Inventory (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Components of Inventory
Raw materials	$ 11,493	$ 12,490
Work-in-process	375	160
Finished goods	31,676	27,917
Gross inventory	43,544	40,567
Inventory, net	40,977	37,888
Inventory Valuation Reserves	$ (2,567)	$ (2,679)