PENSION AND OTHER POSTRETIREMENT BENEFITS - Schedule of Defined Benefit Plans Disclosure (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service Cost	$ 1,319	$ 1,591
Interest Cost	3,415	3,236
Expected Return on Plan Assets	(6,201)	(5,834)
Amortizations:
Prior Service Cost	18	25
Actuarial Loss	1,839	3,194
Net Periodic Benefit Cost	390	2,212
Capitalized Benefit Cost	(491)	(566)
Deferred Benefit Cost (Credit)	334	(316)
Total Net Periodic Benefit Expense	233	1,330
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service Cost	173	212
Interest Cost	502	475
Expected Return on Plan Assets	(1,692)	(1,436)
Amortizations:
Prior Service Cost	(156)	(156)
Actuarial Loss	35	273
Net Periodic Benefit Cost	(1,138)	(632)
Capitalized Benefit Cost	(60)	(106)
Deferred Benefit Cost (Credit)	532	337
Total Net Periodic Benefit Expense	$ (666)	$ (401)