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Inventories
 3 Months Ended
Mar. 31, 2021
Inventory Disclosure [Abstract]  
Inventories INVENTORIES
Components of inventories as of March 31, 2021 and December 31, 2020 are as follows: 
 March 31, 2021December 31, 2020
 (In Thousands)
Finished goods$64,484 $68,121 
Raw materials3,288 2,910 
Parts and supplies5,018 4,001 
Work in progress1,670 1,626 
Total inventories
$74,460 $76,658 
Finished goods inventories include newly manufactured clear brine fluids as well as used brines that are repurchased from certain customers for recycling