EMPLOYEE BENEFIT PLANS - Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Net gains (losses)	$ 11,262	$ (1,587)	$ (1,514)
Amortization of losses (gains)	1,154	861	449
Postretirement
Defined Benefit Plan Disclosure [Line Items]
Net gains (losses)	40	(207)	(285)
Amortization of losses (gains)	$ 20	$ 8	$ 0