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Employee Benefit Plans Expected benefits (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Pension Plans  
Defined Benefit Plan, Estimated Future Benefit Payments [Abstract]  
2018 $ 3,773
2019 3,858
2020 4,220
2021 4,424
2022 4,530
2023-2027 24,571
Defined Benefit Plan Expected Future Benefit Payments 45,376
Other Postretirement Benefit Plans  
Defined Benefit Plan, Estimated Future Benefit Payments [Abstract]  
2018 196
2019 184
2020 171
2021 159
2022 147
2023-2027 574
Defined Benefit Plan Expected Future Benefit Payments $ 1,431