Goodwill and Other Identifiable Intangible Assets (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Patents, accumulated amortization	$ 51,762,000		$ 51,762,000		$ 36,331,000
Weighted average useful life of patents and patent rights			8 years
Patent acquisition costs paid			64,960,000	2,805,000
Accrued patent acquisition related payments	8,000,000	825,000	8,000,000	825,000
Accelerated amortization expense - up-front payments	152,000	730,000	534,000	4,069,000
Accelerated amortization expense (termination)			$ 3,023,000	$ 101,000
Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Useful life of patents and patent rights			1 year
Finite lived intangible asset acquired during the year, useful life			1 year
Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Useful life of patents and patent rights			9 years
Finite lived intangible asset acquired during the year, useful life			8 years