Restructuring (Restructuring Charges by Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Restructuring Cost and Reserve [Line Items]
Restructuring	$ 9,650	[1]	$ 0	[1]
2014 Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring	9,650
2014 Restructuring Program [Member] | Enterprise and Service Provider Division [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring	5,880
2014 Restructuring Program [Member] | SaaS Division [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring	$ 3,770

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