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Benefit Plans Benefits Expected to be Paid in Next Five Years (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
Pension Plan [Member]  
Expected Future Benefit Payments [Abstract]  
2016 $ 5,879
2017 6,169
2018 6,546
2019 6,743
2020 7,191
2021 - 2025 42,464
Other Postretirement Benefit Plan [Member]  
Expected Future Benefit Payments [Abstract]  
2016 660
2017 697
2018 734
2019 767
2020 795
2021 - 2025 3,705
Maximum [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Estimated required and discretionary employer cash contributions in 2015 $ 8,200