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Employee Benefit Plans (Components of Net Periodic Benefit Cost) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Pension Benefits [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Interest cost $ 358 $ 466 $ 1,074 $ 1,398
Expected return on plan assets (609) (555) (1,828) (1,665)
Amortization of unrecognized net (gain) loss 140 138 421 412
Total net periodic benefit cost $ (111) 49 $ (333) 145
Postretirement Benefit Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost   5   15
Interest cost   46   136
Amortization of prior service cost   4   11
Amortization of unrecognized net (gain) loss   (98)   (292)
Total net periodic benefit cost   $ (43)   $ (130)