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Acquisitions (Details) (USD $)
9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Aug. 01, 2011
Mar. 31, 2011
Acquisitions (Textuals) [Abstract]        
Business Acquisition, Cost of Acquired Entity, Purchase Price     $ 19,400,000 $ 15,400,000
Business Acquisition, Contingent Consideration, Potential Cash Payment     2,400,000  
Goodwill     10,900,000 4,400,000
Business Acquisition, Purchase Price Allocation, Intangible Assets     13,300,000 9,900,000
Payments for Previous Acquisition 0 7,750,000    
Portion of Current Year $15.4MM Price Related to X-ray Inspection Solution Business Acquisition [Member]
       
Acquisitions (Textuals) [Abstract]        
Business Acquisition, Cost of Acquired Entity, Purchase Price       12,000,000
U.S. Operations Segment [Member]
       
Acquisitions (Textuals) [Abstract]        
Goodwill       1,900,000
Swiss Operations Segment [Member]
       
Acquisitions (Textuals) [Abstract]        
Goodwill       $ 2,500,000