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Net realized and unrealized gains (Tables) | 9 Months Ended
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Sep. 30, 2025
Investments, Debt and Equity Securities [Abstract] |
Schedule of Gross Realized and Unrealized Gains and Losses | Realized and unrealized gains and losses are detailed as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
| (in $ thousands)
Realized gains | 1,432 |  |  | 322 |  |  | 2,031 |  |  | 540 |
Realized losses | (158) |  |  | (108) |  |  | (2,550) |  |  | (488) |
Net unrealized investment gains recognized on equity securities still held | 4,340 |  |  | 4,500 |  |  | 9,913 |  |  | 11,186 |
| 5,614 |  |  | 4,714 |  |  | 9,394 |  |  | 11,238 |
Schedule of Investment Gains and Losses Recognized Related to Investments in Equity Securities | Investment gains and losses recognized related to investments in equity securities are as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
| (in $ thousands)
Net investment gains recognized on equity securities during the period | 4,317 |  |  | 4,796 |  |  | 9,569 |  |  | 11,489 |
Less: Net realized (losses) gains on equity securities sold during the period | (23) |  |  | 296 |  |  | (344) |  |  | 303 |
Net unrealized investment gains recognized on equity securities still held | 4,340 |  |  | 4,500 |  |  | 9,913 |  |  | 11,186 |
Schedule of Proceeds from Sale of Investments in Securities | The amortized costs and fair values of investments in debt securities are as follows:
| September 30, 2025 |  | December 31, 2024
| Amortized costs |  | Fair values |  | Amortized costs |  | Fair values
| (in $ thousands)
Municipal | 12,342 |  |  | 12,314 |  |  | 14,563 |  |  | 14,415 |
Corporate | 198,097 |  |  | 195,396 |  |  | 219,015 |  |  | 210,307 |
Foreign | 340,150 |  |  | 342,146 |  |  | 316,247 |  |  | 313,619 |
U.S. Treasury Bonds | 55,857 |  |  | 56,162 |  |  | 49,462 |  |  | 48,274 |
| 606,446 |  |  | 606,018 |  |  | 599,287 |  |  | 586,615 |
Proceeds from sales of investments in securities are as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
| (in $ thousands)
Proceeds from sales of debt securities | 7,109 |  |  | 12,361 |  |  | 40,620 |  |  | 33,129 |
Proceeds from sales of equity securities | 213 |  |  | 944 |  |  | 3,686 |  |  | 1,147 |
Total proceeds from sales of investments in securities | 7,322 |  |  | 13,305 |  |  | 44,306 |  |  | 34,276 |

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