EMPLOYEE BENEFIT PLANS - Amounts Recognized in the Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Pension Benefits
Employee benefit plans
Net amount recognized	$ (63,321)	$ (57,889)
Pension Benefits | Noncurrent assets
Employee benefit plans
Net amount recognized	142,607	91,051
Pension Benefits | Accrued benefit costs
Employee benefit plans
Net amount recognized	0	0
Pension Benefits | Accrued benefit liability
Employee benefit plans
Net amount recognized	(84,651)	(85,547)
Pension Benefits | Regulatory liabilities
Employee benefit plans
Net amount recognized	(131,297)	(63,393)
Pension Benefits | Accumulated other comprehensive loss
Employee benefit plans
Net amount recognized	10,020	0
Other Benefits
Employee benefit plans
Net amount recognized	2,673	3,298
Other Benefits | Noncurrent assets
Employee benefit plans
Net amount recognized	46,085	28,634
Other Benefits | Accrued benefit costs
Employee benefit plans
Net amount recognized	(1)	(1)
Other Benefits | Accrued benefit liability
Employee benefit plans
Net amount recognized	0	0
Other Benefits | Regulatory liabilities
Employee benefit plans
Net amount recognized	(43,411)	(25,335)
Other Benefits | Accumulated other comprehensive loss
Employee benefit plans
Net amount recognized	$ 0	$ 0