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SHORT TERM INVESTMENTS (Narrative) (Details)
12 Months Ended
Dec. 31, 2018
USD ($)
OTTI loss, held-to-maturity investments $ 0
OTTI loss, available-for-sale investments $ 0
Maximum [Member]  
Derivative, Remaining Maturity 98 days
Derivative, Fixed Interest Rate 4.48%
Minimum [Member]  
Derivative, Remaining Maturity 30 days
Derivative, Fixed Interest Rate 3.90%