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Fair Value Measurements - Summary of Fair Value of Level 3 Subsidiary Unit Awards and Contingent Consideration (Details) - Contingent Consideration Liability From Acquisitions - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning of period balance $ 0 $ 2,027 $ 0 $ 2,595
Changes in fair value included in earnings 0 (1,721) 0 (2,289)
End of period balance $ 0 $ 306 $ 0 $ 306