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Employee Benefit Plans - Estimated future benefit payments (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Pensions  
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 1,139
2021 857
2022 941
2023 785
2024 782
2025-2029 5,427
Other post-retirement benefits  
Defined Benefit Plan Disclosure [Line Items]  
2020 1,592
2021 1,424
2022 1,295
2023 1,167
2024 1,040
2025-2029 $ 3,557