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SHORT-TERM AND LONG-TERM DEBT - Schedule of Short-Term Debt Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Short-term Debt [Line Items]    
Outstanding short-term debt $ 569,367 $ 353,072
Line of Credit [Member]    
Short-term Debt [Line Items]    
Outstanding short-term debt 24,722 23,072
Commercial Paper [Member]    
Short-term Debt [Line Items]    
Outstanding short-term debt $ 544,645 $ 330,000