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Benefit Plans - Benefit Payments Representing the Company's Obligations to Employees (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Compensation And Retirement Disclosure [Abstract] |  |  |
2021 | $ 921 |  |
2022 | 913 |  |
2023 | 904 |  |
2024 | 994 |  |
2025 | 1,062 |  |
Thereafter | 28,736 |  |
Total benefit payments | $ 33,530 | $ 37,551 | $ 32,474

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