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Fair Value Measurements - Liability Measured on Recurring Basis, Unobservable Input Reconciliation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value, Recurring Basis, Unobservable Input Reconciliation, Liability, Gain (Loss), Statement of Income [Extensible List] Business Combination, Contingent Consideration Arrangements, Contingent Consideration Benefit Business Combination, Contingent Consideration Arrangements, Contingent Consideration Benefit
Contingent Consideration    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance $ 76,709 $ 82,236
Contingent consideration liability recorded as the result of acquisitions   10,517
Contingent consideration (benefit) (7,960) (304)
Contingent payments made (13,100) (15,740)
Effect of foreign exchange 101  
Ending balance $ 55,750 $ 76,709