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4. Intangible Assets, Goodwill and Other (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2019 | Mar. 04, 2019 | Dec. 31, 2018
Goodwill [Line Items] |  |  |  |  |
Goodwill | $ 599,300 |  | $ 599,300 |  | $ 555,000
Accumulated impairment loss | (335,200) |  | (335,200) |  | (335,200)
Goodwill, net | 264,084 |  | 264,084 |  | 219,770
Goodwill, Acquired During Period | 28,700 | $ 15,600 | 44,300 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  |  | $ 200 |
Life Science [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill | 250,100 |  | 250,100 |  | 234,500
Accumulated impairment loss | (41,800) |  | (41,800) |  | (41,800)
Goodwill, net | 208,300 |  | 208,300 |  | 192,700
Goodwill, Acquired During Period |  |  | 15,600 |  |
Clinical Diagnostics [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill | 349,200 |  | 349,200 |  | 320,500
Accumulated impairment loss | (293,400) |  | (293,400) |  | (293,400)
Goodwill, net | $ 55,800 |  | 55,800 |  | $ 27,100
Goodwill, Acquired During Period |  |  | $ 28,700 |  |

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