Inventories (Details) (USD $)	Mar. 31, 2012	Dec. 31, 2011
Inventories [Abstract]
Raw materials and supplies	$ 197,935,000	$ 198,579,000
Finished goods	278,317,000	253,571,000
Total	476,252,000	452,150,000
Inventories, net of reserves	$ 3,300,000	$ 3,600,000