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Inventories
 9 Months Ended
Sep. 30, 2019
Inventory Disclosure [Abstract]  
Inventories Inventories
Inventories consist of the following:
 
 
September 30,
2019
 
December 31,
2018
Raw materials
$
47,789

 
$
46,147

Finished products
106,561

 
119,407

Spare parts
15,940

 
14,649

 
$
170,290

 
$
180,203



Inventory reserves for excess quantities, obsolescence or shelf-life expiration as of September 30, 2019 and December 31, 2018 were $14.8 million and $14.3 million, respectively.