Restructuring Costs (Details) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	$ 327			$ 4,060	$ 1,095	$ 15,420
Cost of Goods Sold
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	0			0	0	590
Selling General and Administrative Expense [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	328			4,060	1,095	15,420
Total COGS and SGA
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	328	$ 453	$ 314	4,060	1,095	16,010
Surveillance
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	148			358	225	5,082
Instruments
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	223			3,674	907	9,868
OEM & Emerging Markets
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	(24)			0	(22)	278
Maritime
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	0			28	0	(97)
Detection
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	(19)			0	(15)	759
Other
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	$ 0			$ 0	$ 0	$ 120