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Retirement Plans, Estimated Future Benefit Payments (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Pension Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 19,659
2021 19,755
2022 20,729
2023 20,392
2024 20,710
2025-2029 91,264
Postretirement Plan  
Defined Benefit Plan Disclosure [Line Items]  
2020 218
2021 213
2022 208
2023 202
2024 196
2025-2029 $ 867