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Pension and Other Postretirement Benefits (Details 9)
$ in Thousands
Dec. 31, 2020
USD ($)
Pensions [Member]  
Defined Benefit Plan, Estimated Future Benefit Payments [Abstract]  
2021 $ 29,590
2021 29,531
2023 29,650
2024 29,505
2025 29,167
Years 2026-2030 146,049
Total 293,492
Other Postretirement Benefits [Member]  
Defined Benefit Plan, Estimated Future Benefit Payments [Abstract]  
2021 3,114
2021 2,888
2023 2,681
2024 2,499
2025 2,342
Years 2026-2030 9,782
Total $ 23,306