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Inventories (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Inventory Disclosure [Abstract] |  |
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
Inventory gross | 143,498 | 157,534
Reduction to LIFO cost basis | (28,472) | (28,326)
Total inventories – net | $ 115,026 | $ 129,208

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