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Fair Value Measurements - Reconciliation of Liability for Future Consideration Payments (Details) - Contingent Consideration
$ in Thousands
6 Months Ended
Jun. 30, 2020
USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Balance at December 31, 2019 $ 2,081
New Acquisition 8,201
Changes in Fair Value 1,337
Contingent Consideration Payments (1,834)
Balance at June 30, 2020 $ 9,785