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Assets and Liabilities Measured at Fair Value - Level 3 Rollforward (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of the period $ 22,681 $ 19,700
Changes in fair value during the period, included in the Consolidated Statements of Operations 931 1,383
Adjustment for contingent consideration paid in stock 0 (316)
Balance, end of the period $ 23,612 $ 20,767