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Investments in debt and equity securities (Tables) | 3 Months Ended
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Mar. 31, 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:
| March 31, 2025 |  | December 31, 2024
| Amortized costs |  | Fair values |  | Amortized costs |  | Fair values
| (in $ thousands)
Municipal | 14,505 |  |  | 14,401 |  |  | 14,563 |  |  | 14,415 |
Corporate | 212,348 |  |  | 206,005 |  |  | 219,015 |  |  | 210,307 |
Foreign | 317,246 |  |  | 318,070 |  |  | 316,247 |  |  | 313,619 |
U.S. Treasury Bonds | 54,445 |  |  | 54,221 |  |  | 49,462 |  |  | 48,274 |
| 598,544 |  |  | 592,697 |  |  | 599,287 |  |  | 586,615 |
Proceeds from sales of investments in securities are as follows:
|  |  | Three Months Ended March 31,
|  |  |  |  | 2025 |  | 2024
|  |  |  | (in $ thousands)
Proceeds from sales of debt securities |  |  |  |  | 12,544 |  |  | 20,767 |
Proceeds from sales of equity securities |  |  |  |  | 3,465 |  |  | 107 |
Total proceeds from sales of investments in securities |  |  |  |  | 16,009 |  |  | 20,874 |
Schedule of Gross Unrealized Gains and Losses | Gross unrealized gains and losses on investments in debt securities are as follows:
| March 31, 2025 |  | December 31, 2024
| Gains |  | Losses |  | Gains |  | Losses
| (in $ thousands)
Municipal | 5 |  |  | 109 |  |  | 1 |  |  | 149 |
Corporate | 822 |  |  | 7,165 |  |  | 524 |  |  | 9,232 |
Foreign | 4,798 |  |  | 3,974 |  |  | 2,979 |  |  | 5,607 |
U.S. Treasury Bonds | 249 |  |  | 473 |  |  | 5 |  |  | 1,193 |
| 5,874 |  |  | 11,721 |  |  | 3,509 |  |  | 16,181 |
Schedule of Debt Securities According to Contractual Terms | Debt securities as of March 31, 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 | 66,185 |  |  | 66,015 |
After one year through five years | 330,945 |  |  | 327,724 |
After five years through ten years | 188,984 |  |  | 187,989 |
After ten years | 12,430 |  |  | 10,969 |
| 598,544 |  |  | 592,697 |
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 March 31, 2025, were:
| Less than 12 months |  | More than 12 months |  | Total
| Losses |  | Fair values |  | Losses |  | Fair values |  | Losses |  | Fair values
| (in $ thousands)
Municipal | 21 |  |  | 3,569 |  |  | 88 |  |  | 7,447 |  |  | 109 |  |  | 11,016 |
Corporate | 35 |  |  | 7,633 |  |  | 7,130 |  |  | 158,357 |  |  | 7,165 |  |  | 165,990 |
Foreign | 212 |  |  | 13,707 |  |  | 3,762 |  |  | 138,329 |  |  | 3,974 |  |  | 152,036 |
U.S. Treasury Bonds | 281 |  |  | 24,448 |  |  | 192 |  |  | 10,690 |  |  | 473 |  |  | 35,138 |
| 549 |  |  | 49,357 |  |  | 11,172 |  |  | 314,823 |  |  | 11,721 |  |  | 364,180 |
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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