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Inventory (Schedule of Inventory) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Inventory [Abstract] |  |  |
Finished goods | $ 62,547 | $ 65,335 |
Work-in-process | 20,178 | 16,188 |
Raw materials | 19,492 | 21,855 |
Total inventories at current costs | 102,217 | 103,378 |
Less: LIFO reserve | (5,821) | (8,289) |
Inventory | 96,396 | 95,089 |
Excess of Book LIFO Over Tax LIFO | 5,046 | 11,697 |
Effect Of Inventory Liquidation On Cost Of Good Sold, Increase/(Decrease) | $ 115 | $ 6 | $ 1,128

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