1,157,123 1,190,465 1,157,123
Gross unpaid losses and loss adjustment expenses, end of period $ 3,434,800 $ 2,948,822 $ 3,434,800 $ 2,948,822