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Benefit Plans (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Components of net periodic benefit cost [Abstract]        
Contribution made to pension and postretirement plans     $ 0  
Pension Benefits [Member]        
Components of net periodic benefit cost [Abstract]        
Service cost $ 0 $ 0 0 $ 0
Interest cost 304 222 910 666
Expected return on plan assets (672) (807) (2,013) (2,420)
Amortization of net gain 0 0 0 0
Amortization of prior service cost (credit) 0 0 0 0
Net periodic benefit (368) (585) (1,103) (1,754)
Other Postretirement Benefits [Member]        
Components of net periodic benefit cost [Abstract]        
Service cost 2 4 7 13
Interest cost 65 52 197 155
Expected return on plan assets (288) (333) (867) (999)
Amortization of net gain (115) (280) (343) (784)
Amortization of prior service cost (credit) 4 (78) 10 (235)
Net periodic benefit $ (332) $ (635) $ (996) $ (1,850)