Inventories (Schedule of Inventory) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Inventories [Abstract]
Finished goods	$ 65,756	$ 55,166
Work-in-process	12,186	11,332
Raw materials	21,380	19,485
Total inventories at current costs	99,322	85,983
Less: LIFO reserve	(8,527)	(9,027)
Inventory	$ 90,795	$ 76,956