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Revenue - Contract balances (Details) - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Revenue from Contract with Customer [Abstract] |  |
Contract assets | $ 19,193 | $ 10,673
Contract liabilities | 23 | 4,032
Contract Assets [Roll Forward] |  |
Balance, beginning of period | 10,673 | 21,572
Transferred to receivables from contract assets recognized at the beginning of the period | (10,276) | (14,701)
Increases as a result of changes to the estimate of the stage of completion, excluding amounts transferred in the period | 14,892 | 2,043
Increases as a result of work completed, but not yet an unconditional right to consideration | 5,736 | 409
Increases as a result of Nuna acquisition | 0 | 1,350
Decreases due to effect of change in presentation of NL Partnership | (1,832) | 0
Balance, end of period | 19,193 | 10,673
Contract Liabilities [Roll Forward] |  |
Balance, beginning of period | 4,032 | 824
Revenue recognized that was included in the contract liability balance at the beginning of the period | (4,031) | (84)
Increases due to cash received, excluding amounts recognized as revenue during the period | 174 | 1,379
Increases as a result of Nuna acquisition | 0 | 1,913
Decreases due to effect of change in presentation of NL Partnership | (152) | 0
Balance, end of period | 23 | 4,032
Performance Obligation |  |
Revenue recognized | $ 1,857 | $ 2,516

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- Definition Amount of increase (decrease) in revenue recognized for cumulative catch-up adjustment from change in measure of progress which increases (decreases) right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130551-203045 + Details
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