Annual report pursuant to Section 13 and 15(d)

Pension and Other Postretirement Benefits - Projected Benefit Obligation and Accumulated Benefit Obligation in Excess of Plan Assets (Details)

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Pension and Other Postretirement Benefits - Projected Benefit Obligation and Accumulated Benefit Obligation in Excess of Plan Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Projected benefit obligation in excess of Pension Plan assets:      
Projected benefit obligation $ 10,553 $ 8,177  
Fair value of Pension Plan assets 14,201 11,650 $ 10,713
Plan assets in excess of accumulated benefit obligation:      
Accumulated benefit obligation 6,417 5,277  
Fair value of Pension Plan assets $ 14,201 $ 11,650