Restructuring (Restructuring Charges by Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Restructuring Cost and Reserve [Line Items]
Restructuring	$ 4,511	[1]	$ 0	[1]	$ 14,161	[1]	$ 0	[1]
2014 Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring	4,511				14,161
2014 Restructuring Program [Member] | Enterprise and Service Provider Division [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring	2,091				7,971
2014 Restructuring Program [Member] | SaaS Division [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring	$ 2,420				$ 6,190

[1] Represents expenses presented to management on a consolidated basis only and not allocated to the operating segments.