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Construction Contracts in Progress (Tables)
 12 Months Ended
Dec. 31, 2017
LongTermContractsOrProgramsDisclosureTextBlockAbstract  
Contracts in Progress
The status of contracts in progress as of December 31, 2017 and 2016 is as follows:
 
 
2017
 
2016
Costs incurred on uncompleted contracts
 
$
101,600

 
$
111,925

Estimated earnings
 
49,561

 
55,527

Earned revenue
 
151,161

 
167,452

Less billings to date
 
(145,670
)
 
(162,427
)
Total
 
$
5,491

 
$
5,025

Classified as follows:
 
 
 
 
Costs and estimated earnings in excess of billings on uncompleted contracts
 
$
7,894

 
$
6,755

Billings in excess of costs and estimated earnings on uncompleted contracts
 
(2,403
)
 
(1,730
)
Total
 
$
5,491

 
$
5,025