EMPLOYEE BENEFIT PLANS - Amounts Recognized in the Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Pension Benefits
Employee benefit plans
Net amount recognized	$ (57,889)	$ (64,231)
Pension Benefits | Noncurrent assets
Employee benefit plans
Net amount recognized	91,051	32,848
Pension Benefits | Accrued benefit costs
Employee benefit plans
Net amount recognized	0	(307)
Pension Benefits | Accrued benefit liability
Employee benefit plans
Net amount recognized	(85,547)	(80,772)
Pension Benefits | Regulatory assets
Employee benefit plans
Net amount recognized	0	0
Pension Benefits | Other regulatory liabilities
Employee benefit plans
Net amount recognized	(63,393)	(16,000)
Other Benefits
Employee benefit plans
Net amount recognized	3,298	(38)
Other Benefits | Noncurrent assets
Employee benefit plans
Net amount recognized	28,634	42,934
Other Benefits | Accrued benefit costs
Employee benefit plans
Net amount recognized	(1)	(465)
Other Benefits | Accrued benefit liability
Employee benefit plans
Net amount recognized	0	0
Other Benefits | Regulatory assets
Employee benefit plans
Net amount recognized	0	171
Other Benefits | Other regulatory liabilities
Employee benefit plans
Net amount recognized	$ (25,335)	$ (42,678)