v3.26.1
Employee Postretirement Benefits - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Defined Benefit Plan Disclosure [Line Items]        
Net Periodic Benefit Cost (Income) $ (134) $ (606) $ (269) $ (1,209)
Pension Benefits (Pension Plan)        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost 815 875 1,630 1,751
Interest Cost 4,307 4,326 8,613 8,652
Expected Return on Assets (6,242) (6,191) (12,483) (12,382)
Amortization of Prior Service Cost 0 0 0 0
Amortization of Net Actuarial Loss 712 336 1,424 671
Net Periodic Benefit Cost (Income) (408) (654) (816) (1,308)
Pension Benefits (ESSRP)        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost 0 0 0 0
Interest Cost 459 473 917 947
Expected Return on Assets 0 0 0 0
Amortization of Prior Service Cost 0 0 0 0
Amortization of Net Actuarial Loss 0 0 0 0
Net Periodic Benefit Cost (Income) 459 473 917 947
Postretirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost 173 122 345 245
Interest Cost 457 402 914 805
Expected Return on Assets 0 0 0 0
Amortization of Prior Service Cost (917) (949) (1,833) (1,898)
Amortization of Net Actuarial Loss 102 0 204 0
Net Periodic Benefit Cost (Income) $ (185) $ (425) $ (370) $ (848)