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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