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Employee Benefit Plans - Expected benefit payments (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Expected employer contributions  
Expected contributions $ 3,600
Expected benefit payments  
2019 1,647
2020 1,759
2021 2,020
2022 2,131
2023 1,973
2024-2027 11,790
Total $ 21,320