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Inventories (Tables)
 6 Months Ended
Jun. 30, 2017
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current
 
June 30, 2017
 
December 31, 2016
Raw materials
$
52,146

 
$
68,900

Work in progress
42,999

 
47,759

Finished goods
41,197

 
19,069

Spares and other
23,472

 
23,129

 
159,814

 
158,857

Reduction to LIFO cost basis
(28,327
)
 
(29,879
)
Total inventories
$
131,487

 
$
128,978