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Pensions and Other Postretirement Plans (Future Estimated Benefit Payments) (Details 4)
$ in Thousands
Dec. 31, 2020
USD ($)
Pension Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2021 $ 61,312
2022 61,461
2023 61,888
2024 62,496
2025 63,056
2026-2030 303,420
Supplemental Executive Retirement Plan (SERP) [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2021 6,576
2022 6,818
2023 7,014
2024 7,150
2025 7,229
2026-2030 36,132
Other Postretirement Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2021 797
2022 725
2023 624
2024 500
2025 398
2026-2030 $ 1,394