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Costs incurred and estimated earnings net of billings on uncompleted contracts (Tables)
 12 Months Ended
Dec. 31, 2016
Contractors [Abstract]  
Schedule of costs in excess of billings on uncompleted contracts
 
 
December 31, 2016

 
December 31, 2015

Costs incurred and estimated earnings on uncompleted contracts
 
$
208,030

 
$
275,316

Less billings to date
 
(193,136
)
 
(258,208
)
 
 
$
14,894

 
$
17,108


Costs incurred and estimated earnings net of billings on uncompleted contracts is presented in the Consolidated Balance Sheets under the following captions:
 
 
December 31, 2016

 
December 31, 2015

Unbilled revenue
 
$
15,965

 
$
17,565

Billings in excess of costs incurred and estimated earnings on uncompleted contracts
 
(1,071
)
 
(457
)
 
 
$
14,894

 
$
17,108