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Costs incurred and estimated earnings net of billings on uncompleted contracts
 12 Months Ended
Dec. 31, 2014
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, 2014

 
December 31, 2013

Costs incurred and estimated earnings on uncompleted contracts
 
$
629,416

 
$
533,837

Less billings to date
 
(585,794
)
 
(508,026
)
 
 
$
43,622

 
$
25,811


Costs incurred and estimated earnings net of billings on uncompleted contracts is presented in the Consolidated Balance Sheets under the following captions:
 
 
December 31, 2014

 
December 31, 2013

Unbilled revenue
 
$
43,622

 
$
32,168

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

 
(6,357
)
 
 
$
43,622

 
$
25,811