Acquisitions (Schedule of Identifiable Intangible Assets Purchased) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Podio [Member]
Total	$ 24,600
Podio [Member] | Customer Relationships [Member]
Identifiable intangible assets purchased	3,900
Weighted average life	4 years
Podio [Member] | Core And Product Technologies [Member]
Identifiable intangible assets purchased	20,700
Weighted average life	5 years
Bytemobile [Member]
Total	248,900
Bytemobile [Member] | In-process R&D [Member]
Acquired Indefinite-lived Intangible Asset, Amount	900
Bytemobile [Member] | Trade Names [Member]
Identifiable intangible assets purchased	6,000
Weighted average life	6 years
Bytemobile [Member] | Customer Relationships [Member]
Identifiable intangible assets purchased	141,500
Weighted average life	9 years
Bytemobile [Member] | Core And Product Technologies [Member]
Identifiable intangible assets purchased	100,500
Weighted average life	4 years 9 months 18 days
Acquisition 2012 [Member]
Total	29,002
Acquisition 2012 [Member] | In-process R&D [Member]
Acquired Indefinite-lived Intangible Asset, Amount	0
Acquisition 2012 [Member] | Customer Relationships [Member]
Identifiable intangible assets purchased	2,100
Weighted average life	3 years
Acquisition 2012 [Member] | Core And Product Technologies [Member]
Identifiable intangible assets purchased	$ 26,902
Weighted average life	4 years 6 months