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Benefit Plans Benefits Expected to be Paid in Next Five Years (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Pension Plan [Member]  
Expected Future Benefit Payments [Abstract]  
2020 $ 13,930
2021 14,358
2022 14,626
2023 15,187
2024 15,604
2025 - 2028 86,971
Other Postretirement Benefits Plan [Member]  
Expected Future Benefit Payments [Abstract]  
2020 1,336
2021 1,447
2022 1,513
2023 1,600
2024 1,648
2025 - 2028 8,908
Maximum [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Estimated required and discretionary employer cash contributions in 2017 $ 8,404