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Inventories
 6 Months Ended
Jun. 30, 2021
Inventory Disclosure [Abstract]  
Inventories INVENTORIES
Components of inventories as of June 30, 2021 and December 31, 2020 are as follows: 
 June 30, 2021December 31, 2020
 (In Thousands)
Finished goods$59,814 $68,121 
Raw materials3,783 2,910 
Parts and supplies4,554 4,001 
Work in progress1,920 1,626 
Total inventories
$70,071 $76,658 
Finished goods inventories include newly manufactured clear brine fluids as well as used brines that are repurchased from certain customers for recycling