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Retirement Benefit Plans (Expected Future Benefit Payments) (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Pension Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2018 $ 9,009
2019 8,630
2020 9,065
2021 9,792
2022 10,425
2023-2027 55,206
SERP [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2018 11,371
2019 130
2020 132
2021 132
2022 131
2023-2027 651
Other Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2018 354
2019 342
2020 328
2021 311
2022 292
2023-2027 $ 1,125