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Inventories (Tables)
6 Months Ended
Jun. 30, 2021
Inventory Disclosure [Abstract]  
Inventories
Inventories in the accompanying Consolidated Balance Sheets consisted of the following amounts as of June 30, 2021 and December 31, 2020 (in thousands):
June 30,
2021
December 31,
2020
Raw materials and construction materials$47,861 $42,240 
Work in process16,852 11,098 
Inventories$64,713 $53,338