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3. Intangible Assets, Goodwill and Other (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2017
Goodwill [Line Items] |  |  |
Goodwill |  | $ 553,200 | $ 559,300
Accumulated impairment loss |  | (53,200) | (53,200)
Goodwill, net |  | 500,022 | 506,069
Goodwill, Written off Related to Sale of Business Unit |  | (1,400) |
Currency fluctuations |  | (4,700) |
Life Science [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill |  | 234,500 | 234,700
Accumulated impairment loss |  | (35,900) | (35,900)
Goodwill, net |  | 198,600 | 198,800
Goodwill, Written off Related to Sale of Business Unit |  | 0 |
Currency fluctuations |  | (200) |
Clinical Diagnostics [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill |  | 318,700 | 324,600
Accumulated impairment loss |  | (17,300) | (17,300)
Goodwill, net |  | 301,400 | $ 307,300
Goodwill, Written off Related to Sale of Business Unit | $ (1,400) | (1,400) |
Currency fluctuations |  | $ (4,500) |

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