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EMPLOYEE BENEFIT PLANS - Weighted Average Asset Allocations (Details)
Dec. 31, 2018
Dec. 31, 2017
Plan's asset allocations by asset category    
Weighted-average asset allocations by asset category (as a percent) 100.00% 100.00%
Cash    
Plan's asset allocations by asset category    
Weighted-average asset allocations by asset category (as a percent) 4.70% 4.96%
Fixed income securities    
Plan's asset allocations by asset category    
Weighted-average asset allocations by asset category (as a percent) 12.98% 11.42%
Equity    
Plan's asset allocations by asset category    
Weighted-average asset allocations by asset category (as a percent) 64.26% 66.90%
Inflation Hedges/Real Assets    
Plan's asset allocations by asset category    
Weighted-average asset allocations by asset category (as a percent) 5.90% 5.82%
Hedged Strategies    
Plan's asset allocations by asset category    
Weighted-average asset allocations by asset category (as a percent) 12.16% 10.90%