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12. Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Segment Reporting Information [Line Items]        
Net sales $ 525,321 $ 510,422 $ 1,024,993 $ 996,699
Segment profit (loss) 51,546 73,308 85,100 127,674
Life Science [Member]
        
Segment Reporting Information [Line Items]        
Net sales 170,400 162,400 326,600 317,200
Segment profit (loss) (7,600) 5,400 (20,400) 1,500
Clinical Diagnostics [Member]
        
Segment Reporting Information [Line Items]        
Net sales 351,500 344,000 691,400 671,200
Segment profit (loss) 48,500 55,400 84,600 101,200
All Other Segments [Member]
        
Segment Reporting Information [Line Items]        
Net sales 3,400 4,000 7,000 8,300
Segment profit (loss) 100 800 200 1,600
Reportable Segment [Member]
        
Segment Reporting Information [Line Items]        
Segment profit (loss) $ 41,000 $ 61,600 $ 64,400 $ 104,300