Goodwill And Other Intangible Assets (Schedule Of Change In Goodwill) (Details) $ in Thousands		6 Months Ended
		Jun. 30, 2015 USD ($)
Goodwill [Roll Forward]
Balance at January 1, 2015		$ 1,796,851
Additions	[1]	161,594
Other		(423)
Balance at June 30, 2015		1,958,022
Enterprise and Service Provider [Member]
Goodwill [Roll Forward]
Balance at January 1, 2015		1,434,369
Additions		61,639
Other	[2]	(423)
Balance at June 30, 2015		1,495,585
Mobility Apps [Member]
Goodwill [Roll Forward]
Balance at January 1, 2015		362,482
Additions		99,955
Other		0
Balance at June 30, 2015		$ 462,437

[1] Amounts relate to 2015 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 2014 acquisitions.