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Inventories
 9 Months Ended
Sep. 30, 2021
Inventory Disclosure [Abstract]  
Inventories INVENTORIES
Components of inventories as of September 30, 2021 and December 31, 2020 are as follows: 
 September 30, 2021December 31, 2020
 (In Thousands)
Finished goods$62,510 $68,121 
Raw materials3,604 2,910 
Parts and supplies4,524 4,001 
Work in progress1,648 1,626 
Total inventories
$72,286 $76,658 
Finished goods inventories include newly manufactured clear brine fluids as well as used brines that are repurchased from certain customers for recycling