RELATED PARTY TRANSACTIONS - Leases (Narrative) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Jul. 31, 2023	Feb. 28, 2022
Related Party Transaction [Line Items]
Right-of-use assets	$ 217,699	$ 221,508
Operating lease, liability	269,339	272,553
KAEC Lease Agreement | Related Party
Related Party Transaction [Line Items]
Lease initial term (in years)				25 years
Right-of-use assets	4,400	4,500
Operating lease, liability	5,800	5,700
KAFD Lease Agreement | Related Party
Related Party Transaction [Line Items]
Lease initial term (in years)			6 years
Right-of-use assets	2,200	2,300
Operating lease, liability	$ 2,400	$ 2,300