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Other information | 12 Months Ended
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Dec. 31, 2018
Supplemental Cash Flow Elements [Abstract] |
Other information | Other information a) Supplemental cash flow information
Year ended December 31, |  | 2018 |  |  | 2017 |
Cash paid during the year for: |  |  |  |
Interest |  | $ | 9,258 |  |  | $ | 5,615 |
Cash received during the year for: |  |  |  |
Interest |  | 41 |  |  | 162 |
Year ended December 31, |  | 2018 |  |  | 2017 |
Non-cash transactions: |  |  |  |
Addition of property, plant and equipment by means of capital leases |  | 49,440 |  |  | 34,730 |
Property, plant and equipment reclassified to asset held for sale |  | (53 | ) |  | (6,869 | )
Increase in capital lease obligations related to purchase of heavy equipment fleet and related assets |  | 1,759 |  |  | — |
Increase in capital lease obligations related to investment in affiliates and joint ventures |  | 542 |  |  | — |
Increase in capital lease obligations related to the initial investment in the partnership |  | — |  |  | 800 |
Increase in equipment promissory notes related to purchase of heavy equipment fleet and related assets |  | 10,851 |  |  | — |
Acquisition of property, plant and equipment related to the initial investment in the partnership |  | — |  |  | 2,581 |
Increase in long term debt related to the initial investment in the partnership |  | — |  |  | 637 |
Increase in long term debt related to investment in affiliates and joint ventures |  | 3,127 |  |  | — |
Non-cash working capital exclusions: |  |  |  |
Decrease in contract assets related to adoption of accounting standards |  | (547 | ) |  | — |
Increase in inventory related to the initial partnership investment |  | — |  |  | 29 |
Increase in inventory related to the purchase of heavy equipment fleet and related assets |  | 4,268 |  |  | — |
Increase in prepaid expenses related to the initial investment in the partnership |  | — |  |  | 4 |
Increase in other assets related to adoption of accounting standards |  | 502 |  |  | — |
Increase in accrued liabilities related to the current portion of the deferred gain on sale-leaseback |  | — |  |  | (859 | )
Decrease in accrued liabilities related to conversion of bonus compensation to deferred stock units |  | 326 |  |  | — |
Decrease in accrued liabilities related to dividend payable |  | 10 |  |  | 59 |
Non-cash working capital transactions related to investments in affiliates and joint ventures: |  |  |  |
Increase in accounts receivable |  | 13,234 |  |  | — |
Increase in contract assets |  | 3,089 |  |  | — |
Increase in inventory |  | 3,926 |  |  | — |
Increase in prepaid expenses |  | 399 |  |  | — |
Increase in accounts payable |  | (10,604 | ) |  | — |
Increase in accrued liabilities |  | (1,136 | ) |  | — |
Increase in contract liabilities |  | (360 | ) |  | — |
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, |  | 2018 |  |  | 2017 |
Operating activities: |  |  |  |
Accounts receivable |  | $ | (22,359 | ) |  | $ | (7,148 | )
Contract assets |  | 13,441 |  |  | (5,607 | )
Inventories |  | (443 | ) |  | (1,288 | )
Contract costs |  | (1,384 | ) |  | — |
Prepaid expenses and deposits |  | (1,513 | ) |  | (283 | )
Accounts payable |  | 17,665 |  |  | 5,640 |
Accrued liabilities |  | 5,923 |  |  | 1,904 |
Contract liabilities |  | 2,848 |  |  | (247 | )
|  | $ | 14,178 |  |  | $ | (7,029 | )

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