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Employee Benefit Plans Employee Benefit Plans 10 (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Pension Benefits  
Employee benefit plans  
2020 $ 7,910
2021 8,574
2022 9,263
2023 9,839
2024 10,441
Thereafter 60,621
Total 106,648
Post-Retirement Medical Benefits  
Employee benefit plans  
2020 526
2021 599
2022 642
2023 677
2024 652
Thereafter 2,607
Total $ 5,703