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Financial instruments - Unsecured Obligations, Current (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Oct. 31, 2018
Financial instruments [Line Items] |  |  |
Notional amounts | $ 345,949 | $ 43,396 |
Current maturities | 345,949 | 43,396 |
Borrowing costs | (2,360) | (2,802) |
Total | 343,589 | 40,594 |
Not later than three months |  |  |
Financial instruments [Line Items] |  |  |
Notional amounts | 32,517 | 37,555 |
Current maturities | 32,517 | 37,555 |
Later than three months and not later than one year |  |  |
Financial instruments [Line Items] |  |  |
Notional amounts | 313,432 | 5,841 |
Current maturities | $ 313,432 | $ 5,841 |
Single series bond Two |  |  |
Financial instruments [Line Items] |  |  |
Nominal rate | 4.38% | 4.38% |
Effective rate | 1.17% | 1.56% |
Notional amounts | $ 4,648 | $ 4,648 |
Current maturities | 4,648 | 4,648 |
Borrowing costs | (433) | (433) |
Total | 4,215 | 4,215 |
Single series bond Two | Not later than three months |  |  |
Financial instruments [Line Items] |  |  |
Notional amounts | 4,648 | 4,648 |
Current maturities | 4,648 | 4,648 |
Single series bond Two | Later than three months and not later than one year |  |  |
Financial instruments [Line Items] |  |  |
Notional amounts | 0 | 0 |
Current maturities | $ 0 | $ 0 |
Single series bond Three |  |  |
Financial instruments [Line Items] |  |  |
Nominal rate | 3.63% | 3.63% |
Effective rate | 0.56% | 0.74% |
Notional amounts | $ 302,658 | $ 2,658 |
Current maturities | 302,658 | 2,658 |
Borrowing costs | (170) | (614) |
Total | 302,488 | 2,044 |
Single series bond Three | Not later than three months |  |  |
Financial instruments [Line Items] |  |  |
Notional amounts | 0 | 0 |
Current maturities | 0 | 0 |
Single series bond Three | Later than three months and not later than one year |  |  |
Financial instruments [Line Items] |  |  |
Notional amounts | 302,658 | 2,658 |
Current maturities | $ 302,658 | $ 2,658 |
Single series bond Five |  |  |
Financial instruments [Line Items] |  |  |
Nominal rate | 4.25% | 4.25% |
Effective rate | 3.01% | 3.23% |
Notional amounts | $ 2,869 | $ 2,869 |
Current maturities | 2,869 | 2,869 |
Borrowing costs | (679) | (679) |
Total | 2,190 | 2,190 |
Single series bond Five | Not later than three months |  |  |
Financial instruments [Line Items] |  |  |
Notional amounts | 0 | 0 |
Current maturities | 0 | 0 |
Single series bond Five | Later than three months and not later than one year |  |  |
Financial instruments [Line Items] |  |  |
Notional amounts | 2,869 | 2,869 |
Current maturities | $ 2,869 | $ 2,869 |
Series H bonds |  |  |
Financial instruments [Line Items] |  |  |
Nominal rate | 4.90% | 4.90% |
Effective rate | 1.23% | 1.75% |
Notional amounts | $ 17,566 | $ 16,026 |
Current maturities | 17,566 | 16,026 |
Borrowing costs | (172) | (172) |
Total | 17,394 | 15,854 |
Series H bonds | Not later than three months |  |  |
Financial instruments [Line Items] |  |  |
Notional amounts | 17,566 | 16,026 |
Current maturities | 17,566 | 16,026 |
Series H bonds | Later than three months and not later than one year |  |  |
Financial instruments [Line Items] |  |  |
Notional amounts | 0 | 0 |
Current maturities | $ 0 | $ 0 |
Series O bonds |  |  |
Financial instruments [Line Items] |  |  |
Nominal rate | 3.80% | 3.80% |
Effective rate | 1.89% | 2.06% |
Notional amounts | $ 965 | $ 863 |
Current maturities | 965 | 863 |
Borrowing costs | (82) | (82) |
Total | 883 | 781 |
Series O bonds | Not later than three months |  |  |
Financial instruments [Line Items] |  |  |
Notional amounts | 965 | 863 |
Current maturities | 965 | 863 |
Series O bonds | Later than three months and not later than one year |  |  |
Financial instruments [Line Items] |  |  |
Notional amounts | 0 | 0 |
Current maturities | $ 0 | $ 0 |
Series P bonds |  |  |
Financial instruments [Line Items] |  |  |
Nominal rate | 3.25% | 3.25% |
Effective rate | 1.72% | 2.04% |
Notional amounts | $ 1,830 | $ 1,636 |
Current maturities | 1,830 | 1,636 |
Borrowing costs | (12) | (12) |
Total | 1,818 | 1,624 |
Series P bonds | Not later than three months |  |  |
Financial instruments [Line Items] |  |  |
Notional amounts | 1,830 | 1,636 |
Current maturities | 1,830 | 1,636 |
Series P bonds | Later than three months and not later than one year |  |  |
Financial instruments [Line Items] |  |  |
Notional amounts | 0 | 0 |
Current maturities | $ 0 | $ 0 |
Series Q bonds |  |  |
Financial instruments [Line Items] |  |  |
Nominal rate | 3.45% | 3.45% |
Effective rate | 2.63% | 2.72% | 3.45%
Notional amounts | $ 351 | $ 314 |
Current maturities | 351 | 314 |
Borrowing costs | (20) | (21) |
Total | 331 | 293 |
Series Q bonds | Not later than three months |  |  |
Financial instruments [Line Items] |  |  |
Notional amounts | 0 | 0 |
Current maturities | 0 | 0 |
Series Q bonds | Later than three months and not later than one year |  |  |
Financial instruments [Line Items] |  |  |
Notional amounts | 351 | 314 |
Current maturities | $ 351 | $ 314 |
Single Series Bond Six |  |  |
Financial instruments [Line Items] |  |  |
Nominal rate | 4.25% | 4.25% |
Effective rate | 3.79% | 4.00% |
Notional amounts | $ 7,508 | $ 7,508 |
Current maturities | 7,508 | 7,508 |
Borrowing costs | (237) | (237) |
Total | 7,271 | 7,271 |
Single Series Bond Six | Not later than three months |  |  |
Financial instruments [Line Items] |  |  |
Notional amounts | 7,508 | 7,508 |
Current maturities | 7,508 | 7,508 |
Single Series Bond Six | Later than three months and not later than one year |  |  |
Financial instruments [Line Items] |  |  |
Notional amounts | 0 | 0 |
Current maturities | $ 0 | $ 0 |
Single Series Seventh Issue Bonds |  |  |
Financial instruments [Line Items] |  |  |
Nominal rate | 3.50% | 3.50% |
Effective rate | 3.44% | 3.62% |
Notional amounts | $ 7,554 | $ 6,874 |
Current maturities | 7,554 | 6,874 |
Borrowing costs | (555) | (552) |
Total | 6,999 | 6,322 |
Single Series Seventh Issue Bonds | Not later than three months |  |  |
Financial instruments [Line Items] |  |  |
Notional amounts | 0 | 6,874 |
Current maturities | 0 | 6,874 |
Single Series Seventh Issue Bonds | Later than three months and not later than one year |  |  |
Financial instruments [Line Items] |  |  |
Notional amounts | 7,554 | 0 |
Current maturities | $ 7,554 | $ 0 |

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