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Employee Benefit Plans (Expected Benefit Payments) (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Pension Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2018 $ 14,200
2019 13,854
2020 16,206
2021 16,556
2022 18,518
2023 through 2027 95,544
Other Postretirement Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2018 625
2019 678
2020 715
2021 785
2022 844
2023 through 2027 $ 4,021