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14. Segment Reporting (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Segment Reporting Information [Line Items] |  |  |
Number Of Products And Services | 9,000 |  |
Net sales | $ 2,289,400 | $ 2,160,200 | $ 2,068,200
Interest expense | 23,962 | 23,014 | 23,380
Depreciation and amortization | 138,100 | 148,700 | 142,900
Segment profit | (103,341) | 119,250 | 55,718
Total assets | 5,611,068 | 4,273,012 |
Payments to Acquire Property, Plant, and Equipment | 129,825 | 111,332 | 141,436
Life Science [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 861,700 | 785,200 | 730,700
Interest expense | 7,200 | 7,000 | 6,900
Depreciation and amortization | 34,100 | 36,200 | 31,700
Segment profit | 28,700 | (9,900) | (19,100)
Total assets | 450,200 | 453,000 |
Payments to Acquire Property, Plant, and Equipment | 36,700 | 12,600 |
Clinical Diagnostics [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 1,411,800 | 1,360,800 | 1,323,300
Interest expense | 16,700 | 14,900 | 16,500
Depreciation and amortization | 72,000 | 80,200 | 80,500
Segment profit | (145,700) | 114,800 | 58,000
Total assets | 949,000 | 1,038,400 |
Payments to Acquire Property, Plant, and Equipment | 60,500 | 59,000 |
All Other Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 15,900 | 14,200 | 14,200
Interest expense | 100 | 0 | 0
Depreciation and amortization | 500 | 0 | 0
Segment profit | 200 | 1,400 | $ 900
Total assets | 5,900 | 4,800 |
Payments to Acquire Property, Plant, and Equipment | $ 500 | $ 0 |

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