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Other information (Tables) | 12 Months Ended
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Dec. 31, 2017
Supplemental Cash Flow Elements [Abstract] |
Schedule of 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 |
Schedule of non-cash transactions |
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 |
Schedule of 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 Tabular disclosure of the net increase (decrease) in operating capital in the operating section of the statement of cash flows, represents the entire footnote disclosure that provides details regarding the net change during the reporting period of all assets and liabilities used in operating activities. + References No definition available. + Details
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- Definition Tabular disclosure of noncash investing and financing activities, classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details
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