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Investments in debt and equity securities (Tables) | 3 Months Ended
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Mar. 31, 2026
Investments, Debt and Equity Securities [Abstract] |
Schedule of Amortized Costs and Fair Values of Investments in Debt Securities | The amortized costs and fair values of investments in debt securities are as follows:
| March 31, 2026 |  | December 31, 2025
| Amortized costs |  | Fair values |  | Amortized costs |  | Fair values
| (in $ thousands)
Municipal | 9,878 |  |  | 9,870 |  |  | 12,292 |  |  | 12,274 |
Corporate | 145,789 |  |  | 143,285 |  |  | 144,571 |  |  | 143,621 |
Foreign | 340,382 |  |  | 339,350 |  |  | 347,588 |  |  | 348,084 |
U.S. Treasury Bonds | 58,726 |  |  | 58,656 |  |  | 54,093 |  |  | 54,509 |
| 554,775 |  |  | 551,161 |  |  | 558,544 |  |  | 558,488 |
Proceeds from sales of investments in securities are as follows:
|  |  | Three Months Ended March 31,
|  |  |  |  | 2026 |  | 2025
|  |  |  |  | (in $ thousands)
Proceeds from sales of debt securities |  |  |  |  | 939 |  |  | 12,544 |
Proceeds from sales of equity securities |  |  |  |  | 67 |  |  | 3,465 |
Total proceeds from sales of investments in securities |  |  |  |  | 1,006 |  |  | 16,009 |
Schedule of Gross Unrealized Gains and Losses | Gross unrealized gains and losses on investments in debt securities are as follows:
| March 31, 2026 |  | December 31, 2025
| Gains |  | Losses |  | Gains |  | Losses
| (in $ thousands)
Municipal | 6 |  |  | 14 |  |  | 5 |  |  | 23 |
Corporate | 833 |  |  | 3,337 |  |  | 1,646 |  |  | 2,596 |
Foreign | 2,814 |  |  | 3,846 |  |  | 3,645 |  |  | 3,149 |
U.S. Treasury Bonds | 260 |  |  | 330 |  |  | 543 |  |  | 127 |
| 3,913 |  |  | 7,527 |  |  | 5,839 |  |  | 5,895 |
Schedule of Debt Securities According to Contractual Terms | Debt securities as of March 31, 2026 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 | 74,177 |  |  | 74,065 |
After one year through five years | 280,783 |  |  | 279,233 |
After five years through ten years | 186,074 |  |  | 185,330 |
After ten years | 13,741 |  |  | 12,533 |
| 554,775 |  |  | 551,161 |
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, 2026, were:
| Less than 12 months |  | More than 12 months |  | Total
| Losses |  | Fair values |  | Losses |  | Fair values |  | Losses |  | Fair values
| (in $ thousands)
Municipal | 3 |  |  | 2,432 |  |  | 11 |  |  | 2,499 |  |  | 14 |  |  | 4,931 |
Corporate | 243 |  |  | 25,258 |  |  | 3,094 |  |  | 70,236 |  |  | 3,337 |  |  | 95,494 |
Foreign | 901 |  |  | 89,000 |  |  | 2,945 |  |  | 113,451 |  |  | 3,846 |  |  | 202,451 |
U.S. Treasury Bonds | 216 |  |  | 29,526 |  |  | 114 |  |  | 5,808 |  |  | 330 |  |  | 35,334 |
| 1,363 |  |  | 146,216 |  |  | 6,164 |  |  | 191,994 |  |  | 7,527 |  |  | 338,210 |
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, 2025, were:
| Less than 12 months |  | More than 12 months |  | Total
| Losses |  | Fair values |  | Losses |  | Fair values |  | Losses |  | Fair values
| (in $ thousands)
Municipal | 4 |  |  | 2,621 |  |  | 19 |  |  | 5,918 |  |  | 23 |  |  | 8,539 |
Corporate | 9 |  |  | 10,284 |  |  | 2,587 |  |  | 71,989 |  |  | 2,596 |  |  | 82,273 |
Foreign | 364 |  |  | 43,539 |  |  | 2,785 |  |  | 119,970 |  |  | 3,149 |  |  | 163,509 |
U.S. Treasury Bonds | 36 |  |  | 8,720 |  |  | 91 |  |  | 6,425 |  |  | 127 |  |  | 15,145 |
| 413 |  |  | 65,164 |  |  | 5,482 |  |  | 204,302 |  |  | 5,895 |  |  | 269,466 |

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