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Employee Benefit Plans (Components of Net Periodic Benefit Cost) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Termination gain $ (6,637)  
Pension Benefits [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Interest cost 1,863 $ 1,712
Expected return on plan assets (2,218) (2,845)
Amortization of unrecognized net (gain) loss 549 451
Total net periodic benefit cost 194 (682)
Postretirement Benefit Plan [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Service cost 18 33
Interest cost 183 186
Amortization of prior service cost 14 14
Amortization of unrecognized net (gain) loss (389) (282)
Termination gain (6,637)  
Total net periodic benefit cost $ (6,811) $ (49)