Details of Selected Balance Sheet Accounts Inventories (Details) (USD $)	3 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Raw materials and subassemblies	$ 52,177,000	$ 49,421,000
Work-in-process	10,645,000	8,613,000
Finished goods	30,894,000	26,880,000
Reserve for excess and obsolete inventories	(32,312,000)	(14,239,000)
Total	61,404,000	70,675,000
Write-down of excess and obsolete inventory	18,200,000
Inventory written off through scrap expense	1,100,000
Inventory write-down to a lower of cost of market value	$ 1,900,000