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Benefit Plans (Components of net periodic benefit cost) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]        
Interest cost on benefit obligation   $ 388 $ 444 $ 485
Expected return on plan assets   (554) (546) (560)
Amortization of unrecognized actuarial net loss   242 279 313
Settlement loss   269 235 0
Net periodic benefit cost   $ 345 $ 412 $ 238
Scenario, Forecast [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost on benefit obligation $ 378      
Expected return on plan assets (452)      
Amortization of unrecognized actuarial net loss 214      
Net periodic benefit cost $ 140