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Pension and Other Postretirement Benefits - Cash Flow (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
Pension Plans, Defined Benefit [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Minimum Cash Contributions, Next Fiscal Year $ 10,000
2021 12,581
2022 12,237
2023 13,096
2024 12,979
2025 13,622
2025 to 2029 72,965
Other Postretirement Benefit Plans Defined Benefit [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Minimum Cash Contributions, Next Fiscal Year 300
Domestic plan [Member] | Pension Plans, Defined Benefit [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Minimum Cash Contributions, Next Fiscal Year 5,900
2021 5,923
2022 5,298
2023 6,072
2024 6,234
2025 6,228
2025 to 2029 30,443
Domestic plan [Member] | Other Postretirement Benefit Plans Defined Benefit [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2021 286
2022 278
2023 265
2024 245
2025 226
2025 to 2029 923
Foreign [Member] | Pension Plans, Defined Benefit [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Minimum Cash Contributions, Next Fiscal Year 4,100
2021 6,658
2022 6,939
2023 7,024
2024 6,745
2025 7,394
2025 to 2029 $ 42,522