Acquisitions (Schedule Of Identifiable Intangible Assets Purchased) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012 Y
Podio [Member]
Identifiable intangible assets purchased	$ 24,600
Podio [Member] | Customer Relationships [Member]
Identifiable intangible assets purchased	3,900
Weighted Average Life (in years)	4.0
Podio [Member] | Core And Product Technologies [Member]
Identifiable intangible assets purchased	20,700
Weighted Average Life (in years)	5.0
2012 Acquisition [Member]
Identifiable intangible assets purchased	25,403
2012 Acquisition [Member] | Customer Relationships [Member]
Identifiable intangible assets purchased	2,100
Weighted Average Life (in years)	3.0
2012 Acquisition [Member] | Core And Product Technologies [Member]
Identifiable intangible assets purchased	$ 23,303
Weighted Average Life (in years)	4.5