Goodwill and Other Identifiable Intangible Assets (Details) (USD $)	3 Months Ended		9 Months Ended			9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Sep. 30, 2013 Minimum [Member]	Dec. 31, 2013 Minimum [Member]	Sep. 30, 2013 Maximum [Member]	Dec. 31, 2013 Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Patents, accumulated amortization	$ 103,273,000		$ 103,273,000		$ 69,850,000
Useful life of patents and patent rights							1 year		8 years
Weighted average useful life of patents and patent rights			7 years
Patent acquisition costs paid			10,416,000	64,960,000
Finite lived intangible asset acquired during the year, useful life						1 year		10 years
Patent acquisition costs included in accrued expenses			9,750,000	8,000,000
Accelerated amortization expense - up-front payments	0	152,000	593,000	534,000
Accelerated amortization expense (termination)			$ 1,630,000	$ 3,023,000