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RELATED PARTY TRANSACTIONS - Leases (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Jul. 31, 2023
Feb. 28, 2022
Related Party Transaction [Line Items]        
Right-of-use assets $ 249,019 $ 241,974    
Present value of lease obligations 295,239 289,605    
KAEC Lease Agreement | Related Party        
Related Party Transaction [Line Items]        
Lease initial term (in years)       25 years
Right-of-use assets 3,800 4,000    
Present value of lease obligations 6,700 6,500    
KAFD Lease Agreement | Related Party        
Related Party Transaction [Line Items]        
Lease initial term (in years)     6 years  
Right-of-use assets 1,500 1,700    
Present value of lease obligations $ 2,500 $ 2,400