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SHORT-TERM BORROWINGS (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Short-term borrowings    
Amount outstanding $ 189,335 $ 144,667
Commercial Paper    
Short-term borrowings    
Maximum amount per commercial paper sublimit 500,000  
Amount outstanding $ 189,335 $ 144,667
Weighted average interest rate 1.95% 1.52%
Commercial Paper | Maximum    
Short-term borrowings    
Term of issuance 397 days  
Revolving Credit Agreement    
Short-term borrowings    
Available borrowing capacity $ 560,000  
Revolving Credit Agreement | Commercial Paper    
Short-term borrowings    
Available borrowing capacity $ 310,000