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Employee Benefit Plans (Amounts Recognized in Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Pension Benefits [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Net actuarial loss (gain) $ 15,827 $ 16,847
Amount recognized in accumulated other comprehensive loss 15,827 16,847
Postretirement Benefit Plan [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Net actuarial loss (gain) (2,846) (3,089)
Prior service cost 173 187
Amount recognized in accumulated other comprehensive loss $ (2,673) $ (2,902)