Acquisitions Acquisitions (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Dec. 31, 2019
Business Acquisition [Line Items]
Goodwill	$ 233,211	$ 239,724
Midwest U.S.-based multi-site reference laboratory
Business Acquisition [Line Items]
Consideration transferred		$ 50,000
Intangible assets acquired	26,900
Tangible assets acquired	200
Goodwill	$ 22,900
Customer Relationships \| Midwest U.S.-based multi-site reference laboratory
Business Acquisition [Line Items]
Weighted average useful life of finite-lived intangible assets (in years)	13 years 9 months 18 days

Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Tangible Assets

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- Definition

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.

+ References

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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.

+ References

No definition available.

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- Definition

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

+ References

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- Definition

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

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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.

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