Restructuring - (Restructuring Charges by Segment) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Restructuring Cost and Reserve [Line Items]
Restructuring	$ 20,424	[1]	$ 0	[1]	$ 0	[1]
2014 Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring	20,424
Enterprise and Service Provider division | 2014 Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring	14,092
Mobility Apps division | 2014 Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring	$ 6,332

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