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Inventories (Tables)
3 Months Ended
Mar. 31, 2019
Inventory Disclosure [Abstract]  
Inventories Inventories in the accompanying Consolidated Balance Sheets consisted of the following amounts (in thousands):
 
March 31,
2019
 
December 31,
2018
Raw materials and construction materials
$
29,878

 
$
30,006

Work in process
9,565

 
12,315

Inventories
$
39,443

 
$
42,321