XML 73 R51.htm IDEA: XBRL DOCUMENT v3.20.4
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