Inventories (Details) (USD $)	Dec. 31, 2011	Dec. 31, 2010
Inventories [Abstract]
Raw materials	$ 28,610,000	$ 24,178,000
Finished goods	89,738,000	77,515,000
Total	118,348,000	101,693,000
Reserves for obsolete and slow-moving items	$ 2,200,000	$ 1,300,000