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Pension Plans - Qualified Plan - Expected Future Benefit Payments (Details) - Pension Plan [Member] - Qualified Plan [Member]
$ in Thousands
Dec. 31, 2020
USD ($)
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]  
2021 $ 7,518
2022 5,778
2023 4,827
2024 4,837
2025 6,559
2026 - 2030 $ 28,698