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Supplemental cash flow information - Reconciliation of Liabilities (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Changes from financing cash flows |  |
Repayment of long-term debt and financing fees | $ (213,622) | $ (56,997)
Proceeds from limited recourse debt | 166,000 | 0
Payment of finance lease liabilities | (8,293) | (6,880)
Long term debt (note 8) |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |
Outstanding at beginning of period | 1,502,271 |
Changes from financing cash flows |  |
Repayment of long-term debt and financing fees | (213,622) |
Proceeds from limited recourse debt | 166,000 |
Payment of finance lease liabilities | 0 |
Total changes from financing cash flows | (47,622) |
Liability-related other changes |  |
Finance costs | 3,637 |
New finance leases | 0 |
Total liability-related other changes | 3,637 |
Outstanding at end of period | 1,458,286 | 1,502,271
Finance lease obligations (note 9) |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |
Outstanding at beginning of period | 204,242 |
Changes from financing cash flows |  |
Repayment of long-term debt and financing fees | 0 |
Proceeds from limited recourse debt | 0 |
Payment of finance lease liabilities | (8,293) |
Total changes from financing cash flows | (8,293) |
Liability-related other changes |  |
Finance costs | 0 |
New finance leases | 2,425 |
Total liability-related other changes | 2,425 |
Outstanding at end of period | $ 198,374 | $ 204,242

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