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Retirement Benefit Plans (Schedule of Expected Benefit Payments) (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Supplemental Employee Retirement Plans, Defined Benefit  
Defined Benefit Plan Disclosure [Line Items]  
2018 $ 291
2019 294
2020 315
2021 317
2022 366
Years 2023 through 2027 2,355
Employees’ Retirement Plan | Pension Plans, Defined Benefit  
Defined Benefit Plan Disclosure [Line Items]  
2018 1,125
2019 1,146
2020 1,160
2021 1,220
2022 1,253
Years 2023 through 2027 $ 6,348