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FAIR VALUE MEASUREMENTS (Narrative) (Details)
$ in Millions
3 Months Ended
Mar. 31, 2021
USD ($)
item
Dec. 31, 2020
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Minimum number of market participants | item 4,000  
Fair Value, Measurements, Nonrecurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value | $ $ 12.2 $ 12.7