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Benefit Plans - Estimated Future Pension Benefit Payments (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]  
2017 $ 8,274
2018 8,404
2019 9,320
2020 10,526
2021 10,937
2022-2026 53,456
Total $ 100,917