Inventories (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Inventories [Abstract]
Raw materials and supplies	$ 132,698	$ 127,525
Work in process	35,302	30,498
Finished products	89,071	90,352
Inventory reserves	(45,021)	(43,452)
Total Inventory	$ 212,050	$ 204,923