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Costs incurred and estimated earnings net of billings on uncompleted contracts
 12 Months Ended
Dec. 31, 2015
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, 2015

 
December 31, 2014

Costs incurred and estimated earnings on uncompleted contracts
 
$
275,316

 
$
629,416

Less billings to date
 
(258,208
)
 
(585,794
)
 
 
$
17,108

 
$
43,622


Costs incurred and estimated earnings net of billings on uncompleted contracts is presented in the Consolidated Balance Sheets under the following captions:
 
 
December 31, 2015

 
December 31, 2014

Unbilled revenue
 
$
17,565

 
$
43,622

Billings in excess of costs incurred and estimated earnings on uncompleted contracts
 
(457
)
 
—

 
 
$
17,108

 
$
43,622