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11. Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Segment Reporting Information [Line Items]        
Net sales $ 510,422 $ 521,656 $ 996,699 $ 1,006,777
Segment profit (loss) 73,308 68,186 127,674 135,304
Life Science [Member]
        
Segment Reporting Information [Line Items]        
Net sales 162,400 169,900 317,200 324,400
Segment profit (loss) 5,400 10,000 1,500 13,100
Clinical Diagnostics [Member]
        
Segment Reporting Information [Line Items]        
Net sales 344,000 348,000 671,200 675,200
Segment profit (loss) 55,400 46,600 101,200 94,600
All Other Segments [Member]
        
Segment Reporting Information [Line Items]        
Net sales 4,000 3,700 8,300 7,200
Segment profit (loss) 800 500 1,600 700
Reportable Segment [Member]
        
Segment Reporting Information [Line Items]        
Segment profit (loss) $ 61,600 $ 57,100 $ 104,300 $ 108,400