Inventories (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Inventories [Abstract]
Raw materials and supplies	$ 124,013	$ 124,103
Work in process	24,536	29,358
Finished products	85,883	79,184
Inventory reserves	(33,612)	(38,879)
Total Inventory	$ 200,820	$ 193,766