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Benefit Plans (Fair values of our pension plan assets by asset category) (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]      
Fair values of the Corporation's pension plan assets $ 7,066 $ 6,582 $ 8,649
Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of the Corporation's pension plan assets 7,066 6,582  
Short-term investments [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of the Corporation's pension plan assets 103 235  
Short-term investments [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of the Corporation's pension plan assets 103 235  
Fixed income [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of the Corporation's pension plan assets 3,273 2,983  
Fixed income [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of the Corporation's pension plan assets 3,273 2,983  
Equity investments [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of the Corporation's pension plan assets 3,690 3,364  
Equity investments [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of the Corporation's pension plan assets $ 3,690 $ 3,364