v3.26.1
Employee Postretirement Benefits - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Defined Benefit Plan Disclosure [Line Items]    
Net Periodic Benefit Cost (Income) $ (135) $ (603)
Pension Benefits (Pension Plan)    
Defined Benefit Plan Disclosure [Line Items]    
Service Cost 815 876
Interest Cost 4,306 4,326
Expected Return on Assets (6,241) (6,191)
Amortization of Prior Service Cost 0 0
Amortization of Net Actuarial Loss 712 335
Net Periodic Benefit Cost (Income) (408) (654)
Pension Benefits (ESSRP)    
Defined Benefit Plan Disclosure [Line Items]    
Service Cost 0 0
Interest Cost 458 474
Expected Return on Assets 0 0
Amortization of Prior Service Cost 0 0
Amortization of Net Actuarial Loss 0 0
Net Periodic Benefit Cost (Income) 458 474
Postretirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Service Cost 172 123
Interest Cost 457 403
Expected Return on Assets 0 0
Amortization of Prior Service Cost (916) (949)
Amortization of Net Actuarial Loss 102 0
Net Periodic Benefit Cost (Income) $ (185) $ (423)