Inventory (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Components of Inventory
Raw materials	$ 11,413	$ 12,490
Work-in-process	426	160
Finished goods	32,881	27,917
Gross inventory	44,720	40,567
Less reserve for excess and obsolete inventory	(2,545)	(2,679)
Inventory, net	$ 42,175	$ 37,888