Summary of Significant Accounting Policies Patents (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Net	$ 137,963,000	$ 130,305,000
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Weighted-Average Useful Life	10.7	10.7
Finite-Lived Patents, Gross	245,999,000	218,722,000
Finite-Lived Intangible Assets, Accumulated Amortization	(108,036,000)	(88,417,000)
Finite-Lived Intangible Assets, Net	137,963,000	130,305,000
Current - Future Amortization Expense	20,701,000
2013 - Future Amortization Expense	20,086,000
2014 - Future Amortization Expense	19,108,000
2015 - Future Amortization Expense	17,756,000
2016 - Future Amortization Expense	16,137,000
Finite-Lived Intangible Assets, Average Useful Life	15.0
Finite-Lived Intangible Assets, Amortization Expense	$ 19,600,000	$ 17,200,000	$ 14,400,000