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Financial instruments and risk management - Maximum credit exposure (Details) - CAD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Fair Value Disclosures [Abstract] |  |
Trade accounts receivable | $ 67,913 | $ 45,158
Holdbacks | 558 | 558
Other receivables | 4,121 | 1,090
Accrued trade receivables | 9,807 | 0
Total accounts receivable | 82,399 | 46,806
Contract assets | 10,673 | 21,572
Total | $ 93,072 | $ 68,378

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- Definition Amounts due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer) for goods or services (including trade receivables) that have been delivered or sold in the normal course of business. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(5)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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