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Inventories
3 Months Ended
Mar. 31, 2018
Inventory Disclosure [Abstract]  
Inventories
Inventories
Inventories in the accompanying Condensed Consolidated Balance Sheets consisted of the following amounts (in thousands):
 
March 31,
2018
 
December 31,
2017
Raw materials and construction materials
$
25,017

 
$
23,924

Work in process
18,710

 
18,800

Inventories
$
43,727

 
$
42,724