Restructuring (Restructuring Charges by Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Restructuring Cost and Reserve [Line Items]
Restructuring	$ 13,766	$ 3,124	$ 62,251	$ 17,285
2014 Restructuring Program [Member] | Enterprise and Service Provider Division [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring	(263)	3,122	1,747	11,093
2014 Restructuring Program [Member] | Mobility Apps [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring	0	2	50	6,192
2015 Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring	14,000		60,500
2015 Restructuring Program [Member] | Enterprise and Service Provider Division [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring	13,714	0	59,580	0
2015 Restructuring Program [Member] | Mobility Apps [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring	$ 315	$ 0	$ 874	$ 0