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Investments in debt and equity securities (Tables) | 9 Months Ended
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Sep. 30, 2025
Investments, Debt and Equity Securities [Abstract] |
Schedule of Amortized Costs and Fair Values | 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 |
Schedule of Gross Unrealized Gains and Losses | Gross unrealized gains and losses on investments in debt securities are as follows:
| September 30, 2025 |  | December 31, 2024
| Gains |  | Losses |  | Gains |  | Losses
| (in $ thousands)
Municipal | 5 |  |  | 33 |  |  | 1 |  |  | 149 |
Corporate | 1,766 |  |  | 4,467 |  |  | 524 |  |  | 9,232 |
Foreign | 5,100 |  |  | 3,104 |  |  | 2,979 |  |  | 5,607 |
U.S. Treasury Bonds | 507 |  |  | 202 |  |  | 5 |  |  | 1,193 |
| 7,378 |  |  | 7,806 |  |  | 3,509 |  |  | 16,181 |
Schedule of Debt Securities According to Contractual Terms | Debt securities as of September 30, 2025 mature, according to their contractual terms, as follows (actual maturities may differ due to call or prepayment rights):
| Amortized costs |  | Fair values
| (in $ thousands)
In one year or less | 87,696 |  |  | 87,210 |
After one year through five years | 303,659 |  |  | 302,941 |
After five years through ten years | 199,697 |  |  | 201,510 |
After ten years | 15,394 |  |  | 14,357 |
| 606,446 |  |  | 606,018 |
Schedule of Gross Unrealized Losses on Investments and Fair Values of Related Securities | Gross unrealized losses on investments in debt securities and the fair values of the related securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position at September 30, 2025, were:
| Less than 12 months |  | More than 12 months |  | Total
| Losses |  | Fair values |  | Losses |  | Fair values |  | Losses |  | Fair values
| (in $ thousands)
Municipal | 5 |  |  | 3,613 |  |  | 28 |  |  | 5,246 |  |  | 33 |  |  | 8,859 |
Corporate | 35 |  |  | 6,782 |  |  | 4,432 |  |  | 130,568 |  |  | 4,467 |  |  | 137,350 |
Foreign | 172 |  |  | 27,729 |  |  | 2,932 |  |  | 121,462 |  |  | 3,104 |  |  | 149,191 |
U.S. Treasury Bonds | 67 |  |  | 12,170 |  |  | 135 |  |  | 8,130 |  |  | 202 |  |  | 20,300 |
| 279 |  |  | 50,294 |  |  | 7,527 |  |  | 265,406 |  |  | 7,806 |  |  | 315,700 |
Gross unrealized losses on investments in debt securities and the fair values of the related securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position at December 31, 2024, were:
| Less than 12 months |  | More than 12 months |  | Total
| Losses |  | Fair values |  | Losses |  | Fair values |  | Losses |  | Fair values
| (in $ thousands)
Municipal | 32 |  |  | 5,204 |  |  | 117 |  |  | 7,960 |  |  | 149 |  |  | 13,164 |
Corporate | 194 |  |  | 19,253 |  |  | 9,038 |  |  | 168,289 |  |  | 9,232 |  |  | 187,542 |
Foreign | 349 |  |  | 32,664 |  |  | 5,258 |  |  | 145,656 |  |  | 5,607 |  |  | 178,320 |
U.S. Treasury Bonds | 878 |  |  | 33,689 |  |  | 315 |  |  | 12,142 |  |  | 1,193 |  |  | 45,831 |
| 1,453 |  |  | 90,810 |  |  | 14,728 |  |  | 334,047 |  |  | 16,181 |  |  | 424,857 |

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