Employee Benefit Plans Stock Based Compensation (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Stock-based compensation expense	$ 5,298	$ 1,391	$ 5,717
Cost of Sales [Member]
Stock-based compensation expense	550	25	838
Research and Development Expense [Member]
Stock-based compensation expense	1,170	601	1,434
Selling, General and Administrative Expenses [Member]
Stock-based compensation expense	$ 3,578	$ 765	$ 3,445