Goodwill - Changes In Carrying Amounts (Details) $ in Thousands	6 Months Ended
Jun. 30, 2020 USD ($)
Changes in the carrying amounts of goodwill by segment
December 31, 2019	$ 301,321
Currency translation	12
March 31, 2020	301,333
Healthcare
Changes in the carrying amounts of goodwill by segment
December 31, 2019	276,014
Currency translation	12
March 31, 2020	276,026
Research
Changes in the carrying amounts of goodwill by segment
December 31, 2019	16,293
Currency translation	0
March 31, 2020	16,293
Corporate and Other
Changes in the carrying amounts of goodwill by segment
December 31, 2019	9,014
Currency translation	0
March 31, 2020	$ 9,014

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.

Reference 1: 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=77989000&loc=SL49117168-202975

Reference 2: 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

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- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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