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Business Acquisitions - Future Amortization Expense (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Acquired Intangible Assets, Amortization Expense, Fiscal Year Maturity [Abstract]    
For the year ended December 31, 2021 $ 9,359  
For the year ended December 31, 2022 8,967  
For the year ended December 31, 2023 6,942  
For the year ended December 31, 2024 5,155  
For the year ended December 31, 2025 3,835  
Thereafter 16,622  
Estimated future amortization expense $ 50,880 $ 46,955