v3.25.2
Reserves for Losses and Loss Settlement Expenses - Changes in Property and Casualty Losses and Loss Settlement Expense Reserves (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2025
Jun. 30, 2025
Dec. 31, 2024
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]      
Gross liability for losses and loss settlement expenses at beginning of year   $ 1,796,782 $ 1,638,755
Ceded losses and loss settlement expenses   (198,083) (191,640)
Net liability for losses and loss settlement expenses at beginning of year   1,598,699 1,447,115
Losses and loss settlement expenses incurred for claims occurring during      
Current year   395,308 745,813
Prior years $ (9,000) (11,880) (1,208)
Total incurred   383,428 744,605
Losses and loss settlement expense payments for claims occurring during      
Current year   79,271 186,322
Prior years   248,988 406,699
Total paid   328,259 593,021
Net liability for losses and loss settlement expenses at end of period 1,653,868 1,653,868 1,598,699
Ceded losses and loss settlement expenses 206,263 206,263 198,083
Gross liability for losses and loss settlement expenses at end of period $ 1,860,131 $ 1,860,131 $ 1,796,782