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Financial instruments - Unsecured Obligations, Current (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Financial instruments [Line Items] |  |
Notional amount | $ 313,107 | $ 50,707
Current maturities | 313,107 | 50,707
Borrowing costs | (5,336) | (3,708)
Total | 307,771 | 46,999
Up to 90 days |  |
Financial instruments [Line Items] |  |
Notional amount | 302,595 | 40,167
Current maturities | 302,595 | 40,167
90 days to 1 year |  |
Financial instruments [Line Items] |  |
Notional amount | 10,512 | 10,540
Current maturities | $ 10,512 | $ 10,540
Single Series Bond, ThUS$250,000 |  |
Financial instruments [Line Items] |  |
Effective rate | 0.39% | 0.80%
Nominal rate | 4.38% | 4.38%
Notional amount | $ 254,648 | $ 4,648
Current maturities | 254,648 | 4,648
Borrowing costs | (36) | (433)
Total | 254,612 | 4,215
Single Series Bond, ThUS$250,000 | Up to 90 days |  |
Financial instruments [Line Items] |  |
Notional amount | 254,648 | 4,648
Current maturities | 254,648 | 4,648
Single Series Bond, ThUS$250,000 | 90 days to 1 year |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Current maturities | $ 0 | $ 0
Single Series Bond, ThUS$450,000 |  |
Financial instruments [Line Items] |  |
Effective rate | 1.98% | 2.39%
Nominal rate | 4.25% | 4.25%
Notional amount | $ 2,869 | $ 2,869
Current maturities | 2,869 | 2,869
Borrowing costs | (677) | (677)
Total | 2,192 | 2,192
Single Series Bond, ThUS$450,000 | Up to 90 days |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Current maturities | 0 | 0
Single Series Bond, ThUS$450,000 | 90 days to 1 year |  |
Financial instruments [Line Items] |  |
Notional amount | 2,869 | 2,869
Current maturities | $ 2,869 | $ 2,869
Single Series Bond, ThUS$400,000 |  |
Financial instruments [Line Items] |  |
Effective rate | 3.43% | 3.62%
Nominal rate | 4.25% | 4.25%
Notional amount | $ 7,508 | $ 7,508
Current maturities | 7,508 | 7,508
Borrowing costs | (235) | (235)
Total | 7,273 | 7,273
Single Series Bond, ThUS$400,000 | Up to 90 days |  |
Financial instruments [Line Items] |  |
Notional amount | 7,508 | 7,508
Current maturities | 7,508 | 7,508
Single Series Bond, ThUS$400,000 | 90 days to 1 year |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Current maturities | $ 0 | $ 0
Single Series Bond, ThUS$700,000 |  |
Financial instruments [Line Items] |  |
Effective rate | 3.14% | 3.30%
Nominal rate | 3.50% | 3.50%
Notional amount | $ 7,554 | $ 7,554
Current maturities | 7,554 | 7,554
Borrowing costs | (555) | (555)
Total | 6,999 | 6,999
Single Series Bond, ThUS$700,000 | Up to 90 days |  |
Financial instruments [Line Items] |  |
Notional amount | 7,554 | 7,554
Current maturities | 7,554 | 7,554
Single Series Bond, ThUS$700,000 | 90 days to 1 year |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Current maturities | $ 0 | $ 0
Single Series Bond, ThUS$750,000 |  |
Financial instruments [Line Items] |  |
Effective rate | 6.02% | 6.89%
Nominal rate | 6.50% | 6.50%
Notional amount | $ 7,313 | $ 7,312
Current maturities | 7,313 | 7,312
Borrowing costs | (1,611) | (1,521)
Total | 5,702 | 5,791
Single Series Bond, ThUS$750,000 | Up to 90 days |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Current maturities | 0 | 0
Single Series Bond, ThUS$750,000 | 90 days to 1 year |  |
Financial instruments [Line Items] |  |
Notional amount | 7,313 | 7,312
Current maturities | $ 7,313 | $ 7,312
Single Series Bond, ThUS$850,000 |  |
Financial instruments [Line Items] |  |
Effective rate | 5.86% |
Nominal rate | 5.50% |
Notional amount | $ 14,415 |
Current maturities | 14,415 |
Borrowing costs | (1,935) |
Total | 12,480 |
Single Series Bond, ThUS$850,000 | Up to 90 days |  |
Financial instruments [Line Items] |  |
Notional amount | 14,415 |
Current maturities | 14,415 |
Single Series Bond, ThUS$850,000 | 90 days to 1 year |  |
Financial instruments [Line Items] |  |
Notional amount | 0 |
Current maturities | $ 0 |
Series H bonds |  |
Financial instruments [Line Items] |  |
Effective rate | 1.55% | 1.58%
Nominal rate | 4.90% | 4.90%
Notional amount | $ 15,844 | $ 17,599
Current maturities | 15,844 | 17,599
Borrowing costs | (172) | (172)
Total | 15,672 | 17,427
Series H bonds | Up to 90 days |  |
Financial instruments [Line Items] |  |
Notional amount | 15,844 | 17,599
Current maturities | 15,844 | 17,599
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 | 1.51% | 1.68%
Nominal rate | 3.80% | 3.80%
Notional amount | $ 907 | $ 987
Current maturities | 907 | 987
Borrowing costs | (81) | (82)
Total | 826 | 905
Series O bonds | Up to 90 days |  |
Financial instruments [Line Items] |  |
Notional amount | 907 | 987
Current maturities | 907 | 987
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 | 1.10% | 1.41%
Nominal rate | 3.25% | 3.25%
Notional amount | $ 1,719 | $ 1,871
Current maturities | 1,719 | 1,871
Borrowing costs | (12) | (12)
Total | 1,707 | 1,859
Series P bonds | Up to 90 days |  |
Financial instruments [Line Items] |  |
Notional amount | 1,719 | 1,871
Current maturities | 1,719 | 1,871
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 | 2.23% | 2.41%
Nominal rate | 3.45% | 3.45%
Notional amount | $ 330 | $ 359
Current maturities | 330 | 359
Borrowing costs | (22) | (21)
Total | 308 | 338
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 | 330 | 359
Current maturities | $ 330 | $ 359

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