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Acquisitions - Schedule of Contingent and Non-Contingent Consideration Fair Value (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Business Acquisition, Contingent Consideration [Line Items] |  |
Accruals and other current liabilities | $ 6,900 | $ 2,884
Accruals and other current liabilities | 5,911 | 685
Series of Individually Immaterial Business Acquisitions |  |
Business Acquisition, Contingent Consideration [Line Items] |  |
Accruals and other current liabilities | 6,900 | 2,884
Other liabilities | 2,133 | 1,415
Contingent consideration from acquisitions | 9,033 | 4,299
Accruals and other current liabilities | 5,911 | 685
Other liabilities | 5,876 | 1,774
Non-contingent consideration from acquisitions | $ 11,787 | $ 2,459

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