Business Acquisitions and Divestitures Narrative (Details) (USD $)	12 Months Ended		0 Months Ended
	Dec. 31, 2012 acquisition	Jun. 30, 2013	Dec. 04, 2012 Verivue [Member]	Sep. 13, 2012 FastSoft [Member]	Mar. 06, 2012 Cotendo Acquisition [Member]	Feb. 07, 2012 Blaze Acquisition [Member]
Business Acquisition [Line Items]
Number of businesses acquired (in number of businesses)	4
Acquisition related costs	$ 5,800,000
Total purchase consideration			30,900,000	14,400,000	278,900,000	19,300,000
Contingent consideration, at fair value			1,200,000
Business acquisition purchase price allocation for goodwill			20,700,000	8,900,000	233,800,000	15,100,000
Business acquisition purchase price allocation for intangible assets			7,500,000	3,700,000	43,800,000	5,100,000
Weighted average amortization period (in years)			6 years 4 months 24 days	9 years	7 years 1 month 6 days	5 years 3 months 18 days
Goodwill, expected tax deductible amount			5,600,000	2,000,000	45,000,000	13,500,000
Note receivable		$ 25,000,000