Inventories (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Inventory [Line Items]
Raw materials and supplies	$ 89,551	$ 93,014
Work in process	42,336	42,996
Finished goods	95,640	76,994
Inventories, net	227,527	213,004
Inventory Valuation Reserves	$ 4,806	$ 6,556