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Pension Plans (Components of Pension Cost) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 0 $ 0 $ 0 $ 0
Interest cost 313 358 782 1,082
Expected return on plan assets (264) (325) (792) (976)
Amortization of net (gain)/loss 109 153 485 511
Net periodic pension cost 158 186 475 617
Pension Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0 0 0 0
Interest cost 283 303 693 917
Expected return on plan assets (264) (325) (792) (976)
Amortization of net (gain)/loss 106 194 474 634
Net periodic pension cost 125 172 375 575
SERP        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0 0 0 0
Interest cost 30 55 89 165
Expected return on plan assets 0 0 0 0
Amortization of net (gain)/loss 3 (41) 11 (123)
Net periodic pension cost $ 33 $ 14 $ 100 $ 42