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14. Segment Reporting (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number Of Products And Services |  |  |  |  |  |  |  |  | 9,000 |  |
Net sales | $ 621,300 | $ 534,100 | $ 504,700 | $ 500,100 | $ 571,500 | $ 508,700 | $ 516,800 | $ 471,200 | $ 2,160,153 | $ 2,068,172 | $ 2,019,441
Interest expense |  |  |  |  |  |  |  |  | 21,914 | 21,942 | 21,692
Depreciation and amortization |  |  |  |  |  |  |  |  | 148,700 | 142,900 | 131,800
Segment profit | 45,900 | $ 30,700 | $ 1,100 | $ 20,100 | (28,200) | $ 22,700 | $ 26,900 | $ 20,200 | 116,650 | 53,194 | 166,708
Total assets | 4,273,012 |  |  |  | 3,850,504 |  |  |  | 4,273,012 | 3,850,504 |
Payments to Acquire Property, Plant, and Equipment |  |  |  |  |  |  |  |  | 111,332 | 141,436 | 112,000
Life Science [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 785,200 | 730,700 | 695,000
Interest expense |  |  |  |  |  |  |  |  | 7,000 | 6,400 | 6,100
Depreciation and amortization |  |  |  |  |  |  |  |  | 36,200 | 31,700 | 30,700
Segment profit |  |  |  |  |  |  |  |  | (10,100) | (19,200) | (700)
Total assets | 453,000 |  |  |  | 380,800 |  |  |  | 453,000 | 380,800 |
Payments to Acquire Property, Plant, and Equipment |  |  |  |  |  |  |  |  | 12,600 | 14,300 |
Clinical Diagnostics [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 1,360,800 | 1,323,300 | 1,310,400
Interest expense |  |  |  |  |  |  |  |  | 14,900 | 15,500 | 15,400
Depreciation and amortization |  |  |  |  |  |  |  |  | 80,200 | 80,500 | 77,800
Segment profit |  |  |  |  |  |  |  |  | 112,500 | 57,000 | 152,400
Total assets | 1,038,400 |  |  |  | 909,100 |  |  |  | 1,038,400 | 909,100 |
Payments to Acquire Property, Plant, and Equipment |  |  |  |  |  |  |  |  | 59,000 | 67,100 |
All Other Segments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 14,200 | 14,200 | 14,000
Interest expense |  |  |  |  |  |  |  |  | 0 | 0 | 100
Depreciation and amortization |  |  |  |  |  |  |  |  | 0 | 0 | 100
Segment profit |  |  |  |  |  |  |  |  | 1,400 | 900 | $ 700
Total assets | $ 4,800 |  |  |  | $ 4,900 |  |  |  | 4,800 | 4,900 |
Payments to Acquire Property, Plant, and Equipment |  |  |  |  |  |  |  |  | $ 0 | $ 0 |

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