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Fair Value Measurements - Reconciliation of Liability for Future Consideration Payments (Details) - Contingent Consideration
$ in Thousands
6 Months Ended
Jun. 30, 2021
USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Balance at December 31, 2020 $ 12,896
Changes in Fair Value 1,130
Contingent Consideration Payments (2,252)
Balance at June 30, 2021 $ 11,774