Restructuring (Restructuring Charges by Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Restructuring Cost and Reserve [Line Items]
Restructuring	$ 33,951	[1]	$ 9,650	[1]
2014 Restructuring Program [Member] | Enterprise and Service Provider Division [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring	834		5,880
2014 Restructuring Program [Member] | Mobility Apps [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring	50		3,770
2015 Restructuring Program [Member] | Enterprise and Service Provider Division [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring	32,755		0
2015 Restructuring Program [Member] | Mobility Apps [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring	$ 312		$ 0

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