Inventories, Net and Significant Suppliers (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012	Dec. 31, 2011
Schedule of Inventories, Net
Raw materials	$ 23,683	$ 17,438
Components	16,733	20,978
Work in process	3,250	1,050
Finished goods	58,306	46,939
Reserve for excess and obsolete inventory	(1,922)	(2,024)	(3,037)	(3,447)
Inventories, net	$ 100,050	$ 84,381