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Goodwill and Other Intangible Assets - Future Aggregate Amortization Expense (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Estimated future aggregate amortization expense    
2021 (excluding the nine months ended September 30, 2021) $ 966  
2022 3,867  
2023 3,867  
2024 3,630  
2025 3,440  
Thereafter 7,051  
Intangible assets subject to amortization, Net Book Value $ 22,821 $ 26,207