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Benefit Plans (Fair values of our pension plan assets by asset category) (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]      
Fair values of the Corporation's pension plan assets $ 8,649 $ 8,263 $ 8,352
Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of the Corporation's pension plan assets 8,649 8,263  
Short-term investments [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of the Corporation's pension plan assets 127 69  
Short-term investments [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of the Corporation's pension plan assets 127 69  
Fixed income [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of the Corporation's pension plan assets 3,750 3,851  
Fixed income [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of the Corporation's pension plan assets 3,750 3,851  
Equity investments [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of the Corporation's pension plan assets 4,772 4,343  
Equity investments [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair values of the Corporation's pension plan assets $ 4,772 $ 4,343