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INVENTORIES
 12 Months Ended
Dec. 31, 2023
Inventory Disclosure [Abstract]  
INVENTORIES INVENTORIES
Components of inventories as of December 31, 2023 and December 31, 2022 are as follows: 
 December 31, 2023December 31, 2022
 (In Thousands)
Parts and supplies$42,736 $44,042 
Work in progress2,196 1,860 
Total inventories$44,932 $45,902 

    Inventories consist primarily of compressor package spare parts and supplies. Work in progress inventories consist of work in progress for our aftermarket business that has not been invoiced.