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Employee Benefit Plans (Schedule of Assumptions Used to Calculate Benefit Obligations) (Details)
Dec. 31, 2018
Dec. 31, 2017
Pension Benefits | Cash Balance    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Discount rate 4.11% 3.49%
Pension Benefits | Excess Plan    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Discount rate 3.94% 3.27%
Other Postretirement Benefits    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Discount rate 412.00% 349.00%