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Contracts in Progress (Tables)
 12 Months Ended
Dec. 31, 2017
Contractors [Abstract]  
Contracts in progress
Contracts in progress are as follows at December 31, 2017 and December 31, 2016:
 
December 31,
2017
 
December 31,
2016
Costs incurred on uncompleted contracts
$
668,848

 
$
802,140

Estimated earnings
120,751

 
143,975

 
789,599

 
946,115

Less: Billings to date
(777,516
)
 
(933,828
)
 
$
12,083

 
$
12,287

Included in the accompanying consolidated balance sheets under the following captions:
 

 
 

Costs and estimated earnings in excess of billings on uncompleted contracts
46,006

 
$
39,968

Billings in excess of costs and estimated earnings on uncompleted contracts
(33,923
)
 
(27,681
)
 
$
12,083

 
$
12,287