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Pension and Other Post Retirement Benefit Plans - Schedule of Expected Future Benefit Payments (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Retirement Benefits [Abstract]  
2018 $ 5,586
2019 5,641
2020 5,609
2021 5,476
2022 5,377
After 2022 25,652
Total $ 53,341