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Employee and Retiree Benefit Plans (Benefit Payments Expected to be Paid in Future Years) (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Pension Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2018 $ 37,266
2019 37,565
2020 38,606
2021 39,660
2022 39,908
2023-2027 207,633
Other Postretirement Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2018 5,754
2019 5,839
2020 5,994
2021 6,130
2022 6,171
2023-2027 $ 32,109