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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 |  |

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