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Pension and Postretirement Benefit Plans (Schedule of Estimated Future Benefit Payments) (Details)
$ in Thousands
Dec. 31, 2016
USD ($)
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]  
2017 $ 14
2018 14
2019 14
2020 13
2021 12
2022-2026 $ 45