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Revenue
 12 Months Ended
Dec. 31, 2020
Revenue from Contract with Customer [Abstract]  
Revenue Revenue
a) Disaggregation of revenue
Year ended December 31,20202019
Revenue by source
Operations support services$493,407 $586,757 
Construction services6,967 132,310 
 $500,374 $719,067 
By commercial terms
Time-and-materials$263,854 $343,156 
Unit-price225,667 375,911 
Lump-sum10,853 — 
 $500,374 $719,067 
Revenue recognition method
As-invoiced$341,999 $467,013 
Cost-to-cost percent complete158,375 252,054 
 $500,374 $719,067 
b) Contract balances
 December 31,
2020		December 31, 2019
Contract assets$7,034 $19,193 
Contract liabilities1,512 23 
The following table provides information about significant changes in the contract assets:
Year ended December 31,20202019
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)— 
Increases as a result of changes to the estimate of the stage of completion, excluding amounts transferred in the period6,909 14,892 
Increases as a result of work completed, but not yet an unconditional right to consideration125 5,736 
Decreases due to effect of change in presentation of NL Partnership— (1,832)
Balance, end of year$7,034 $19,193 
The following table provides information about significant changes in the contract liabilities:
Year ended December 31,20202019
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 period1,512 174 
Decreases due to effect of change in presentation of NL Partnership— (152)
Balance, end of year$1,512 $23 
The following table provides information about revenue recognized from performance obligations that were satisfied (or partially satisfied) in previous periods:
Year ended December 31,20202019
Revenue recognized
$1,403 $1,857 
These amounts relate to cumulative catch-up adjustments arising from changes in estimated project costs on cost-to-cost percent complete jobs and final settlement of constrained variable consideration.
c) Unpriced contract modifications
The Company recognized revenue from variable consideration related to unpriced contract modifications for the year ended December 31, 2020 of $nil (December 31, 2019 - $4,936).
The Company has recorded amounts in contract assets related to uncollected consideration from revenue recognized on unpriced contract modifications as at December 31, 2020 of $nil (December 31, 2019 - $5,312).
The change in unpriced contract modifications during the year ended December 31, 2020 was largely due to resolved unpriced contract modifications.
d) Transaction price allocated to the remaining performance obligations
The following table includes estimated revenue expected to be recognized in the future related to performance obligations that are unsatisfied (or partially unsatisfied) at the end of the reporting period. Included is all consideration from contracts with customers, excluding amounts that are recognized using the as-invoiced method and any constrained amounts of revenue.
For the year ended December 31,
2021$87,289 
202211,717 
202311,717 
20249,270 
20256,823 
$126,816 
e) Contract costs
The following table summarizes contract costs included within other assets on the Consolidated Balance Sheets.
 December 31,
2020		December 31, 2019
Fulfillment costs$1,432 $1,016 
Reimbursable bid costs537 — 
$1,969 $1,016 
During the year ended December 31, 2020, fulfillment costs of $2,256 were capitalized and reimbursable bid costs of $537 were capitalized (December 31, 2019 - $1,016 and $nil, respectively).