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Employee Benefit Plans (Components of Net Periodic Benefit Cost) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Pension Benefits [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Interest cost $ 1,430 $ 1,863
Expected return on plan assets (2,438) (2,218)
Amortization of unrecognized net (gain) loss 562 549
Total net periodic benefit cost $ (446) 194
Postretirement Benefit Plan [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Service cost   18
Interest cost   183
Amortization of prior service cost   14
Amortization of unrecognized net (gain) loss   (389)
Termination gain   (6,637)
Total net periodic benefit cost   $ (6,811)