Patents Future Amortization Expense (Details) (USD $)	12 Months Ended
	Dec. 31, 2011
Future Amortization Expense [Abstract]
Future Amortization Expense, Year One	$ 5,115,000
Future Amortization Expense, Year Two	4,896,000
Future Amortization Expense, Year Three	4,707,000
Future Amortization Expense, Year Four	4,264,000
Future Amortization Expense, Year Five	$ 3,118,000