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Benefit Plans - Components of NPBC (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Defined Benefit Pension Plans        
Defined Benefit Plan, Net Periodic Expense (Benefit)        
Interest cost $ 863 $ 681 $ 2,590 $ 1,888
Expected return on plan assets (826) (380) (2,479) (2,599)
Settlement loss 22 38 50 38
Net periodic expense (benefit) 59 339 161 (673)
Other Postretirement Benefits Plan        
Defined Benefit Plan, Net Periodic Expense (Benefit)        
Interest cost 6 5 18 13
Amortization of prior service credit (31) (53) (94) (158)
Amortization of net loss (1) 1 (2) 3
Net periodic expense (benefit) $ (26) $ (47) $ (78) $ (142)