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SHORT-TERM BORROWINGS (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Short-term borrowings    
Amount outstanding $ 164,723 $ 252,323
Commercial Paper    
Short-term borrowings    
Amount outstanding $ 164,723 $ 252,323
Weighted average interest rate 1.83% 1.88%
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 $ 285,000  
2018 Revolving Credit Agreement | Commercial Paper    
Short-term borrowings    
Available borrowing capacity $ 285,000