v3.26.1
ACCUMULATED OTHER COMPREHENSIVE LOSS (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Mar. 31, 2026
Dec. 31, 2025
Mar. 31, 2025
Dec. 31, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Defined benefit pension plan, tax benefits $ 300   $ 300     $ 300    
Accumulated other comprehensive loss included in noncontrolling interests 2,335,385 $ 2,225,132 2,335,385 $ 2,225,132 $ 2,307,591 2,318,441 $ 2,214,828 $ 2,155,097
Other nonoperating income (expense) 36 21 644 796        
Total Members’ Capital                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Unamortized defined benefit pension plan net actuarial losses 1,500   1,500     1,500    
Accumulated other comprehensive loss included in noncontrolling interests 848,995 $ 779,392 848,995 779,392 $ 842,049 843,245 $ 774,334 $ 749,436
AOCI Attributable to Noncontrolling Interest                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Accumulated other comprehensive loss included in noncontrolling interests $ (700)   (700)     $ (700)    
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent | Reclassification out of Accumulated Other Comprehensive Income                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Other nonoperating income (expense)     $ (8) $ (12)