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Supplemental cash flow information - Reconciliation of Liabilities (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Changes from financing cash flows |  |
Repayment of long-term debt and financing fees | $ (56,997) | $ (48,417)
Payment of finance lease liabilities | (6,880) | (5,144)
Long term debt (note 8) |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |
Outstanding at beginning of period | 1,556,206 |
Changes from financing cash flows |  |
Repayment of long-term debt and financing fees | (56,997) |
Payment of finance lease liabilities | 0 |
Total changes from financing cash flows | (56,997) |
Liability-related other changes |  |
Finance costs | 3,062 |
New finance leases | 0 |
Other | 0 |
Total liability-related other changes | 3,062 |
Outstanding at end of period | 1,502,271 | 1,556,206
Finance lease obligations (note 9) |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |
Outstanding at beginning of period | 201,268 |
Changes from financing cash flows |  |
Repayment of long-term debt and financing fees | 0 |
Payment of finance lease liabilities | (6,880) |
Total changes from financing cash flows | (6,880) |
Liability-related other changes |  |
Finance costs | 0 |
New finance leases | 9,512 |
Other | 342 |
Total liability-related other changes | 9,854 |
Outstanding at end of period | $ 204,242 | $ 201,268

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