v3.26.1
Reserve for Losses and Loss Adjustment Expenses - Schedule of Reconciliation of Unpaid Losses and Loss Adjustment Expenses (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]        
Gross unpaid losses and loss adjustment expenses, beginning of period     $ 4,415,176 $ 3,532,491
Reinsurance recoverable on unpaid losses     1,375,857 1,171,040
Net unpaid losses and loss adjustment expenses, beginning of period     3,039,319 2,361,451
Net losses and loss adjustment expenses incurred in respect of losses occurring in:        
Current year     668,998 699,855
Prior years     17,276 (34,692)
Total incurred $ 361,489 $ 269,928 686,274 665,163
Net losses and loss adjustment expenses paid in respect of losses occurring in:        
Current year     12,772 104,341
Prior years     384,611 223,599
Total paid     397,383 327,940
Foreign currency revaluation and other     (9,052) 48,947
Net unpaid losses and loss adjustment expenses, end of period 3,319,158 2,747,621 3,319,158 2,747,621
Reinsurance recoverable on unpaid losses 1,463,936 1,236,660 1,463,936 1,236,660
Gross unpaid losses and loss adjustment expenses, end of period $ 4,783,094 $ 3,984,281 $ 4,783,094 $ 3,984,281