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Retirement Benefits - Future Benefit Payments (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Other Benefits  
Defined Benefit Plan and Other Postretirement Benefit Plans Table Text Block [Line Items]  
2016 $ 1,112
2017 1,094
2018 1,064
2019 1,038
2020 1,008
2021-2025 4,410
2016, without Medicare Part D subsidy 892
2017, without Medicare Part D subsidy 863
2018, without Medicare Part D subsidy 899
2019, without Medicare Part D subsidy 872
2020, without Medicare Part D subsidy 841
2021-2025, without Medicare Part D subsidy 3,704
Qualified Plan | Qualified Pension Benefits  
Defined Benefit Plan and Other Postretirement Benefit Plans Table Text Block [Line Items]  
2016 43,700
2017 45,100
2018 45,900
2019 47,100
2020 48,500
2021-2025 252,400
Nonqualified Plan | Qualified Pension Benefits  
Defined Benefit Plan and Other Postretirement Benefit Plans Table Text Block [Line Items]  
2016 6,249
2017 4,993
2018 1,887
2019 5,378
2020 3,678
2021-2025 $ 39,400