Details of Selected Balance Sheet Accounts Inventories (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Raw materials and subassemblies	$ 40,970	$ 54,168
Work-in-process	11,879	2,297
Finished goods	26,977	33,263
Reserve for excess and obsolete inventories	(24,450)	(32,555)
Total	$ 55,376	$ 57,173