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Inventories (Tables)
9 Months Ended
Sep. 30, 2016
Inventory Disclosure [Abstract]  
Inventories
Inventories in the accompanying Condensed Consolidated Balance Sheets consisted of the following amounts (in thousands):
 
 
September 30,
2016
 
December 31,
2015
Raw materials and construction materials
$
24,144

 
$
23,239

Work in process
19,769

 
14,306

 
$
43,913

 
$
37,545