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Components of Net Periodic Benefit Cost - Net Periodic Benefit 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        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 141 $ 157 $ 282 $ 314
Interest cost 947 956 1,894 1,912
Expected return on plan assets (1,052) (969) (2,103) (1,939)
Net amortization of net (gain) loss 108 188 217 376
Net Periodic Benefit Cost 144 332 290 663
Postretirement Health Coverage        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 4 5 8 10
Interest cost 35 39 69 77
Net amortization of net (gain) loss (20) (13) (40) (26)
Net Periodic Benefit Cost $ 19 $ 31 $ 37 $ 61