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Acquisitions (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2020
Business Acquisition [Line Items] |  |  |
Goodwill |  | $ 239,724 | $ 238,100
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 |  |

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