Restructuring Costs (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	$ 454		$ 3,547	$ 768	$ 11,361
Cost of Goods Sold
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	(1)		0	(1)	590
Selling General and Administrative Expense [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	454		3,547	768	11,361
Total COGS and SGA
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	453	$ 314	3,547	767	11,951
Surveillance
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	(45)		606	78	4,725
Instruments
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	497		2,672	684	6,196
OEM & Emerging Markets
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	0		109	2	276
Maritime
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	0		16	0	(125)
Detection
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	1		144	3	759
Other
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	$ 0		$ 0	$ 0	$ 120