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4. Intangible Assets, Goodwill and Other (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2019 | Jun. 30, 2019 | Mar. 04, 2019 | Dec. 31, 2018
Goodwill [Line Items] |  |  |  |
Goodwill |  | $ 570,600 |  | $ 555,000
Accumulated impairment loss |  | (335,200) |  | (335,200)
Goodwill, net |  | 235,401 |  | 219,770
Goodwill, Acquired During Period | $ 15,600 | 15,600 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  | $ 200 |
Life Science [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill |  | 250,100 |  | 234,500
Accumulated impairment loss |  | (41,800) |  | (41,800)
Goodwill, net |  | 208,300 |  | 192,700
Goodwill, Acquired During Period |  | 15,600 |  |
Clinical Diagnostics [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill |  | 320,500 |  | 320,500
Accumulated impairment loss |  | (293,400) |  | (293,400)
Goodwill, net |  | 27,100 |  | $ 27,100
Goodwill, Acquired During Period |  | $ 0 |  |

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