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Inventories (Tables)
9 Months Ended
Sep. 30, 2018
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current
September 30, 2018December 31, 2017
Raw materials $34,334 $48,502 
Work in progress 56,049 50,511 
Finished goods 29,063 35,430 
Spares and other 24,052 23,091 
143,498 157,534 
Reduction to LIFO cost basis (28,472)(28,326)
Total inventories – net $115,026 $129,208