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4. Intangible Assets, Goodwill and Other (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019
Goodwill [Line Items] |  |
Goodwill | $ 599,300 | $ 599,300
Accumulated impairment loss | (335,200) | (335,200)
Goodwill, net | 264,131 | 264,131
Goodwill, Acquired During Period | 0 |
Life Science [Member] |  |
Goodwill [Line Items] |  |
Goodwill | 250,100 | 250,100
Accumulated impairment loss | (41,800) | (41,800)
Goodwill, net | 208,300 | 208,300
Goodwill, Acquired During Period | 0 |
Clinical Diagnostics [Member] |  |
Goodwill [Line Items] |  |
Goodwill | 349,200 | 349,200
Accumulated impairment loss | (293,400) | (293,400)
Goodwill, net | 55,800 | $ 55,800
Goodwill, Acquired During Period | $ 0 |

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