Restructuring Costs (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	$ 314	$ 7,813
Total COGS and SGA
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	314	8,403
Surveillance
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	122	4,118
Instruments
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	187	3,524
OEM & Emerging Markets
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	2	167
Maritime
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	0	(141)
Security
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	0	0
Detection
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	3	615
Other
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	$ 0	$ 120