Restructuring - (Restructuring Charges by Segment) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Restructuring Cost and Reserve [Line Items]
Restructuring	[1]	$ 100,411	$ 20,424	$ 0
Enterprise and Service Provider | 2014 Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring		1,724	14,092
Enterprise and Service Provider | 2015 Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring		67,548	0
Enterprise and Service Provider | 2015 Other Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring		27,680	0
Mobility Apps division | 2014 Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring		50	6,332
Mobility Apps division | 2015 Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring		1,357	0
Mobility Apps division | 2015 Other Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring		$ 2,052	$ 0

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