Goodwill and Other Identifiable Intangible Assets (Details) (USD $)	3 Months Ended		6 Months Ended			6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012	Jun. 30, 2013 Minimum [Member]	Dec. 31, 2013 Minimum [Member]	Jun. 30, 2013 Maximum [Member]	Dec. 31, 2013 Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Patents, accumulated amortization	$ 91,658,000		$ 91,658,000		$ 69,850,000
Useful life of patents and patent rights							1 year		9 years
Weighted average useful life of patents and patent rights			7 years
Patent acquisition costs paid			6,260,000	40,435,000
Finite lived intangible asset acquired during the year, useful life						1 year		10 years
Patent acquisition costs included in accrued expenses			8,508,000	10,200,000
Accelerated amortization expense - up-front payments	142,000	0	612,000	442,000
Accelerated amortization expense (termination)			$ 956,000