Restructuring - Restructuring Reserve by Type of Cost (Details) (Restructuring Plan 2014 [Member], Infrastructure Solutions [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Restructuring Cost and Reserve [Line Items]
Other non-cash restructuring charges (reversals)	$ 1,505
Cash restructuring charges	2,033
Pre-tax charges related to restructuring	3,538
Cost of revenues [Member]
Restructuring Cost and Reserve [Line Items]
Other non-cash restructuring charges (reversals)	(166)
Cash restructuring charges	180
Pre-tax charges related to restructuring	14
Operating expenses [Member]
Restructuring Cost and Reserve [Line Items]
Other non-cash restructuring charges (reversals)	(1,021)
Cash restructuring charges	1,153
Pre-tax charges related to restructuring	132
Restructuring charges [Member]
Restructuring Cost and Reserve [Line Items]
Other non-cash restructuring charges (reversals)	0
Cash restructuring charges	658
Pre-tax charges related to restructuring	658
Other expense [Member]
Restructuring Cost and Reserve [Line Items]
Other non-cash restructuring charges (reversals)	2,692
Cash restructuring charges	42
Pre-tax charges related to restructuring	$ 2,734