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Inventories
9 Months Ended
Sep. 30, 2019
Inventory Disclosure [Abstract]  
Inventories Inventories
Inventories in the accompanying Consolidated Balance Sheets consisted of the following amounts (in thousands):
 
September 30,
2019
 
December 31,
2018
Raw materials and construction materials
$
29,829

 
$
30,006

Work in process
8,892

 
12,315

Inventories
$
38,721

 
$
42,321