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Supplemental cash flow information (Tables) | 12 Months Ended
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Dec. 31, 2017
Cash Flow Statement [Abstract] |
Changes in non-cash working capital | Changes in non-cash working capital for the years ended December 31, 2017 and 2016 are as follows:
For the years ended December 31 | 2017 |  | 2016 |
Changes in non-cash working capital: |  |
Trade and other receivables | $ | (37,033 | ) | $ | 4,747 |
Inventories | (23,136 | ) | (28,094 | )
Prepaid expenses | (5,702 | ) | (1,286 | )
Trade, other payables and accrued liabilities, including long-term payables included in other long-term liabilities | 103,601 |  | 14,577 |
| 37,730 |  | (10,056 | )
Adjustments for items not having a cash effect and working capital changes relating to taxes and interest paid | (89,445 | ) | (65,850 | )
Changes in non-cash working capital | $ | (51,715 | ) | $ | (75,906 | )
These changes relate to the following activities: |  |
Operating | $ | (49,368 | ) | $ | (87,644 | )
Financing | — |  | — |
Investing | (2,347 | ) | 11,738 |
Changes in non-cash working capital | $ | (51,715 | ) | $ | (75,906 | )
Reconciliation of liabilities arising from financing activities | Reconciliation of movements in liabilities to cash flows arising from financing activities:
| Long term debt (note 8) |  | Finance lease obligations (note 9) |
Balance at December 31, 2016 | $ | 1,556,206 |  | $ | 201,268 |
Changes from financing cash flows |  |
Repayment of long-term debt and financing fees | (56,997 | ) | — |
Payment of finance lease liabilities | — |  | (6,880 | )
Total changes from financing cash flows | $ | (56,997 | ) | $ | (6,880 | )
Liability-related other changes |  |
Finance costs | $ | 3,062 |  | $ | — |
New finance leases | — |  | 9,512 |
Other | — |  | 342 |
Total liability-related other changes | $ | 3,062 |  | $ | 9,854 |
Balance at December 31, 2017 | $ | 1,502,271 |  | $ | 204,242 |

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