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Components of Net Periodic Benefit Cost - Net Periodic (Benefit) Increase Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Pension benefits        
Pension Plans, Postretirement and Other Employee Benefits [Line Items]        
Service cost $ 0 $ 0 $ 0 $ 0
Interest cost 289 302 578 604
Expected return on plan assets (778) (706) (1,556) (1,412)
Amortization of prior service cost 0 0 0 0
Amortization of the net loss (gain) 14 177 28 354
Net periodic (decrease) increase in benefit cost (475) (227) (950) (454)
Other post-retirement benefits        
Pension Plans, Postretirement and Other Employee Benefits [Line Items]        
Service cost 3 3 6 6
Interest cost 135 150 270 300
Expected return on plan assets 0 0 0 0
Amortization of prior service cost 0 0 0 0
Amortization of the net loss (gain) (530) (533) (1,060) (1,066)
Net periodic (decrease) increase in benefit cost $ (392) $ (380) $ (784) $ (760)