Inventories (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Inventories
Raw materials	$ 31,603,000	$ 29,353,000
Finished goods	77,914,000	77,813,000
Total	109,517,000	107,166,000
Reserves for obsolete and slow-moving items	$ 1,900,000	$ 1,800,000