EMPLOYEE BENEFIT PLANS - Amounts Recognized in the Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Pension Benefits
Employee benefit plans
Net amount recognized	$ (64,231)	$ (60,511)
Pension Benefits | Noncurrent assets
Employee benefit plans
Net amount recognized	32,848	17,002
Pension Benefits | Accrued benefit costs
Employee benefit plans
Net amount recognized	(307)	(282)
Pension Benefits | Accrued benefit liability
Employee benefit plans
Net amount recognized	(80,772)	(94,010)
Pension Benefits | Regulatory assets
Employee benefit plans
Net amount recognized	0	16,779
Pension Benefits | Other regulatory liabilities
Employee benefit plans
Net amount recognized	(16,000)	0
Other Benefits
Employee benefit plans
Net amount recognized	(38)	(623)
Other Benefits | Noncurrent assets
Employee benefit plans
Net amount recognized	42,934	26,966
Other Benefits | Accrued benefit costs
Employee benefit plans
Net amount recognized	(465)	(1,124)
Other Benefits | Accrued benefit liability
Employee benefit plans
Net amount recognized	0	0
Other Benefits | Regulatory assets
Employee benefit plans
Net amount recognized	171	829
Other Benefits | Other regulatory liabilities
Employee benefit plans
Net amount recognized	$ (42,678)	$ (27,294)