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Benefit Plans Benefits Expected to be Paid in Next Five Years (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
Pension Plan [Member]  
Expected Future Benefit Payments [Abstract]  
2017 $ 6,356
2018 6,667
2019 6,799
2020 7,201
2021 7,556
2022 - 2026 41,653
Other Postretirement Benefit Plan [Member]  
Expected Future Benefit Payments [Abstract]  
2017 721
2018 752
2019 777
2020 795
2021 842
2022 - 2026 4,818
Maximum [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Estimated required and discretionary employer cash contributions in 2017 $ 7,500