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Financial instruments - Unsecured Obligations, Non-Current (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Financial instruments [Line Items] |  |
Notional amount | $ 50,707 | $ 345,949
Bond issuance costs | (3,708) | (2,360)
Unsecured obligations |  |
Financial instruments [Line Items] |  |
Notional amount | 2,948,462 | 2,204,648
Carrying amount | 2,948,462 | 2,204,648
Bond issuance costs | (38,977) | (27,724)
Total | 2,909,485 | 2,176,924
Unsecured obligations | Over 1 year to 2 years |  |
Financial instruments [Line Items] |  |
Notional amount | 250,000 | 0
Carrying amount | 250,000 | 0
Unsecured obligations | Over 2 years to 3 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Unsecured obligations | Over 3 years to 4 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 250,000
Carrying amount | 0 | 250,000
Unsecured obligations | Over 4 years to 5 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Unsecured obligations | Over 5 years |  |
Financial instruments [Line Items] |  |
Notional amount | 2,698,462 | 1,954,648
Carrying amount | $ 2,698,462 | $ 1,954,648
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
Bond issuance costs | $ (433) | $ (433)
Single Series Bond One | Unsecured obligations |  |
Financial instruments [Line Items] |  |
Effective rate | 4.24% | 4.08%
Nominal rate | 4.38% | 4.38%
Notional amount | $ 250,000 | $ 250,000
Carrying amount | 250,000 | 250,000
Bond issuance costs | (36) | (469)
Total | 249,964 | 249,531
Single Series Bond One | Unsecured obligations | Over 1 year to 2 years |  |
Financial instruments [Line Items] |  |
Notional amount | 250,000 | 0
Carrying amount | 250,000 | 0
Single Series Bond One | Unsecured obligations | Over 2 years to 3 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Single Series Bond One | Unsecured obligations | Over 3 years to 4 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 250,000
Carrying amount | 0 | 250,000
Single Series Bond One | Unsecured obligations | Over 4 years to 5 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Single Series Bond One | Unsecured obligations | Over 5 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | $ 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
Bond issuance costs | $ (677) | $ (170)
Single Series Bond Two | Unsecured obligations |  |
Financial instruments [Line Items] |  |
Effective rate | 4.14% | 4.10%
Nominal rate | 4.25% | 4.25%
Notional amount | $ 450,000 | $ 450,000
Carrying amount | 450,000 | 450,000
Bond issuance costs | (2,991) | (3,666)
Total | 447,009 | 446,334
Single Series Bond Two | Unsecured obligations | Over 1 year to 2 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Single Series Bond Two | Unsecured obligations | Over 2 years to 3 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Single Series Bond Two | Unsecured obligations | Over 3 years to 4 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Single Series Bond Two | Unsecured obligations | Over 4 years to 5 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Single Series Bond Two | Unsecured obligations | Over 5 years |  |
Financial instruments [Line Items] |  |
Notional amount | 450,000 | 450,000
Carrying amount | $ 450,000 | $ 450,000
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
Bond issuance costs | $ (235) | $ (679)
Single Series Bond Three | Unsecured obligations |  |
Financial instruments [Line Items] |  |
Effective rate | 4.23% | 4.19%
Nominal rate | 4.25% | 4.25%
Notional amount | $ 400,000 | $ 400,000
Carrying amount | 400,000 | 400,000
Bond issuance costs | (5,879) | (6,112)
Total | 394,121 | 393,888
Single Series Bond Three | Unsecured obligations | Over 1 year to 2 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Single Series Bond Three | Unsecured obligations | Over 2 years to 3 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Single Series Bond Three | Unsecured obligations | Over 3 years to 4 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Single Series Bond Three | Unsecured obligations | Over 4 years to 5 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Single Series Bond Three | Unsecured obligations | Over 5 years |  |
Financial instruments [Line Items] |  |
Notional amount | 400,000 | 400,000
Carrying amount | $ 400,000 | $ 400,000
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
Bond issuance costs | $ (555) | $ (237)
Single Series Bond Four | Unsecured obligations |  |
Financial instruments [Line Items] |  |
Effective rate | 3.45% | 3.42%
Nominal rate | 3.50% | 3.50%
Notional amount | $ 700,000 | $ 700,000
Carrying amount | 700,000 | 700,000
Bond issuance costs | (14,787) | (15,341)
Total | 685,213 | 684,659
Single Series Bond Four | Unsecured obligations | Over 1 year to 2 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Single Series Bond Four | Unsecured obligations | Over 2 years to 3 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Single Series Bond Four | Unsecured obligations | Over 3 years to 4 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Single Series Bond Four | Unsecured obligations | Over 4 years to 5 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Single Series Bond Four | Unsecured obligations | Over 5 years |  |
Financial instruments [Line Items] |  |
Notional amount | 700,000 | 700,000
Carrying amount | $ 700,000 | $ 700,000
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
Bond issuance costs | $ (1,521) | $ (555)
Single Series Bond Five | Unsecured obligations |  |
Financial instruments [Line Items] |  |
Effective rate | 6.89% |
Nominal rate | 6.50% |
Notional amount | $ 750,000 |
Carrying amount | 750,000 |
Bond issuance costs | (13,437) |
Total | 736,563 |
Single Series Bond Five | Unsecured obligations | Over 1 year to 2 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 |
Carrying amount | 0 |
Single Series Bond Five | Unsecured obligations | Over 2 years to 3 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 |
Carrying amount | 0 |
Single Series Bond Five | Unsecured obligations | Over 3 years to 4 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 |
Carrying amount | 0 |
Single Series Bond Five | Unsecured obligations | Over 4 years to 5 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 |
Carrying amount | 0 |
Single Series Bond Five | Unsecured obligations | Over 5 years |  |
Financial instruments [Line Items] |  |
Notional amount | 750,000 |
Carrying amount | $ 750,000 |
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
Bond issuance costs | $ (172) | $ (172)
Series H bonds | Unsecured obligations |  |
Financial instruments [Line Items] |  |
Effective rate | 4.76% | 4.76%
Nominal rate | 4.90% | 4.90%
Notional amount | $ 83,887 | $ 96,967
Carrying amount | 83,887 | 96,967
Bond issuance costs | (861) | (1,034)
Total | 83,026 | 95,933
Series H bonds | Unsecured obligations | Over 1 year to 2 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Series H bonds | Unsecured obligations | Over 2 years to 3 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Series H bonds | Unsecured obligations | Over 3 years to 4 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Series H bonds | Unsecured obligations | Over 4 years to 5 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Series H bonds | Unsecured obligations | Over 5 years |  |
Financial instruments [Line Items] |  |
Notional amount | 83,887 | 96,967
Carrying amount | $ 83,887 | $ 96,967
Series O bonds |  |
Financial instruments [Line Items] |  |
Effective rate | 1.68% | 1.89%
Nominal rate | 3.80% | 3.80%
Notional amount | $ 987 | $ 965
Bond issuance costs | $ (82) | $ (82)
Series O bonds | Unsecured obligations |  |
Financial instruments [Line Items] |  |
Effective rate | 3.69% | 3.69%
Nominal rate | 3.80% | 3.80%
Notional amount | $ 62,915 | $ 61,536
Carrying amount | 62,915 | 61,536
Bond issuance costs | (659) | (741)
Total | 62,256 | 60,795
Series O bonds | Unsecured obligations | Over 1 year to 2 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Series O bonds | Unsecured obligations | Over 2 years to 3 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Series O bonds | Unsecured obligations | Over 3 years to 4 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Series O bonds | Unsecured obligations | Over 4 years to 5 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Series O bonds | Unsecured obligations | Over 5 years |  |
Financial instruments [Line Items] |  |
Notional amount | 62,915 | 61,536
Carrying amount | $ 62,915 | $ 61,536
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
Bond issuance costs | $ (12) | $ (12)
Series P bonds | Unsecured obligations |  |
Financial instruments [Line Items] |  |
Effective rate | 3.24% | 3.24%
Nominal rate | 3.25% | 3.25%
Notional amount | $ 125,830 | $ 123,072
Carrying amount | 125,830 | 123,072
Bond issuance costs | (40) | (52)
Total | 125,790 | 123,020
Series P bonds | Unsecured obligations | Over 1 year to 2 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Series P bonds | Unsecured obligations | Over 2 years to 3 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Series P bonds | Unsecured obligations | Over 3 years to 4 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Series P bonds | Unsecured obligations | Over 4 years to 5 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Series P bonds | Unsecured obligations | Over 5 years |  |
Financial instruments [Line Items] |  |
Notional amount | 125,830 | 123,072
Carrying amount | $ 125,830 | $ 123,072
Series Q bonds |  |
Financial instruments [Line Items] |  |
Effective rate | 2.41% | 2.63%
Nominal rate | 3.45% | 3.45%
Notional amount | $ 359 | $ 351
Bond issuance costs | $ (21) | $ (20)
Series Q bonds | Unsecured obligations |  |
Financial instruments [Line Items] |  |
Effective rate | 3.54% | 3.43%
Nominal rate | 3.45% | 3.45%
Notional amount | $ 125,830 | $ 123,073
Carrying amount | 125,830 | 123,073
Bond issuance costs | (287) | (309)
Total | 125,543 | 122,764
Series Q bonds | Unsecured obligations | Over 1 year to 2 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Series Q bonds | Unsecured obligations | Over 2 years to 3 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Series Q bonds | Unsecured obligations | Over 3 years to 4 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Series Q bonds | Unsecured obligations | Over 4 years to 5 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Series Q bonds | Unsecured obligations | Over 5 years |  |
Financial instruments [Line Items] |  |
Notional amount | 125,830 | 123,073
Carrying amount | $ 125,830 | $ 123,073

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