BENEFIT PLANS - Weighted Average Asset Allocations (Details)	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Asset allocation	100.00%	100.00%
Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Asset allocation	44.00%	65.00%
Cash equivalents and other
Defined Benefit Plan Disclosure [Line Items]
Asset allocation	1.00%	6.00%
Mutual Fund - Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Asset allocation	28.00%	29.00%
Common collective trust- equities
Defined Benefit Plan Disclosure [Line Items]
Asset allocation	27.00%	0.00%