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Inventories
 9 Months Ended
Sep. 30, 2020
Inventory Disclosure [Abstract]  
Inventories INVENTORIES
Components of inventories as of September 30, 2020 and December 31, 2019 are as follows: 
 September 30, 2020December 31, 2019
 (In Thousands)
Finished goods$70,452 $70,135 
Raw materials3,744 4,125 
Parts and supplies32,340 47,793 
Work in progress6,484 14,457 
Total inventories
$113,020 $136,510 
Finished goods inventories include newly manufactured clear brine fluids as well as used brines that are repurchased from certain customers for recycling