Inventories (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Inventory [Line Items]
Raw materials and supplies	$ 86,324	$ 85,726
Work in process	42,031	40,945
Finished goods	82,629	69,830
Inventories, net	210,984	196,501
Inventory Valuation Reserves	$ 7,045	$ 4,078