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Acquisitions (Details) (USD $) |  |  | 0 Months Ended
--- | --- | --- | ---
Sep. 30, 2013 | Dec. 31, 2012 | Jan. 12, 2012 ADAPTIX, Inc. [Member] patents countries
Business Acquisition [Line Items] |  |  |
Purchase price allocation, cash and cash equivalents |  |  | $ 10,000,000
Number of patents acquired |  |  | 230
Number of countries which have patents |  |  | 13
Cash payments to acquire businesses |  |  | 160,000,000
Intangible assets acquired - patents - amortization period |  |  | 10 years
Intangible assets acquired - patents, book basis |  |  | 150,000,000
Intangible assets acquired - patents, tax basis |  |  | 0
Intangible assets acquired - patents - difference |  |  | (150,000,000)
Estimated net operating loss carryforwards - ADAPTIX, book basis |  |  | 0
Estimated net operating loss carryforwards - ADAPTIX, tax basis |  |  | 63,860,000
Estimated net operating loss carryforwards - ADAPTIX, difference |  |  | 63,860,000
Net deferred tax liability - pretax |  |  | (86,140,000)
Estimated tax rate |  |  | 35.00%
Estimated net deferred tax liability | $ 17,748,000 | $ 27,831,000 | $ (30,149,000)

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