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Pension and Postretirement Benefits - Composition of Net Periodic Pension Plan and Postretirement Plan Costs (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Pension Benefits [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Interest cost $ 140 $ 116
Expected return on plan assets (241) (267)
Amortization of net losses 57  
Net periodic benefit plan (benefit) cost (44) (151)
Postretirement Benefits [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Interest cost 2 3
Amortization of prior service credits (1) (1)
Amortization of net losses (1) 1
Net periodic benefit plan (benefit) cost $ 3