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Inventories
3 Months Ended
Mar. 31, 2017
Inventory Disclosure [Abstract]  
Inventories
Inventories
Inventories in the accompanying Condensed Consolidated Balance Sheets consisted of the following amounts (in thousands):
 
March 31,
2017
 
December 31,
2016
Raw materials and construction materials
$
23,078

 
$
21,997

Work in process
19,594

 
15,429

 
$
42,672

 
$
37,426