Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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Amount of liability recognized arising from contingent consideration in a business combination.

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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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Amount of liabilities assumed at the acquisition date.

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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.

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Acquisitions (Details) - USD ($) $ in Thousands	3 Months Ended
Acquisitions (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Business Acquisition [Line Items]
Goodwill	$ 242,586		$ 243,347
Reference Laboratory \| Switzerland
Business Acquisition [Line Items]
Consideration transferred	$ 5,500
Holdback and contingent payment		$ 1,100
Goodwill		1,800
Liabilities		600
Customer Relationships \| Reference Laboratory \| Switzerland
Business Acquisition [Line Items]
Intangible assets acquired		$ 4,300
Weighted average useful life of finite-lived intangible assets (in years)		9 years