Acquisitions (Details) (USD $)	3 Months Ended
	Mar. 31, 2012 Y	Jan. 12, 2012 Number
Business Acquisition [Line Items]
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	46,565,000
Estimated net operating loss carryforwards - ADAPTIX, difference	46,565,000
Net deferred tax liability - pretax	(103,435,000)
Estimated tax rate	35.00%
Estimated net deferred tax liability	(36,202,000)
ADAPTIX, Inc. [Member]
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
Fair value of net tangible assets acquired		10,000,000
Intangible assets acquired - patents	150,000,000	150,000,000
Intangible assets acquired - patents - amortization period	10
Intangible assets acquired - patents - annual amortization	15,000,000
Goodwill		36,202,000
Deferred income tax liability		(36,202,000)
Intangible assets acquired - patents, tax basis	$ 0