Acquisitions (Schedule Of Identifiable Intangible Assets Purchased) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Podio [Member]
Total identifiable intangible assets purchased	$ 24,600
Podio [Member] | Customer Relationships [Member]
Identifiable finite-lived intangible assets purchased	3,900
Weighted average life (in years)	4 years
Podio [Member] | Core And Product Technologies [Member]
Identifiable finite-lived intangible assets purchased	20,700
Weighted average life (in years)	5 years
2012 Acquisition [Member]
Total identifiable intangible assets purchased	29,002
2012 Acquisition [Member] | Patented Technology [Member]
Identifiable indefinite-lived intangible assets purchased	790
2012 Acquisition [Member] | Customer Relationships [Member]
Identifiable finite-lived intangible assets purchased	2,100
Weighted average life (in years)	3 years
2012 Acquisition [Member] | Core And Product Technologies [Member]
Identifiable finite-lived intangible assets purchased	26,112
Weighted average life (in years)	4 years 7 months 6 days
Bytemobile [Member]
Total identifiable intangible assets purchased	251,400
Bytemobile [Member] | Patented Technology [Member]
Identifiable indefinite-lived intangible assets purchased	3,400
Bytemobile [Member] | Customer Relationships [Member]
Identifiable finite-lived intangible assets purchased	144,000
Weighted average life (in years)	8 years 9 months 18 days
Bytemobile [Member] | Core And Product Technologies [Member]
Identifiable finite-lived intangible assets purchased	98,000
Weighted average life (in years)	4 years 10 months 24 days
Bytemobile [Member] | Trade Names [Member]
Identifiable finite-lived intangible assets purchased	$ 6,000
Weighted average life (in years)	6 years