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Long-term debt (Tables) | 12 Months Ended
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Dec. 31, 2021
Financial Instruments [Abstract] |
Schedule of long-term debt |
As at | Dec 31 2021 | Dec 31 2020 |
Unsecured notes |  |  |
(i) $300 million at 4.25% due December 1, 2024 | $ | 298,408 |  | $ | 297,999 |  |
(ii) $700 million at 5.125% due October 15, 2027 | 692,516 |  | 691,434 |  |
(iii) $700 million at 5.25% due December 15, 2029 | 694,770 |  | 694,282 |  |
(iv) $300 million at 5.65% due December 1, 2044 | 295,505 |  | 295,410 |  |
| 1,981,199 |  | 1,979,125 |  |
Geismar 3 construction facility at LIBOR+3% | — |  | 176,335 |  |
Egypt limited recourse debt facilities | — |  | 46,948 |  |
Other limited recourse debt facilities |  |  |
(i) 5.58% due through June 30, 2031 | 65,745 |  | 69,734 |  |
(ii) 5.35% due through September 30, 2033 | 73,836 |  | 78,391 |  |
(iii) 5.08% due through September 15, 2036 | 37,412 |  | 12,839 |  |
| 176,993 |  | 160,964 |  |
Total long-term debt 1 | 2,158,192 |  | 2,363,372 |  |
Less current maturities 1 | (11,775) |  | (39,771) |  |
| $ | 2,146,417 |  | $ | 2,323,601 |  |
1 Long-term debt and current maturities are presented net of discounts and deferred financing fees of $21.8 million as at December 31, 2021 (2020 - $25.4 million).
Schedule of minimum principal payments for long-term debt | The gross minimum principal payments for long-term debt in aggregate and for each of the five succeeding years are as follows:
| Other limited recourse debt facilities | Unsecured notes | Total
2022 | $ | 11,775 | $ | — |  | $ | 11,775
2023 | 12,424 | — |  | 12,424
2024 | 12,576 | 300,000 |  | 312,576
2025 | 13,654 | — |  | 13,654
2026 | 13,785 | — |  | 13,785
Thereafter | 115,793 | 1,700,000 |  | 1,815,793
| $ | 180,007 | $ | 2,000,000 |  | $ | 2,180,007

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