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EMPLOYEE BENEFIT PLANS - Assumptions (Details) - Pension Plan
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Weighted-average assumptions to determine benefit obligations    
Discount rate 4.27% 3.92%
Asset allocation assumption 100.00%  
Expected rate of return on plan assets 8.00% 8.00%
Weighted-average assumptions used to determine net periodic benefit cost    
Discount rate 3.92% 4.89%
Expected return on plan assets 8.00% 8.00%
Actual return on plan assets (2.00%) 5.40%
Domestic equity securities    
Weighted-average assumptions to determine benefit obligations    
Asset allocation assumption 70.00%  
Expected rate of return on plan assets 8.60%  
Foreign equity securities    
Weighted-average assumptions to determine benefit obligations    
Asset allocation assumption 10.00%  
Expected rate of return on plan assets 5.30%  
Fixed income securities/cash    
Weighted-average assumptions to determine benefit obligations    
Asset allocation assumption 20.00%  
Expected rate of return on plan assets 5.10%