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Employee Benefit Plans (Components of Net Periodic Benefit Cost) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Pension Benefits [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Interest cost $ 466 $ 427
Expected return on plan assets (555) (711)
Amortization of unrecognized net (gain) loss 137 113
Total net periodic benefit cost 48 (171)
Postretirement Benefit Plan [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Service cost 5 8
Interest cost 45 45
Amortization of unrecognized prior service cost 4 4
Amortization of unrecognized net (gain) loss (97) (70)
Total net periodic benefit cost $ (43) $ (13)