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Employee Benefit Plans Employee Benefit Plans 10 (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Pension Benefits  
Employee benefit plans  
2018 $ 6,737
2019 7,281
2020 7,900
2021 8,516
2022 9,196
Thereafter 54,429
Total 94,059
Post-Retirement Medical Benefits  
Employee benefit plans  
2018 554
2019 574
2020 632
2021 720
2022 749
Thereafter 3,365
Total $ 6,594