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Costs incurred and estimated earnings net of billings on uncompleted contracts
 12 Months Ended
Dec. 31, 2017
Contractors [Abstract]  
Costs incurred and estimated earnings net of billings on uncompleted contracts
Costs incurred and estimated earnings net of billings on uncompleted contracts
 
 
December 31, 2017

 
December 31, 2016

Costs incurred and estimated earnings on uncompleted contracts
 
$
199,863

 
$
208,030

Less billings to date
 
(179,800
)
 
(193,136
)
 
 
$
20,063

 
$
14,894


Costs incurred and estimated earnings net of billings on uncompleted contracts is presented in the Consolidated Balance Sheets under the following captions:
 
 
December 31, 2017

 
December 31, 2016

Unbilled revenue
 
$
21,572

 
$
15,965

Billings in excess of costs incurred and estimated earnings on uncompleted contracts
 
(824
)
 
(1,071
)
 
 
$
20,748

 
$
14,894


Unbilled revenue related to non-construction activities amounted to $685 (December 31, 2016 - $nil).