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Financial instruments - Non-Current Unsecured Interest-Bearing Bonds and Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Oct. 31, 2018
Financial instruments [Line Items] |  |  |
Principal | $ 345,949 | $ 43,396 |
Borrowing costs | $ (2,360) | $ (2,802) |
Single series bond Two |  |  |
Financial instruments [Line Items] |  |  |
Effective rate | 1.17% | 1.56% |
Nominal rate | 4.38% | 4.38% |
Principal | $ 4,648 | $ 4,648 |
Borrowing costs | $ (433) | $ (433) |
Single series bond Three |  |  |
Financial instruments [Line Items] |  |  |
Effective rate | 0.56% | 0.74% |
Nominal rate | 3.63% | 3.63% |
Principal | $ 302,658 | $ 2,658 |
Borrowing costs | $ (170) | $ (614) |
Single series bond Five |  |  |
Financial instruments [Line Items] |  |  |
Effective rate | 3.01% | 3.23% |
Nominal rate | 4.25% | 4.25% |
Principal | $ 2,869 | $ 2,869 |
Borrowing costs | $ (679) | $ (679) |
Series H bonds |  |  |
Financial instruments [Line Items] |  |  |
Effective rate | 1.23% | 1.75% |
Nominal rate | 4.90% | 4.90% |
Principal | $ 17,566 | $ 16,026 |
Borrowing costs | $ (172) | $ (172) |
Series O bonds |  |  |
Financial instruments [Line Items] |  |  |
Effective rate | 1.89% | 2.06% |
Nominal rate | 3.80% | 3.80% |
Principal | $ 965 | $ 863 |
Borrowing costs | $ (82) | $ (82) |
Series P bonds |  |  |
Financial instruments [Line Items] |  |  |
Effective rate | 1.72% | 2.04% |
Nominal rate | 3.25% | 3.25% |
Principal | $ 1,830 | $ 1,636 |
Borrowing costs | $ (12) | $ (12) |
Series Q bonds |  |  |
Financial instruments [Line Items] |  |  |
Effective rate | 2.63% | 2.72% | 3.45%
Nominal rate | 3.45% | 3.45% |
Principal | $ 351 | $ 314 |
Borrowing costs | $ (20) | $ (21) |
Single Series Bond Six |  |  |
Financial instruments [Line Items] |  |  |
Effective rate | 3.79% | 4.00% |
Nominal rate | 4.25% | 4.25% |
Principal | $ 7,508 | $ 7,508 |
Borrowing costs | $ (237) | $ (237) |
Single Series Seventh Issue Bonds |  |  |
Financial instruments [Line Items] |  |  |
Effective rate | 3.44% | 3.62% |
Nominal rate | 3.50% | 3.50% |
Principal | $ 7,554 | $ 6,874 |
Borrowing costs | (555) | (552) |
Unsecured obligations |  |  |
Financial instruments [Line Items] |  |  |
Principal | 2,204,648 | 2,475,239 |
Non-current maturities | 2,204,648 | 2,475,239 |
Borrowing costs | (27,724) | (30,020) |
Total | 2,176,924 | 2,445,219 |
Unsecured obligations | Over 1 year to 2 years |  |  |
Financial instruments [Line Items] |  |  |
Principal | 0 | 300,000 |
Non-current maturities | 0 | 300,000 |
Unsecured obligations | Over 2 year to 3 years |  |  |
Financial instruments [Line Items] |  |  |
Principal | 0 | 0 |
Non-current maturities | 0 | 0 |
Unsecured obligations | Over 3 year to 4 years |  |  |
Financial instruments [Line Items] |  |  |
Principal | 250,000 | 250,000 |
Non-current maturities | 250,000 | 250,000 |
Unsecured obligations | Over 4 year to 5 years |  |  |
Financial instruments [Line Items] |  |  |
Principal | 0 | 0 |
Non-current maturities | 0 | 0 |
Unsecured obligations | Over 5 Years |  |  |
Financial instruments [Line Items] |  |  |
Principal | 1,954,648 | 1,925,239 |
Non-current maturities | $ 1,954,648 | $ 1,925,239 |
Unsecured obligations | Single series bond Two |  |  |
Financial instruments [Line Items] |  |  |
Effective rate | 4.08% | 4.08% |
Nominal rate | 4.38% | 4.38% |
Principal | $ 250,000 | $ 250,000 |
Non-current maturities | 250,000 | 250,000 |
Borrowing costs | (469) | (903) |
Total | 249,531 | 249,097 |
Unsecured obligations | Single series bond Two | Over 1 year to 2 years |  |  |
Financial instruments [Line Items] |  |  |
Principal | 0 | 0 |
Non-current maturities | 0 | 0 |
Unsecured obligations | Single series bond Two | Over 2 year to 3 years |  |  |
Financial instruments [Line Items] |  |  |
Principal | 0 | 0 |
Non-current maturities | 0 | 0 |
Unsecured obligations | Single series bond Two | Over 3 year to 4 years |  |  |
Financial instruments [Line Items] |  |  |
Principal | 250,000 | 250,000 |
Non-current maturities | 250,000 | 250,000 |
Unsecured obligations | Single series bond Two | Over 4 year to 5 years |  |  |
Financial instruments [Line Items] |  |  |
Principal | 0 | 0 |
Non-current maturities | 0 | 0 |
Unsecured obligations | Single series bond Two | Over 5 Years |  |  |
Financial instruments [Line Items] |  |  |
Principal | 0 | 0 |
Non-current maturities | $ 0 | $ 0 |
Unsecured obligations | Single series bond Three |  |  |
Financial instruments [Line Items] |  |  |
Effective rate |  | 3.42% |
Nominal rate |  | 3.63% |
Principal |  | $ 300,000 |
Non-current maturities |  | 300,000 |
Borrowing costs |  | (168) |
Total |  | 299,832 |
Unsecured obligations | Single series bond Three | Over 1 year to 2 years |  |  |
Financial instruments [Line Items] |  |  |
Principal |  | 300,000 |
Non-current maturities |  | 300,000 |
Unsecured obligations | Single series bond Three | Over 2 year to 3 years |  |  |
Financial instruments [Line Items] |  |  |
Principal |  | 0 |
Non-current maturities |  | 0 |
Unsecured obligations | Single series bond Three | Over 3 year to 4 years |  |  |
Financial instruments [Line Items] |  |  |
Principal |  | 0 |
Non-current maturities |  | 0 |
Unsecured obligations | Single series bond Three | Over 4 year to 5 years |  |  |
Financial instruments [Line Items] |  |  |
Principal |  | 0 |
Non-current maturities |  | 0 |
Unsecured obligations | Single series bond Three | Over 5 Years |  |  |
Financial instruments [Line Items] |  |  |
Principal |  | 0 |
Non-current maturities |  | $ 0 |
Unsecured obligations | Single series bond Five |  |  |
Financial instruments [Line Items] |  |  |
Effective rate | 4.10% | 4.10% |
Nominal rate | 4.25% | 4.25% |
Principal | $ 450,000 | $ 450,000 |
Non-current maturities | 450,000 | 450,000 |
Borrowing costs | (3,666) | (4,343) |
Total | 446,334 | 445,657 |
Unsecured obligations | Single series bond Five | Over 1 year to 2 years |  |  |
Financial instruments [Line Items] |  |  |
Principal | 0 | 0 |
Non-current maturities | 0 | 0 |
Unsecured obligations | Single series bond Five | Over 2 year to 3 years |  |  |
Financial instruments [Line Items] |  |  |
Principal | 0 | 0 |
Non-current maturities | 0 | 0 |
Unsecured obligations | Single series bond Five | Over 3 year to 4 years |  |  |
Financial instruments [Line Items] |  |  |
Principal | 0 | 0 |
Non-current maturities | 0 | 0 |
Unsecured obligations | Single series bond Five | Over 4 year to 5 years |  |  |
Financial instruments [Line Items] |  |  |
Principal | 0 | 0 |
Non-current maturities | 0 | 0 |
Unsecured obligations | Single series bond Five | Over 5 Years |  |  |
Financial instruments [Line Items] |  |  |
Principal | 450,000 | 450,000 |
Non-current maturities | $ 450,000 | $ 450,000 |
Unsecured obligations | Series H bonds |  |  |
Financial instruments [Line Items] |  |  |
Effective rate | 4.76% | 4.76% |
Nominal rate | 4.90% | 4.90% |
Principal | $ 96,967 | $ 100,064 |
Non-current maturities | 96,967 | 100,064 |
Borrowing costs | (1,034) | (1,206) |
Total | 95,933 | 98,858 |
Unsecured obligations | Series H bonds | Over 1 year to 2 years |  |  |
Financial instruments [Line Items] |  |  |
Principal | 0 | 0 |
Non-current maturities | 0 | 0 |
Unsecured obligations | Series H bonds | Over 2 year to 3 years |  |  |
Financial instruments [Line Items] |  |  |
Principal | 0 | 0 |
Non-current maturities | 0 | 0 |
Unsecured obligations | Series H bonds | Over 3 year to 4 years |  |  |
Financial instruments [Line Items] |  |  |
Principal | 0 | 0 |
Non-current maturities | 0 | 0 |
Unsecured obligations | Series H bonds | Over 4 year to 5 years |  |  |
Financial instruments [Line Items] |  |  |
Principal | 0 | 0 |
Non-current maturities | 0 | 0 |
Unsecured obligations | Series H bonds | Over 5 Years |  |  |
Financial instruments [Line Items] |  |  |
Principal | 96,967 | 100,064 |
Non-current maturities | $ 96,967 | $ 100,064 |
Unsecured obligations | Series O bonds |  |  |
Financial instruments [Line Items] |  |  |
Effective rate | 3.69% | 3.69% |
Nominal rate | 3.80% | 3.80% |
Principal | $ 61,536 | $ 55,035 |
Non-current maturities | 61,536 | 55,035 |
Borrowing costs | (741) | (822) |
Total | 60,795 | 54,213 |
Unsecured obligations | Series O bonds | Over 1 year to 2 years |  |  |
Financial instruments [Line Items] |  |  |
Principal | 0 | 0 |
Non-current maturities | 0 | 0 |
Unsecured obligations | Series O bonds | Over 2 year to 3 years |  |  |
Financial instruments [Line Items] |  |  |
Principal | 0 | 0 |
Non-current maturities | 0 | 0 |
Unsecured obligations | Series O bonds | Over 3 year to 4 years |  |  |
Financial instruments [Line Items] |  |  |
Principal | 0 | 0 |
Non-current maturities | 0 | 0 |
Unsecured obligations | Series O bonds | Over 4 year to 5 years |  |  |
Financial instruments [Line Items] |  |  |
Principal | 0 | 0 |
Non-current maturities | 0 | 0 |
Unsecured obligations | Series O bonds | Over 5 Years |  |  |
Financial instruments [Line Items] |  |  |
Principal | 61,536 | 55,035 |
Non-current maturities | $ 61,536 | $ 55,035 |
Unsecured obligations | Series P bonds |  |  |
Financial instruments [Line Items] |  |  |
Effective rate | 3.24% | 3.24% |
Nominal rate | 3.25% | 3.25% |
Principal | $ 123,072 | $ 110,070 |
Non-current maturities | 123,072 | 110,070 |
Borrowing costs | (52) | (65) |
Total | 123,020 | 110,005 |
Unsecured obligations | Series P bonds | Over 1 year to 2 years |  |  |
Financial instruments [Line Items] |  |  |
Principal | 0 | 0 |
Non-current maturities | 0 | 0 |
Unsecured obligations | Series P bonds | Over 2 year to 3 years |  |  |
Financial instruments [Line Items] |  |  |
Principal | 0 | 0 |
Non-current maturities | 0 | 0 |
Unsecured obligations | Series P bonds | Over 3 year to 4 years |  |  |
Financial instruments [Line Items] |  |  |
Principal | 0 | 0 |
Non-current maturities | 0 | 0 |
Unsecured obligations | Series P bonds | Over 4 year to 5 years |  |  |
Financial instruments [Line Items] |  |  |
Principal | 0 | 0 |
Non-current maturities | 0 | 0 |
Unsecured obligations | Series P bonds | Over 5 Years |  |  |
Financial instruments [Line Items] |  |  |
Principal | 123,072 | 110,070 |
Non-current maturities | $ 123,072 | $ 110,070 |
Unsecured obligations | Series Q bonds |  |  |
Financial instruments [Line Items] |  |  |
Effective rate | 3.43% | 3.43% |
Nominal rate | 3.45% | 3.45% |
Principal | $ 123,073 | $ 110,070 |
Non-current maturities | 123,073 | 110,070 |
Borrowing costs | (309) | (330) |
Total | 122,764 | 109,740 |
Unsecured obligations | Series Q bonds | Over 1 year to 2 years |  |  |
Financial instruments [Line Items] |  |  |
Principal | 0 | 0 |
Non-current maturities | 0 | 0 |
Unsecured obligations | Series Q bonds | Over 2 year to 3 years |  |  |
Financial instruments [Line Items] |  |  |
Principal | 0 | 0 |
Non-current maturities | 0 | 0 |
Unsecured obligations | Series Q bonds | Over 3 year to 4 years |  |  |
Financial instruments [Line Items] |  |  |
Principal | 0 | 0 |
Non-current maturities | 0 | 0 |
Unsecured obligations | Series Q bonds | Over 4 year to 5 years |  |  |
Financial instruments [Line Items] |  |  |
Principal | 0 | 0 |
Non-current maturities | 0 | 0 |
Unsecured obligations | Series Q bonds | Over 5 Years |  |  |
Financial instruments [Line Items] |  |  |
Principal | 123,073 | 110,070 |
Non-current maturities | $ 123,073 | $ 110,070 |
Unsecured obligations | Single Series Bond Six |  |  |
Financial instruments [Line Items] |  |  |
Effective rate | 4.19% | 4.19% |
Nominal rate | 4.25% | 4.25% |
Principal | $ 400,000 | $ 400,000 |
Non-current maturities | 400,000 | 400,000 |
Borrowing costs | (6,112) | (6,347) |
Total | 393,888 | 393,653 |
Unsecured obligations | Single Series Bond Six | Over 1 year to 2 years |  |  |
Financial instruments [Line Items] |  |  |
Principal | 0 | 0 |
Non-current maturities | 0 | 0 |
Unsecured obligations | Single Series Bond Six | Over 2 year to 3 years |  |  |
Financial instruments [Line Items] |  |  |
Principal | 0 | 0 |
Non-current maturities | 0 | 0 |
Unsecured obligations | Single Series Bond Six | Over 3 year to 4 years |  |  |
Financial instruments [Line Items] |  |  |
Principal | 0 | 0 |
Non-current maturities | 0 | 0 |
Unsecured obligations | Single Series Bond Six | Over 4 year to 5 years |  |  |
Financial instruments [Line Items] |  |  |
Principal | 0 | 0 |
Non-current maturities | 0 | 0 |
Unsecured obligations | Single Series Bond Six | Over 5 Years |  |  |
Financial instruments [Line Items] |  |  |
Principal | 400,000 | 400,000 |
Non-current maturities | $ 400,000 | $ 400,000 |
Unsecured obligations | Single Series Seventh Issue Bonds |  |  |
Financial instruments [Line Items] |  |  |
Effective rate | 3.42% | 3.43% |
Nominal rate | 3.50% | 3.50% |
Principal | $ 700,000 | $ 700,000 |
Non-current maturities | 700,000 | 700,000 |
Borrowing costs | (15,341) | (15,836) |
Total | 684,659 | 684,164 |
Unsecured obligations | Single Series Seventh Issue Bonds | Over 1 year to 2 years |  |  |
Financial instruments [Line Items] |  |  |
Principal | 0 | 0 |
Non-current maturities | 0 | 0 |
Unsecured obligations | Single Series Seventh Issue Bonds | Over 2 year to 3 years |  |  |
Financial instruments [Line Items] |  |  |
Principal | 0 | 0 |
Non-current maturities | 0 | 0 |
Unsecured obligations | Single Series Seventh Issue Bonds | Over 3 year to 4 years |  |  |
Financial instruments [Line Items] |  |  |
Principal | 0 | 0 |
Non-current maturities | 0 | 0 |
Unsecured obligations | Single Series Seventh Issue Bonds | Over 4 year to 5 years |  |  |
Financial instruments [Line Items] |  |  |
Principal | 0 | 0 |
Non-current maturities | 0 | 0 |
Unsecured obligations | Single Series Seventh Issue Bonds | Over 5 Years |  |  |
Financial instruments [Line Items] |  |  |
Principal | 700,000 | 700,000 |
Non-current maturities | $ 700,000 | $ 700,000 |

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