Acquisitions (Details) (ADAPTIX, Inc. [Member], USD $)	0 Months Ended	6 Months Ended
	Jan. 12, 2012 Number	Jun. 30, 2012
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	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	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)