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Pension and Other Postretirement Benefit Plans - Summary of Estimated Future Benefit Payments (Details) - Pension
$ in Thousands
Dec. 31, 2015
USD ($)
Defined Benefit Plan, Estimated Future Benefit Payments  
2016 $ 29,000
2017 29,000
2018 29,000
2019 28,000
2020 29,000
2021-2025 $ 150,000