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Retirement Benefit Plans (Schedule of Expected Benefit Payments) (Details)
$ in Thousands
Dec. 31, 2015
USD ($)
Pension Plans, Defined Benefit  
Defined Benefit Plan Disclosure [Line Items]  
2016 $ 1,561
2017 1,676
2018 1,780
2019 1,820
2020 1,862
Years 2021 through 2025 9,668
Supplemental Employee Retirement Plans, Defined Benefit  
Defined Benefit Plan Disclosure [Line Items]  
2016 108
2017 151
2018 261
2019 262
2020 264
Years 2021 through 2025 1,522
Hourly Employees’ Pension Plan | Pension Plans, Defined Benefit  
Defined Benefit Plan Disclosure [Line Items]  
2016 635
2017 640
2018 648
2019 655
2020 655
Years 2021 through 2025 3,156
Employees’ Retirement Plan | Pension Plans, Defined Benefit  
Defined Benefit Plan Disclosure [Line Items]  
2016 926
2017 1,036
2018 1,132
2019 1,165
2020 1,207
Years 2021 through 2025 $ 6,512