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Nonqualified Benefit Plans Future Benefit Payments (Details 14) - Unfunded Plan - Nonqualified Plan - Supplemental Employee Retirement Plan
$ in Thousands
Dec. 31, 2020
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
2021 $ 7,693
2022 6,957
2023 6,933
2024 7,299
2025 7,253
2026-2030 $ 33,938