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EMPLOYEE BENEFIT PLANS - Assumptions (Details)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]      
Discount rate (as a percent) 3.04% 4.10% 3.47%
Weighted-average assumptions used to determine net periodic cost      
Discount rate (as a percent) 4.10% 3.47% 3.98%
Expected long-term return on plan assets (as a percent) 7.00% 7.00% 7.00%