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Costs incurred and estimated earnings net of billings on uncompleted contracts
 12 Months Ended
Dec. 31, 2016
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, 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