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SHORT-TERM BORROWINGS (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Short-term borrowings    
Amount outstanding $ 252,323 $ 204,145
Commercial Paper    
Short-term borrowings    
Amount outstanding $ 252,323 $ 204,145
Weighted average interest rate 1.88% 2.65%
Commercial Paper | Maximum    
Short-term borrowings    
Maximum amount per commercial paper sublimit $ 500,000  
Term of issuance 397 days  
2018 Revolving Credit Agreement    
Short-term borrowings    
Available borrowing capacity $ 397,000  
2018 Revolving Credit Agreement | Commercial Paper    
Short-term borrowings    
Available borrowing capacity $ 247,000