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Employee Benefit Plans Employee Benefit Plans 10 (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Pension Benefits  
Employee benefit plans  
2019 $ 7,343
2020 7,934
2021 8,597
2022 9,283
2023 9,860
Thereafter 57,832
Total 100,849
Post-Retirement Medical Benefits  
Employee benefit plans  
2019 585
2020 633
2021 709
2022 749
2023 764
Thereafter 3,172
Total $ 6,612