v3.26.3
EMPLOYEE BENEFIT PLANS - Postretirement Benefits Other than Pensions - Obligations (Details)
$ in Thousands
 9 Months Ended
Sep. 30, 2026
USD ($)
plan
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]  
Interest cost $ 335
Medical Benefit Plans  
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]  
Total postretirement and postemployment medical obligations at end of period $ 292
Postretirement Medical Benefit Plans  
Defined Contribution Plan Disclosure [Line Items]  
Threshold of unrecognized amount of actuarial gains and losses as a proportion of projected benefit obligation (as a percent) 10.00%
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]  
Postretirement medical benefit obligation at beginning of period $ 347
Interest cost 16
Benefit payments (net of contributions by participants) (170)
Total postretirement and postemployment medical obligations at end of period 193
Postemployment Medical Benefit Plans  
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]  
Total postretirement and postemployment medical obligations at end of period $ 99
Executive Benefit Restoration Plan  
Defined Contribution Plan Disclosure [Line Items]  
Threshold of unrecognized amount of actuarial gains and losses as a proportion of projected benefit obligation (as a percent) 10.00%
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]  
Postretirement medical benefit obligation at beginning of period $ 8,534
Interest cost 319
Total postretirement and postemployment medical obligations at end of period $ 9,228
Non-bargaining unit employees | Medical Benefit Plans  
Defined Contribution Plan Disclosure [Line Items]  
Number of plans | plan 3
Non-bargaining unit employees | Medical Benefit Plans | Maximum  
Defined Contribution Plan Disclosure [Line Items]  
Qualifying age 65 years
Non-bargaining unit employees | Postretirement Medical Benefit Plans  
Defined Contribution Plan Disclosure [Line Items]  
Number of plans | plan 2
Non-bargaining unit employees | Postretirement Medical Benefit Plans | Minimum  
Defined Contribution Plan Disclosure [Line Items]  
Qualifying age 55 years
Non-bargaining unit employees | Postemployment Medical Benefit Plans  
Defined Contribution Plan Disclosure [Line Items]  
Number of plans | plan 3