Acquisitions and Divestiture (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Aug. 01, 2011	Mar. 31, 2011	Jan. 07, 2010
Business Acquisition [Line Items]
Business Acquisition, Cost of Acquired Entity, Purchase Price				$ 19,400,000	$ 15,400,000	$ 12,500,000
Business Acquisition, Purchase Price Allocation, Goodwill Amount				10,900,000	4,400,000	7,400,000
Business Acquisition, Purchase Price Allocation, Intangible Assets				13,300,000	9,900,000	4,500,000
Acquisition Contingent Consideration Payment	(325,000)	(7,750,000)	0
Retail Software Business Divestiture [Abstract]
Business Divestiture, Price of Divested Business, Cash Received		10,000,000
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax		4,400,000
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax		3,800,000
Trade Names [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Asset, Weighted Average Useful Life		15 years	7 years
Technology Member
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Asset, Weighted Average Useful Life		10 years	12 years
Customer Relationships
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Asset, Weighted Average Useful Life		18 years	30 years
Portion Of Current Year Price Related To Xray Inspection Solution Business Acquisition [Member]
Business Acquisition [Line Items]
Business Acquisition, Cost of Acquired Entity, Purchase Price					12,000,000
U.S. Operations Segment
Business Acquisition [Line Items]
Business Acquisition Allocation Of Goodwill Acquired Amongst Segments					1,900,000
Retail Software Business Divestiture [Abstract]
Disposal Group, Including Discontinued Operation, Goodwill		13,000,000
Swiss Operations Segment
Business Acquisition [Line Items]
Business Acquisition Allocation Of Goodwill Acquired Amongst Segments					$ 2,500,000