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Benefit Plans - Summary of Total Benefits Expected to be Paid Under Defined Benefit Pension Plans and Other Postretirement Benefit Plan (Details)
$ in Thousands
Dec. 31, 2015
USD ($)
Pension Benefits  
Benefit Plans  
2016 $ 15,589
2017 13,875
2018 12,999
2019 13,501
2020 13,162
2021-2025 69,927
Other Postretirement Benefits  
Benefit Plans  
2016 883
2017 932
2018 976
2019 1,043
2020 1,131
2021-2025 $ 6,625