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Construction Contracts (Tables)
 12 Months Ended
Dec. 31, 2017
Contractors [Abstract]  
Net position of uncompleted construction contracts
The Company’s net position on uncompleted construction contracts comprised the following as of December 31, 2017 and 2016 (in thousands):
 
 
December 31, 
 
2017
 
2016
Costs incurred on uncompleted construction contracts
$
520,368

 
$
333,744

Estimated earnings
18,070

 
10,936

Billings
(541,784
)
 
(354,737
)
Net position
$
(3,346
)
 
$
(10,057
)
 
 
December 31,
 
2017
 
2016
Construction contract costs and estimated earnings in excess of billings
$
245

 
$
110

Billings in excess of construction contract costs and estimated earnings
(3,591
)
 
(10,167
)
Net position
$
(3,346
)
 
$
(10,057
)