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Pension and Other Postretirement Benefit Plans (Schedule of Expected Benefit Payments) (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2018 $ 44,778
2019 44,035
2020 43,117
2021 42,124
2022 42,644
Year 2023-2027 206,682
Other Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2018 37,464
2019 37,163
2020 37,071
2021 36,862
2022 36,228
Year 2023-2027 $ 172,756