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Inventories (Schedule of Inventory) (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Inventory Disclosure [Abstract] |  |
Finished goods | $ 54,983 | $ 55,846
Contract assets | 24,862 | 25,320
Work-in-process | 7,721 | 4,059
Raw materials | 18,837 | 17,505
Total inventories at current costs | 106,403 | 102,730
Less: LIFO reserve | (5,351) | (5,187)
Inventory | $ 101,052 | $ 97,543

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