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12. Segment Information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Segment Reporting Information [Line Items] |  |
Net sales | $ 499,672 | $ 486,277
Segment profit (loss) | 33,554 | 54,366
Life Science [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 156,300 | 154,800
Segment profit (loss) | (12,800) | (3,900)
Clinical Diagnostics [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 339,900 | 327,200
Segment profit (loss) | 36,100 | 45,700
All Other Segments [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 3,500 | 4,300
Segment profit (loss) | 100 | 900
Reportable Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Segment profit (loss) | $ 23,400 | $ 42,700

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