Retirement Benefit Plans (Schedule of Expected Benefit Payments) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013
Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
2014	$ 1,505
2015	1,530
2016	1,567
2017	1,665
2018	1,763
Years 2019 through 2023	9,327
Supplemental Employee Retirement Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
2014	44
2015	51
2016	101
2017	140
2018	241
Years 2019 through 2023	1,305
Hourly Employees’ Pension Plan | Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
2014	643
2015	634
2016	635
2017	644
2018	651
Years 2019 through 2023	3,231
Employees’ Retirement Plan | Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
2014	862
2015	896
2016	932
2017	1,021
2018	1,112
Years 2019 through 2023	$ 6,096