Business Acquisition (Details) (USD $)	3 Months Ended
	Mar. 31, 2012 Y
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Asset, Amount	$ 43,800,000
Completed Technology [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Asset, Amount	24,100,000
Customer Relationships [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Asset, Amount	13,400,000
Acquired Finite-lived Intangible Asset, Weighted Average Useful Life	9
Non-Compete Agreements [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Asset, Amount	3,900,000
Acquired Finite-lived Intangible Asset, Weighted Average Useful Life	6
Trademarks and Trade Names [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Asset, Amount	2,400,000
Acquired Finite-lived Intangible Asset, Weighted Average Useful Life	10
Blaze and Contendo [Member]
Business Acquisition [Line Items]
Business Combination, Acquisition Related Costs	4,500,000
Cotendo Acquisition [Member]
Business Acquisition [Line Items]
Weighted average cost of capital	15.00%
Total purchase consideration	278,877,000
Current assets, including cash and cash equivalents of $6,405	6,751,000
Business acquisition purchase price allocation for goodwill	241,646,000
Identifiable intangible assets	43,800,000
Acquired Finite-lived Intangible Asset, Weighted Average Useful Life	10
Trade receivables	2,920,000
Property and equipment	5,812,000
Indemnification assets	75,000
Indemnification assets	6,200,000
Deferred tax liabilities	(22,934,000)
Other liabilities assumed	(5,393,000)
Discount rate	.16
Tax rate for Intangible Assets	.385
Business Acquisition, Purchase Price Allocation, Goodwill, Expected Tax Deductible Amount	63,200,000
Cotendo Acquisition [Member] | Completed Technology [Member]
Business Acquisition [Line Items]
Royalty rate for intangible assets	.15
Acquired Finite-lived Intangible Asset, Weighted Average Useful Life	6
Cotendo Acquisition [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Asset, Weighted Average Useful Life	9
Cotendo Acquisition [Member] | Non-Compete Agreements [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Asset, Weighted Average Useful Life	6
Cotendo Acquisition [Member] | Trademarks and Trade Names [Member]
Business Acquisition [Line Items]
Royalty rate for intangible assets	.01
Acquired Finite-lived Intangible Asset, Weighted Average Useful Life	10
Blaze Acquisition [Member]
Business Acquisition [Line Items]
Total purchase consideration	19,300,000
Business acquisition purchase price allocation for goodwill	15,100,000
Identifiable intangible assets	$ 5,100,000
Acquired Finite-lived Intangible Asset, Weighted Average Useful Life	5.3
Business Acquisition, Purchase Price Allocation, Goodwill, Expected Tax Deductible Amount, Description	13.8