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Fair Value Measurement - Changes in Contingent Consideration and Other (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance as of beginning of period $ 13,730 $ 16,975
Settlements (13,730) (3,500)
Realized and unrealized gains (losses), net 0 (4,975)
Balance as of end of period $ 0 $ 8,500