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Goodwill and Other Identifiable Intangible Assets (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]          
Patents, accumulated amortization $ 46,850,000   $ 46,850,000   $ 36,331,000
Weighted average useful life of patents and patent rights     8 years    
Patent acquisition costs paid     40,435,000 1,805,000  
Accrued patent acquisition related payments   1,000,000   1,000,000  
Accelerated amortization expense - up-front payments $ 0 $ 1,063,000 $ 442,000 $ 3,446,000  
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     10 years    
Finite lived intangible asset acquired during the year, useful life     7 years