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Inventories (Schedule of Inventory) (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Inventories [Abstract]    
Finished goods $ 54,659 $ 62,547
Work-in-process 20,418 20,178
Raw materials 20,683 19,492
Total inventories at current costs 95,760 102,217
Less: LIFO reserve (4,379) (5,821)
Inventory $ 91,381 $ 96,396