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Assets and Liabilities Measured at Fair Value - Contingent Consideration Roll Forward (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of the period $ 25,825 $ 22,681
Changes in fair value during the period, included in the Consolidated Statements of Operations 471 931
Balance, end of the period $ 26,296 $ 23,612