Inventories, Net and Significant Suppliers (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2011
Inventory Disclosure [Abstract]
Raw materials	$ 20,831	$ 17,438
Components	19,949	20,978
Work in process	2,771	1,050
Finished goods	62,022	46,939
Reserve for excess and obsolete inventory	(1,994)	(2,024)	(2,307)	(3,447)
Inventories, net	$ 103,579	$ 84,381