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Long-term debt - Components of long-term debt (Details) - USD ($) | Dec. 31, 2022 | Dec. 31, 2021
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Disclosure of detailed information about borrowings [line items] |  |
Total long-term debt | $ 2,151,513,000 | $ 2,158,192,000
Less current maturities | (15,133,000) | (11,775,000)
Non-current portion of long-term debt | 2,136,380,000 | 2,146,417,000
Debt discounts and deferred financing fees | 19,400,000 | 21,800,000
Unsecured notes |  |
Disclosure of detailed information about borrowings [line items] |  |
Total long-term debt | 1,983,374,000 | 1,981,199,000
$300 million at 4.25% due December 1, 2024 |  |
Disclosure of detailed information about borrowings [line items] |  |
Total long-term debt | 298,836,000 | 298,408,000
Notional amount | $ 300,000,000 |
$300 million at 4.25% due December 1, 2024 | Fixed interest rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate | 4.25% |
$700 million at 5.125% due October 15, 2027 |  |
Disclosure of detailed information about borrowings [line items] |  |
Total long-term debt | $ 693,649,000 | 692,516,000
Notional amount | $ 700,000,000 |
$700 million at 5.125% due October 15, 2027 | Fixed interest rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate | 5.125% |
$700 million at 5.25% due December 15, 2029 |  |
Disclosure of detailed information about borrowings [line items] |  |
Total long-term debt | $ 695,283,000 | 694,770,000
Notional amount | $ 700,000,000 |
$700 million at 5.25% due December 15, 2029 | Fixed interest rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate | 5.25% |
$300 million at 5.65% due December 1, 2044 |  |
Disclosure of detailed information about borrowings [line items] |  |
Total long-term debt | $ 295,606,000 | 295,505,000
Notional amount | $ 300,000,000 |
$300 million at 5.65% due December 1, 2044 | Fixed interest rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate | 5.65% |
Other limited recourse debt facilities |  |
Disclosure of detailed information about borrowings [line items] |  |
Total long-term debt | $ 168,139,000 | 176,993,000
5.58% due June 30, 2031 |  |
Disclosure of detailed information about borrowings [line items] |  |
Total long-term debt | $ 61,978,000 | 65,745,000
5.58% due June 30, 2031 | Fixed interest rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate | 5.58% |
5.35% due September 30, 2033 |  |
Disclosure of detailed information about borrowings [line items] |  |
Total long-term debt | $ 70,312,000 | 73,836,000
5.35% due September 30, 2033 | Fixed interest rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate | 5.35% |
5.08% due September 15, 2036 |  |
Disclosure of detailed information about borrowings [line items] |  |
Total long-term debt | $ 35,849,000 | $ 37,412,000
5.08% due September 15, 2036 | Fixed interest rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate | 5.08% |

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