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Inventories | 12 Months Ended
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Dec. 31, 2022
Inventory Disclosure [Abstract] |
Inventories | INVENTORIES Inventories in the accompanying Consolidated Balance Sheets consisted of the following amounts as of December 31, 2022 and 2021 (in thousands):
| December 31, 2022 |  | December 31, 2021
Raw materials and construction materials | $ | 74,014 |  |  | $ | 46,186 |
Work in process | 11,627 |  |  | 7,912 |
Inventories | $ | 85,641 |  |  | $ | 54,098 |
The increase in inventories as of December 31, 2022, compared to December 31, 2021, 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 extended 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.

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- Definition The entire disclosure for inventory. Includes, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the classes of inventory, and the nature of the cost elements included in inventory. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -URI https://asc.fasb.org/topic&trid=2126998 + Details
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