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Pension and Other Postretirement Benefit Plans (Schedule of Expected Benefit Payments) (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 44,619
2021 43,297
2022 43,438
2023 42,905
2024 42,837
Year 2025-2029 200,271
Other Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2020 31,833
2021 29,935
2022 29,302
2023 28,664
2024 27,881
Year 2025-2029 $ 134,541