Employee Benefit Plans Stock Based Compensation (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Stock-based compensation expense	$ 1,391,000	$ 5,717,000	$ 6,158,000
Cost of Sales [Member]
Stock-based compensation expense	25,000	838,000	816,000
Research and Development Expense [Member]
Stock-based compensation expense	601,000	1,434,000	1,303,000
Selling, General and Administrative Expenses [Member]
Stock-based compensation expense	765,000	3,445,000	4,039,000
Restructuring Charges [Member]
Stock-based compensation expense	$ 0	$ 0	$ 0