Restructuring Costs (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]
Restructuring expenses									$ 1,431	$ 1,361	$ 16,383
Cost of Goods Sold
Restructuring Cost and Reserve [Line Items]
Restructuring expenses								$ 300	0	0	591
Selling General and Administrative Expense
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	$ 200	$ 900	$ 100	$ 200	$ 300	$ 300	$ 500		664	1,361	16,383
Total COGS and SGA
Restructuring Cost and Reserve [Line Items]
Restructuring expenses									1,431	1,361	16,974
Surveillance
Restructuring Cost and Reserve [Line Items]
Restructuring expenses									107	226	5,232
Instruments
Restructuring Cost and Reserve [Line Items]
Restructuring expenses									492	1,170	10,998
Security
Restructuring Cost and Reserve [Line Items]
Restructuring expenses									0	0	0
OEM & Emerging Markets [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expenses									65	(22)	170
Maritime [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expenses									0	0	(90)
Detection
Restructuring Cost and Reserve [Line Items]
Restructuring expenses									0	(13)	544
Corporate Segment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expenses									0	$ 0	$ 120
Restructuring Plan [Domain] | Total COGS and SGA
Restructuring Cost and Reserve [Line Items]
Restructuring expenses									$ 664