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Employee Benefit Plans - Expected Benefit Payments (Details)
$ in Thousands
Dec. 31, 2015
USD ($)
Pension Benefits  
Defined Benefit Plan, Estimated Future Benefit Payments [Abstract]  
2016 $ 3,043
2017 3,204
2018 3,346
2019 3,543
2020 3,811
2021 - 2025 21,825
Postretirement Benefits  
Defined Benefit Plan, Estimated Future Benefit Payments [Abstract]  
2016 25
2017 27
2018 29
2019 32
2020 34
2021 - 2025 $ 211