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Supplemental cash flow information - Reconciliation of Liabilities (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2019
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Lease obligation recognized on adoption of IFRS16 |  |  | $ 452,882
Changes from financing cash flows |  |  |
Repayment of long-term debt and financing fees | $ (388,216) | $ (213,622) |
Proceeds from limited recourse debt | 695,533 | 0 |
Payment of lease obligations | (101,812) | (8,293) |
Long term debt |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Outstanding at beginning of period | 1,458,286 |  |
Changes from financing cash flows |  |  |
Repayment of long-term debt and financing fees | (388,216) |  |
Proceeds from limited recourse debt | 695,533 |  |
Payment of lease obligations | 0 |  |
Total changes from financing cash flows | 307,317 |  |
Liability-related other changes |  |  |
Finance costs | 3,250 |  |
New lease obligations | 0 |  |
Other | 0 |  |
Total liability-related other changes | 3,250 |  |
Outstanding at end of period | 1,768,853 | 1,458,286 |
Lease obligations |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Outstanding at beginning of period | 199,760 |  |
Changes from financing cash flows |  |  |
Repayment of long-term debt and financing fees | 0 |  |
Proceeds from limited recourse debt | 0 |  |
Payment of lease obligations | (101,812) |  |
Total changes from financing cash flows | (101,812) |  |
Liability-related other changes |  |  |
Finance costs | 0 |  |
New lease obligations | 168,216 |  |
Other | (541) |  |
Total liability-related other changes | 167,675 |  |
Outstanding at end of period | $ 718,505 | $ 199,760 |

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