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Inventories | 12 Months Ended
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Dec. 31, 2023
Inventory Disclosure [Abstract] |
Inventories | INVENTORIES Inventories in the accompanying Consolidated Balance Sheets consisted of the following amounts as of December 31, 2023 and 2022 (in thousands):
| December 31, 2023 |  | December 31, 2022
Raw materials and construction materials | $ | 94,447 |  |  | $ | 74,014 |
Work in process | 16,327 |  |  | 11,627 |
Inventories | $ | 110,774 |  |  | $ | 85,641 |
The increase in inventories as of December 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, (b) an increase in raw materials on hand to support our fabrication facilities given the growth in demand for our fire protection services, and (c) higher levels of work in process inventory within our United States industrial services segment given greater new build heat exchanger orders.

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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 -Topic 330 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//330/tableOfContent + Details
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