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Inventories (Tables)
12 Months Ended
Dec. 31, 2019
Inventory Disclosure [Abstract]  
Schedule of Inventories
At December 31, 2019 and December 31, 2018, inventories (in thousands) consisted of the following:
 
December 31, 2019
 
December 31, 2018
Supplies
$
47,277

 
$
41,453

Raw materials and work in process
41,167

 
68,474

Finished goods
35,988

 
52,160

Total inventories
$
124,432

 
$
162,087