Goodwill And Other Intangible Assets (Schedule Of Change In Goodwill) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014
Goodwill [Roll Forward]
Balance at January 1, 2014	$ 1,768,949
Additions	21,740	[1]
Other	(8,044)
Balance at September 30, 2014	1,782,645
Enterprise and Service Provider [Member]
Goodwill [Roll Forward]
Balance at January 1, 2014	1,402,156
Additions	21,740
Other	1,896	[2]
Balance at September 30, 2014	1,425,792
SaaS [Member]
Goodwill [Roll Forward]
Balance at January 1, 2014	366,793
Additions	0
Other	(9,940)	[3]
Balance at September 30, 2014	$ 356,853

[1] Amounts relate to 2014 acquisitions. See Note 4 for more information regarding the Company’s acquisitions.

[2] Amount relates to adjustments to the preliminary purchase price allocation associated with 2013 acquisitions.

[3] Amount primarily relates to foreign currency translation.