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11. Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Segment Reporting Information [Line Items]        
Net sales $ 498,697 $ 516,514 $ 1,495,396 $ 1,523,291
Segment profit (loss) 64,232 73,922 191,906 209,226
Life Science [Member]
        
Segment Reporting Information [Line Items]        
Net sales 167,000 171,500 484,200 495,900
Segment profit (loss) 6,400 12,500 7,800 25,600
Clinical Diagnostics [Member]
        
Segment Reporting Information [Line Items]        
Net sales 328,400 341,300 999,600 1,016,500
Segment profit (loss) 47,000 49,500 148,100 144,100
All Other Segments [Member]
        
Segment Reporting Information [Line Items]        
Net sales 3,300 3,700 11,600 10,900
Segment profit (loss) 0 500 1,900 1,100
Reportable Segment [Member]
        
Segment Reporting Information [Line Items]        
Segment profit (loss) $ 53,400 $ 62,500 $ 157,800 $ 170,900