Summary of Significant Accounting Policies (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 11, 2012	Dec. 31, 2011
Cash Equivalents and Short-term Investments [Abstract]
Short-term investments	$ 14,178		$ 18,494
Trade Accounts Receivable [Abstract]
Past due threshold for individual collectability review (in days)	90 days
Property, Plant and Equipment [Abstract]
Estimated useful life (in years)	15
Initial term of long term evergreen contracts (in years)	10 years
Stock Split [Abstract]
Stock split	Board of Directors authorized a two-for-one stock split of the of the Company's outstanding common stock
Conversion ratio (in hundredths)	1
Common stock par value (in dollars per share)	$ 0.10	$ 0.10
Buildings [Member]
Property, Plant and Equipment [Abstract]
Annual rates of depreciation, minimum (in hundredths)	3.00%
Annual rates of depreciation, maximum (in hundredths)	6.67%
Machinery and equipment [Member]
Property, Plant and Equipment [Abstract]
Annual rates of depreciation, minimum (in hundredths)	6.67%
Annual rates of depreciation, maximum (in hundredths)	12.50%
Furniture and fixtures [Member]
Property, Plant and Equipment [Abstract]
Annual rates of depreciation, minimum (in hundredths)	8.00%
Annual rates of depreciation, maximum (in hundredths)	12.50%
Computer equipment and software-related assets [Member]
Property, Plant and Equipment [Abstract]
Annual rates of depreciation, minimum (in hundredths)	12.50%
Annual rates of depreciation, maximum (in hundredths)	25.00%