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Inventories (Tables)
6 Months Ended
Jun. 30, 2019
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current
June 30,
2019
December 31,
2018
Raw materials$46,109 $55,002 
Work in progress54,030 46,728 
Finished goods45,333 39,368 
Spares and other24,313 24,555 
169,785 165,653 
Reduction to LIFO cost basis(31,551)(28,471)
Total inventories – net$138,234 $137,182