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Defined Pension Plans (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Defined Benefit Plan Disclosure [Line Items]        
Pension period     30 years  
Defined Benefit Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Pension costs $ 1,027 $ 1,186 $ 2,056 $ 2,365
Unfunded Supplemental Executive Retirement Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Pension costs $ 145 $ 196 $ 290 $ 391