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Employee Benefit Plans, Benefit Payments Expected to be Paid (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Estimated Future Employer Contributions [Abstract]  
Estimated employer contributions in 2018 $ 2,300
Defined Benefit Pension Plans Combined [Member]  
Benefit Payments Expected to be Paid [Abstract]  
2018 1,714
2019 1,852
2020 1,865
2021 1,928
2022 2,007
2023 - 2027 $ 11,717