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Inventories (Tables)
9 Months Ended
Sep. 30, 2018
Inventory Disclosure [Abstract]  
Inventories Inventories in the accompanying Condensed Consolidated Balance Sheets consisted of the following amounts (in thousands):
 
September 30,
2018
 
December 31,
2017
Raw materials and construction materials
$
24,924

 
$
23,924

Work in process
17,008

 
18,800

Inventories
$
41,932

 
$
42,724