Restructuring (Restructuring Charges by Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Restructuring Cost and Reserve [Line Items]
Restructuring	$ 14,534	$ 4,511	$ 48,485	$ 14,161
2014 Restructuring Program [Member] | Enterprise and Service Provider Division [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring	1,176	2,091	2,010	7,971
2014 Restructuring Program [Member] | Mobility Apps [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring	0	2,420	50	6,190
2015 Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring	13,400		46,400
2015 Restructuring Program [Member] | Enterprise and Service Provider Division [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring	13,111	0	45,866	0
2015 Restructuring Program [Member] | Mobility Apps [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring	$ 247	$ 0	$ 559	$ 0