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Inventories (Tables)
9 Months Ended
Sep. 30, 2020
Inventory Disclosure [Abstract]  
Inventories
Inventories in the accompanying Consolidated Balance Sheets consisted of the following amounts as of September 30, 2020 and December 31, 2019 (in thousands):
September 30,
2020
December 31,
2019
Raw materials and construction materials$28,163 $31,365 
Work in process11,090 9,081 
Inventories$39,253 $40,446