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Deferred Acquisition Consideration (Tables)
9 Months Ended
Sep. 30, 2021
Business Combinations [Abstract]  
Schedule of Changes in Contingent Deferred Acquisition Consideration The following table presents changes in contingent deferred acquisition consideration, which is measured at fair value on a recurring basis using significant unobservable inputs, and a reconciliation to the amounts reported on the balance sheets as of September 30, 2021 and December 31, 2020:
September 30,December 31,
20212020
Beginning Balance of Contingent Payments$17,847 $65,792 
Payments(12,286)(66,235)
Redemption value adjustments (1)
9,535 2,520 
Additions (2)
61,110 15,717 
Other(501)53 
Ending balance of contingent payments$75,705 $17,847 
(1) Redemption value adjustments are fair value changes from the Company’s initial estimates of deferred acquisition payments. Redemption value adjustments are recorded within Office and general expenses on the Unaudited Condensed Consolidated Statements of Operations.
(2) Additions in 2021 represent deferred acquisition consideration acquired in connection with the acquisition of MDC.