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Inventories (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Inventory, Net |  |
Finished products and work in process | $ 223,019 | $ 199,919
Raw materials | 60,771 | 62,469
Inventory, Net | 283,790 | 262,388
Valued at lower of cost or market: |  |
LIFO basis | 177,632 | 162,315
FIFO or average cost basis | 106,158 | 100,073
Inventory, Net | $ 283,790 | $ 262,388

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