PENSION PLAN - Plan Asset Allocations (Details) - Pension Plan	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	100.00%	100.00%
Cash
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	9.00%	4.00%
Fixed income
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	20.00%	23.00%
Alternative investments
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	19.00%	15.00%
Domestic equities
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	27.00%	33.00%
Foreign equities
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	24.00%	24.00%
Real estate investment trusts
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	1.00%	1.00%