Reinsurance (Effect Of Reinsurance And Retrocessional Reinsurance On Losses) (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| Effects of Reinsurance [Line Items] | ||||
| Net losses and loss adjustment expenses | $ 1,275,605 | $ 1,253,826 | $ 3,629,573 | $ 3,796,525 |
| Underwriting | ||||
| Effects of Reinsurance [Line Items] | ||||
| Gross losses and loss adjustment expenses | 1,559,875 | 1,566,985 | 4,880,804 | 4,900,250 |
| Ceded losses and loss adjustment expenses | (283,906) | (313,061) | (1,250,819) | (1,103,552) |
| Net losses and loss adjustment expenses | $ 1,275,969 | $ 1,253,924 | $ 3,629,985 | $ 3,796,698 |
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Definition Amount, before effect of policies assumed or ceded, of expense related to provision for policy benefits and costs incurred. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
| X | ||||||||||
- Definition Amount, after effects of policies assumed or ceded, of expense related to the provision for policy benefits and costs incurred. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
| X | ||||||||||
- Definition Amount of reduction of provision for policy benefits and costs incurred for policies ceded. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Details
|