Business Acquisitions (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Lorex Technology Inc. [Member]
Business Acquisition [Line Items]
Finite-lived intangible asset	$ 15,100
Traficon International NV
Business Acquisition [Line Items]
Finite-lived intangible asset	20,102
Marine & Remote Sensing Solutions [Member]
Business Acquisition [Line Items]
Finite-lived intangible asset	375
DigitalOptics Charlotte [Member]
Business Acquisition [Line Items]
Finite-lived intangible asset	2,520
Patented Technology [Member] | Traficon International NV
Business Acquisition [Line Items]
Finite-lived intangible asset	5,951
Finite-Lived Intangible Asset, Useful Life	10 years
Patented Technology [Member] | DigitalOptics Charlotte [Member]
Business Acquisition [Line Items]
Finite-lived intangible asset	2,000
Finite-Lived Intangible Asset, Useful Life	12 years
Order or Production Backlog [Member] | Traficon International NV
Business Acquisition [Line Items]
Finite-lived intangible asset	1,852
Finite-Lived Intangible Asset, Useful Life	1 year 6 months
Order or Production Backlog [Member] | DigitalOptics Charlotte [Member]
Business Acquisition [Line Items]
Finite-lived intangible asset	150
Finite-Lived Intangible Asset, Useful Life	2 years
Trade Names [Member] | Lorex Technology Inc. [Member]
Business Acquisition [Line Items]
Indefinite-lived intangible asset	6,800
Customer relationships | Lorex Technology Inc. [Member]
Business Acquisition [Line Items]
Finite-lived intangible asset	8,300
Finite-Lived Intangible Asset, Useful Life	7 years
Customer relationships | Traficon International NV
Business Acquisition [Line Items]
Finite-lived intangible asset	12,299
Finite-Lived Intangible Asset, Useful Life	10 years
Customer relationships | DigitalOptics Charlotte [Member]
Business Acquisition [Line Items]
Finite-lived intangible asset	$ 370
Finite-Lived Intangible Asset, Useful Life	2 years 6 months