Inventories (Details) (USD $)	Dec. 31, 2011	Dec. 31, 2010
Inventories [Abstract]
Raw materials and supplies	$ 198,579,000	$ 187,176,000
Finished goods	253,571,000	238,400,000
Total	452,150,000	425,576,000
Inventories, net of reserves	$ 3,600,000	$ 5,900,000