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Other information - Non-cash (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 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 0
Increase in capital lease obligations related to investment in affiliates and joint ventures 542 0
Increase in capital lease obligations related to the initial investment in the partnership 0 800
Increase in equipment promissory notes related to purchase of heavy equipment fleet and related assets 10,851 0
Acquisition of property, plant and equipment related to the initial investment in the partnership 0 2,581
Increase in long term debt related to investment in affiliates and joint ventures 0 637
Increase in long term debt related to investment in affiliates and joint ventures 3,127 0
Non-cash working capital exclusions:    
Decrease in contract assets related to adoption of accounting standards (547) 0
Increase in inventory related to the initial partnership investment 0 29
Increase in inventory related to the purchase of heavy equipment fleet and related assets 4,268 0
Increase in prepaid expenses related to the initial investment in the partnership 0 4
Increase in other assets related to adoption of accounting standards 502 0
Increase in accrued liabilities related to the current portion of the deferred gain on sale-leaseback 0 (859)
Decrease in accrued liabilities related to conversion of bonus compensation to deferred stock units 326 0
Decrease in accrued liabilities related to dividend payable 10 59
Increase in accounts receivable 13,234 0
Increase in contract assets 3,089 0
Increase in inventory 3,926 0
Increase in prepaid expenses 399 0
Increase in accounts payable (10,604) 0
Increase in accrued liabilities (1,136) 0
Increase in contract liabilities (360) 0
Operating activities:    
Accounts receivable (22,359) (7,148)
Contract assets 13,441 (5,607)
Inventories (443) (1,288)
Contract costs (1,384) 0
Prepaid expenses and deposits (1,513) (283)
Accounts payable 17,665 5,640
Accrued liabilities 5,923 1,904
Contract liabilities 2,848 (247)
Net changes in non-cash working capital $ 14,178 $ (7,029)