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Other information | 12 Months Ended
--- | ---
Dec. 31, 2019
Supplemental Cash Flow Elements [Abstract] |
Other information | Other information a) Supplemental cash flow information
Year ended December 31, |  | 2019 |  |  | 2018 |
Cash paid during the year for: |  |  |  |
Interest |  | $ | 20,039 |  |  | $ | 9,258 |
Operating leases included in cash from operations |  | 4,435 |  |  | — |
Cash received during the year for: |  |  |  |
Interest |  | 72 |  |  | 41 |
Operating subleases included in cash from operations |  | 3,074 |  |  | — |
Non-cash transactions: |  |  |  |
Addition of property, plant and equipment by means of finance leases |  | 28,107 |  |  | 49,440 |
Net increase (decrease) in assets held for sale, offset by property, plant and equipment |  | 4,230 |  |  | (53 | )
Increase in finance lease obligations related to purchase of heavy equipment fleet and related assets |  | — |  |  | 1,759 |
Increase in finance lease obligations related to investment in affiliates and joint ventures |  | — |  |  | 542 |
Increase in promissory notes related to purchase of heavy equipment fleet and related assets |  | — |  |  | 10,851 |
Increase in long-term debt related to investment in affiliates and joint ventures |  | — |  |  | 3,127 |
Non-cash working capital exclusions: |  |  |  |
Net decrease in contract assets related to adoption of revenue accounting standard |  | — |  |  | (547 | )
Increase in inventory related to the purchase of heavy equipment fleet and related assets |  | — |  |  | 4,268 |
Net increase in other assets related to adoption of revenue accounting standard |  | — |  |  | 502 |
Net decrease in accrued liabilities related to conversion of bonus compensation to deferred stock units |  | 428 |  |  | 326 |
Net decrease in long-term portion of payroll liabilities |  | 536 |  |  | — |
Net decrease in other accrued liabilities |  | 582 |  |  | — |
Net (increase) decrease in accrued liabilities related to dividend payable |  | (530 | ) |  | 10 |
Non-cash working capital transactions related to investments in affiliates and joint ventures: |  |  |  |
(Decrease) increase in accounts receivable |  | (10,260 | ) |  | 13,234 |
(Decrease) increase in contract assets |  | (1,832 | ) |  | 3,089 |
(Decrease) increase in inventory |  | (4,321 | ) |  | 3,926 |
(Decrease) increase in prepaid expenses |  | (341 | ) |  | 399 |
Decrease in contract costs |  | (349 | ) |  | — |
Decrease (increase) in accounts payable |  | 3,859 |  |  | (10,604 | )
Decrease (increase) in accrued liabilities |  | 1,615 |  |  | (1,136 | )
Decrease (increase) in contract liabilities |  | 152 |  |  | (360 | )
b) Net change in non-cash working capital The table below represents the cash provided by (used in) non-cash working capital:
Year ended December 31, |  | 2019 |  |  | 2018 |
Operating activities: |  |  |  |
Accounts receivable |  | $ | 5,393 |  |  | $ | (22,359 | )
Contract assets |  | (10,352 | ) |  | 13,441 |
Inventories |  | (12,579 | ) |  | (443 | )
Contract costs |  | 943 |  |  | (1,384 | )
Prepaid expenses and deposits |  | (663 | ) |  | (1,513 | )
Accounts payable |  | 28,600 |  |  | 17,665 |
Accrued liabilities |  | 1,034 |  |  | 5,923 |
Contract liabilities |  | (3,857 | ) |  | 2,848 |
|  | $ | 8,519 |  |  | $ | 14,178 |

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