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Pension and Other Postretirement Benefits - Estimated Contributions and Estimated Future Retirement Benefit Payments (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Pension Benefits  
Pension and Other Postretirement Benefits  
Estimated contribution $ 20,600
Estimated Future Retirement Benefit Payments, Year ending December 31,  
2020 23,308
2021 22,808
2022 23,017
2023 26,913
2024 27,333
Thereafter 144,095
Total 267,474
Postretirement Benefits  
Estimated Future Retirement Benefit Payments, Year ending December 31,  
2020 807
2021 981
2022 1,108
2023 1,165
2024 1,290
Thereafter 6,989
Total $ 12,340