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Inventories
3 Months Ended
Mar. 31, 2023
Inventory Disclosure [Abstract]  
Inventories Inventories
Inventories in the accompanying Consolidated Balance Sheets consisted of the following amounts as of March 31, 2023 and December 31, 2022 (in thousands):
March 31,
2023
December 31,
2022
Raw materials and construction materials$85,987 $74,014 
Work in process14,418 11,627 
Inventories$100,405 $85,641 
The increase in inventories as of March 31, 2023, compared to December 31, 2022, was a result of: (a) advanced purchases of materials and equipment for use on specific construction projects, in an effort to mitigate the impact of increased lead times, which have resulted from supply chain disruptions, and (b) an increase in raw materials on hand to support our fabrication facilities given the growth in demand for our fire protection services.