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11. Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Segment Reporting Information [Line Items]    
Net sales $ 509,344 $ 499,672
Income before income taxes 14,538 24,047
Life Science [Member]
   
Segment Reporting Information [Line Items]    
Net sales 161,500 156,300
Income before income taxes (6,600) (12,800)
Clinical Diagnostics [Member]
   
Segment Reporting Information [Line Items]    
Net sales 344,300 339,900
Income before income taxes 32,400 37,700
All Other Segments [Member]
   
Segment Reporting Information [Line Items]    
Net sales 3,500 3,500
Income before income taxes $ 100 $ 100