Restructuring Costs (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		3 Months Ended			9 Months Ended	3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 Total COGS and SGA	Jun. 30, 2014 Total COGS and SGA	Mar. 31, 2014 Total COGS and SGA	Sep. 30, 2014 Total COGS and SGA	Sep. 30, 2014 Surveillance	Sep. 30, 2014 Surveillance	Sep. 30, 2014 Instruments	Sep. 30, 2014 Instruments	Sep. 30, 2014 OEM & Emerging Markets	Sep. 30, 2014 OEM & Emerging Markets	Sep. 30, 2014 Maritime	Sep. 30, 2014 Maritime	Sep. 30, 2014 Security	Sep. 30, 2014 Security	Sep. 30, 2014 Detection	Sep. 30, 2014 Detection	Sep. 30, 2014 Other	Sep. 30, 2014 Other
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	$ 4,060	$ 0	$ 15,420	$ 0	$ 4,060	$ 3,547	$ 8,403	$ 16,010	$ 358	$ 5,082	$ 3,674	$ 9,868	$ 0	$ 278	$ 28	$ (97)	$ 0	$ 0	$ 0	$ 759	$ 0	$ 120