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Employee Benefit Plans, Benefit Payments Expected to be Paid (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Estimated Future Employer Contributions [Abstract]  
Estimated employer contributions in 2020 $ 2,300
Defined Benefit Pension Plans Combined [Member]  
Benefit Payments Expected to be Paid [Abstract]  
2020 1,827
2021 1,891
2022 1,964
2023 2,138
2024 2,208
2025 - 2029 $ 11,830