Restructuring Costs Restructuring Costs (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Restructuring Cost and Reserve [Line Items]
Restructuring expenses									$ 1,361	$ 16,383	$ 25,832
Cost of Goods Sold
Restructuring Cost and Reserve [Line Items]
Restructuring expenses					$ 600				0	591	1,689
Selling General and Administrative Expense
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	$ 300	$ 300	$ 500	$ 300	1,000	$ 4,100	$ 3,500		1,361	16,383	25,832
Total COGS and SGA
Restructuring Cost and Reserve [Line Items]
Restructuring expenses					$ 16,974			$ 8,400	1,361	16,974	27,521
Surveillance
Restructuring Cost and Reserve [Line Items]
Restructuring expenses									226	5,232	5,359
Instruments
Restructuring Cost and Reserve [Line Items]
Restructuring expenses									1,170	10,998	15,541
OEM & Emerging Markets
Restructuring Cost and Reserve [Line Items]
Restructuring expenses									0	0	327
Maritime
Restructuring Cost and Reserve [Line Items]
Restructuring expenses									(22)	170	1,502
Security
Restructuring Cost and Reserve [Line Items]
Restructuring expenses									0	(90)	361
Detection
Restructuring Cost and Reserve [Line Items]
Restructuring expenses									(13)	544	4,222
Corporate Segment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expenses									$ 0	$ 120	$ 209