EMPLOYEE BENEFIT PLANS - Schedule of Asset Allocations (Details)	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Asset Allocations	100.00%	100.00%
Target Asset Allocations	100.00%	100.00%
Equity securities and diversified growth funds
Defined Benefit Plan Disclosure [Line Items]
Asset Allocations	19.20%	73.50%
Target Asset Allocations	27.50%	65.00%
Debt securities
Defined Benefit Plan Disclosure [Line Items]
Asset Allocations	79.20%	25.70%
Target Asset Allocations	72.50%	35.00%
Other
Defined Benefit Plan Disclosure [Line Items]
Asset Allocations	1.50%	0.80%
Target Asset Allocations	0.00%	0.00%
Minimum | Equity securities and diversified growth funds
Defined Benefit Plan Disclosure [Line Items]
Target Asset Allocations	25.00%
Minimum | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Target Asset Allocations	70.00%
Maximum | Equity securities and diversified growth funds
Defined Benefit Plan Disclosure [Line Items]
Target Asset Allocations	30.00%
Maximum | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Target Asset Allocations	75.00%