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Discontinued Operations (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2012
Discontinued operations    
Income from discontinued operations $ 4,055,000 $ 4,812,000
Pre-tax gain on sale of assets previously held for sale   1,400,000
Sales 0 0
Metrology
   
Discontinued operations    
Deferred pre-tax gain recognized on sale of business in China $ 5,400,000 $ 5,400,000