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EMPLOYEE BENEFIT PLANS - Assumptions (Details) - Defined benefit pension plan
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Asset allocation assumptions    
Active management premium percentage 1.50%  
Asset allocation assumption 100.00%  
Actual return on plan assets (as a percent) 19.20% (6.70%)
Equity securities    
Asset allocation assumptions    
Asset allocation assumption 62.00%  
Fixed income securities    
Asset allocation assumptions    
Asset allocation assumption 33.00%  
Real estate    
Asset allocation assumptions    
Asset allocation assumption 5.00%