Details of Selected Balance Sheet Accounts Inventories (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Raw materials and subassemblies	$ 51,975	$ 54,168
Work-in-process	4,434	2,297
Finished goods	25,306	33,263
Reserve for excess and obsolete inventories	(26,393)	(32,555)
Total	$ 55,322	$ 57,173