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Other information | 12 Months Ended
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Dec. 31, 2017
Supplemental Cash Flow Elements [Abstract] |
Other information | Other information a) Supplemental cash flow information
Year ended December 31, |  | 2017 |  |  | 2016 |
Cash paid during the year for: |  |  |  |
Interest |  | $ | 5,615 |  |  | $ | 5,895 |
Cash received during the year for: |  |  |  |
Interest |  | 162 |  |  | 194 |
Year ended December 31, |  | 2017 |  |  | 2016 |
Non-cash transactions: |  |  |  |
Addition of property, plant and equipment by means of capital leases |  | 34,730 |  |  | 23,490 |
Acquisition of property, plant and equipment related to the initial investment in the partnership |  | 2,581 |  |  | — |
Increase in capital lease obligations related to the initial investment in the partnership |  | 800 |  |  | — |
Increase in long term debt related to the initial investment in the partnership |  | 637 |  |  | — |
Reclass from property, plant and equipment to assets held for sale |  | (6,869 | ) |  | (1,374 | )
Non-cash working capital exclusions: |  |  |  |
Increase in inventory related to the initial partnership investment |  | (29 | ) |  | — |
Increase in prepaid expenses related to the initial investment in the partnership |  | (4 | ) |  | — |
Decrease in inventory related to a non-monetary transaction |  | — |  |  | (575 | )
Increase in accrued liabilities related to the current portion of the deferred gain on sale-leaseback |  | 859 |  |  | 365 |
Net decrease in accrued liabilities related to current portion of RSU liability |  | — |  |  | (671 | )
Net (decrease) increase in accrued liabilities related to dividend payable |  | (59 | ) |  | 569 |
b) Net change in non-cash working capital The table below represents the cash (used in) provided by non-cash working capital:
Year ended December 31, |  | 2017 |  |  | 2016 |
Operating activities: |  |  |  |
Accounts receivable |  | $ | (7,148 | ) |  | $ | (15,344 | )
Unbilled revenue |  | (5,607 | ) |  | 1,600 |
Inventories |  | (1,288 | ) |  | (1,437 | )
Prepaid expenses and deposits |  | (283 | ) |  | 126 |
Accounts payable |  | 5,640 |  |  | 4,517 |
Accrued liabilities |  | 1,904 |  |  | 4,144 |
Billings in excess of costs incurred and estimated earnings on uncompleted contracts |  | (247 | ) |  | 614 |
|  | $ | (7,029 | ) |  | $ | (5,780 | )

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- Definition The entire disclosures of supplemental information, including descriptions and amounts, related to the balance sheet, income statement, and/or cash flow statement. + References No definition available. + Details
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