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Other long-term liabilities - Preferred Shares, Series C (Details) $ in Thousands | Dec. 31, 2020 USD ($) shares | Dec. 31, 2020 $ / shares | Dec. 31, 2019 USD ($)
--- | --- | --- | ---
Class of Stock [Line Items] |  |  |
2021 | $ 334,352 |  |
2022 | 422,609 |  |
2023 | 111,427 |  |
2024 | 240,151 |  |
2025 | 45,451 |  |
Thereafter to 2031 | 3,380,045 |  |
Total Preferred shares series C | $ 13,698 |  | $ 13,793
Series C Preferred Stock |  |  |
Class of Stock [Line Items] |  |  |
Redeemable preferred stock issued, shares | shares | 100 |  |
Preferred stock redemption price per share (in CAD per share) | $ / shares |  | $ 53,400 |
Series C Preferred Stock | Dividends Payable |  |  |
Class of Stock [Line Items] |  |  |
2021 | $ 1,075 |  |
2022 | 1,097 |  |
2023 | 1,324 |  |
2024 | 1,536 |  |
2025 | 1,552 |  |
Thereafter to 2031 | 7,693 |  |
Redemption amount | 4,195 |  |
Estimated dividend and redemption payments | 18,472 |  |
Less amounts representing interest | (4,774) |  |
Total Preferred shares series C | 13,698 |  |
Less current portion | (1,075) |  |
Preferred shares series C, noncurrent | $ 12,623 |  |

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