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Employee Benefit Plans - Expected Benefit Payments (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Pension  
Defined Benefit Plan Disclosure [Line Items]  
2018 $ 87,144
2019 89,291
2020 90,367
2021 91,580
2022 92,327
2023 — 2027 473,753
Postretirement  
Defined Benefit Plan Disclosure [Line Items]  
2018 3,163
2019 3,035
2020 3,127
2021 3,014
2022 2,836
2023 — 2027 $ 11,296