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Employee Benefit Plans (Components of Net Periodic Benefit Cost) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Pension Benefits [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Interest cost $ 358 $ 466 $ 716 $ 932
Expected return on plan assets (609) (555) (1,218) (1,110)
Amortization of unrecognized net (gain) loss 140 137 280 274
Total net periodic benefit cost $ (111) 48 $ (222) 96
Postretirement Benefit Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost   5   10
Interest cost   45   90
Amortization of prior service cost   4   8
Amortization of unrecognized net (gain) loss   (97)   (194)
Total net periodic benefit cost   $ (43)   $ (86)