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Employee Benefits - Future Payments (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Future payments under the Plan        
2021 $ 1,913      
2022 1,913      
2023 1,913      
2024 1,913      
2025 1,913      
Thereafter 10,181      
Total $ 19,746 $ 19,214 $ 18,927 $ 20,793