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Inventories
 12 Months Ended
Dec. 31, 2021
Inventory Disclosure [Abstract]  
Inventories Inventories
Inventories consisted of the following at December 31:
(In thousands)20212020
Raw materials:  
Fluids Systems$119,242 $98,974 
Industrial Solutions4,939 6,315 
Total raw materials124,181 105,289 
Blended fluids systems components27,793 31,744 
Finished goods — mats
3,367 10,824 
Total inventories$155,341 $147,857 
Raw materials for the Fluids Systems segment consist primarily of barite, chemicals, and other additives that are consumed in the production of our fluids systems. Raw materials for the Industrial Solutions segment consist primarily of resins, chemicals, and other materials used to manufacture composite mats and cleaning products, as well as materials that are consumed in providing spill containment and other services to our customers. Our blended fluids systems components consist of base fluids systems that have been either mixed internally at our blending facilities or purchased from third-party vendors. These base fluids systems require raw materials to be added, as needed to meet specified customer requirements.
Fluids Systems segment cost of revenues for 2020 includes $10.3 million of total charges for inventory write-downs, primarily attributable to the reduction in carrying values of certain inventory to their net realizable value.