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Retirement Benefit Plans (Expected Future Benefit Payments) (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Pension Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 9,010
2021 9,797
2022 10,490
2023 10,488
2024 10,883
2025-2029 59,126
SERP [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2020 131
2021 134
2022 133
2023 132
2024 135
2025-2029 627
Other Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2020 314
2021 295
2022 274
2023 252
2024 229
2025-2029 $ 815