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11. Segment Information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Segment Reporting Information [Line Items]        
Net sales $ 506,102 $ 536,832 $ 978,923 $ 1,046,176
Income before income taxes 39,540 48,797 66,234 63,335
Life Science [Member]        
Segment Reporting Information [Line Items]        
Net sales 170,600 170,300 326,500 331,800
Income before income taxes (5,800) (7,200) (8,100) (13,900)
Clinical Diagnostics [Member]        
Segment Reporting Information [Line Items]        
Net sales 332,100 362,900 645,700 707,200
Income before income taxes 40,900 50,100 76,100 82,600
All Other Segments [Member]        
Segment Reporting Information [Line Items]        
Net sales 3,400 3,600 6,700 7,200
Income before income taxes $ 100 $ 100 $ (200) $ 100