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Pension and Other Postretirement Benefits (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Pension Benefits    
Components of net periodic benefit cost    
Service cost $ 1,434 $ 2,007
Interest cost 2,943 2,234
Expected return on plan assets (1,962) (1,871)
Amortization of net loss (gain) 21 935
Amortization of prior service cost (credit) 46 69
Net periodic benefit cost 2,482 3,374
Postretirement Benefits    
Components of net periodic benefit cost    
Service cost 119 160
Interest cost 172 84
Expected return on plan assets 0 0
Amortization of net loss (gain) (201) (152)
Amortization of prior service cost (credit) (34) (34)
Net periodic benefit cost $ 56 $ 58