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4. Intangible Assets, Goodwill and Other (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
Goodwill [Line Items] |  |  |
Goodwill | $ 626,700 | $ 626,700 | $ 599,300
Accumulated impairment loss | (335,200) | (335,200) | (335,200)
Goodwill, net | 291,504 | 291,504 | 264,131
Goodwill, Acquired During Period | 29,400 | 29,400 |
Goodwill, Other Increase (Decrease) |  | 2,000 |
Life Science [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 277,500 | 277,500 | 250,100
Accumulated impairment loss | (41,800) | (41,800) | (41,800)
Goodwill, net | 235,700 | 235,700 | 208,300
Goodwill, Acquired During Period | 29,400 | 29,400 |
Goodwill, Other Increase (Decrease) | 2,000 | 2,000 |
Clinical Diagnostics [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 349,200 | 349,200 | 349,200
Accumulated impairment loss | (293,400) | (293,400) | (293,400)
Goodwill, net | $ 55,800 | 55,800 | $ 55,800
Goodwill, Acquired During Period |  | 0 |
Goodwill, Other Increase (Decrease) |  | $ 0 |

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)(1)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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