Operating Segments and Related Information (Details 3) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting, Asset Reconciling Item [Line Items]
Segment Reporting Information goodwill	$ 596,316	$ 553,335
Segment assets (accounts receivable, net and inventories)	719,190	675,263
Surveillance
Segment Reporting, Asset Reconciling Item [Line Items]
Segment Reporting Information goodwill	120,145	121,268
Segment assets (accounts receivable, net and inventories)	286,058	309,473
Instruments
Segment Reporting, Asset Reconciling Item [Line Items]
Segment Reporting Information goodwill	149,582	155,527
Segment assets (accounts receivable, net and inventories)	130,135	119,629
Security
Segment Reporting, Asset Reconciling Item [Line Items]
Segment Reporting Information goodwill	101,955	45,710
Segment assets (accounts receivable, net and inventories)	73,506	67,775
OEM & Emerging Markets
Segment Reporting, Asset Reconciling Item [Line Items]
Segment Reporting Information goodwill	69,973	72,687
Segment assets (accounts receivable, net and inventories)	105,509	59,182
Maritime
Segment Reporting, Asset Reconciling Item [Line Items]
Segment Reporting Information goodwill	106,549	109,980
Segment assets (accounts receivable, net and inventories)	93,925	79,053
Detection
Segment Reporting, Asset Reconciling Item [Line Items]
Segment Reporting Information goodwill	48,112	48,163
Segment assets (accounts receivable, net and inventories)	$ 30,057	$ 40,151