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Inventories
 9 Months Ended
Sep. 30, 2020
Inventory Disclosure [Abstract]  
Inventories Inventories
September 30,
2020		December 31,
2019
Raw materials$80,038 $63,644 
Work in progress56,921 56,065 
Finished goods46,218 58,527 
Spares and other26,105 25,035 
209,282 203,271 
Reduction to LIFO cost basis(35,409)(31,561)
Total inventories – net$173,873 $171,710