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Financial instruments - Unsecured Obligations, Current (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Financial instruments [Line Items] |  |
Notional amount | $ 50,707 | $ 345,949
Current maturities | 50,707 | 345,949
Borrowing costs | (3,708) | (2,360)
Total | 46,999 | 343,589
Up to 90 days |  |
Financial instruments [Line Items] |  |
Notional amount | 40,167 | 32,517
Current maturities | 40,167 | 32,517
90 days to 1 year |  |
Financial instruments [Line Items] |  |
Notional amount | 10,540 | 313,432
Current maturities | $ 10,540 | $ 313,432
Single Series Bond One |  |
Financial instruments [Line Items] |  |
Effective rate | 0.80% | 1.17%
Nominal rate | 4.38% | 4.38%
Notional amount | $ 4,648 | $ 4,648
Current maturities | 4,648 | 4,648
Borrowing costs | (433) | (433)
Total | 4,215 | 4,215
Single Series Bond One | Up to 90 days |  |
Financial instruments [Line Items] |  |
Notional amount | 4,648 | 4,648
Current maturities | 4,648 | 4,648
Single Series Bond One | 90 days to 1 year |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Current maturities | $ 0 | $ 0
Single Series Bond Two |  |
Financial instruments [Line Items] |  |
Effective rate | 2.39% | 0.56%
Nominal rate | 4.25% | 3.63%
Notional amount | $ 2,869 | $ 302,658
Current maturities | 2,869 | 302,658
Borrowing costs | (677) | (170)
Total | 2,192 | 302,488
Single Series Bond Two | Up to 90 days |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Current maturities | 0 | 0
Single Series Bond Two | 90 days to 1 year |  |
Financial instruments [Line Items] |  |
Notional amount | 2,869 | 302,658
Current maturities | $ 2,869 | $ 302,658
Single Series Bond Three |  |
Financial instruments [Line Items] |  |
Effective rate | 3.62% | 3.01%
Nominal rate | 4.25% | 4.25%
Notional amount | $ 7,508 | $ 2,869
Current maturities | 7,508 | 2,869
Borrowing costs | (235) | (679)
Total | 7,273 | 2,190
Single Series Bond Three | Up to 90 days |  |
Financial instruments [Line Items] |  |
Notional amount | 7,508 | 0
Current maturities | 7,508 | 0
Single Series Bond Three | 90 days to 1 year |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 2,869
Current maturities | $ 0 | $ 2,869
Single Series Bond Four |  |
Financial instruments [Line Items] |  |
Effective rate | 3.30% | 3.79%
Nominal rate | 3.50% | 4.25%
Notional amount | $ 7,554 | $ 7,508
Current maturities | 7,554 | 7,508
Borrowing costs | (555) | (237)
Total | 6,999 | 7,271
Single Series Bond Four | Up to 90 days |  |
Financial instruments [Line Items] |  |
Notional amount | 7,554 | 7,508
Current maturities | 7,554 | 7,508
Single Series Bond Four | 90 days to 1 year |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Current maturities | $ 0 | $ 0
Single Series Bond Five |  |
Financial instruments [Line Items] |  |
Effective rate | 6.89% | 3.44%
Nominal rate | 6.50% | 3.50%
Notional amount | $ 7,312 | $ 7,554
Current maturities | 7,312 | 7,554
Borrowing costs | (1,521) | (555)
Total | 5,791 | 6,999
Single Series Bond Five | Up to 90 days |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Current maturities | 0 | 0
Single Series Bond Five | 90 days to 1 year |  |
Financial instruments [Line Items] |  |
Notional amount | 7,312 | 7,554
Current maturities | $ 7,312 | $ 7,554
Series H bonds |  |
Financial instruments [Line Items] |  |
Effective rate | 1.58% | 1.23%
Nominal rate | 4.90% | 4.90%
Notional amount | $ 17,599 | $ 17,566
Current maturities | 17,599 | 17,566
Borrowing costs | (172) | (172)
Total | 17,427 | 17,394
Series H bonds | Up to 90 days |  |
Financial instruments [Line Items] |  |
Notional amount | 17,599 | 17,566
Current maturities | 17,599 | 17,566
Series H bonds | 90 days to 1 year |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Current maturities | $ 0 | $ 0
Series O bonds |  |
Financial instruments [Line Items] |  |
Effective rate | 1.68% | 1.89%
Nominal rate | 3.80% | 3.80%
Notional amount | $ 987 | $ 965
Current maturities | 987 | 965
Borrowing costs | (82) | (82)
Total | 905 | 883
Series O bonds | Up to 90 days |  |
Financial instruments [Line Items] |  |
Notional amount | 987 | 965
Current maturities | 987 | 965
Series O bonds | 90 days to 1 year |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Current maturities | $ 0 | $ 0
Series P bonds |  |
Financial instruments [Line Items] |  |
Effective rate | 1.41% | 1.72%
Nominal rate | 3.25% | 3.25%
Notional amount | $ 1,871 | $ 1,830
Current maturities | 1,871 | 1,830
Borrowing costs | (12) | (12)
Total | 1,859 | 1,818
Series P bonds | Up to 90 days |  |
Financial instruments [Line Items] |  |
Notional amount | 1,871 | 1,830
Current maturities | 1,871 | 1,830
Series P bonds | 90 days to 1 year |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Current maturities | $ 0 | $ 0
Series Q bonds |  |
Financial instruments [Line Items] |  |
Effective rate | 2.41% | 2.63%
Nominal rate | 3.45% | 3.45%
Notional amount | $ 359 | $ 351
Current maturities | 359 | 351
Borrowing costs | (21) | (20)
Total | 338 | 331
Series Q bonds | Up to 90 days |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Current maturities | 0 | 0
Series Q bonds | 90 days to 1 year |  |
Financial instruments [Line Items] |  |
Notional amount | 359 | 351
Current maturities | $ 359 | $ 351

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