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Costs incurred and estimated earnings net of billings on uncompleted contracts (Tables)
 12 Months Ended
Dec. 31, 2017
Contractors [Abstract]  
Schedule of costs in excess 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