Reserves for Unpaid Losses and Loss Adjustment Expenses Narrative (Details) - USD ($) $ in Thousands |
9 Months Ended | |
|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| Claims Development [Line Items] | ||
| Adverse (Favorable) development on prior year loss reserves | $ (57,763) | $ (45,853) |
| Current year | 755,883 | 723,350 |
| Catastrophe losses [Member] | ||
| Claims Development [Line Items] | ||
| Current year | 27,500 | |
| Short Duration Insurance Contract Accident Years 2021 through 2025 | ||
| Claims Development [Line Items] | ||
| Adverse (Favorable) development on prior year loss reserves | $ (66,300) | |
| Short Duration Insurance Contract Accident Years 2020 through 2024 | ||
| Claims Development [Line Items] | ||
| Adverse (Favorable) development on prior year loss reserves | $ (53,800) | |