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Savings Plans, Pension Plans and Other Postretirement Employee Benefits (Schedule of Estimated Future Benefit Payments) (Details)
$ in Thousands
Dec. 31, 2015
USD ($)
Other Postretirement Benefit Plans, Defined Benefit [Member]  
2016 $ 4,182
2017 3,917
2018 3,634
2019 3,380
2020 3,176
2021 through 2025 12,584
Pension Plans, Defined Benefit [Member]  
2016 28,602
2017 28,250
2018 27,926
2019 27,673
2020 27,478
2021 through 2025 $ 132,612