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Revenue - Contract balances (Details) - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Revenue from Contract with Customer [Abstract] |  |
Contract assets | $ 7,034 | $ 19,193
Contract liabilities | 1,512 | 23
Contract Assets [Roll Forward] |  |
Balance, beginning of year | 19,193 | 10,673
Transferred to receivables from contract assets recognized at the beginning of the period | (16,516) | (10,276)
Decreases due to derecognition of unpriced contract modifications | (2,677) | 0
Increases as a result of changes to the estimate of the stage of completion, excluding amounts transferred in the period | 6,909 | 14,892
Increases as a result of work completed, but not yet an unconditional right to consideration | 125 | 5,736
Decreases due to effect of change in presentation of NL Partnership | 0 | (1,832)
Balance, end of year | 7,034 | 19,193
Contract Liabilities [Roll Forward] |  |
Balance, beginning of year | 23 | 4,032
Revenue recognized that was included in the contract liability balance at the beginning of the period | (23) | (4,031)
Increases due to cash received, excluding amounts recognized as revenue during the period | 1,512 | 174
Decreases due to effect of change in presentation of NL Partnership | 0 | (152)
Balance, end of year | 1,512 | 23
Performance Obligation |  |
Revenue recognized | $ 1,403 | $ 1,857

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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=121604090&loc=SL49130551-203045 + Details
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