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Acquisition Acquisition Deferred Tax (Details) (USD $) | 12 Months Ended | 0 Months Ended
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Jan. 12, 2012 ADAPTIX, Inc. [Member]
Business Acquisition [Line Items] |  |  |  |
Book basis of intangible assets acquired - patents |  |  |  | $ 150,000,000
Tax basis of intangible assets acquired - patents |  |  |  | 0
Change from book and tax basis of intangible assets acquired - patents |  |  |  | (150,000,000)
Estimated net operating loss carryforwards - ADAPTIX |  |  |  | 0
Tax basis of estimated net operating loss carryforwards - ADAPTIX |  |  |  | 63,860,000
Change from book and tax basis of estimated net operating loss carryforwards - ADAPTIX |  |  |  | 63,860,000
Net deferred tax liability - pretax |  |  |  | (86,140,000)
Estimated tax rate | 35.00% | 35.00% | 34.00% | 35.00%
Estimated net deferred tax liability |  |  |  | $ (30,149,000)

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