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Inventories
12 Months Ended
Dec. 31, 2016
Inventory Disclosure [Abstract]  
Inventories
INVENTORIES
Inventories as of December 31, 2016 and 2015 consist of the following amounts (in thousands):
 
 
2016
 
2015
Raw materials and construction materials
$
21,997

 
$
23,239

Work in process
15,429

 
14,306

 
$
37,426

 
$
37,545