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Employee Benefit Plans - Schedule of Estimated Future Benefit Payments (Details) - Postretirement Benefits Other than Pensions
$ in Thousands
Dec. 31, 2015
USD ($)
Estimated future benefit payments  
2016 $ 1,361
2017 1,430
2018 1,551
2019 1,718
2020 1,875
Years 2021 - 2025 $ 11,404